氨氮菌处理焦化废水中氨氮的实验研究

Study on Ammonia Removal of Coking Plant Wastewater by Ammonia Bacteria

文章采用专门的氨氮菌处理焦化废水中的氨氮和COD,处理流程为:原水先经MAP法预处理,再用氨氮菌处理,出水再经絮凝处理。MAP法即在pH为9.75时,按照最佳配比:MgC12 6H2O∶NH3-N∶Na2HPO4 12H2O=1.2∶1∶1投加药剂,原水氨氮去除率可达83.58%。氨氮菌处理时,最佳氨氮菌为AQ-01型,最佳实验条件为pH 8.0,温度25℃,当加菌量200 mL时,连续曝气25 h后,氨氮去除率达75.6%,COD去除率达97.2%。絮凝剂选择聚合硫酸铁,经絮凝处理最终出水氨氮值达到国家一级排放标准。

The paper focused mainly on ammonia and COD removal from coking plant wastewater by ammonia bacteria. The treatment process was the integrated processes of pre-treated physic-chemical treatment （mainly by MAP） -- ammonia bacteria treatment -- flocculation. When the pH is 9.75, app lying such chemicals as MgCl1·6H2O and Na2HPO4· 2H2O and with the ration of MgCI2,6H2O：NH3-N：Na2HPO·4l2H2O was controlled at 1.2：1：1, the NH3-N was removed to 83.58 %. Through experiments, it was found that the best ammonia bacteria was AQ-01conditions, and the best experiment conditions for the degradation of ammonia bacteria were determined： pH 8.0, temperature 25 ℃, bacteria input 200 mL. Treated under these best conditions, ammonia and COD removal efficiency could reach to 75.6 % and 97.2 %, respectively. At last, after flocculation with the polymer of iron sulfate, the NH3-N could met the Integrated wastewater discharge standard of China.