基于污水厂监测数据的反硝化脱氮影响因素分析

以污水厂长序列运行数据为基础,反推脱氮实际影响因素,开展反硝化脱氮试验。结果表明,在2019年4月前后TN出水平均浓度降低58%;受季节和污水厂升级改造影响,温度由15℃升高至25℃,混合液悬浮固体质量浓度(MLSS)由4300 mg/L增至8000 mg/L,活性污泥成分增加,脱氮效果提升;BOD 5/TN和pH值等变化相对稳定,温度、MLSS是影响该污水处理厂反硝化脱氮的主要因素;当反应温度为(25±5)℃,pH值为7.5±0.2,MLSS为4800 mg/L时,反硝化脱氮效果最佳,硝酸盐氮去除率达91%。

Analysis on Influencing Factors of Denitrification based on Monitoring Data from Sewage Plant

Based on the long-term operation data from a sewage plant,the actual influencing factors of denitrification were studied through denitrification experiments.The results showed that after treatment,the average concentration of total nitrogen in water decreased by 58%around April,2019.Influenced by seasonal change and the upgrading and rebuilding of the sewage plant,the temperature increased from 15℃to 25℃,mixed liquor suspended solids(MLSS)increased from 4300 mg/L to 8000 mg/L,the component of activated sludge and the effect of denitrification increased.The changes of BOD 5/TN and pH value were relatively stable.Temperature and MLSS were the main factors affecting denitrification.When the reaction temperature was(25±5)℃,pH value was 7.5±0.2,and MLSS was 4800 mg/L,the denitrification effect was the best,the removal rate of nitrate nitrogen reached 91%.