- Waste water overflows to secondary sedimentation tank and retained in this tank for 30 minutes before pumping sludge back to oxidation ditch. The circulation pumping time is 5 – 10 minutes. Observing color of circulation sludge water, if it is grey, pumping additionally 2 – 3 minutes. The amount of sludge back to oxidation is about10 m3/h.- Continueing the above process for 2 – 3 weeks. Observing conditions in tank continuously in each day and periodically 2 hours/ time:
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