Comparison between anaerobic-anoxic-oxic and anoxic-oxic systems for coke plant wastewater treatment
- Nanyang Technological Univ. (Singapore). School of CSE
- Tsinghua Univ., Beijing (China). Dept. of Environmental Engineering
Coke plant wastewater produces severe pollution throughout China because coal is the main energy resource. The anoxic-oxic (A{sub 2}-O) system can be used to treat this type of wastewater for simultaneous removal of NH{sub 3}-N and COD. A comparative study between an anaerobic-anoxic-oxic (A{sub 1}-A{sub 2}-O) system and an A{sub 2}-O system for coke plant wastewater treatment under the same operational conditions was undertaken to examine removal efficiencies of COD and NH{sub 3}-N, denitrification performance, and transformation of organic pollutants in each system. The experimental results showed that the A{sub 1}-A{sub 2}-O system was comparatively more effective not only in nitrification but also in denitrification performance. The total NH{sub 3}-N removal efficiency and the anoxic No{sub x}-N removal rate of the A{sub 1}-A{sub 2}O system were about 20% higher and more than twice that of the A{sub 2}-O system, respectively. Coke plant wastewater subjected to anaerobic treatment resulted in less inhibitory effect on the subsequent nitrification process, and provided a more biodegradable and suitable carbon substrate for denitrifying bacteria. The anaerobic stage played an important role in nitrogen reduction in coke plant wastewater treatment.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 538177
- Journal Information:
- Journal of Environmental Engineering, Journal Name: Journal of Environmental Engineering Journal Issue: 9 Vol. 123; ISSN 0733-9372; ISSN JOEEDU
- Country of Publication:
- United States
- Language:
- English
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