Biological nitrogen removal from coke plant wastewater with external carbon addition

被引:59
作者
Lee, MW
Park, JM
机构
[1] Pohang Univ Sci & Technol, Sch Environm Engn, Dept Chem Engn, Pohang 790784, South Korea
[2] Res Inst Ind Sci & Technol, Div Energy & Environm Res, Pohang, South Korea
关键词
biological nitrogen removal system; coke plant wastewater; denitrification; carbon addition; nitrification; system stability;
D O I
10.2175/106143098X123444
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Coke plant wastewater containing high concentrations of ammonia and toxic compounds such as phenol and cyanide was treated using a biological nitrogen removal (BNR) system comprising carbon removal, nitrification, and dentrification stages. The objective of this study was to investigate the feasibility of complete ammonia removal from the coke plant wastewater using a sequential BNR process with external carbon addition. Sodium acetate was introduced as an external carbon source to the denitrification stage after oxidation of phenol and other carbonaceous compounds in the carbon-removal stage. The efficiency of denitrification was strongly affected by the loading rate of the external carbon source, and its optimal rate was determined based on the ratio of chemical oxygen demand to nitrate- and nitrite-nitrogen (COD:NOx-N) of the denitrification stage. The overall removal efficiency of major soluble pollutants in the wastewater was greater than 95% in the BNR system. When a step input of phenol was introduced to check the stability of the overall system, the nitrification was markedly inhibited because of the incomplete degradation of phenol in the carbon-removal stage. However, after this brief inhibition, the nitrification stage recovered to its normal efficiency within 18 days.
引用
收藏
页码:1090 / 1095
页数:6
相关论文
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