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Performance of an anaerobic sequencing batch reactor operating under high organic loading in treatment of biodiesel wastewater
This study aimed to contribute to the technical and scientific literature by reporting the experience obtained when biodiesel wastewater was treated in an AnSBR applying organic loading rates (OLR) above those commonly used in batch reactor projects. For this, physicochemical and chromatographic analysis of the effluent were carried out. Further, the biomass was assessed chemically and morphologically, along with bacterial diversity characteristics. Supported by these analyses, the system performance was discussed in terms of COD remotion efficiency and buffering capacity. The AnSBR reached 10% of COD removal at the steady...
Source: Journal of Environmental Health Science and Engineering - August 20, 2022 Category: Environmental Health Source Type: research

Monitoring and risk assessment of exposure to organochlorine pesticides through the water supply system, case of Karkheh River in southwest Iran
AbstractIn this investigation, the concentration of some organochlorine pesticides (OCPs) was monitored in the Karkheh River and the risk assessment of exposure to these pesticides residue through the water supply system was calculated. The mean concentrations of Lindane, Heptachlor, Chlordane, Dieldrin, Endrin, DDT were 0.135, 0.123, 0.077, 0.081, 0.076, 0.01  µg/L, respectively. The average risk of Lindane, Heptachlor, Chlordane, Dieldrin, DDT, and Endrin for adults was 1.2 E-6, 1.1E-6, 7E-7, 7.6E-7, 9E-8, 7E-7 or non-carcinogenic risks to adults decreased in Dieldrin >  Chlordane >  Heptachlor >  ...
Source: Journal of Environmental Health Science and Engineering - August 19, 2022 Category: Environmental Health Source Type: research

The links between microclimatic and particulate matter concentration in a multi-storey car parking: a case study iran
This study measured the levels of emitted PM1, PM2.5, and PM10 by GRIMM EDM 107 laser dust monitor in a busy multi-storey parking garage located in Qom. Moreover, the relationship between microclimatic parameters and the contaminants mentioned above was investigated. Samples were collected in two stages in different spatiotemporal conditions, namely, the summer and autumn of 2017. The results indicate that during the sampling period, the daily mean  ± standard deviation of PM10, PM2.5, and PM1 were 120.9  ± 90.6, 28.5 ± 10.4, and 10.8 ± 3.8 µg/m3, respectively. A decrease in pollution level was observ...
Source: Journal of Environmental Health Science and Engineering - August 18, 2022 Category: Environmental Health Source Type: research

Meteorological dependence, source identification, and carcinogenic risk assessment of PM2.5-bound Polycyclic Aromatic Hydrocarbons (PAHs) in high-traffic roadside, urban background, and remote suburban area
In this study, The PM2.5 samples were collected by high volume air samplers simultaneously from three different sites (high-traffic roadside, urban background, and remote suburban) in Tehran, Iran during warm and cold seasons (from July 2018 to March 2019), and 16 PAHs were analyzed using Gas Chromatography-Mass Spectrometry (GC –MS). Unlike previous studies, a remote suburban area was chosen so as to observe the spatial differentiation in PM2.5-bound PAH characteristics. In high-traffic roadside site, the average concentration of total PM2.5-bound PAHs ( ƩPAHs) was 3.7 times the concentration value in remote suburban a...
Source: Journal of Environmental Health Science and Engineering - August 16, 2022 Category: Environmental Health Source Type: research

Advancement in “Garbage In Biomaterials Out (GIBO)” concept to develop biomaterials from agricultural waste for tissue engineering and biomedical applications
AbstractPresently on a global scale, one of the major concerns is to find effective strategies to manage the agricultural waste to protect the environment. One strategy that has been drawing attention among the researchers is the development of biocompatible materials from agricultural waste. This strategy implies successful conversion of agricultural waste products (e.g.: cellulose, eggshell etc.) into building blocks for biomaterial development. Some of these wastes contain even bioactive compounds having biomedical applications.  The replacement and augmentation of human tissue with biomaterials as alternative to tradi...
Source: Journal of Environmental Health Science and Engineering - July 31, 2022 Category: Environmental Health Source Type: research

Improvement of natural fiber's properties and evaluation of its applicability as eco-friendly materials in noise pollution control
ConclusionFinally, the alkali treatment has enhanced the properties of jute fibers and confirmed the applicability of these fibers in acoustic absorption. (Source: Journal of Environmental Health Science and Engineering)
Source: Journal of Environmental Health Science and Engineering - July 24, 2022 Category: Environmental Health Source Type: research

Use of Taguchi design for optimization of diesel-oil biodegradation using consortium of Pseudomonas stutzeri, Cellulosimicrobium cellulans, Acinetobacter baumannii and Pseudomonas balearica isolated from tarball in Terengganu Beach, Malaysia
AbstractA consortium of bacteria capable of decomposing oily hydrocarbons was isolated from tarballs on the beaches of Terengganu, Malaysia, and classified asPseudomonas stutzeri,Cellulosimicrobium cellulans,Acinetobacter baumannii andPseudomonas balearica. The Taguchi design was used to optimize the biodegradation of diesel using these bacteria as a consortium. The highest biodegradation of diesel-oil in the experimental tests was 93.6%, and the individual n-alkanes decomposed 87.6 —97.6% over 30 days. Optimal settings were inoculum size of 2.5 mL (1.248 OD600nm); 12% (v/v) the initial diesel-oil in a minimal salt med...
Source: Journal of Environmental Health Science and Engineering - July 19, 2022 Category: Environmental Health Source Type: research

Evaluation of the lipase from castor bean (Ricinus Communis L.) as a potential agent for the remediation of used lubricating oil contaminated soils
AbstractBioremediation of hydrocarbons-contaminated soils, using enzymes, is considered an alternative technology for soil remediation, obtaining shorter remediation times, greater removal efficiencies, and less waste generation. The lipases from invasive plants such as castor bean (Ricinus Communis L.) could represent an opportunity for its application in this purpose. This paper reports the results of evaluating enzymatic treatment at different conditions for the remediation of used lubricating oil-contaminated soils. Four assays were performed for the removal of the contaminant in a soil sample: (1) natural attenuation ...
Source: Journal of Environmental Health Science and Engineering - July 18, 2022 Category: Environmental Health Source Type: research

A comparative study for hybrid UASB reactor performance using polyethylene media and luffa sponge as biofilm support
AbstractThis paper study the performance of a lab-scale hybrid up-flow anaerobic sludge blanket (UASB) reactor treating low-strength synthetic wastewater using different biofilm supporting materials. Two identical reactors are constructed and operated at constant up-flow velocity of 0.1  m/hr., inflow rate of 9.76 L/d, and hydraulic retention time (HRT) of 8.26 hours. The Start-up phase, using seed sludge for existing wastewater treatment plant, lasted until the efficiency of chemical oxygen demand (COD) removal of both reactors reached 80%. Polyethylene (PE) media are added to one of the reactors and luffa sponge is us...
Source: Journal of Environmental Health Science and Engineering - July 11, 2022 Category: Environmental Health Source Type: research

Increased allergic and asthmatic risks in children residing in industrial areas by surveying the pre-inflammatory (IgE, IL-4 and IL-13) biomarkers
AbstractToxic metal(loid)s can lead to high damages on human. This work was conducted to investigate the levels of metal(loid)s in PM2.5 and a total of 123 male children ’s (aged 6–9 years) blood chosen from different areas in Ahvaz and their association with thepre-inflammatory (Immunoglobulin E and cytokines: IgE, IL-4 and IL-13) responses in serum cells. Six metal(loid)s (arsenic, cadmium, chromium, mercury, nickel and lead) in three regions including industrial (Padad), vehicle traffic (Golestan) and reference (Kianpars) areas were studied. Results showed the concentrations of As, Cr, Cd, Ni and Hg in the ambient ...
Source: Journal of Environmental Health Science and Engineering - July 6, 2022 Category: Environmental Health Source Type: research

Experimental studies of carbon dioxide concentration in the space under the face mask protecting against Covid-19 – Pilot studies
AbstractMasks are the primary tool used to prevent the spread of COVID-19 in the current pandemic. The use of masks may result in some discomfort, which may be caused by the accumulation of carbon dioxide in the inner space of the mask. This paper presents tests of carbon dioxide concentration in the inner space of the mask during work at a computer, for various flat and convex masks. Five different masks were used in the tests. Convex masks showed a greater accumulation of carbon dioxide than flat masks. The concentration of carbon dioxide was also higher for masks made of more layers. The dependence of the average values...
Source: Journal of Environmental Health Science and Engineering - July 6, 2022 Category: Environmental Health Source Type: research

Bacterial strains diversity in contaminated soils and their potential for bioremediation of total petroleum hydrocarbons in south west of Iran
ConclusionIndigenous bacteria in oil-contaminated soils of an oilfield in south west of Iran were found to be able to degrade Total Petroleum Hydrocarbons. Our results showed that bioremediation of oil-contaminated soils can be implemented without need to amplification of heterogeneous bacteria. Considering sandy loam texture of soil samples, the identified strains of bacteria could be introduced as sufficient consortium for biodegradation of this soils with similar texture. (Source: Journal of Environmental Health Science and Engineering)
Source: Journal of Environmental Health Science and Engineering - July 6, 2022 Category: Environmental Health Source Type: research

Quantitative microbial risk assessment of enteroviruses in raw-eatable vegetables irrigated by wastewater: examining different scenarios of washing
In this study, a quantitative microbial risk assessment (QMRA) with probabilistic Monte-Carlo simulation was used to estimate the annual risk of enteroviruses (EVs) infection and disease burden for consumers of effluent-irrigated raw vegetables in Tehran, the capital of Iran. Wastewater effluent samples were collected over two seasons: summer and winter. EVs were analyzed in three stages, concentration and separation, cell culture, and real-time PCR (RT-PCR). A questionnaire was used to determine the dominant patterns of vegetable washing by consumers. There were 4 vegetable washing steps: wiping away mud (A), rinsing (B),...
Source: Journal of Environmental Health Science and Engineering - July 5, 2022 Category: Environmental Health Source Type: research

Fabrication of polysulfone mixed matrix membrane for wastewater treatment
AbstractRecent development in separation technologies has envisioned a green and sustainable future that encouraged energy preservation and waste minimization. The concept of a clean future emphasizes on retrieval and reutilization of valuable products from waste streams to improve the water quality. Membrane-based separations are currently explored as an auspicious substitution over traditional separation processes. The present study is designed to purify water using aluminum and gallium mixed matrix membranes from toxic metals (Lead and Mercury) and dyes (Rhodamine B, and Reactive Blue-4). Facile protocol i.e., immersion...
Source: Journal of Environmental Health Science and Engineering - July 2, 2022 Category: Environmental Health Source Type: research

Determination of fluoride content in teas and herbal products popular in Poland
ConclusionsThe rank with respect to the fluoride concentration in an infusion is as follows: black tea  >  green tea >  earl grey >  pu-erh >  white tea>>>rooibos, yerba mate, herbal products. Increasing of brewing time results in an increased fluoride content, but the overall content of fluoride in the analyzed infusions of teas and herbs was not high enough to cause a risk of fluorosis, even if left to brew up to 15  min. (Source: Journal of Environmental Health Science and Engineering)
Source: Journal of Environmental Health Science and Engineering - June 30, 2022 Category: Environmental Health Source Type: research