In this paper, quartz sand filter was innovated for solution of such problems as filter media hardening, backwashing pressure and filter media loss during polymer-flooding wastewater treatment by utilization of such kind of filter. Agitation device was used to break the cake layer into pieces. After on-site testing, the backwashing pressure of the agitated quartz sand filter was reduced from 0.27~0.46 Mpa originally to 0.12~0.16 Mpa and therefore filter media loss was controlled. The contents of oil and SS ...
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