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How to test the purity of the filter? FIRST!1.Wang Dong 2.Ma Jinghui 3.Zhang Hongli 4.(1. Beijing Waterlink Environmental Engineering Co., Ltd,BEIJING 100028;2. national industrial water treatment Engineering Technology Research Center,Tianjin 300131;3. School of Environment, Renmin University of China,Beijing 100872;4. Nordic Water, Sweden,[Abstract] the pilot-scale experiments on the deep treatment of two sedimentation tank effluent from municipal sewage treatment plant were carried out by means of silt and active sand filter,It is feasible to use it in municipal water reuse,The water quality is stable,The indicators are better than the requirements of the draft for comment on 2002 of the 'urban Miscellaneous water quality standard.The selection of the flocculation and the filtration effect of the filter are briefly analyzed.[Key words] filter;Continuous filtering;DynaSand active sand filter is an advanced one invented by Sweden Waterlink AB,Conti

Copper oxide is used for various purposes, such as glass colorants and oil sorizer. In order to obtain pure copper oxide to explore its nature, a classmate used industrial sulfuric acid (1) add appropriate water to dissolve,Stir,Precipitation,Precipitation.O when the solution is heated and evaporated until the crystal film appears,Stop heating;Even heated,The temperature is easily controlled below 1000C.Reaction rate of decomposition,The catalyst for the decomposition reaction.(2) stopwatch, rubber stopper, catheter, gas bottle and measuring cylinder.