Sedimentation effect of flocculant PAC on bacteria and phage in the effluent of sewage treatment system

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摘要:

为进一步提高反应器的处理效率,减少功能微生物的流失,采用向SBR反应器出水中外加絮凝剂PAC,并将絮凝沉淀的微生物返回反应器的方法,来探究该工艺对污水处理反应器处理效果的影响.通过试验得出絮凝剂的添加量为质量浓度50 mg/L时,反应器处理效果最佳.在进水COD,N,P分别为质量浓度400 mg/L和35mg/L以及10mg/L时,COD,N,P的去除效率分别为95.2%、94.2%、94.7%,与单纯的SBR工艺相比,处理效果分别提升了48.1%、43.6%、54.7%.对出水中微生物的显微计数结果显示细菌及噬菌体能很好地被絮凝剂沉降下来,平均沉降率分别为50.18%和21.40%.因此,将絮凝剂沉降下来的微生物再次返回反应器中确实更好地保留功能微生物,改善污泥性状,进而提高污水处理效果.

To improve the efficiency of waste water treatment and reduce the loss of functional microorganisms,PAC was added to the effluents of an SBR reactor,and the microbes which were flocculated were refluxed into the reactor.The results indicated that the optimal concentration of PAC was 50 mg/L for the system.When the COD,N,P were 400 mg/L,35 mg/L and10 mg/L,the removal of COD,N and P was 95.2%,94.2% and 94.7% respectively,which were 48.1%,43.6% and 54.7%higher than the controls.The counts of phage and bacteria in the effluents were enumerated by using fluorescent staining methods under a laser confocal microscopy.The results demonstrated that the phage and bacteria could be settled very well by flocculant.The average settling rate of bacteria and bacteriophages is 50.2%and 21.4%,respectively.Therefore,the addition of flocculant can settle microorganisms very well in effluents,and the backflow of the microbes can retain functional microorganisms and improve sludge properties,thereby improving the sewage treatment effect.

作者:

胡虎杨清香

Liu Qingling;Wang Kaikai;Wu Shan(Department of Chemistry and Chemical Engineering,Xinxiang University,Xinxiang 453000,China)

机构地区:

betway官方app 生命科学学院

出处:

《betway官方app 学报：自然科学版》 CAS 北大核心 2018年第5期97-102,共6页

基金:

国家自然科学基金资助(NSFC 21477035)

关键词:

序批式反应器活性污泥噬菌体絮凝剂

purine isothiocyanate phase transfer catalyst