The sludge that accumulated in the sand filter was flushed out
by backwashing the filter once or twice a week, with the system’s
water, into a separate sedimentation basin. The backwash
suspension (500 l) was allowed to settle for 30 min, the sludge
sediment was removed, and the remaining water was pumped
back into the system. This procedure meant, in practice, that very
little water was lost. Tap water was added to compensate for losses
due to evaporation.
The sludge that accumulated in the sand filter was flushed outby backwashing the filter once or twice a week, with the system’swater, into a separate sedimentation basin. The backwashsuspension (500 l) was allowed to settle for 30 min, the sludgesediment was removed, and the remaining water was pumpedback into the system. This procedure meant, in practice, that verylittle water was lost. Tap water was added to compensate for lossesdue to evaporation.
การแปล กรุณารอสักครู่..
