SUNXiao,JIANGJie,WANGQiang,et al.Effect of Suspended Carrier on Microbial Community in A2O System in a Full-scale Wastewater Treatment Plant[J].China Water & Wastewater,2022,38(7):63-68.
大型污水厂中填料对A2O系统微生物种群的影响
- Title:
- Effect of Suspended Carrier on Microbial Community in A2O System in a Full-scale Wastewater Treatment Plant
- Keywords:
- municipal wastewater; suspended carrier; moving bed biofilm reactor; A2O process; biological nitrogen removal; microbial community
- 摘要:
- 上海某污水处理厂采用移动床生物膜反应器（MBBR）与传统厌氧/缺氧/好氧（A2O）耦合工艺进行提标改造，通过在原有A2O工艺的缺氧池和好氧池中投加悬浮填料，提高脱氮效率，出水水质执行国家一级A标准。填料挂膜半年后，分别测定A2O-MBBR和A2O系统中活性污泥的硝化和反硝化效能，发现前者的硝化速率和反硝化速率分别是后者的1.63和1.65倍，此外，A2O-MBBR系统中好氧池的填料使硝化速率又升高了1倍。采用高通量测序技术分析系统中的微生物群落结构，发现在纲水平上主要富集了Acidobacteria（16.69%）、Betaproteobacteria（14.04%）和Gammaproteobacteria（11.61%），在属水平上主要富集了Candidatus_Microthrix（7.30%）、norank_f__Saprospiraceae（4.25%）和Flavobacterium（3.01%）。对两种工艺进行微生物种群LEfSe线性判别分析，发现A2O-MBBR系统内富集了大量脱氮功能菌，悬浮填料强化了硝化和反硝化作用。
- Abstract:
- The moving bed biofilm reactor (MBBR) and conventional anaerobic/anoxic/aerobic (A2O) coupling process were applied to upgrade a wastewater treatment plant in Shanghai. The nitrogen removal efficiency was improved by adding suspended carriers in the anoxic and aerobic tanks of the original A2O process, and the effluent quality was required to meet the first level A criteria specified in the national discharge standard. After half a year, the nitrification and denitrification efficiencies of activated sludge in A2O-MBBR system and A2O system were measured respectively, and it was found that the nitrification rate and denitrification rate of the former were 1.63 times and 1.65 times of the latter, respectively. In addition, the suspended carriers of aerobic tank in A2O-MBBR system increased the nitrification rate by one time. The microbial community of the system was analyzed by high-throughput sequencing. The dominant classes were Acidobacteria (16.69%), Betaproteobacteria (14.04%) and Gammaproteobacteria (11.61%), and the dominant genera were Candidatus_Microthrix (7.30%), norank_f__Saprospiraceae (4.25%) and Flavobacterium (3.01%). The microbial communities of the two processes were analyzed by LEfSe linear discriminant analysis. It was found that a large number of functional bacteria with denitrification ability were enriched in the A2O-MBBR system, and the nitrification and denitrification were enhanced by the suspended carriers.
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