TY - JOUR
T1 - Co-treatment of reject water from sludge dewatering and supernatant from sludge lime stabilization process for nutrient removal
T2 - A cost-effective approach
AU - Hu, Dalong
AU - Zhou, Zhen
AU - Niu, Tianhao
AU - Wei, Haijuan
AU - Dou, Weixiao
AU - Jiang, Lu Man
AU - Lv, Yan
N1 - Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2017/1/1
Y1 - 2017/1/1
N2 - A cost-effective method for reject water treatment by reusing supernatant from sludge lime stabilization (SLS) process was investigated to achieve simultaneous COD, nitrogen and phosphorus removal. SLS supernatant was characterized as an alkaline wastewater containing high concentrations of calcium ion, alkalinity, biodegradable COD and ammonium nitrogen. Dosing SLS supernatant into a membrane bioreactor for reject water treatment enhanced COD and phosphorus reduction by 105.1% and 184.6%, increased pH of mixed liquor, formed large sludge flocs and mitigated membrane fouling. Illumina-MiSeq sequencing showed that SLS supernatant addition also increased microbial abundance and biodiversity, enriched nitrifying biomass, and converted predominant ammonia oxidizing genera from Nitrosospira to Nitrosomonadaceae_uncultured and Nitrosomonas. The combined treatment of reject water using a proposed step-feeding oxic/anoxic/oxic process can utilize biodegradable COD in SLS supernatant for denitrification, fully compensate alkalinity for nitrification, and save costs of phosphorus precipitants, external carbon and alkalinity. The results suggest that co-treatment of reject water and SLS for nutrient removal was technically and economically effective.
AB - A cost-effective method for reject water treatment by reusing supernatant from sludge lime stabilization (SLS) process was investigated to achieve simultaneous COD, nitrogen and phosphorus removal. SLS supernatant was characterized as an alkaline wastewater containing high concentrations of calcium ion, alkalinity, biodegradable COD and ammonium nitrogen. Dosing SLS supernatant into a membrane bioreactor for reject water treatment enhanced COD and phosphorus reduction by 105.1% and 184.6%, increased pH of mixed liquor, formed large sludge flocs and mitigated membrane fouling. Illumina-MiSeq sequencing showed that SLS supernatant addition also increased microbial abundance and biodiversity, enriched nitrifying biomass, and converted predominant ammonia oxidizing genera from Nitrosospira to Nitrosomonadaceae_uncultured and Nitrosomonas. The combined treatment of reject water using a proposed step-feeding oxic/anoxic/oxic process can utilize biodegradable COD in SLS supernatant for denitrification, fully compensate alkalinity for nitrification, and save costs of phosphorus precipitants, external carbon and alkalinity. The results suggest that co-treatment of reject water and SLS for nutrient removal was technically and economically effective.
KW - Fouling
KW - Membrane bioreactor
KW - Microbial community
KW - Reject water
KW - Sludge lime stabilization
UR - https://www.scopus.com/pages/publications/84985995159
U2 - 10.1016/j.seppur.2016.08.032
DO - 10.1016/j.seppur.2016.08.032
M3 - 文章
AN - SCOPUS:84985995159
SN - 1383-5866
VL - 172
SP - 357
EP - 365
JO - Separation and Purification Technology
JF - Separation and Purification Technology
ER -