Robust empirical Bayes approach for Markov chain modeling of air pollution index
This study proposes a robust empirical Bayes method, which incorporates a method of smoothing the zero frequencies in t he count matrix, contributing to an improved estimation of the transition probability matrix. The robustness of the empirical Bayesian estimation is investigated based on Bayes risk. The transition probability matrices estimated based on the robust empirical Bayes method for the hourly API data coll ected from seven monitoring stations in Malaysia for the period 2012 to 2014 are used for determining the air pollution characteristics such as the mean residence time, the steady-state probability and the mea...
Source: Journal of Environmental Health Science and Engineering - January 26, 2021 Category: Environmental Health Source Type: research

Environmental impact assessment of salt harvesting from the salt lakes
This study provides readers and authorities with environmen tal impacts of salt harvesting from unique saline Lake of Iran, presents effective management options such as stopping any unlicensed and unrestrained salt harvesting activities on the USL bed, avoiding deep excavations, minimizing accumulation of piles to prevent the diffusion of salt particles etc . and also specialized the Folchi matrix for application in similar projects. (Source: Journal of Environmental Health Science and Engineering)
Source: Journal of Environmental Health Science and Engineering - January 26, 2021 Category: Environmental Health Source Type: research

Learning and memory disorders related to hippocampal inflammation following exposure to air pollution
In this study, we divided 48 adult NMRI male mice into control group VS. three exposure groups. Mice were exposed to 300-350 μg/m3 DEPs for 2, 5, and 7  h daily for 12 weeks. The Morris Water Maze (MWM) and Elevated Plus Maze device were used to examine anxiety, spatial memory and learning, respectively. The mRNAs expression of pro-inflammatory cytokines, N-methyl-D-aspartate (NMDA) receptor subunits, and glutaminase were studied in hippocampus ( HI) by real-time RT-PCR. Besides, malondialdehyde (MDA) tests were used to determine the state of oxidative stress. After 5 and 7 h. of DEPs exposure, mRNA ...
Source: Journal of Environmental Health Science and Engineering - January 22, 2021 Category: Environmental Health Source Type: research

The contribution of cooking appliances and residential traffic proximity to aerosol personal exposure
This study also suggest that traffic is a dominant source of exposure to BC, since people living near busy roads are exposed to higher BC concentrations than those living further away from traffic. In contrast, the contribution of indoor sources to personal exposure to PM2.5 and UFP seems to be greater than from outdoor traffic sources. This is probably related to a combination of the type of building construction and a varying range of activities conducted indoors. It is recommended to ensure a good ventilation during cooking to minimize exposure to cooking aerosols. (Source: Journal of Environmental Health Science and Engineering)
Source: Journal of Environmental Health Science and Engineering - January 22, 2021 Category: Environmental Health Source Type: research

Indoor transmission dynamics of expired SARS-CoV-2 virus in a model African hospital ward
AbstractCough and sneeze droplets ’ interactions with indoor air of a typical hospital clinic that could be majorly found in developing African countries were studied to investigate the effectiveness of existing guidelines/protocols being adopted in the control of the widespread coronavirus disease (COVID-19) transmission. The inf luences of indoor air velocity, the type, size distribution, residence time in air, and trajectory of the droplets, were all considered while interrogating the effectiveness of physical distancing measures, the use of face covers, cautionary activities of the general public, and the plausib...
Source: Journal of Environmental Health Science and Engineering - January 22, 2021 Category: Environmental Health Source Type: research

Relationship between algae diversity and water quality- a case study: Chah Niemeh reservoir Southeast of Iran
AbstractAlgae are known with many detrimental impacts on drinking water quality. Discharge of municipal and agricultural wastewater into the receiving water resources make desirable conditions for algae growth and consequently cause eutrophication phenomena. Water samples were withdrawn monthly from 5 stations in Zabol City within spring and summer seasons. To identify algae species, micronutrients, and physical parameters such as temperature, depth of Secchi disk (SD) and pH on their growth were evaluated. The average phosphate in spring and summer were observed to be 0.034 and 0.028  mg/L, respectively. The results ...
Source: Journal of Environmental Health Science and Engineering - January 22, 2021 Category: Environmental Health Source Type: research

Optimization of UV-Electroproxone procedure for treatment of landfill leachate: the study of energy consumption
AbstractWith increased population, treatment of solid waste landfill and its leachate is of major concern. Municipal landfill leachate shows variable, heterogeneous and incontrollable characteristics and contains wide range highly concentrated organic and inorganic compounds, in which hampers the application of a solo method in its treatment. Among different approaches, biological treatment can be used, however it is not effective enough to elimination all refractory organics, containing fulvic-like and humic-like substance. In this experimental study, the UV Electroperoxone process as a hybrid procedure has been employed ...
Source: Journal of Environmental Health Science and Engineering - January 22, 2021 Category: Environmental Health Source Type: research

Simultaneous removal of sulfamethoxazole and enhanced denitrification process from simulated municipal wastewater by a novel 3D-BER system
In this study, at an electric current intensity at 60  mA, more than 90.50 ± 4.76% of Sulfamethoxazole (SMX) was degraded. The strengthening of bacterial metabolisms and the sustainment of electrical stimulation contributed to the rapid removal of SMX and nitrates from simulated wastewater by a novel 3D-BER system. From the literature, very few s tudies have been performed to investigate the high risk of nitrates and antibiotics SMX found in wastewater treatment. The highest antibiotic SMX and nitrogen removal efficiency was 96.45 ± 2.4% (nitrate-N), 99.5 ±&thins...
Source: Journal of Environmental Health Science and Engineering - January 18, 2021 Category: Environmental Health Source Type: research

Characterization, possible sources and health risk assessment of PM2.5-bound Heavy Metals in the most industrial city of Iran
This study has been designed and performed to examine the concentration of PM2.5-bound heavy metals, risk assessment, possible sources and effect of meteorological parameters on 17 sites of the air of the most industrial city of Iran (Karaj) in 2018-19. For this purpose, four samples were taken from every point of Karaj air over one year using a pump (Leland Legacy (SKC)) with flow rate of 3  L/min on PTFE filter for 24 h. Overall, 68 samples of PM2.5-bound heavy metals were collected. Note that during the sampling, atmospheric parameters including temperature, pressure, humidity, and wind speed were regularly re...
Source: Journal of Environmental Health Science and Engineering - January 15, 2021 Category: Environmental Health Source Type: research

Aliphatic hydrocarbons in urban runoff sediments: a case study from the megacity of Tehran, Iran
AbstractUrban runoff is known as an important contributor to diffuse a wide range of pollutants to receiving environments. Hydrocarbons are common contaminants in runoff mainly transported coupled to suspended particles and sediments. The aim of the study was to investigate the distribution and sources of Aliphatics in the sediments of Tehran ’s runoff drainage network. Thirty surface sediment samples were collected along with three main sub-catchments of Tehran during April 2017. The concentrations of n-Alkanes (nC-11-nC-35) and isoprenoids were determined by GC-MS, and their possible emission sources were evaluated...
Source: Journal of Environmental Health Science and Engineering - January 12, 2021 Category: Environmental Health Source Type: research

Assessment of incremental lifetime cancer risks of ambient air PM 10 -bound PAHs in oil-rich cities of Iran
This study investigates the concentrations of PM10-bound PAHs and their seasonal variations in three cities of Ahvaz, Abadan, and Asaluyeh in Iran. The mean concentrations of PM10 in two warm and cold seasons in Ahvaz were higher and in Abadan and Assaluyeh were lower than the national standard of Iran and the guidelines of the World Health Organization. The Σ16 PAHs concentration in ambient air PM10 during the cold season in Ahvaz, Abadan and Asaluyeh was 244.6, 633, and 909  ng m− 3, respectively, and during the warm season in Ahvaz, Abadan, and Asaluyeh was 242.1, 1570 and 251  ng m−&t...
Source: Journal of Environmental Health Science and Engineering - January 12, 2021 Category: Environmental Health Source Type: research

Aerosolized SARS-CoV-2 exposure assessment: dispersion modeling with AERMOD
AbstractCOVID-19 is now a pandemic and the knowledge gap on SARS-CoV-2, i.e., the COVID-19 disease agent, dispersion persists. The US Centers for Disease Control and Prevention suggests fomites may not be the main route through which the novel coronavirus spreads. Supporting the same view, the latest the World Health Organization report recommends wearing masks for every individual in public, highlighting the transmission through the air. In the current study AERMOD, one of the most validated and tested models suggested by the USEPA, is used to model SARS-CoV-2-laden PM10 in a hypothetical outdoor environment. Multiple sce...
Source: Journal of Environmental Health Science and Engineering - January 12, 2021 Category: Environmental Health Source Type: research

Urinary parabens, bisphenol A and triclosan in primiparas from Shenzhen, China: Implications for exposure and health risks
This study aims to investigate urinary levels of parabens, bisphenol A and triclosan of 84 primiparas from Shenzhen, China and to evaluate their potential health risks. Methyl, ethyl, and n-propyl parabens bisphenol A and triclosan exhibited high detection rates (DRs) (>  97%) in urine samples, suggesting that primiparas are exposed to them widely. The median concentrations of methyl, ethyl, and n-propyl parabens, bispenol A and triclosan in urine were 2.14, 4.10, 0.46, 1.30 and 3.00 µg/L, respectively. Ethyl paraben was the predominant paraben accounting for ne arly half of Σ3parabens (The sum c...
Source: Journal of Environmental Health Science and Engineering - January 12, 2021 Category: Environmental Health Source Type: research

Municipal solid waste management during COVID-19 pandemic: a comparison between the current activities and guidelines
The objective of this study was to evaluate the application of guidelines presented for the era of the COVID-19 pandemic in proper solid waste management. To this end, the data were collected by using interviews and field researches and then the obtained data were compared with the international guidelines presented by international organizations. By investigat ing the municipal waste management during this pandemic and its changes compared to pre-COVID-19, coordination of the plans with the guidelines was investigated. The activities of storage, collection, transportation, recycling, final landfill, as well as the observa...
Source: Journal of Environmental Health Science and Engineering - January 12, 2021 Category: Environmental Health Source Type: research

Influence of the meteorological conditions and some pollutants on PM 10 concentrations in Lamphun, Thailand
AbstractParticulate matter (PM) has been occurring regularly during the dry season in the upper north of Thailand including Lamphun Province that might be influenced by various factors including climatologic and other pollutants. This paper aims to investigate the climatologic and gaseous factors influencing the occurrence of PM10 concentration using Pollution Control Department (PCD) data. The secondary data of 2009 to 2017 obtained from the PCD was used for analysis. We used descriptive statistics, Pearson ’s correlation coefficient, multiple regression and graphic presentation using R program (R packages of &lsquo...
Source: Journal of Environmental Health Science and Engineering - January 7, 2021 Category: Environmental Health Source Type: research

Substrate evaluation for biobeds in the degradation of ethylene bis-dithiocarbamate in wastewater from pesticide application in banana
AbstractThe efficacy of biobeds was evaluated by testing three agricultural residues (sugarcane top, banana stem, and eucalyptus chip) as substrates for the degradation of ethylene bis-dithiocarbamate (EBDC) and ethylene thiourea (ETU) in wastewater from banana spraying. Acrylic columns with a capacity to treat 1  L/ea. of wastewater were used as experimental units. Each unit was filled with different proportions of the test substrate (30%, 50% and 70% v/v) and the difference in volume was made up of equal parts of sugar cane cachasse and Fluvisol soil. Subsequently, the units were contaminated with suspens ions of 87...
Source: Journal of Environmental Health Science and Engineering - January 7, 2021 Category: Environmental Health Source Type: research

Determination of melamine contamination in chocolates containing powdered milk by high-performance liquid chromatography (HPLC)
In this study, 60 samples of chocolates containing powdered milk, both imported and domestic brands, were collected. The samples were prepared by solid phase extraction (SPE) and analyzed using high-performance liquid chromatography (HPLC). According to the results, melamine was found in about 94% of imported samples and about 77% of Iranian samples. Melamine concentration in imported samples ranged from 0.032 to 2.692  mg/kg, while in Iranian ones it ranged from 0.013 to 2.600 mg/kg. The mean melamine concentrations of foreign and Iranian samples were 0.685 ± 0.68 and 0.456 ± 0....
Source: Journal of Environmental Health Science and Engineering - January 7, 2021 Category: Environmental Health Source Type: research

Removal of per- and polyfluoroalkyl substances from aqueous media using synthesized silver nanocomposite-activated carbons
ConclusionThe interplay of electrostatic attraction and hydrophobic interactions enabled the removal of PFAS using PAMTAg and CAMTAg. Findings suggest that PAMTAg and CAMTAg are effective for the removal of PFAS from aqueous media and are good alternatives to commercially available activated carbons.Graphical abstract (Source: Journal of Environmental Health Science and Engineering)
Source: Journal of Environmental Health Science and Engineering - January 7, 2021 Category: Environmental Health Source Type: research

Benzene emissions from gas station clusters: a new framework for estimating lifetime cancer risk
ConclusionThe framework we developed for estimating cancer risk from gas station(s) could be adopted by regulatory agencies to make setback distances a function of sales volume and the number of gas stations in a cluster, rather than on a sales volume category. (Source: Journal of Environmental Health Science and Engineering)
Source: Journal of Environmental Health Science and Engineering - January 7, 2021 Category: Environmental Health Source Type: research

A new approach to enhance the conventional two-phase anaerobic co-digestion of food waste and sewage sludge
ConclusionsThis new modification in two-phase anaerobic co-digestion of food waste and sewage sludge provides a potentially feasible practice for simultaneous bio-methane, organic fertilizer, and high supernatant quality achievement.Graphical abstract (Source: Journal of Environmental Health Science and Engineering)
Source: Journal of Environmental Health Science and Engineering - January 7, 2021 Category: Environmental Health Source Type: research

Effect of water-soluble PM 10 on the production of TNF- α by human monocytes and induction of apoptosis in A549 human lung epithelial cells
In conclusion, airborne dust particles in Ahvaz city contain active compounds capable of increasing production of the pro-inflammatory cytokine, TNF-α, and inducing apoptosis of lung epithelial cells. (Source: Journal of Environmental Health Science and Engineering)
Source: Journal of Environmental Health Science and Engineering - January 7, 2021 Category: Environmental Health Source Type: research

Airborne particulate matter in Tehran ’s ambient air
In this study, a search protocol was defined by identifying the keywords, to carry out a systematic review of the concentrations and composition of PM in Tehran’s ambient air. For this purpose, searches were done in Scopus, PubMed, and Web of Science in 2019. Amo ng the founded articles (197 in Scopus, 61 in PubMed, and 153 in Web of Science). The results show that in Tehran, the annual average PM10 exceeded the WHO guidelines and for more than 50.0% of the days, the PM2.5 concentration was more than WHO 24-h guidance value. The PM concentration in Tehran has two seasonal peaks due to poorer dispersion and suspension...
Source: Journal of Environmental Health Science and Engineering - January 7, 2021 Category: Environmental Health Source Type: research

Synthesis of modified ZnO nanorods and investigation of its application for removal of phthalate from landfill leachate: A case study in Aradkouh landfill site
In this study, zinc oxide nanorods, co-doped with iron and silver, were synthesized in a co-precipitation method. Its properties were determined using X-ray diffraction (XRD), Transmission electron microscopy (TEM), Field Emission Scanning Electron Microscopy (FE-SEM), Brunauer –Emmett–Teller (BET), Dynamic light scattering (DLS) and X-ray photoelectron spectroscopy (XPS) analysis. The results of FE-SEM and TEM showed that zinc oxide nanoparticles synthesized and co-doped with iron and silver were formed as separate nanorods. Also, the average values of DBP and DEHP am ount of phthalates in the leachate from th...
Source: Journal of Environmental Health Science and Engineering - January 7, 2021 Category: Environmental Health Source Type: research

Developing a model to predict air pollution (case study: Tehran City)
In this study, the meteorological monthly data were employed to achieve potent models based on a Box-Jenkins method for the modelling of concentration level of five major air pollutants in Tehran such as NO2, PM10, O3, SO2, CO, and Pollutant Standard Index. The best models were selected using goodness of fit criteria such as Akaike Information Criterion (AIC) and Schwartz Bayesian Criterion (SBC) and least prediction error. Prediction of concentrations of those pollutants can be a powerful tool in order to take preventive measures, such as the reduction of emissions and alerting the affected population. The results indicat...
Source: Journal of Environmental Health Science and Engineering - January 7, 2021 Category: Environmental Health Source Type: research

Implication of excessive length of stay of asthma patient with heterogenous status attributed to air pollution
ConclusionsThe KNN embedded approach is an innovative method that takes into account the heterogeneous patient status, and effectively estimates the impact of air pollution on the ELoS. It is concluded that air pollution poses adverse effects and additional financial burdens on asthma patients. Heterogeneous patients should adopt different strategies in health management to reduce the risk of increasing the ELoS due to air pollution, and improve the efficiency of medical resource utilization. (Source: Journal of Environmental Health Science and Engineering)
Source: Journal of Environmental Health Science and Engineering - January 7, 2021 Category: Environmental Health Source Type: research

Bioavailability, distribution and health risk assessment of arsenic and heavy metals (HMs) in agricultural soils of Kermanshah Province, west of Iran
In this study, contamination status, bioavailability, spatial distribution, and ecological and human health risk of arsenic and heavy metals (HMs) in soil were investigate. For this purpose, 121 agricultural soil samples were collected and analyzed using ICP-MS. The data were studied by calculating some geochemical indices, and using geographical information system and statistical analysis. Results showed that Cd has the highest bioavailability, following by Cu and As. Also, Cu was severely associated with organic matter. Enrichment factor (EF) followed the order of As> Cu  >  Pb >  Se&...
Source: Journal of Environmental Health Science and Engineering - January 6, 2021 Category: Environmental Health Source Type: research

Amoxicillin separation from aqueous solution by negatively charged silica composite membrane
AbstractSilica composite membranes were successfully prepared by acid/ base-catalyzed sol-gel method and characterized by SEM, FTIR, AFM and contact angle Low isoelectric point of the silica layers provided negatively charged composite membranes, resulting electrostatic repulsion forces between membrane surface and amoxicillin molecules at higher pHs. The rejection rate of amoxicillin was studied systematically at different pHs, solute concentrations, transmembrane pressures and temperatures. It was found that acid-catalyzed membrane has higher amoxicillin rejection ratio compared to base-catalyzed membrane. Especially, ac...
Source: Journal of Environmental Health Science and Engineering - January 5, 2021 Category: Environmental Health Source Type: research

Lipid and biodiesel production by cultivation isolated strain Chlorella sorokiniana pa.91 and Chlorella vulgaris in dairy wastewater treatment plant effluents
AbstractThe present study provided a comparison of two species of microalgae growth in dairy wastewater treatment plant effluents. In optimum conditions their operation to biomass production, lipid accumulation and fatty acids methyl ester composition so as to biodiesel production is studied. For the first time, the not sterilized effluents of dairy wastewater treatment plant was used as the culture mediums of native microalgae,Chlorella sorokiniana strain pa.91, and another oneChlorella vulgaris. They were cultured under 5 light intensity levels so as to find optimum conditions to observed high biomass and lipid productio...
Source: Journal of Environmental Health Science and Engineering - December 1, 2020 Category: Environmental Health Source Type: research

Synthesis and characterization of an NH 4 CL-induced Eskanbil activated carbon (EAC) for the removal of penicillin G from contaminated water
This study aimed to determine the efficiency of modified Eskanbil activated carbon for the removal of PG from aqueous solutions. The NH4Cl-induced activated carbon was synthesized by a simple method and used for the degradation of PG in contaminated water. Activated carbon was characterized by Fourier transform infrared spectroscopy (FTIR), Field emission scanning electron microscopy (FESEM), and Brunauer –Emmett–Teller (BET) surface area analysis. The four main reaction parameters optimized in this study were pH, time, the concentration of the EAC (Eskanbil Activated Carbon), and initial PG concentration. The ...
Source: Journal of Environmental Health Science and Engineering - December 1, 2020 Category: Environmental Health Source Type: research

Assessment of bioavailability and mobility of major and trace elements in agricultural soils collected in Port St Johns, Eastern Cape, South Africa using single extraction procedures and pseudo-total digestion
ConclusionsBased on the results obtained, it can be concluded that the high levels of some studied metals was due to anthropogenic activities. (Source: Journal of Environmental Health Science and Engineering)
Source: Journal of Environmental Health Science and Engineering - November 18, 2020 Category: Environmental Health Source Type: research

Dye removal from water and wastewater by nanosized metal oxides - modified activated carbon: a review on recent researches
AbstractThe conventional water and wastewater treatment methods are unable to provide up-to-data organized standards for drinking water and discharging effluents into natural ecosystems. Therefore, developing advanced and cost-effective methods to achieve published standards for water and wastewater and population needs are nowadays necessity. The important parts of this article are providing literature information about dyes and their effects on the environment and human health, adsorption properties and mechanism, adsorbent characteristics, and recent information on various aspects of modified activated carbons with nano...
Source: Journal of Environmental Health Science and Engineering - November 5, 2020 Category: Environmental Health Source Type: research

The effect of Ca-bearing contents in chitosan on Pb 2+ , Cd 2+ and Cu 2+ adsorption and its adsorption mechanism
This study investigated the effects of chitosan with chemically controlled Ca-bearing contents (CBC) on Pb2+, Cd2+ and Cu2+ adsorption in the solution with the initial pH values of 2.10, 4.14 and 6.13. Highly purified chitosan showed the optimum HM adsorption at the initial pH values of 4.14 and 6.13, and the adsorption mechanism was chemisorption involving valence forces through sharing or exchange of electrons between the chitosan and HM ions. Highly purified chitosan prepared from HCl treated chitin only showed effective for Pb2+, however, those prepared from CH3COOH treated chitin showed effective for Pb2+, Cd2+ and Cu...
Source: Journal of Environmental Health Science and Engineering - November 4, 2020 Category: Environmental Health Source Type: research

Health risk assessment of selected metals through tap water consumption in Upper Silesia, Poland
AbstractThe research focused on assessing the risk to human health resulting from the content of selected Cr, Co, Mn, Cu, Ni, Pb, As, Zn and Sr metals in tap water supplied by Upper Silesia Water Plant to the inhabitants of the Upper Silesia region (Poland). It is the main supplier of drinking water to several million inhabitants of this agglomeration. Samples were taken and analyzed quarterly in 2019. The sampling points were chosen to help identify the source when an elevated level of a particular contaminant is observed. ICP-MS and ICP-OES have been used to measure the concentrations of those elements. The chronic daily...
Source: Journal of Environmental Health Science and Engineering - October 31, 2020 Category: Environmental Health Source Type: research

Graphene quantum dots based on maltose as a high yield photocatalyst for efficient photodegradation of imipramine in wastewater samples
ConclusionsThe proposed method was successfully applied to degrade the mentioned drug in the real wastewater samples by about 70%. Regarding the mentioned advantages by the proposed method, this new kind of photocatalytic material possesses a strong potential for photodegradation of pollutants in industrial wastewater samples.Graphical abstractPhotodegradation of imipramine using graphene quantum dots based on maltose. (Source: Journal of Environmental Health Science and Engineering)
Source: Journal of Environmental Health Science and Engineering - October 31, 2020 Category: Environmental Health Source Type: research

Architectural design strategies for infection prevention and control (IPC) in health-care facilities: towards curbing the spread of Covid-19
ConclusionThe findings showed that design strategies have always played a significant role in infection prevention and control (IPC) and could as well be a panacea for  curbing the spread of Covid -19. (Source: Journal of Environmental Health Science and Engineering)
Source: Journal of Environmental Health Science and Engineering - October 30, 2020 Category: Environmental Health Source Type: research

Influence of synthetic wastewater on entrapped air on the isotactic and atactic polypropylene microplastic surfaces
AbstractThe municipal wastewater collection system is recognized as an initial point of interaction between microplastics (MPs) and the urban wastewater matrix. The raw wastewater contains a wide variety of organic and inorganic substances including chemicals and heavy metals. However, the fate of MPs in urban sewer systems is not yet well understood. In this work two types of virgin polypropylene (PP) samples, isotactic (iPP) and atactic (aPP), were exposed to two synthetic wastewater solutions in order to study their effects on the physical properties of the hydrophobic polymer surfaces. Particular attention was paid to ...
Source: Journal of Environmental Health Science and Engineering - October 30, 2020 Category: Environmental Health Source Type: research

Covalent organic framework and montomorillonite nanocomposite as advanced adsorbent: synthesis, characterization, and application in simultaneous adsorption of cationic and anionic dyes
AbstractIn this work, Schiff base network-1 (SNW-1), as a new generation of covalent organic frameworks (COFs), was synthesized and modified by fabrication of a composite with clay mineral montomorillonite (Mt). It was used for simultaneous removal of anionic and cationic dyes from aqueous solutions. The fabricated composite was characterized successfully with various techniques. Tartrazine (TT) and methylene blue (MB) were selected as model anionic and cationic dyes, respectively. The effects of the percentage of each component in the composite, initial pH, and initial dye concentration were evaluated on the adsorption ca...
Source: Journal of Environmental Health Science and Engineering - October 27, 2020 Category: Environmental Health Source Type: research

Human health risk estimation and predictive modeling of halogenated disinfection by- products (chloroform) in swimming pool waters: a case study of Dhanbad, Jharkhand, India
AbstractDisinfection is an important process to make the water free from harmful pathogenic substances, but sometimes it results in the formation of harmful by-products. Development of predictive models is required to define the concentration of THMs in pool water. Majority of studies reported inhalation to be the most significant THMs exposure route which is more likely to be dependent upon the concentration of THMs in pool water and in air. THMs concentration in the analyzed pool water samples and in air was found to be 197.18  ± 16.31 μg L−1 and 0.033  μg m3 –1,...
Source: Journal of Environmental Health Science and Engineering - October 27, 2020 Category: Environmental Health Source Type: research

Comparing the efficiency of unmodified dried sludge adsorbents and those modified via chemical and microwave methods in removing 2,4-dinitrophenol from aqueous solutions
This study aims to compare the efficiency of non-modified and modified dried sludge adsorbents in removing 2,4 DNP from aqueous solutions. The results of 2,4DNP removal by high-performance liquid chromatography method at the wavelength of 360  nm in a batch mode were obtained by changing the influential factors including contact time, pH, initial concentration of the contaminant, and adsorbent dosage. Eventually, the results were analyzed by kinetic and isotherm models. In this research, the optimal time was obtained as 60 min and pH a s seven for all three adsorbents. The results showed that the removal percenta...
Source: Journal of Environmental Health Science and Engineering - October 27, 2020 Category: Environmental Health Source Type: research

Investigating the relationship between extended spectrum β-lactamase producing Escherichia coli in the environment and food chains with the presence of this infection in people suspected of septicemia: Using the fuzzy set qualitative comparative analysis
ConclusionsAccording to the results of this study, if there is a contamination of hospital wastewater and chickens in an area, it can be claimed that people suspected of septicemia are infected with ESBLE. coli, and the percentage of this contamination can be high. On the other hand, controlling ESBLE. coli in hospital wastewater (environmental chain) and chickens (food chain) can prevent contamination in people with suspected septicemia. (Source: Journal of Environmental Health Science and Engineering)
Source: Journal of Environmental Health Science and Engineering - October 25, 2020 Category: Environmental Health Source Type: research

Green synthesis of SnO 2 -ZnO-eggshell nanocomposites and study of their application in removal of mercury (II) ions from aqueous solution
ConclusionsThe present approach has advantages such as rapidity, simplicity, selectivity, low cost and, most importantly, the use of nanocomposites containing a bio-waste material of eggshell for removal of Hg(II) ions from aqueous solution. (Source: Journal of Environmental Health Science and Engineering)
Source: Journal of Environmental Health Science and Engineering - October 25, 2020 Category: Environmental Health Source Type: research

Enhancement of photocatalytic potential and recoverability of Fe 3 O 4 nanoparticles by decorating over monoclinic zirconia
ConclusionThe excellent photodegradation efficacy and sustainability of Fe3O4/ZrO2 NPs can be attributed to the homogenous distribution of Fe3O4 NPs over ZrO2, which facilitates the generation of photoexcitons (electrons and holes), enhanced charge transfer and minimize the charge recombination. (Source: Journal of Environmental Health Science and Engineering)
Source: Journal of Environmental Health Science and Engineering - October 25, 2020 Category: Environmental Health Source Type: research

Advanced biodegradation process of atrazine in the peroxidase-mediated sequencing batch reactor (SBR) and moving-bed SBR (MSBR): mineralization and detoxification
AbstractThe advanced biodegradation process of atrazine was stimulated with hydrogen peroxide (H2O2) in a sequencing batch reactor (SBR) under different operational conditions due to in situ generation of H2O2-peroxidase. The complete biodegradation and mineralization of 50  mg/L atrazine was achieved in the SBR with a biomass concentration of 328 mg/L stimulated with 10 mM of H2O2. The presence of H2O2 in the SBR induced the generation of H2O2-peroxidase resulted in acceleration of atrazine biodegradation. Adding moving media to the SBR system and converting it to the MSBR considerably improved the rate of ...
Source: Journal of Environmental Health Science and Engineering - October 24, 2020 Category: Environmental Health Source Type: research

Dose-response meta-analysis of arsenic exposure in drinking water and intelligence quotient
ConclusionsConsidering the significance of the relationship between arsenic concentration in drinking water and the level of intelligence quotient as an important factor in training, the level of arsenic and its associated risks should be decreased in water resources. (Source: Journal of Environmental Health Science and Engineering)
Source: Journal of Environmental Health Science and Engineering - October 22, 2020 Category: Environmental Health Source Type: research

Effect of sludge recirculation on removal of antibiotics in two-stage membrane bioreactor (MBR) treating livestock wastewater
AbstractTwo-stage MBR consisting of anaerobic and aerobic reactors was operated at total hydraulic retention time (HRT) of 48  h for the treatment of livestock wastewater containing antibiotics, i.e. amoxicillin (AMX), tiamulin (TIA), and chlortetracycline (CTC), under the (1st) absence and (2nd) presence of sludge recirculation between the reactors. During the operation with sludge recirculation, the removals of organic and nitrogen were enhanced. Meanwhile, the removals of TIA and CTC were found to decrease by 9% and 20% in the aerobic reactor but increased by 5% to 7% in the anaerobic reactor due to the relocation ...
Source: Journal of Environmental Health Science and Engineering - October 20, 2020 Category: Environmental Health Source Type: research

Study of chemical wastes in the Iranian petroleum industry and feasibility of hazardous waste disposal
AbstractOil production activities have expanded and the use of chemicals in industry has increased and generated various types of wastes. The main objective of this paper Proposes to determine the quantitative and qualitative characteristics of chemical waste in the Iranian Petroleum industry. It is conducted in accordance with international laws and regulations such as RCRA and Basel. There is currently no disposal method for these substances, but the results show that more than 73% of the chemical waste can dispose through sanitary landfill. For the case study, more than 160 hazardous chemical substances were investigate...
Source: Journal of Environmental Health Science and Engineering - October 16, 2020 Category: Environmental Health Source Type: research

Reducing the harmful effects of noise on the human environment. Sound insulation of industrial skeleton enclosures in the 10 –40 kHz frequency range
ConclusionSome pieces of equipment installed in the work environment are sources of noise emitted in the 10 –40 kHz frequency range with the intensity which can be high enough to be harmful to humans. The most effective technical reduction of the associated risks are acoustic enclosures for such noise sources. The sound pressure level reduction obtained after provision of an enclosure depends on its de sign (shape, size, material, and thickness of walls) and the noise source frequency spectrum. Realistically available noise reduction values may exceed 60 dB. (Source: Journal of Environmental Health Science and Engineering)
Source: Journal of Environmental Health Science and Engineering - October 15, 2020 Category: Environmental Health Source Type: research

Correlations between Meteorological Indicators, Air Quality and the COVID-19 Pandemic in 12 Cities across China
ConclusionsOur study provides a new basis for correlations between COVID-19, meteorological indicators and air quality index, which can help authorities to combat COVID-19. (Source: Journal of Environmental Health Science and Engineering)
Source: Journal of Environmental Health Science and Engineering - October 15, 2020 Category: Environmental Health Source Type: research

Size distribution of microbial aerosols in overground and subterranean treatment chambers at health resorts
Conclusionsthe microbiological quality of the air in sanatoriums and health resorts is a key factor for their therapeutic and prophylactic functions. When microbial pollution crossed the acceptable level, the measures that enable reducing undesirable contamination should be introduced, especially if large groups of patients undergo such therapy. (Source: Journal of Environmental Health Science and Engineering)
Source: Journal of Environmental Health Science and Engineering - October 14, 2020 Category: Environmental Health Source Type: research

Spatiotemporal analysis and hotspots detection of COVID-19 using geographic information system (March and April, 2020)
In conclusion, hot spot analysis coupled with Anselin local Moran ’sI provides a scrupulous and objective approach to determine the locations of statistically significant clusters of COVID-19 cases shedding light on the high-risk districts. (Source: Journal of Environmental Health Science and Engineering)
Source: Journal of Environmental Health Science and Engineering - October 12, 2020 Category: Environmental Health Source Type: research