摘要
在线化学强化反冲洗(CEB)可以有效减缓膜污染、恢复膜过滤性能,但在清洗过程中会产生化学强化反冲洗副产物(CEBBPs),影响膜出水水质。基于此,在考察CEB技术调控中反洗时间和反洗周期对膜清洗效果影响的同时,也对膜过滤出水中CEBBPs生成与变化进行了研究。结果表明:反洗时间的增加和反洗周期的缩减都会促进CEBBPs的生成,而跨膜压差增长速率却会降低;另外,产水量随着反洗时间的增加而呈下降趋势,随着反洗周期的延长而增大。通过数据分析,最佳反洗时间和反洗周期分别为4 min和120 min;在此参数下,跨膜压差增长速率为0.068k Pa/h,膜产水量是无清洗模式下产水量的93.5%。
Chemically enhanced blackwash （CEB） is one of the main strategies to restore the membrane flux and reduce membrane fouling. But chemically enhanced blackwash by-products （CEBB- Ps） generated during the membrane cleaning process can affect the permeate water quality. Therefore, the influence of CEB parameters （ backwash time and backwash cycle） on the generation of CEBBPs and membrane cleaning effect were investigated. The results showed that the increase in backwash time and decrease in backwash cycle both could promote the generation of CEBBPs and reduce the growth rate of transmembrane pressure. In addition, the water yield decreased with backwash time rising, while increased with backwash cycle rising. As a result of the experiments, the optimum backwash time and backwash cycle were 4 rain and 120 rain respectively, the growth rate was transmembrane pressure was 0. 068 kPa/h, and the water yield was 93.5 % of that under no membrane cleaning.
出处
《中国给水排水》
CAS
CSCD
北大核心
2016年第5期55-59,共5页
China Water & Wastewater
基金
国家自然科学基金资助项目(51308373)
天津市优秀青年教师资助计划项目(03010601)
关键词
超滤
化学强化反冲洗副产物
膜清洗
反洗时间
反洗周期
uhrafihration process
chemically enhanced blackwash by-products
membrane cleaning
backwash time
backwash cycle
