Treatment of mixed chemical wastewater by a two-stage A/O process for elimination of COD nitrogen and toxic matters

• Autorzy: Du P. , Li W. , Liang Z. , Chen Y. , Yang S. , Yan F.
• Języki publikacji: EN

Abstrakty

EN

In our work a two-stage A/O system consisting of two independent A/O subsystems was used to remove high concentrations of COD, nitrogen, and toxic matter from mixed wastewater discharged by a comprehensive chemical group. The mixed liquid return was not adopted, and the sludge return ratio was kept at a high value of 100-200% to maintain high usable activated sludge concentration. Adequate NaHCO₃ was added to keep the influent alkalinity/KN ratio around 7.14 to 1. The system was running stably during the whole experimental period. Subsystem one obtained high COD and organic nitrogen removal capability without being influenced by the increasing COD loading. 87.6% COD was removed and 75.7% org-N was transformed to NH₄⁺-N. Due to the low COD/KN ratio created by subsystem one, the nitrification efficiency of subsystem two reached a high value of 92.1%. Besides, aerobic biological oxidation of oxic tank one showed excellent ability on toxic matter elimination. The acute toxicity of the whole system dropped from 0.165 to 0.042 mg HgCl₂/L. It has been proven by this study that, using the two-stage A/O system with sludge return only to treat COD nitrogen and toxic matters, laden mixed wastewater from comprehensive chemical groups may be feasible.

• Wydawca: -
• Czasopismo: Polish Journal of Environmental Studies
• Rocznik: 2013
• Tom: 22
• Numer: 1
• Opis fizyczny: p.85-91,fig.,ref.

Twórcy

autor

Du P.

• Institute of Environmental Science and Technology, Zhejiang University, Hangzhou 310029, P. R. China
• Changye Environmental Protection Group Co., Ltd.

autor

Li W.

• Institute of Environmental Science and Technology, Zhejiang University, Hangzhou 310029, P. R. China
• Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety, Hangzhou 310029, P. R. China

autor

Liang Z.

• Institute of Environmental Science and Technology, Zhejiang University, Hangzhou 310029, P. R. China

autor

Chen Y.

• Institute of Environmental Science and Technology, Zhejiang University, Hangzhou 310029, P. R. China
• Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety, Hangzhou 310029, P. R. China

autor

Yang S.

• Institute of Environmental Science and Technology, Zhejiang University, Hangzhou 310029, P. R. China

autor

Yan F.

• Institute of Environmental Science and Technology, Zhejiang University, Hangzhou 310029, P. R. China

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