Process for rapidly determining biological toxicity of wastewate

Details Process for rapidly determining biological toxicity of wastewate Process for rapidly determining biological toxicity of wastewate

1985-12-16

1986-11-04

Castel, Benoit

Liquid purification or separation

Processes

Treatment by living organism

210611, 436 62, 436138, 435 32, C02F 312, C12M 136, G01N 3318, C12Q 118

Patent

active

046209301

ABSTRACT:
This invention pertains to a method for analyzing the biochemical decomposibility of aqueous substrates by microorganisms and particularly to a method for analyzing the quality or biological toxicity of incoming sewage to a sewage disposal plant. The process comprises: placing a preselected amount of bacterial culture, in the form of a dried powder, in contact with a preselected amount of aqueous waste containing greater than 5 mg/l dissolved oxygen, the bacterial culture being capable of effecting aerobic biodegradation of organic waste; measuring the dissolved oxygen content of the aqueous waste during rehydration and respiration development of the microorganisms as a function of time; determining the rate of dissolved oxygen decline at a preselected time; and then comparing the rate of dissolved oxygen decline to the rate of dissolved oxygen for a preselected baseline standard substrate. By comparing the ratio of dissolved oxygen decline at a preselected time with respect to a test sample and a standard substrate one can calculate the relative toxicity or inhibition of the incoming sewage to aerobic respiration and growth.

REFERENCES:
patent: 3510407 (1970-05-01), Stack, Jr.
patent: 3981777 (1976-09-01), Alsop
patent: 4162195 (1979-07-01), Solyom et al.
patent: 4329232 (1982-05-01), McKenna
patent: 4564444 (1986-01-01), Hiraoka et al.
patent: 4564453 (1986-01-01), Coplot et al.

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