C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
362/9
C02F 3/12 (2006.01) C02F 3/30 (2006.01) C02F 3/34 (2006.01)
Patent
CA 1197930
ACTIVATED SLUDGE WASTEWATER TREATING PROCESS ABSTRACT OF THE DISCLOSURE This invention provides an activated sludge process for treating wastewater containing ammonia as a contaminant and further for treating wastewater containing ammonia as a contaminant and other con- taminants which may possibly be present including cyanide, thiocyanate, sulfide and/or organics, wherein the process involves treating wastewater in the presence of an appropriate microorganism population acclimated to the wastewater contaminants and their levels in the wastewater, this microorganism popula- tion including (1) nitrifying microorganisms capable of converting ammonia to nitrite, (2) optionally, nitrifying microorganisms capable of converting nitrite to nitrate, and (3) facultative microorganisms capable of denitrifying nitrite and/or nitrate by oxidizing organic material and converting nitrite and/or nitrate to free nitrogen, with the process being operated under a series of controlled conditions to ultimately achieve in the activated sludge process a microbial conversion of ammonia to nitrite and/or nitrate and then to free nitrogen. The conditions controlled in the process of this invention include control of the sludge wastage rate, hydraulic resi- dence time, dissolved oxygen level (DO), sludge mixing rate, biological oxygen demand (BOD), pH and tempera- ture, as described hereinafter. Optionally, (4) other microorganisms capable of converting other contami- nants such as cyanide and thiocyanate to ammonia and sulfide to sulfate can also be present.
420432
Environmental Research And Technology Inc.
Macrae & Co.
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