Comparative study on performance index limits of water treatment filter material at home and abroad
The filter material used for water treatment is the key material of the filter,and its performance index limit directly affects the production quality of the filter material and the opera-tion effect of the filter.The current professional standard for filter media in China,Filter material for water treatment(CJ/T 43-2005),was revised in 2005 based on the American standard(AN-SI/AWW A B100-2001).In the past 20 years of implementation,the domestic economic and so-cial development status and foreign standards have changed,so it is necessary to revise the standard appropriately.Based on a comparative study of the current standards in the United States,Japan,and Europe regarding the limit values of filter media indicators,combined with the production and operation of filter media in China,it is recommended to supplement the requirements for the effec-tive size of filter media such as silica sand and anthracite,as well as the minimum and maximum limits of uniformity coefficient when revising industry standards.It is particularly recommended that the minimum limit value of uniformity coefficient should not be less than 1.4.The limit value of the mass fraction of oversize and undersize particles should be refined according to the structure layer of the filter material.The limit value of the sum of breaking rate and wear rate should be ad-justed from 2%to 3%.
Filter materialPerformance index limitsEffective sizeUniformity coefficientBreaking rateWear rate