Liquid purification or separation – Processes – Treatment by living organism
Patent
1983-01-21
1985-08-27
Wyse, Thomas G.
Liquid purification or separation
Processes
Treatment by living organism
210614, 210626, 210903, C02F 312
Patent
active
045376824
ABSTRACT:
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 contaminants 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 population 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 residence time, dissolved oxygen level (DO), sludge mixing rate, biological oxygen demand (BOD), pH and temperature, as described hereinafter. Optionally, (4) other microorganisms capable of converting other contaminants such as cyanide and thiocyanate to ammonia and sulfide to sulfate can also be present.
REFERENCES:
patent: 3915854 (1975-10-01), Torpey
patent: 3964998 (1976-06-01), Barnard
patent: 3994802 (1976-11-01), Casey et al.
patent: 4132636 (1979-01-01), Iwase et al.
patent: 4271013 (1981-06-01), Bhattacharyya
patent: 4376701 (1983-03-01), Kubota
patent: 4437992 (1984-03-01), Saito et al.
Environmental Research & Technology
Wyse Thomas G.
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