Liquid purification or separation – Processes – Treatment by living organism
Patent
1987-04-13
1991-09-03
Sever, Frank
Liquid purification or separation
Processes
Treatment by living organism
210758, C02C 174
Patent
active
050452029
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The treatment of waste water such as sewage or other biodegradable materials under pressure by air or oxygen is known to the art.
Such treatment has been done in a pressurized state as disclosed in U.S. Pat. No. 3,477,581, which issued to Donald M. Stearns, a co-inventor of the present application, on Nov. 11, 1969.
While the process of U.S. Pat. No. 3,477,581 is an advance in the treatment of sewage and other waste water, it requires one or more relatively large pressurized tanks and is not well suited to individual treatment systems, or to systems for small communities which may otherwise use septic tanks and the like.
The pressurization of the waste water as disclosed in U.S. Pat. No. 3,477,581 will increase the absorption rate of the oxygen used, but still is a relatively complex and cumbersome way to absorb oxygen by the sewage, and requires a large volume closed tank and is considered a batch process.
It has been established that the absorption of oxygen is an exponential function of pressure with the exponent greater than 1.0. This relationship is a partial basis for this application.
SUMMARY OF THE INVENTION
The present invention provides a novel diffusion means that provides surface contact between the gas phase and the liquid phase in the mixture of wastewater and air or Oxygen enriched gas comparable to the surface contact normally provided by the use of aeration tanks having a liquid height of 14-18 feet. This same novel diffusion means provides the ability to operate efficiently in liquid levels as low as 3 feet and the ability to operate at variable liquid heights of from 3 feet to in excess of 100 feet. This two stage novel diffusion means overcomes the effect of pressure normally generated by the height of the liquid column by using individually, or in series, a centrifugal first stage submersible mechanical diffuser consisting of an enclosed chamber with a wastewater inlet, a gas inlet, and a discharge into the second stage pressurized static diffuser. The design of the second stage diffuser is based on the requirement of sufficient resistance to hydraulic flow that will produce a backpressure that will provide suitable pressure ranges of from 5-30 PSI in the enclosed chamber of the centrifugal diffuser with the selection of the definitive operating pressure based on the application requirements. The mechanical design of the centrifugal first stage mechanical diffuser is attached with this application for information only, as a separate mechanical United States Patent application is being applied for. The diffusion means of the claimed invention can be readily adapted for aeration requirements in gravity collection system manholes, wetwells of pumping stations, and force main transmission pipelines as the physical size is comparable to that of a standard submersible recessed impeller wastewater hydraulic pump.
It is the object of this invention to provide a diffusion means coupled with a pump that will provide for the necessary mixing of the gas in any type of wastewater stream without consideration for the liquid height requirements that will maintain the level of dissolved Oxygen sufficiently to inhibit anaerobic digestion of waste products and also provide pretreatment of the waste products in order to reduce the loading of wastewater treatment plants and thereby increase their capacity.
It is another objective of this invention to provide a combination diffusion and mixing means that will provide efficient Oxygen transfer at wastewater levels as low as 3 feet and will be able to continue to provide efficient Oxygen transfer at any variable level of wastewater between 3 feet and 100 feet. This will allow a new means of operation of wastewater treatment plant system at variable liquid levels in place of the almost constant levels of operation in current plants. This ability will in turn greatly increase the capacity of existing and future wastewater treatment facilities.
It is still another objective of this invention to eliminate the problems of odor, cor
REFERENCES:
patent: 3948492 (1976-04-01), Hege
Haentjens Walter D.
Stearns Donald M.
Stirling Thomas
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