焦化废水生物脱氮除碳技术研究

An technical study on biological removal of N and COD in coke wastewater

本文通过半生产性试验，对焦化废水的生物脱氮除碳处理技术进行了研究．结果表明单相活性污泥Ａ／Ｏ法可以同时将废水中的氨氮及有机物去除．当进水ＣＯＤ＜２０００ｍｇ／Ｌ，ＮＨ＋４－Ｎ≤３００ｍｇ／Ｌ，ＣＮ－＜１０ｍｇ／Ｌ时，出水ＣＯＤ、ＮＨ＋４－Ｎ、ＣＮ－均可达到ＧＢ１３４５６—９２的标准，水力停留时间以３０ｈ为宜，其中缺氧段１２ｈ，好氧段１８ｈ，回流比为３～５．

Technology of simultaneous removal of N and COD in coke wastewater was studied in this paper. It shows that anoxic/aerobic activated sluge process can meet the demands of simultanious biological removal of N and COD in coke wastewater. When the concentration of COD, NH + 4 N, and CN - is less than 200 mg/L, 300 mg/L, 10 mg/L respectively in influence, the quality of effluence can meet the criteria of GB 13456—92. In the experiment ,the optimum hydraulic retention time (HRT) is 30h, in which 12h in anoxic stage and 18h in aerobic stage; the optimum mixture recycle rate is 3～5.