Two-stage batch wastewater treatment

Details Two-stage batch wastewater treatment Two-stage batch wastewater treatment

C - Chemistry, Metallurgy

02

F

362/12

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

Patent

CA 1331896

ABSTRACT OF THE DISCLOSURE A two-stage, batch process for purifying wastewater containing organic and adsorbable pollutants includes the steps of introducing a predetermined quantity of the wastewater into an aeration and settling zone of a primary treatment zone and aerating therein in the presence of a powered absorbent, such as activated carbon, and biologically active solids, terminating aeration and retaining the thus-treated wastewater in the aeration and settling zone a sufficient time for a substantial portion of the suspended solids to settle by gravity. A predetermined amount of the partially-treated wastewater is withdrawn from the aeration and settling zone and introduced into a contact zone wherein it is agitated, preferably by aeration, in the presence of a powered absorbent, agitation is terminated and the solids are allowed to settle by gravity. After completion of settling, clarified, substantially solids-free water is withdrawn from the contact zone.

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