某水厂石英砂滤料清洗再生与过滤性能分析  

Analysis of Cleaning,Regeneration and Filtration Performance for Silica Sand Filter Media in a WTP

作　　者：贺磊 杨智强 袁小华 严晓燕 李露 吴晓艳 HE Lei;YANG Zhiqiang;YUAN Xiaohua;YAN Xiaoyan;LI Lu;WU Xiaoyan(Chuxiong Water Supply and Drainage Co.,Ltd.,Chuxiong 675000,China;Central and Southern China Municipal Engineering Design&Research Institute Co.,Ltd.,Wuhan 430010,China;Quality Supervision and Testing Center of Mohurd for Water Treatment Filter Material,Wuhan 430010,China)

机构地区：[1]楚雄市供排水有限公司,云南楚雄675000 [2]中国市政工程中南设计研究总院有限公司,湖北武汉430010 [3]建设部水处理滤料质量监督检测中心,湖北武汉430010

出　　处：《净水技术》2023年第12期72-79,共8页Water Purification Technology

基　　金：国家水体污染控制与治理科技重大专项(2017ZX07501003);云南省住房和城乡建设厅2022年度科学技术计划项目(K029421938)。

摘　　要：云南某水厂滤池中石英砂滤料在使用一定年限后,滤料表面黏附生成一层含有Al、Mn、Fe、Ca等金属元素的黑色物质而变为“黑化砂”,造成滤料板结、过滤能力下降、过滤周期变短及过滤反冲洗效果下降等现象。针对这一现状,对黑化砂采用“水洗+筛分”及“水洗+筛分+酸洗+研磨”两种方式清洗再生,再生后,对比分析黑化砂、水洗砂、酸洗砂及新砂各项性能指标,发现酸洗砂不仅外观恢复至新砂观感,多项性能指标同时得到改善。对黑化砂、水洗砂及酸洗砂进行生产性试验,从滤后水浑浊度、滤速、反冲洗效果及经济性等方面进行对比分析,研究发现黑化砂可通过“水洗+筛分”或“水洗+筛分+酸洗+研磨”方式再生实现二次利用,清洗再生后,滤料过滤性能得到较大提升,出水水质更好,且经济性较强,在生产应用中能满足水厂节能降耗需求,可在工程实践中结合需求选择合适的再生方式。The surface of the quartz filter material in the water treatment plant(WTP)in Yunan adhered to form a layer of black substance containing metal elements such as Al,Mn,Fe,Ca and became"blackened sand"after a certain number of years of use.These will result in slating of the filter media,a loss in filtration capacity,a shortening of the filtration cycle,a reduction in the effectiveness of filtration backwashing,and other problems.In order to clean and regenerate the blackened sand to meet this scenario,"water washing+sieving"and"water washing+sieving+acid washing+grinding"were used in this study.After regeneration,the performance indices of blackened sand,washed sand,acid-washed sand,and new sand were compared and studied.It was found that several performance indices were simultaneously improved and that the appearance of acid-washed sand was not only restored to that of new sand.Testing was done on the blackened sand,water-washed sand,and acid-washed sand for turbidity,filtration rate,backwashing effect,and post-filter water economy.It has been discovered that blackened sand could be regenerated by"water washing+sieving"or"water washing+sieving+acid washing+grinding"to achieve secondary use.The filtration performance of filter media after cleaning and regeneration is found to be greatly improved,the water quality is better,and the economy is stronger,which can meet the demand for energy saving and consumption reduction in WTPs.Appropriate regeneration methods can be selected based on needs in engineering.

关 键 词：石英砂滤料 黑化砂 酸洗 再生 过滤性能 

分 类 号：TU991[建筑科学—市政工程]