次氯酸钠对海水淡化超滤工艺产水影响研究_张敬东

工业用水与废水INDUSTRIALWATER&WASTEWATERVol.37No.3Jun.,2006次氯酸钠对海水淡化超滤工艺产水影响研究摘要:采用超滤技术预处理海水,在进水中加入消毒剂次氯酸钠可以控制给水系统里的微生物生长。通过控制其它条件不变的情况下,逐步调节次氯酸钠投加量,考虑产水和运行状况,确定最佳投加量。结果表明适当的加药量会使超滤产水水质得到一定的提高,如SDI值降低0.2～0.7,胶硅的质量浓度降低0.5mg/L,CODMn的质量浓度降低0.7mg/L,pH值有微小上升,而铁的质量浓度上升约12μg/L。过大的NaClO加药量会使得超滤产水水质变差。试验得出,对于试验地区的海水水质,海水中次氯酸钠的投加量为6mg/L较为适中。关键词:海水淡化;超滤;次氯酸钠中图分类号:TQ085文献标识码:A文章编号:1009-2455(2006)03-0024-03InfluenceofNaClOoneffluentwaterofUFtechnologyinseawaterdesalinationsystemZHANGJing-dong1a,ZENGHui-ming1a,SONGXiao-ning1b,LIUYan-wei1a,PANGSheng-lin2,LIUJin-sheng2,YEChun-song1b(1.a.DepartmentalofEnvironmentalEngineering,SchoolofResourceandEnvironmentalScience;b.DepartmentofWaterControlEngineering,SchoolofPowerandMechanicalEngineering,WuhanUniversity,Wuhan430079,China;2.ChinaHuanengYuhuanPowerPlant,Yuhuan317600,China)Abstract:UsingUFtechnologytopre-treatseawater,thegrowthofmicroorganisminfeedwatersystemcouldbecontrolledbyaddingNaClOtotheinfluentwater.Undertheconditionthatcertainqualificationswerenotchanged,theoptimaldosageofNaClOwasdeterminedafteradjustingthedosagestepbystep,aswellasconsideringthequalityofoutflowandtheoperationstatus.Theresultsshowedthat,properdosagecouldimprovethequalityofeffluentwaterofUFtechnology,whichrepresentedbythefollowingaspects:theSDIvaluedecreased0.2-0.7,themassconcentrationofSiandCODMndecreased0.5and0.7mg/Lrespectively,thepHvalueincreasedalittle,themassconcentrationofFeincreasedabout12μg/L.TheexcessdosageofNaClOwouldbringdownthequalityoftheeffluentwaterofUFtechnology.Thetestindicatedthat,inviewofthequalityoftheseawaterinthetestingarea,6mg/LwasconsideredtobetheproperdosageofNaClO.Keywords:seawaterdesalination;ultrofiltration;sodiumhypochlorite张敬东1a,曾惠明1a,宋小宁1b,刘炎伟1a,庞胜林2,刘金生2,叶春松1b(1.武汉大学a.资源与环境学院环境工程系;b.动力与机械学院水质工程系,武汉430079;2.华能玉环电厂,浙江玉环317600)现代有许多需要海水淡化供水的大型火电厂采用了超滤-反渗透联用技术,以超滤作为反渗透的预处理措施。火电厂要求控制管网及储存设备内细菌、藻类等的生长,以防止产水被二次污染,所以,拟采用在所取的海水中加入次氯酸钠以抑制管道及各种处理和储存设备内微生物的生长。但是,加入次氯酸钠又会对超滤产水水质产生影响,所以,研究这种影响对超滤的稳定运行有较大意义。1试验部分1.1试验用水试验用海水温度为31.4～33.0℃,pH≈8.2,ρ(COD