预压力混凝沉淀除藻工艺中DOC变化规律研究  

Variation of Water DOC During the Process of Pre-pressure and Coagulation Sedimentation Treatment

作　　者：陈雯婧[1] 丛海兵[1] 徐亚军[1] 王巍[1] 蒋新跃[1] 刘玉娇[1] 

机构地区：[1]扬州大学环境科学与工程学院,扬州225127

出　　处：《环境科学》2014年第7期2579-2584,共6页Environmental Science

基　　金：国家自然科学基金项目(51178408);扬州市"绿扬金凤计划"项目

摘　　要：为了探讨预压力混凝沉淀除藻工艺是否会使藻细胞破裂,导致水中溶解性有机物（DOC）增加,进而优化压力作用方式,得到安全、高效的预压力除藻工艺,实验研究了预压力、预氧化技术处理含藻水时DOC的变化,以及水中相对分子质量分布,并研究了混凝沉淀后藻类、浊度、DOC的去除效果.结果表明,在0.5-0.8 MPa压力作用后,水中DOC没有增加,反而减少,且有机物相对分子质量减小.而高锰酸钾与次氯酸钠预氧化均会导致DOC增加,相对分子质量分布没有明显变化.预压力混凝沉淀后藻类去除率96.23%;DOC去除率29.11%,高于预氧化混凝沉淀工艺10%-30%.The aim of the study was to explore whether the pre-pressure and coagulation sedimentation process would result in algal cell disruption,leading to increased dissolved organic carbon（ DOC） in water,based on which,the pressure application mode would be optimized and safe and efficient pre-pressure algae removal process would be obtained. The changes in DOC during the process of prepressure and preoxidation treatment,the distribution of molecular weight in water as well as the removal efficiency of algae,turbidity and DOC after coagulation and sedimentation were investigated. The results showed that the DOC in water did not increase but decreased,and the molecular weight decreased after treated with 0. 5-0. 8 MPa pressure. While KMnO4and NaClO pre-oxidation both increased the DOC,in the meanwhile,the distribution of molecular weight showed no obvious change. After the pre-pressure coagulation and sedimentation process,the removal rate of algae was 96. 23% and that of DOC was 29. 11%,which was by 10%-30%higher than the rate of pre-oxidation coagulation and sedimentation process.

关 键 词：蓝藻 预压力 预氧化 混凝沉淀 溶解性有机碳 相对分子质量 

分 类 号：X52[环境科学与工程—环境工程]