Treatment of sewage

Details Treatment of sewage Treatment of sewage

1976-06-22

1978-09-19

Wyse, Thomas G.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

210 63R, 210170, C02C 102

Patent

active

041152581

ABSTRACT:
Pure oxygen or a gas containing substantially more oxygen than air is injected under pressure into sewage held in or flowing through a rising or pumping sewer. This injection may be used to prevent the concentration of dissolved oxygen in the sewer falling to a level at which there occurs bacterial reduction to hydrogen sulphide of sulphate present in the sewage and/or to reduce the Biochemical Oxygen Demand of the sewage. The injection can also be used to oxidize to sulphur any sulphide dissolved in the sewage.
The pure oxygen or the gas containing more oxygen than air may be injected into sewage flowing through a sewage pipe forming part of a rising or pumping sewer, into a pump used to transfer the sewage through the sewer, or into a part of the sewer (e.g. a sump) where sewage is collected before being transferred through the sewer.

REFERENCES:
patent: 3525685 (1970-08-01), Edwards
patent: 3607735 (1971-09-01), Hover et al.
patent: 3663117 (1972-05-01), Warren
patent: 3734850 (1973-05-01), Karr
patent: 3957633 (1976-05-01), Gatti et al.
patent: 4042494 (1977-08-01), Stoyer

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