Experiment on the filtration and back wash of sediment desil ting filter of circular ring
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Abstract:
The ex per iment s o n the filtr ation bed in the filter tank of sediment desilting filter of circular r ing wer e conducted to in2 v est igate the filtration perfo rmance o f the filter lay er after the desig n o ptimizat ion and backwashing effects o f the filter lay er af2 ter the filtr ation period. Thr ough the pavement and ex per iment of the filter layer after the desig n optimizatio n, the r esults show ed that w hen t he velocity w as 19 m/ h and the turbidity o f incoming w ater to be filtered w as 50 NTU, the turbidity of efflu2 ent w as close to 0; when the turbidit y o f incom ing w ater w as 300 NTU, the turbidity of effluent w as 3 NTU; and w hen the tur2 bidity of incoming water was below 500 NT U, the turbidity o f effluent w as below 5 NTU, which met the standar d o f r ough fil2 tr atio n in the rur al wat er supply. Mo reov er, w hen the velo city o f f low was 18. 75 m/ h, the tur bidit y of incoming w ater to be fil2 ter ed w as about 400 NTU, t he filtration cy cle r eached 13 hours. T he filter material was clean after six times o f backwashing, the differ ence between upstr eam and downstream water levels r eco ver ed to the o riginal state, filt ratio n cycle w as about 15 minutes, and water consumptio n r ate w as 11 8%. The gr avit y of water w as applied t o flush the silt and sand in the g rit chamber and filter tank, and no additional pow er w as needed. Therefo re, the dev ice achiev ed the objectiv e of energ y saving, environmental pr otec2 tion, and hig h efficiency w hen applied t o the ro ug h filt ratio n o f rura l w ater supply .
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