深水循环加压混凝沉淀除藻工艺研究  

Deep Water Circulation/Coagulation and Sedimentation Process for Cyanobacteria Removal

作　　者：鲁梦江[1] 丛海兵[1] 洪苏科 鄢琪[1] 郑全兴 王巍[1] 

机构地区：[1]扬州大学环境科学与工程学院,江苏扬州225127 [2]裕腾建设集团有限公司,江苏苏州215000 [3]扬州自来水有限责任公司,江苏扬州225009

出　　处：《中国给水排水》2017年第1期54-58,共5页China Water & Wastewater

基　　金：江苏省水利动力工程重点实验室项目(K12020);扬州市市校合作研究项目(2014-4);扬州市前瞻性研究计划项目(SQZ201430062);江苏省基础研究计划(自然科学基金)项目(BK20150456);江苏省高校自然科学研究项目(15KJD610006);扬州市重点研发计划(社会发展)项目(YZ2015072)

摘　　要：为提高水中蓝藻的混凝沉淀去除效果,采用深水循环井对水体进行预处理,使蓝藻气囊在深水压力作用下破裂,藻体失去气囊浮力,再经后续混凝沉淀去除。静态试验表明,随深水循环井深度的加大,混凝沉淀后各项出水指标浓度降低;当循环井深度为80 m、混凝剂[Al_2(SO_4)_3·18H_2O]投加量为30 mg/L时,对叶绿素a、COD_(Mn)和DOC的去除率分别为95.5%、62.1%和39%,出水浊度为1.35 NTU,较2 mg/L的NaClO预氧化混凝沉淀出水效果好且供水水质安全。动态试验进一步表明,深水循环混凝沉淀工艺对去除蓝藻是有效的,特别是对微囊蓝藻的去除尤为明显。In order to increase the removal efficiency of cyanobacteria by coagulation and sedimen- tation, the cyanobacteria-containing water was pretreated with the deep water circulation well. Under the pressure of the deep water, the gas vesicles of cyanobacteria were broken and the cyanobacterial cells lost buoyancy, which promoted the removal of cyanobacteria by coagulation and sedimentation. Static experi- mental results showed that with the increase of well depth, the effluent indices after coagulation and sedi- mentation decreased correspondingly. When the depth of the deep water circulation treatment was 80 m, and the Al2 （SQ）3 · 18H2O dose was 30 mg/L, the removal rates of chlorophyll-a, CODMn and DOC were 95.5%, 62.1% and 39%, respectively, and the effluent turbidity was 1.35 NTU, which indicated better and safe treatment effect compared with that by preoxidation （2 mg/L NaClO）/coagulation and sedimentation process. Dynamic experiments further indicated that the deep water circulation/coagulationand sedimentation process is effective for the removal of cyanobacteria, especially for the removal of Mi- crocystis.

关 键 词：深水循环 混凝沉淀 微囊藻 去除率 

分 类 号：X52[环境科学与工程—环境工程]