Two-stage wastewater treatment

Details Two-stage wastewater treatment Two-stage wastewater treatment

C - Chemistry, Metallurgy

02

F

362/12

C02F 3/12 (2006.01) C02F 3/00 (2006.01)

Patent

CA 1332083

ABSTRACT OF THE DISCLOSURE A two-stage process for purifying wastewater containing organic and adsorbable pollutants includes the steps of first aerating the wastewater in the presence of a powdered adsorbent, such as activated carbon, and biologically active solids in the aeration zone of a primary treatment zone which also includes a quiescent zone. The thus-treated water passes from the aeration zone to the quiescent zone where it is retained a sufficient time for a substantial portion of the suspended solids to settle by gravity. The partially-treated wastewater overflowing from the quiescent zone is introduced into one or more contact zones wherein it is agitated, preferably by aeration, in the presence of a powdered adsorbent, agitation is terminated and the solids are allowed to settle by gravity and, after completion of settling, clarified, substantially solids-free water is withdrawn from each contact zone.

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