摘要
针对湖库水在夏季藻类含量过高的情况,采用以超滤为核心的组合工艺进行处理,考察了超滤中试系统对藻类的去除效果。结果表明,超滤系统出水的浊度、CODMn、细菌数量等指标均优于GB 5749—2006《生活饮用水卫生标准》,出水浊度为0.1 NTU,CODMn平均去除率为40.0%;前加氯有助于有机物和细菌的去除,CODMn去除率提高了5.8%,膜出水的菌落总数有所减少;超滤系统出水平均藻密度为4.6×104个/L,低于卫生部推荐《饮用水源中藻类卫生标准》警戒限值,也远小于水厂工艺出水藻密度;在超滤之前增加预处理工艺能有效改善超滤过滤性能,膜过滤水厂沉后水的SF比直接过滤原水高出45%左右。超滤膜恒压运行时,0.055 MPa时的膜通量比0.040 MPa时高32%左右,但降低跨膜压差,维持相对低一些的膜通量可以使系统产水更加稳定。因此,采用以超滤为核心的组合工艺能有效地控制湖库水中的藻类,保障饮用水安全。
In view of the situation of lake and reservoir water with high content of alga in summer, combined processes with ultrafihration as the core was used for processing, and the algae removal effect of the uhrafiltration pilot system was investigated. The results prove that ： the turbidity value, COD_MN, bacteria number and other indicators of uhrafiltration system effluent were better than ＂Drinking Water Standards （GB 5749-2006）. The effluent turbidity was 0.1 NTU and the average removal efficiency of COD_MNwas 40.0 %. Chlorination before uhrafiltration helps remove organic matter and bacteria, caused COD_MN removal rate increased 5.8 %, and the total number of colonies reduced. The average density of algae of uhrafiltration system effluent was 4.6 xl04 cells/L which was less than the warning limits value in ＂Algae Hygiene Standards in Drinking Water＂, and it was much less than the value of water plant effluent. Pretreatment can effectively improve the performance of ultrafiltration. Compare with the process of direct filtration of raw water, the flux （SF） of membrane filtration precipitated water of sedimentation tank effluent was increased by 45 %. When running in constant uhrafihration membrane pressure mode, the membrane flux of 0.055 MPa was about 32 % higher than 0.040 MPa,but reduee the transmembrane pressure and maintain a relatively low membrane flux can make the system more stable. Therefore, combined processes with ultrafihration as the core can effectively control algae in lakes and reservoirs and assure the safety of drinking water.
出处
《市政技术》
2015年第2期125-129,共5页
Journal of Municipal Technology
基金
国家自然科学基金(51308123)
福建省住房和城乡建设系统科学技术项目(2014-K-05)
福州大学科技发展基金(2013-XY-25)
中国博士后科学基金(2014M561856)
关键词
超滤
湖库水
藻密度
膜通量
uhrafihration
reservoir water
algae density
membrane flux
