Effect of pistachio shell as a carbon source to regulate C/N on simultaneous removal of nitrogen and phosphorus from wastewater

Bioresour Technol. 2022 Nov 2:128234. doi: 10.1016/j.biortech.2022.128234. Online ahead of print.ABSTRACTAcid-pretreated pistachio shells were used as carbon sources to investigate the effects of carbon source dosage on simultaneous nitrogen and phosphorus removal under different carbon/nitrogen (C/N) ratios (7, 9, and 11). Results showed that C/N was positively correlated with mixed liquor suspended solids (MLSS) (R2 = 0.998, p<0.01) and f value (R2 = 0.975, p<0.05). Moreover, it was negatively correlated with the sludge volume index (SVI) (R2 = -0.959, p<0.05). C/N was also significantly negatively related to chemical oxygen demand removal rate (R2 = -0.986, p<0.05) and positively related to ammonia nitrogen (NH4+-N), total nitrogen (TN), and total phosphorus (TP) removal rate (p<0.05), the correlation coefficients were 0.992, 0.990 and 0.994, respectively. In the reactor with C/N of 11, the MLSS concentration and f value were the highest, the SVI was the lowest, and the removal efficiencies of NH4+-N (85.49% ± 1.96%), TN (84.19% ± 1.42%) and TP (94.10% ± 1.67%) were the highest. Furthermore, the relative abundance of denitrifying bacteria was the highest in the reactor. The abundance of nitrifying bacteria and phosphorus-removal bacteria was also relatively high.PMID:36334867 | DOI:10.1016/j.biortech.2022.128234
Source: Bioresource Technology - Category: Biotechnology Authors: Source Type: research