化学生物絮凝工艺的反应机理初探  

Analysis on Mechanism of the Chemical-Biological Flocculation Process

作　　者：张志斌[1] 赵建夫[2] 夏四清[2] 刘长青[2] 王学江[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

出　　处：《环境科学》2007年第5期993-996,共4页Environmental Science

基　　金：国家高技术研究发展计划(863)项目(2002AA601320);山东省环保局项目(2006032)

摘　　要：考察了化学生物絮凝工艺中的Zeta电位、颗粒物粒度分布和溶解性有机物的分子质量分级,并分别与化学强化一级工艺和初沉池进行了对比.研究表明,相同药剂投加量下,化学生物絮凝工艺和化学强化一级工艺的出水Zeta电位值基本相等,化学生物絮凝工艺的回流污泥所携带的化学药剂几乎不影响反应池内颗粒物的稳定状态,其中的生物作用是该工艺对污染物的絮凝效果优于化学强化一级工艺的关键因素.在化学生物絮凝工艺中,投加药剂仅对粒径>10μm颗粒物和分子质量>6ku溶解性有机物有较好的去除效果,而生物絮凝作用不但可以促进对大粒径颗粒物和大分子质量溶解性有机物的去除,而且对小粒径颗粒物和小分子质量溶解性有机物也有较好的去除,其出水中粒径>3μm的颗粒物被完全去除,分子质量为2-6ku的溶解性有机物的去除率也高达42.5%.Zeta potential, particle size distribution and molecular weight distribution of dissolved TOC were studied to elementarily disclose the mechanism of the chemical-biological floeeulation （CBF） process to treat municipal wastewater. Chemically enhanced primary treatment （CEPT） process and primary sedimentation tank process were taken as the parallel-compared wastewater treatment processes. The experimental results show that under the same dosage, Zeta potential of the CBF process effluent is equal to that of the CEPT process, which indicates that floeeulant in return sludge does not change the stabilization of particles in CBF reactor, and the biological floeeulation is the key reason for CBF is superior to CEPT. In CBF process, good removal results are achieved for particles 〉 10μm and dissolved TOC with molecular weight 〉 6 ku by chemical dosage, and biological floeeulation can not only promote the removal of particles 〉 10μm and dissolved TOC with molecular weight 〉 6 ku, but also have high capacity to remove small particles and dissolved TOC with small molecular weight, with the results that particles 〉 3μm are removed completely and TOC with molecular weight of 2 - 6 ku are removed by 42.5%.

关 键 词：化学生物絮凝工艺 ZETA电位 颗粒物粒度分布 分子质量分级 

分 类 号：X703.1[环境科学与工程—环境工程]