前置A_2NSBR工艺系统的启动特性研究

Start-up characteristics of the pre-A_2 NSBR Process

以实际低C/N生活污水(C/N为3.85)为研究对象,重点研究了按照厌氧/缺氧/硝化时序运行的新型前置A_2NSBR工艺系统的启动特性.结果表明,采用除磷A_2SBR和硝化N-SBR先单独启动后耦合运行的方式能够实现快速启动,系统在N-SBR中维持稳定的硝化,在A2SBR中实现了以NO_3^-N为电子受体的反硝化除磷,系统连续运行45d后达到稳定,各项出水指标COD、NH_4^+-N、TN、TP平均值分别为33.82mg/L、0.85mg/L、13.56mg/L,、0.3mg/L,相应的去除率分别为84.31%、98.41%、76.81%、93.87%,各项出水指标达到国家《城镇污水处理厂污染物排放标准GB 18918-2002》中的一级A标准.FISH实验表明,PAOs成为A_2SBR系统中的优势菌群,占全菌比例上升到14.77%.

The start-up characteristics of the pre-A2NSBR (anaerobic/anoxic/aerobic nitrification) system wereinvestigated to treat low C/N municipal wastewater (C/N=3.85). The start-up of the system could be quickly achieved bythe strategy that the A2 SBR and the N-SBR was first started separately then was operated jointly, the nitrification waswell achieved in the N-SBR, and denitrifying phosphorus removal was realized in the A2 SBR with the NO3-N as theelectronic accepter. The effluent quality index of COD、NH4+-N、TN、TP was 33.82mg/L、0.85mg/L、13.56mg/L、0.3mg/L,with corresponding removal efficiency was 84.31%、98.41%、76.81%、93.87%, respectively, which meet the first Adischarge standard in china (GB 18918~2002) after continuous operation of 45days. FISH confirmed that PAOs was thedominant bacteria in the pre-A2 NSBR system and accounted for 14.77% of the total bacteria.