Treatment of domestic wastewater by subsurface flow constructed wetlands in Jordan
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Myriophyllum elatinoides growth and rhizosphere bacterial community structure under different nitrogen concentrations in swine wastewater
2020, Bioresource TechnologyCitation Excerpt :The pH of SFCWs ranged from 6.85 to 8.16. The pH was positively correlated with inlet N concentration, which is consistent with the findings of Al-Omari and Fayyad (2003). In this study, a total of 4668 OTUs were classified into 46 phyla, 115 classes, and 665 genera in 30 samples.
Elucidating the impact of influent pollutant loadings on pollutants removal in agricultural waste-based constructed wetlands treating low C/N wastewater
2019, Bioresource TechnologyCitation Excerpt :Only under certain pH conditions microbial activities can occur. The previous studies proved that the denitrification rate could reach the highest at a pH of 7–8 (Al-Omari and Fayyad, 2003). In this study, the effluent pH in CWs with different agricultural biomass materials was varied, and the average pH values were 6.13–8.16 in different systems with wheat straw, apricot pit and walnut shell.
Montmorillonite supported nanoscale zero-valent iron immobilized in sodium alginate (SA/Mt-NZVI) enhanced the nitrogen removal in vertical flow constructed wetlands (VFCWs)
2018, Bioresource TechnologyCitation Excerpt :When NZVI reacted with H2O, OH– was produced. When NZVI reacted with NO3–-N, H+ was consumed, thus increasing the effluent pH. However, the effluent pH decreased with the extension of HRT because the reactivity of reused SA/Mt-NZVI reduced and had the less influence on the effluent pH. The optimum pH for denitrification is 7 ∼ 8 (Al-Omari and Fayyad, 2003). When HRT was short, pH rise enhanced denitrification, as indicated by the result of NO3-N under different HRT.
Intensified heterotrophic denitrification in constructed wetlands using four solid carbon sources: Denitrification efficiency and bacterial community structure
2018, Bioresource TechnologyCitation Excerpt :Whereas the effluent DO values of all CWs were <2 mg L−1 throughout the whole process. The high denitrification performance requires neutral or near neutral pH conditions, however, the effluent of CWs was accompanied by different degrees of pH reduction (Al-Omari and Fayyad, 2003). Moreover, the denitrification process required a DO concentration below 2 mg L−1 (Waki et al., 2018).
An innovative wood-chip-framework substrate used as slow-release carbon source to treat high-strength nitrogen wastewater
2017, Journal of Environmental Sciences (China)
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