加压预处理与预氧化强化混凝处理太湖蓝藻水中试比较研究  

Pilot scale comparative experiments on pressurization pretreatment and preoxidation to enhance coagulation for removing Cyanobacteria in Taihu Lake

作　　者：钱爱娟[1] 丛海兵[1] 鄢琪[1] 丁凯耘 刘玉娇[1] 徐思涛[1] 费广武 

机构地区：[1]扬州大学环境科学与工程学院,江苏扬州225127 [2]江苏鑫东方环保设备科技有限公司,江苏扬州225807

出　　处：《供水技术》2016年第3期13-20,共8页Water Technology

基　　金：江苏省科技支撑计划项目(BE2014681);扬州市校合作研究项目(2014-4);扬州市"绿杨金凤计划"项目

摘　　要：为提高太湖水中蓝藻的混凝沉淀去除效果,分别采用加压预处理和化学预氧化处理工艺,再进行混凝沉淀处理。通过动态试验对比研究了加压预处理和预氧化强化混凝沉淀去除藻类的效果和水质安全性,并进行了经济分析。结果表明,短时间加压0.7 MPa后进行混凝沉淀,出水浊度为0.6~1.37 NTU,叶绿素a和COD_(Mn)去除率分别达到(97.64~99.34)%和(62.54~68.39)%;2 mg/L氯预氧化工艺沉淀出水浊度为21.4 NTU,叶绿素a和COD_(Mn)去除率分别为82.2%和39.87%;2 mg/L高锰酸钾预氧化工艺沉淀出水浊度为3.22 NTU,叶绿素a和COD_(Mn)去除率分别为94.71%和63.44%。同时,相对于预氧化工艺,加压预处理工艺可减少后续工艺藻毒素的释放和消毒副产物的生成。采用加压预处理工艺会使能耗增加0.002 3 k W·h/m^3,但可节省混凝剂投量40%,且节省了预氧化剂费用,在处理效果、水质安全性、处理成本等方面明显优于化学预氧化工艺。In order to improve the effect of removal of Cyanobacteria in Taihu Lake, pressurization and chemical preoxidation were applied respectively, which followed by coagulation and sedimentation. The dynamic test was performed to compare the effect and safety of water quality when Cyanobacteria removal by pressurization, sedimentation process and preoxidation coagulation and sedimentation process, and the economic analysis was done also. The results showed that after a short-term pressurization of 0.7 MPa, follwing coagulation and sedimentation with 30 mg/L of A12 （SO4 ）3 · 18H20 treatment, the outflow turbidity was 0.6 to 1.37 NTU, the removal rates of Chlorophyll-a and CODMn were 97.64% to 99.34% and 62.54% to 68.39%, respectively. While after preoxidation by 2 mg/L chlorine, following coagulation and sedimentation, the outflow turbidity was 21.4 NTU, the removal rates of Chlorophyll-a and CODMn were 82.2% and 39.87%. After preoxidation by 2 mg/L potassium permanganate, following coagulation and sedimentation, the outflow turbidity was 3.22 NTU, the removal rates of Chlorophyll-a and CODMn were 94.71% and 63.44%. Meanwhile pressurization coagulation sedimentation process could reduce the release of mierocystins in the following process and formation of DBPs relative to enhanced coagulation sedimentation process by preoxidation. Energy consumption of pressurization pretreatment would increase 0.002 3 kW·h/m3, but it could reduce 40% coagulants and the preoxidation would not be necessary anymore. Above all, pressurization, coagulation and sedimentation process was much better than preoxidation, coagulation and sedimentation process for the removal of Cyanobacteria in all the aspects, such as treatment effect, the safety of water quality and treatment cost.

关 键 词：蓝藻 加压 预氧化 混凝沉淀 水质安全 

分 类 号：TU991.2[建筑科学—市政工程]