BioDopp中试系统强化脱氮除磷及微生物菌群分析

Enhanced nitrogen and phosphorus removal and microbial analysis of BioDopp process in pilot scale

为论证存量市政污水处理厂同时提标和扩容的可行性,以北京市某低C/N的生活污水处理中心提标扩容改造项目为依托,采用基于BioDopp工艺的IFAS-微氧AO技术构建了中试系统,考察了该工艺对有机物和氮磷营养物的去除效能及其微生物菌群特征,并核算了其经济效益.试验结果表明,基于实际污水污染物浓度较低,通过逐渐提高处理水量以提高负荷的启动策略是可行的.中试装置启动8d后,系统稳定运行,出水COD、NH_(3)-N、TN和TP浓度分别为18.9,0.4,8.3和0.7mg/L.高通量测序结果表明,该工艺强化了对功能菌,尤其是反硝化聚磷菌的富集,其总相对丰度7.6%,达接种活性污泥的23.6倍.该系统HRT 16.6h,仅为该污水处理中心原工艺(27.2h)的61.0%,节地优势显著;生物除磷效率高,节省药剂投加成本;且微氧控制和空气提推回流大幅降低了污水处理的曝气和回流能耗,由此可见,BioDopp工艺可用于紧凑型污水处理厂建设,是污水处理厂高效节能减碳利器.

In order to demonstrate the feasibility of simultaneously upgrading and capacity expanding of existing municipal sewage treatment plants,taking a low C/N domestic sewage in Beijing as the treatment object,a pilot test system was constructed using IFAS combined with micro oxygen A/O technology based on BioDopp process.The removal efficiency of organic matter,nitrogen and phosphorus,and the characteristics of microbial community were investigated,and the economic benefits were calculated as well.The results show that the startup strategy of increasing the load by gradually increasing the treated water volume is feasible in view of the low pollutant concentration of the sewage.After only 8days of startup,the operation became stable and the effluent COD,NH_(3)-N,TN and TP concentration reached 18.9,0.4,8.3 and 0.7mg/L respectively.The results of high-throughput sequencing showed that the tested process enhanced the enrichment of functional bacteria,especially denitrifying phosphorus accumulating bacteria,and its total relative abundance reached 7.6%,which was 23.6times of that of the activated sludge inoculated.The HRT of the pilot system is 16.6h,which is only 61.0%of the original process(HRT~27.2h)of the sewage treatment plant.It can be seen that this process has significant advantages in land saving,high biological phosphorus removal efficiency,saving reagent cost,and greatly reducing the energy consumption of aeration and reflux by micro oxygen controlling and air lift reflux.Consequently,BioDopp process can be used for the construction of compact sewage treatment plant,which is an efficient energy-saving and carbon reduction tool for sewage treatment plant.