电解铁碳填料强化絮体污泥造粒及微生物群落研究

Enhancing floc sludge granulation and microbial community with electrolytic Iron-carbon filler

好氧颗粒污泥的形成速率是影响废水处理的关键,研究强化好氧颗粒污泥的启动具有现实意义。采用外接电源的序批式反应器(SBR),高径比(R_(H/D))为7.5,内接活性污泥和铁碳填料(施加0.6kg),以人工合成的废水为进水,分析运行过程中污泥形态、污染物去除性能、微生物群落变化及耦合工艺的机制。结果表明:60d后,有黄色的葫芦形(瓢形、花生形、梨形)颗粒生成;对废水中COD、TP和NH_(4)^(+)-N的平均去除率分别为90.44%、84.46%和93.20%;优势菌属为拜叶林克氏菌属(Beijerinckia,10.45%,固氮菌)、糖酵母属(Saccharimonadales,5.27%,反硝化菌)、动胶菌属(Zoogloea,38.81%)和聚磷菌(Candidatus_Accumulibacter,2.13%),间歇电解会使微生物菌群结构进化;电解有助于脱除填料外层的沉积物,释放微量的碳粒,加快好氧颗粒污泥的启动。增设外电解耦合铁碳填料的运行策略,可以有效地强化废水的脱碳除磷效果,也实现了不同类型微生物的富集。

The formation rate of aerobic granular sludge remains crucial in wastewater treatment.Enhancing the initiation of aerobic granular sludge holds practical significance.In the paper,an external power sequenced batch reactor(SBR)at a high aspect ratio(R_(H/D))of 7.5 and incorporating activated sludge and iron-carbon fillers(at O.6kg)were used,and synthetic wastewater were served as the influent to examine the sludge morphology,pollutant removal performance,microbial community shifts,and coupled process mechanisms during operation.The results showed that after 60days,yellow gourd-shaped(ladle-shaped,peanut-shaped,pear-shaped)particles were formed.The average rates of removal of COD,TP and NH_(4)^(+)-N in wastewater were 90.44%,84.46%and 93.20%,respectively.The dominant species were Bejerinckia(10.45%),unclassified_Saccharimonadales(5.27%),Zoogloea(38.81%)and Candidatus_Accumulibacter(2.13%).The intermittent electrolysis can causes the microbial flora structure to evolve.Electrolysis is helpful to remove sediments from the outer layer of filler,release trace carbon particles and accelerate the start-up of aerobic granular sludge.The operation strategy of adding external decoupling iron-carbon filler can effectively enhance the effect of removal of decarburization and phosphorus from wastewater,and also realize the enrichment of different types of microorganisms.