曝气生物滤池_纳滤深度处理印染废水的研究_谢春生

曝气生物滤池—纳滤深度处理印染废水的研究谢春生1,黄瑞敏2,肖继波3,周媛媛2,卿海波2(1.浙江理工大学材料与纺织学院,浙江杭州310018;2.华南理工大学环境科学与工程学院,广东广州510640;3.浙江林学院环境科技学院,浙江杭州311300)摘要:采用曝气生物滤池—纳滤工艺对某印染厂废水处理站排放口出水进行再生回用处理,考察了处理效果。结果表明,在水力负荷为1.02m3/(m2h)时,曝气生物滤池对COD的去除率为31.4%;混凝沉淀和机械过滤的纳滤预处理工艺的出水浊度平均为1.64NTU,出水SDI值平均为4.1;纳滤系统的水回收率随运行时间的延长而下降,压力差则随运行时间的延长而上升;在进水TDS为3750～4280mg/L时,纳滤系统的平均脱盐率为96.1%;化学清洗后的水回收率可恢复至系统运行初期的94%,清洗前、后纳滤系统的脱盐率没有明显变化。组合工艺的出水水质可满足设计的回用水水质要求。关键词:印染废水;曝气生物滤池;纳滤;再生回用中图分类号:X703.1文献标识码:C文章编号:1000-4602(2007)15-0069-04基金项目:先进纺织材料与制备技术教育部重点实验室(浙江理工大学)优秀青年人才培养基金资助项目(2006QN16)StudyonAdvancedTreatmentofDyeingandPrintingWastewaterbyBAF/NanofiltrationProcessXIEChun-sheng1,HUANGRui-min2,XIAOJi-bo3,ZHOUYuan-yuan2,QINGHai-bo2(1.CollegeofMaterialsandTextile,ZhejiangScience-TechnologyUniversity,Hangzhou310018,China;2.CollegeofEnvironmentalScienceandEngineering,SouthChinaUniversityofTechnology,Guangzhou510640,China;3.SchoolofEnvironmentalTechnology,ZhejiangForestryUniversity,Hangzhou311300,China)Abstract:Biologicalaeratedfilter(BAF)/nanofiltration(NF)processwasusedfortheadvancedtreatmentofthetreatedeffluentfromadyeingandprintingfactory.Thepilot-scaleexperimentswerecar-riedoutandmainlyfocusedontheeffectofthisprocess.Theresultsshowthatwhentheinfluentloadis1.02m3/(m2h),theCODremovalrateinBAFis31.4%.Thecoagulationandconventionalfiltrationwerechosenasthepretreatmentprocessofnanofiltration.Afterthepretreatment,theaverageturbidityis1.64NTUandtheaverageSDInumberis4.1.Duringtheexperiment,thewaterrecoveryrateofnanofil-trationisslowlydecreasedandthepressuredifferenceisslowlyincreased.WhentheinfluentTDSrangesfrom3750to4280mg/L,theaveragedesalinationrateofnanofiltrationis96.1%.Afterchemicalcleaning,thewaterrecoveryratecanberestoredto94%ofthepreviousnumber,butthedesalinationratehasnodistinctvariation.Theeffluentqualityoftheprocesscanmeetthereuserequirementofdyeingandprintingfactory.69第23卷第15期2007年8月中国给水排水CHINAWATER＆WASTEWATERVo.l23No.15Aug.2007Keywords:dyeingandprintingwastewater;biologicalaeratedfilter;nanofiltration;recla-mationan