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Chen Z.,South China University of Technology | Chen Z.,The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters | Wang X.,South China University of Technology | Wang X.,The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters | And 5 more authors.
Bioresource Technology | Year: 2016

Controlling of low dissolved oxygen (DO) levels (0.1–0.5 mg/L), a cost-effective strategy, was applied to a pilot-scale anoxic-oxic-oxic-anoxic process for partial nitrification and denitrification of mature landfill leachate. High ammonium removal efficiency, stable nitrite accumulation rate and total nitrogen removal efficiency was higher than 95.0%, 90.0% and 66.4%, respectively, implying potential application of this process for nitrogen removal of mature landfill leachate. Efficient nitrite accumulation in the first oxic reactor depended on low DO conditions and sufficient alkalinity. However, operational limit was mainly decided by actual hydraulic retention time (AHRT) of the first oxic reactor and appeared with AHRT less than 13.9 h under DO of 0.3–0.5 mg/L. High-throughput sequencing analysis demonstrated significant change of bacterial diversity in the first oxic reactor after a long-term operation and dominant bacteria genus Nitrosomonas was shown to be responsible for NH4 +-N removal and nitrite accumulation under low DO levels. © 2016 Source


He Y.,South China University of Technology | Wang X.,South China University of Technology | Xu J.,South China University of Technology | Yan J.,South China University of Technology | And 3 more authors.
Bioresource Technology | Year: 2013

A combined process including integrated ozone-BAFs (ozone biological aerated filters) and membrane filtration was first applied for recycling textile effluents in a cotton textile mill with capacity of 5000m3/d. Influent COD (chemical oxygen demand) in the range of 82-120mg/L, BOD5 (5-day biochemical oxygen demand) of 12.6-23.1mg/L, suspended solids (SSs) of 38-52mg/L and color of 32-64° were observed during operation. Outflows with COD≤45mg/L, BOD5≤7.6mg/L, SS≤15mg/L, color≤8° were obtained after being decontaminated by ozone-BAF with ozone dosage of 20-25mg/L. Besides, the average removal rates of PVA (polyvinyl alcohol) and UV254 were 100% and 73.4% respectively. Permeate water produced by RO (reverse osmosis) could be reused in dyeing and finishing processes, while the RO concentrates could be discharged directly under local regulations with COD≤100mg/L, BOD5≤21mg/L, SS≤52mg/L, color≤32°. Results showed that the combined process could guarantee water reuse with high quality, and solve the problem of RO concentrate disposal. © 2013 Elsevier Ltd. Source


Cui J.,South China University of Technology | Wang X.,South China University of Technology | Yuan Y.,South China University of Technology | Guo X.,South China University of Technology | And 2 more authors.
Chemical Engineering Journal | Year: 2014

In this study, combined ozone oxidation and biological aerated filter (BAF) processes treating cyanide containing electroplating wastewater was investigated. The combined process of first BAF-ozone-second BAF (BAF1-O3-BAF2) was proved the optimal combined way. Under the optimal condition of 100mg/L ozone dosage, BAF1 HRT (hydraulic retention time) 9h and BAF2 HRT 6h, the CN-, COD (chemical oxygen demand), Cu2+ and Ni2+ removal efficiencies were 99.7%, 81.7%, 97.8% and 95.3%, respectively and the effluent CN-, COD, Cu2+ and Ni2+ concentrations of 0.16mg/L, 55.0mg/L, 0.38mg/L and 0.41mg/L, respectively satisfied the discharge standard for electroplating (China). The results show that BAF1 can tolerate higher cyanide toxicity than some other bioreactors. Furthermore, the addition of glucose into raw electroplating wastewater (EPWW) could increase contaminants removal efficiencies of BAF1. Cyanide compounds of EPWW could be used as the nitrogen source for the microorganisms. © 2013 Elsevier B.V. Source

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