化学生物絮凝工艺污泥回流对污染物的絮凝效果研究  

Flocculation Characteristics of the Return Sludge in Chemical-Biological Flocculation Process

作　　者：张志斌[1,2,3] 赵建夫[2] 夏四清[2] 张学杨[1] 尹萌萌[1] 王学江[2] 王荣昌[2] 

机构地区：[1]山东建筑大学市政与环境学院,济南250101 [2]同济大学污染控制与资源化研究国家重点实验室,上海200092 [3]山东大学生命科学学院,济南250100

出　　处：《环境科学》2009年第3期840-844,共5页Environmental Science

基　　金：国家高技术研究发展计划(863)项目(2002AA601320);山东省环保局重点科技项目(2006043)

摘　　要：采用化学生物絮凝(CBF)工艺处理上海市城市污水,通过停止加药试验、不同污泥回流比模拟试验、污泥胞外聚合物组分及含量的分析测定,研究分析污泥回流对污染物去除效果的影响.结果表明,CBF的回流污泥具有较强的污染物去除能力,其携带的化学药剂可以增强系统抗磷酸盐冲击负荷能力,停止PAFC药剂投加期间,其COD去除率基本维持在50%以上,PO43-、TP去除率呈现逐渐缓慢下降的趋势.化学药剂投加是CBF实现良好泥水分离效果的重要因素.CEPT工艺剩余污泥VSS中的EPS含量仅为17.24 mg/g,而CBF工艺VSS中的EPS含量高达145.89 mg/g,其微生物活性较高,生物絮凝能力较强.化学强化一级工艺(CEPT)剩余污泥中药剂的絮凝性能较差,其对TP和COD的去除能力随污泥回流比提高而显著降低,而由于存在生物絮凝作用,CBF系统的污泥具有较强的絮凝性能.化学生物絮凝工艺是一种化学与生物协同作用的污水强化一级处理工艺.The chemical-biological flocculation （CBF） process was used to treat municipal wastewater in Shanghai, and the effect of its return sludge on pollutant removal was studied through Stopping chemical addition, simulating different return sludge ratio, and analyzing extracellular polymeric substances （EPS）. The results show that the return sludge in CBF exhibits strong pollutant removal capability, and chemical in its return sludge can further TP removal and enhance CBF＇s adaptability to the influent TP impulse. After stopping PAFC（ Al2O：10.8%, Fe2O3 ： 1.8% ） addition, COD removal efficiency is achieved at about 50%, and removal rates of PO^- and TP gradually decline. It is also found that chemical addition plays an important role in promote sludge sedimentation in CBF. EPS extracted from CBF is 145.89 mg/g, while EPS from CEPT is only 17.24 mg/g, which indicates that there is strong biological flocculation behavior in CBF. With the increase of return sludge ratio, TP and COD removal efficiencies decrease in CEPT, which reveals that chemical in waste sludge has poor flocculation capability, while CBF return sludge exhibits good flocculation behavior due to its biological flocculation. Chemical flocculation and biological flocculation work collaboratively in CBF process.

关 键 词：化学生物絮凝(CBF)工艺 化学强化一级(CEPT)工艺 回流污泥 生物絮凝 

分 类 号：X703.1[环境科学与工程—环境工程]