以厌氧颗粒污泥为种泥,在SBR中培养出了好氧颗粒污泥,并研究有机负荷、含盐量对其稳定性的影响。结果表明:好氧颗粒污泥培养时间仅30 d,颗粒粒径约2 mm。有机负荷在1.8~4.0 kg COD/(m^3·d)范围内稳定性较好,COD、TN的去除效果随有...以厌氧颗粒污泥为种泥,在SBR中培养出了好氧颗粒污泥,并研究有机负荷、含盐量对其稳定性的影响。结果表明:好氧颗粒污泥培养时间仅30 d,颗粒粒径约2 mm。有机负荷在1.8~4.0 kg COD/(m^3·d)范围内稳定性较好,COD、TN的去除效果随有机负荷增加而略有提高。含盐质量分数为1%时,颗粒污泥仍保持一定的稳定性,增加到2.5%开始出现颗粒解体,COD、氨氮去除效果大幅降低;含盐质量分数增加到5%时,颗粒污泥解体现象、上浮现象有所缓解,COD、氨氮去除效果有所回升,分别稳定在70%、62%。展开更多
Reclaimed water has been widely applied in irrigation and industrial production.Revealing the behavior of emerging contaminants in the production process of reclaimed water is the first prerequisite for developing rel...Reclaimed water has been widely applied in irrigation and industrial production.Revealing the behavior of emerging contaminants in the production process of reclaimed water is the first prerequisite for developing relevant water quality standards.This study investigated 43 emerging contaminants,including 22 pharmaceuticals and personal care products(PPCPs),11 organophosphorus flame retardants(OPFRs),and 10 antibiotic resistance genes(ARGs)in 3 reclaimed wastewater treatment plants(RWTPs)in Beijing.The composition profiles and removal efficiencies of these contaminants in RWTPs were determined.The results indicated that the distribution characteristics of the different types of contaminants in the three RWTPs were similar.Caffeine,sul2 and tris(1-chloro-2-propyl)phosphate were the dominant substances in the wastewater,and their highest concentrations were 27104 ng/L,1.4×10^(7) copies/mL and 262 ng/L,respectively.Ofloxacin and sul2 were observed to be the dominant substances in the sludge,and their highest concentrations were 5419 ng/g and 3.7×10^(8) copies/g,respectively.Anaerobic/anoxic/oxic system combined with the membrane bioreactor process achieved a relatively high aqueous removal of PPCPs(87%).ARGs and OPFRs were challenging to remove,with average removal rates of 6.5%and 31%,respectively.Quantitative meta-analysis indicated that tertiary treatment processes performed better in emerging contaminant removal than secondary processes.Diethyltoluamide exhibited the highest mass load discharge,with 33.5 mg/d per 1000 inhabitants.Octocrylene and tris(2-ethylhexyl)phosphate posed high risks(risk quotient>1.0)to aquatic organisms.This study provides essential evidence to screen high priority pollutants and develop corresponding standard in RWTPs.展开更多
文摘以厌氧颗粒污泥为种泥,在SBR中培养出了好氧颗粒污泥,并研究有机负荷、含盐量对其稳定性的影响。结果表明:好氧颗粒污泥培养时间仅30 d,颗粒粒径约2 mm。有机负荷在1.8~4.0 kg COD/(m^3·d)范围内稳定性较好,COD、TN的去除效果随有机负荷增加而略有提高。含盐质量分数为1%时,颗粒污泥仍保持一定的稳定性,增加到2.5%开始出现颗粒解体,COD、氨氮去除效果大幅降低;含盐质量分数增加到5%时,颗粒污泥解体现象、上浮现象有所缓解,COD、氨氮去除效果有所回升,分别稳定在70%、62%。
基金the Major Science and Technology Program for Water Pollution Control and Treatment(No.2018ZX07111003)the National Natural Science Foundation of China(Grant No.41977142)+1 种基金the Key Technologies Research and Development Program(No.2019YFC1806104)the Fundamental Research Funds for the Central Universities(No.JD2006).
文摘Reclaimed water has been widely applied in irrigation and industrial production.Revealing the behavior of emerging contaminants in the production process of reclaimed water is the first prerequisite for developing relevant water quality standards.This study investigated 43 emerging contaminants,including 22 pharmaceuticals and personal care products(PPCPs),11 organophosphorus flame retardants(OPFRs),and 10 antibiotic resistance genes(ARGs)in 3 reclaimed wastewater treatment plants(RWTPs)in Beijing.The composition profiles and removal efficiencies of these contaminants in RWTPs were determined.The results indicated that the distribution characteristics of the different types of contaminants in the three RWTPs were similar.Caffeine,sul2 and tris(1-chloro-2-propyl)phosphate were the dominant substances in the wastewater,and their highest concentrations were 27104 ng/L,1.4×10^(7) copies/mL and 262 ng/L,respectively.Ofloxacin and sul2 were observed to be the dominant substances in the sludge,and their highest concentrations were 5419 ng/g and 3.7×10^(8) copies/g,respectively.Anaerobic/anoxic/oxic system combined with the membrane bioreactor process achieved a relatively high aqueous removal of PPCPs(87%).ARGs and OPFRs were challenging to remove,with average removal rates of 6.5%and 31%,respectively.Quantitative meta-analysis indicated that tertiary treatment processes performed better in emerging contaminant removal than secondary processes.Diethyltoluamide exhibited the highest mass load discharge,with 33.5 mg/d per 1000 inhabitants.Octocrylene and tris(2-ethylhexyl)phosphate posed high risks(risk quotient>1.0)to aquatic organisms.This study provides essential evidence to screen high priority pollutants and develop corresponding standard in RWTPs.
