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Wastewater treatment operational method

A wastewater treatment and aeration tank technology, which is applied to the adjustment method of biological treatment, water treatment parameter control, biological water/sewage treatment, etc., can solve the problems of rapid changes in wastewater facilities and achieve the effect of practical wastewater treatment

Inactive Publication Date: 2017-08-18
PRAXAIR TECH INC
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  • Abstract
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  • Claims
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Problems solved by technology

As previously noted, conditions within wastewater facilities can change rapidly due to environmental factors such as passing through heavy rainfall and changes in industrial production

Method used

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  • Wastewater treatment operational method

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Embodiment Construction

[0019] With reference to the only Figure, there is shown a device 1 for implementing a second wastewater treatment process within a wastewater treatment facility, in which an influent stream 10 is biologically treated to remove pollutants consumed by aerobic bacteria, called biologically soluble chemical oxygen demand quantity. Influent stream 10 is received from the primary treatment section of the facility, where suspended solids are removed from the wastewater in primary settling tanks. Treatment of influent stream 10 produces effluent stream 12, which may then be treated in a tertiary treatment process.

[0020] The apparatus 1 comprises a selector aeration tank 14 from which effluent is fed as stream 16 to a main aeration tank 18 . As is known in the art, the selector aeration tank 14 may be several such tanks, and both the selector aeration tank 14 and the main aeration tank 18 may be sections of the same tank separated from each other by baffles . The purpose of the ...

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Abstract

A method of operating a waste water treatment facility to prevent bulking in which growth of floc forming bacteria is promoted within a selector aeration tank by controlling absorption and bio-oxidation of biodegradable soluble chemical oxygen demand by the bacteria. Absorption is controlled through measurement of a percentage removal of biodegradable soluble chemical oxygen demand and bio- oxidation is controlled through measurement of temperature corrected specific oxygen uptake rate. Both the absorption and bio-oxidation levels are controlled by decreasing the degree to which wastewater influent flow bypasses the selector aeration tank in favor of the main aeration tank when either of absorption or bio- oxidation are below targeted ranges and increasing flow rate of recycle activated sludge from the clarifier to the main aeration tank while decreasing recycle activated sludge flow rate to the selector aeration tank when absorption and bio-oxidation are above such targeted ranges.

Description

technical field [0001] The present invention relates to a method of operating a wastewater treatment facility in which aerobic conditions are maintained in a selector aeration tank and a main aeration tank downstream of said selector aeration tank, and activated sludge is returned from a secondary settling tank to said Selector aeration tanks and the main aeration tank to support bacterial treatment of biodegradable soluble COD contained in wastewater. More specifically, the present invention relates to a method that promotes the formation of mycolloids and thus sufficient settling of solids in clarifiers to allow discharge of treated effluent by maintaining said selector aeration The level of uptake of biodegradable soluble COD and the level of biooxidation in the pool, which will promote the formation of mycolloids. [0002] Background of the invention [0003] Wastewater is conventionally treated to remove carbonaceous compounds using aerobic bacteria contained in activat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/26
CPCC02F3/006C02F3/12C02F3/26C02F2203/004C02F2209/02C02F2209/08C02F2301/043Y02W10/10C02F2209/10C02F2209/40
Inventor 石燕R·B·马克思M·E·法比一
Owner PRAXAIR TECH INC
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