双层滤料滤池的优越性,通过国内外使用已无可置疑。但在运行中往往出现煤滤料流失现象。国内有的水厂每年流失率达30～40％。所以解决煤滤料的流失,是使用双层滤料滤池的一个关键。我们就此问题在流失原因及寻求合理的解决办法等方面,作了针对性的试验研究和实际生产运行的探索。 一、双层滤料滤池煤滤料在正常冲洗条件下流失现象的观测试验 The superiority of the double-layer filter filter is unquestionable through domestic and international use. However, coal filter material loss often occurs during operation. Some domestic water plants lose 30 to 40% each year. So solving the problem of coal filter material loss is a key to using a double-layer filter material filter. We have made targeted experimental researches and explorations of actual production operations in terms of the causes of loss and the search for reasonable solutions. I. Observation and test of the phenomenon of loss of coal filter material in double layer filter media under normal flushing conditions