摘要
短流程集成膜滤工艺以其占地面积小、出水稳定等优点成为饮用水处理的研究重点,但目前仍缺乏实际中试运行参数及膜污染特征解析。基于常州某河流的中试运行结果,与直接超滤工艺(仅运行7 d)相比,一体式铁盐絮体-超滤工艺(运行25 d)和强化的絮体-超滤工艺(运行83 d)中的膜污染程度显著降低,分别将膜池稳定运行周期延长2.5倍和10.9倍;扫描电子显微镜和能谱表征结果表明,无论是否投加铁盐絮体,无机物均为滤饼层的主要成分,也是引起膜污染的主要原因。出水水质分析结果表明,一体式铁盐絮体-超滤工艺平均出水浊度低于0.1 NTU,浊度去除率大于99.5%,同时,COD和TP的去除率分别由37%和15%提升至64.58%和40%。此外,强化后的一体式絮体-超滤工艺中絮体的利用率更高,产水成本为0.491元·t^(-1)。
A short integrated membrane filtration process has been gradually become the drinking water treatment research focus because of its small area and stable effluent,while the information regarding the operation parameters and membrane fouling characteristics is still limited.Here,the pilot-scale test conducted in Changzhou showed that the integrated membrane process performed excellently;in comparison with the direct ultrafiltration(UF) process(only operated for 7 days),the membrane fouling was significantly alleviated for the iron salt floc-UF process(operated for 25 days) and the optimized floc-UF process(operated for 83 days).The related stable operation periods were prolonged by 2.5 times and 10.9 times,respectively.According to the scanning electron microscope and energy spectrum analysis,the inorganic matter was the major constitute of membrane filtration cake layer and also played a major role in causing membrane fouling in the absence/presence of iron salts.The results of effluent quality showed that the average turbidity of the integrated iron salt floc-UF process was lower than 0.1 NTU,and the turbidity removal rate was higher than 99.5%.In addition,the removal rates of chemical oxygen demand(COD) and total phosphorus(TP) increased from 37%and 15% to 60.58% and 40%,respectively.Moreover,the floc utilization efficiency of the optimized flocs-UF process was higher than others,and the water production cost was 0.491 yuan·ton^(-1).
作者
冯文涛
吴思琦
马百文
FENG Wentao;WU Siqi;MA Baiwen(School of Civil Architecture,East China Jiaotong University,Nanchang 330013,China;Key Laboratory of Drinking Water Science and Technology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2023年第6期1851-1859,F0002,共10页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(52070183)
国家自然科学基金国际(地区)合作与交流项目(51820105011)
中国科学院青年创新促进会项目。
关键词
超滤
铁盐絮体
一体式
中试
ultrafiltration
iron salt flocs
integrated process
a pilot-scale test
