Repeated Use of Supernatant Water Generated in the Course of Treatment of Sludge from Water Treatment Plants

Summary

Results of the laboratory investigation of the process of treatment of flows generated in the course of treatment of sludge at water treatment plants using the flocculants of different types are presented. Two flocculants used at the Moscow State Unitary Enterprise Mosvodokanal, Praestol TR-650 and BC-852, have been evaluated. A few flocculants making it possible to treat the flows (discharges) maximally have been also selected for comparison. An assessment of influence of addition of flows to influent water coming to the facilities of the Eastern water treatment station has been made. Results obtained confirm the necessity of preliminary treatment of flows with flocculants before their supply to the head of facilities. When untreated flows are added the necessity of increasing the doses of reagents used may arise.

Key words

flocculant , sludge from water treatment plant , treatment of flows , supernatant water , recirculated water system