Exploration and Application of Gas-Water Backwashing Parameters in Anthracite-Sand Double-Layer Filter
In order to solve the problems of incomplete backwashing,loss of filter material and mixed layer in a 100 000 m3/d water treatment plant(WTP)in Jiyang City,the water backwash fluid dynamics(CFD)simulation of the filter was carried out to guide the selection of backwash strength in the water flushing stage,and pilot tests were carried out in the field.The test results showed that the gas-water combined recoil mode was adopted,with an air flushing phase of qs=17.0 L/(m2·s)and t=3 min,and during the water flushing phase,gradually increasing water flushing intensity with qw1=4.5 L/(m2·s)and t1=2 min,qw2=7.0 L/(m2·s)and t2=3 min,and qw3=17.5 L/(m2·s)and t3=3 min,the mud content of the filter material could be controlled below 0.1％and the mixed layer of the filter material could be restored.After the application of the optimal parameters in the project site,the backwashing problem of the WTP could be effectively solved.The filtration period could be extended,and the water consumption of the filter tank could be reduced by 192 720 m3.
万方数据
维普
