机构地区: 湖南大学土木工程学院水工程与科学系
出 处: 《净水技术》 2006年第3期65-67,73,共4页
摘 要: 对黑化滤料经长期运行后的过滤、初滤、反冲洗水质情况进行了观测分析,并与同等情况下的新砂、酸洗黑化砂和碱洗黑化砂的过滤效果进行了对比研究,结果表明:黑化砂在长期运行后的水质与新砂相同,其对砷和硒的去除甚至更优;所测24项水质指标均满足现行国家饮用水卫生标准GB5749-85。因此,滤料黑化后可以继续使用一段时间而不必立即换砂或进行酸、碱清洗。 Water quality of the filtrate, the initial filtrate, and the back-washings of darkened sand (DS) falter after long-term operation was evaluated and compared with the quality of the filters with media of fresh quartz (FQ) sand, acidwashed and alkali-washed DS. Results indicated that the quality of DS filtrate is the same as the FQ sand filtrate overall, and even better than the FQ sand in As, and Se removal. Furthermore all the 24 measured water quality indexes of the DS filtrate meet the requirements of current national standards for drink water (GB5749-85). Thus, it is unnecessary to change the DS with FQ sond or to wash the filter media with acid or alkali, immediately when the media naturally darkened.