In order to make sure the water quality can reach the first-class A standard stipulated in the Pollutant Discharge Standard of Urban Sewage Treatment Plant, the bioaugmentation technology was adopted to improve the performance activated sludge. Compound microbial agents with high efficiency in degrading protein, fat and aniline ( consist of heterotrophic nitrifying aerobic denitrifying strains and denitrifying phosphorous accumulating bacteria ) was used to reduce total nitrogen ( TN ) , ammonia nitrogen ( NH3-N) and COD of swage containing food wastewater. The experimental results showed that the effluent water quality had been significantly improved after adding the compound bacteria in the aeration tank. The TN removal rate of the secondary settling tank reached 93. 48% , which was increased by nearly 70% on the original basis; the ammonia nitrogen removal rate was 83. 15% . Increased 60% more than the original basis; COD removal rate reached 91. 40% . After the compounding agent matures and forms a commensal flora with the indigenous microorganisms in the aeration tank, the bacteria were stopped to add for 2 months, and during this period, the sludge was controlled to continuously reduce the sludge concentration in the biochemical pool ( from 9 000 mg/L to 6 000 mg/L) . The final system TN, NH3-N, COD removal efficiency can be maintained at the above level, greatly reducing the energy consumption of the original system.%为改良活性污泥性能,采用生物强化技术,在含食品废水的污水处理厂曝气池中投加具有高效降解蛋白质、脂肪、苯胺的复合微生物菌剂(由异养硝化-好氧反硝化菌株以及反硝化聚磷菌组成) ,有效降低出水总氮( TN) 、氨氮( NH3-N) 、COD,使其水质稳定达到《城镇污水处理厂污染物排放标准》中规定的一级 A标准.实验结果表明:于曝气池投加复合菌剂后,出水水质有了很明显提升,二沉池出水TN去除率达到93. 48% ,在原有基础上提高近70% ;NH3-N去除率达83. 15% ,在原有基础上提高60%以上;COD去除率达到91. 40% .在复配菌剂生长成熟并和曝气池内土著微生物形成共生菌群后,停止加菌2个月,并在此期间控制回流污泥,从而将生化池中污泥质量浓度持续降低(从9 000 mg/L降低到6 000 mg/L左右).最终系统TN、NH3-N、COD能够稳定达到GB18918—2002规定的一级 A标准,大大减少了原系统运行能耗.
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