摘要
采用超滤紫外消毒工艺处理洗涤污水,以衣物白度和卫生学指标作为评价标准,考察该工艺的处理效果及循环利用的可行性。试验结果表明,采用截留相对分子质量为50 000的超滤膜能够有效去除水中的浊度、悬浮物、油脂等污染物,但对细菌、大肠菌群的去除率较低。相关性分析表明,超滤出水较高COD值是由水中剩余的阴离子表面活性剂(LAS)引起。游离LAS分子大小远低于超滤膜孔径,保留在渗透液中,被循环洗涤有效利用。超滤出水通过进一步紫外线消毒,当消毒剂量大于3 750 J/m2时,处理水的大肠菌群和细菌总数达到了我国饮用水水质标准,水质满足循环利用洗涤衣物的要求,长期洗涤对衣物的白度无不良影响。超滤膜在水力反冲洗条件30 m in反冲洗2 m in时,膜的渗透通量和净产水量较高。采用pH值为11—13的碱液化学清洗,膜通量能够完全恢复。
Two most important factors of hygienic requirement and whiteness of clothes were considered for laundry wastewater recycling and reuse by uhrafiltration （UF） and ultraviolet （UV） disinfection treatment. The experiments show that UF with relative molecular mass cut-off of 50 000 can remove the turbid, suspended solid, fat oil and grease effectively, but the removal rate of bacteria and E. coli is low. According to the correlation analysis, the higher COD of UF effluent is caused by anionic surfactant （LAS）of detergent overdosed. Although dissociative LAS is hardly separated by UF membrane because the molecular mass of LAS is far less than that of UF membrane, it is available to reuse by wastewater recycle. As dosage of UV disinfectant increases to 3 750 J/m^2, the bacteria and E. coli of effluent declines to achieve the Chinese Drinking Water Quality Standard. Moreover, the whiteness and brightness of cotton cloth washed by reused water is the same as that washed by tap water after a long time of recycle wash, the water quality by UF-UV treatment can satisfy washing requirement. Both the membrane flux and the net water product are superior on the condition of backwashing 2 rain every 30 rain filtration. Using alkali liquor with pH of 11-13 to carry out chemical cleaning, the membrane flux can be recovered completely.
出处
《化学工程》
EI
CAS
CSCD
北大核心
2007年第1期56-59,共4页
Chemical Engineering(China)
基金
铁道部基金资助项目(2003Z005)
关键词
超滤
紫外消毒
洗涤污水
循环利用
大肠菌群
uhrafihration
ultraviolet disinfection
washing wastewater
recycling and reuse
E. coli
