Nitrification process in waste water treatment

Details Nitrification process in waste water treatment Nitrification process in waste water treatment

1987-02-17

1988-01-19

Wyse, Tom

Liquid purification or separation

Processes

Treatment by living organism

210625, 210631, 210903, C02F 334

Patent

active

047203447

ABSTRACT:
The ammonia concentration present in waste water is reduced by treating the waste water with a suspended growth microbial system such as an activated sludge containing organisms of the genus Nitrosomonas and organisms of the genus Nitrobacter, but in which the microbial activity of Nitrobacter is effectively inhibited. The process includes a step of treating the microbial system under conditions effecting inhibition of the Nitrobacter but substantially unaffecting the growth and metabolic characteristics of the Nitrosomonas, and subjecting the ammonia containing waste water to the so treated microbial system for a hydraulic retention time which is less than the recovery time of the inhibited Nitrobacter. As a result, the retrograde step of nitrite-nitrate conversion in the overall denitrification process also is reduced or eliminated, with consequent energy and cost savings.

REFERENCES:
patent: 3994802 (1976-11-01), Casey et al.
patent: 4011156 (1977-03-01), Dubach et al.
patent: 4173531 (1979-11-01), Matsch et al.
patent: 4370234 (1983-01-01), Marsland
patent: 4537682 (1985-08-01), Wong-Chong
patent: 4552663 (1985-11-01), Spector et al.

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