Liquid purification or separation – Processes – Treatment by living organism
Patent
1998-01-09
1999-12-28
Upton, Christopher
Liquid purification or separation
Processes
Treatment by living organism
210612, 210617, 210631, 210151, 210181, 2102572, 71 13, C02F 328
Patent
active
060077190
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF INVENTION
The present invention relates to a process for treatment of high concentrated waste water using membrane separation, especially. This invention can be adapted to livestock husbandry, disposal of human excretion, and other high organic waste water.
BACKGROUND OF INVENTION
This process is performed by warming, anaerobic digestion(fermentation), ultrafiltration, and finally reversed osmotic separation steps also, the concentrated solution rejected by RO separation being possibly used as liquid fertilizer.
Generally, many known methods for waste water treatment have some problems in economical and technical point of view, so few of them have been used in industrial fields. Although the self-purification limit is known to be 10 mg/l of BOD, the effluents from domestic waste water range from tens to thousands mg/l of BOD and tens to ten thousands in animal waste water.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is an cross-section view of the warming unit.
FIG. 2 is a cross-section view of the adjusting tank.
FIG. 3 is a cross-section view of the anaerobic digestion tank.
FIG. 4 is an outline of the deodorizing apparatus installed in the warming unit.
FIG. 5 depicts a flow chart of a process for producing purified water and liquid fertilizer.
DISCLOSURE OF INVENTION
The present invention is different from ordinary known waste water treatment systems. It can decompose high concentrated organic water by anaerobic fermentation within several days, the effluents of anaerobic fermentation are treated with UF/RO membrane at the level of 0.1 mg/l of BOD.
In the warming stage, ammonia which could inhibit anaerobic fermentation is removed, and fatty acid is decomposed. Also the temperature of waste water maintains from 33.degree. C. to 35.degree. C., that is suitable for the following anaerobic fermentation steps.
The effluent from anaerobic tank is changed into nearly clean water through UF/RO membrane separation. And the methane gas produced from anaerobic fermentation as a by-product is possible to be used as energy source. Also, the residual solution after RO separation is aseptic and rich in organic and inorganic components, so it can become raw material of liquid fertilizer by adding some additives.
Some steps of pretreatment stage such as waste water collection, simple precipitation and solid-liquid separation are the same as in ordinary conventional process, but the core steps such as warming, adjusting step for pre-decomposition, anaerobic fermentation and UF/RO separation are necessary to purify the waste water.
These steps are diagrammed in FIG. 5.
A detailed description, referring to the drawings when necessary, of a process for treatment of high concentrated waste water is given below:
(1) Warming Step
Of waste water, the separated water which has passed the solid-liquid separator to remove solid matters, is put into a warming unit 1 through an influent pipe 2, warmed while flowing upon warming plates 5 of stainless steel material, beneath which copper pipes 10 for flow of hot water of about 90.degree. C. are laid, and then flows, of itself, down rugged plates 6 of ceramic material attached aslant to one side of said warming plates 5, which in turn is made in 8 to 13 stairs, gradually into an effluent pipe 3.
In this stage ammonia is all removed via an exhaust duct 4 in a gas collector and deodorized (with the use of the deodorization device of FIG. 4, devised by this inventor and applied for registration as a Korean utility model, Application No. 94-1158), some of the fatty acids getting decomposed in the meantime. The warmed water flowing out of said effluent pipe 3 of said warming unit 1 is kept in store in a thermally insulated adjusting reservoir 11 (of fiber-reinforced plastic (FRP) or stainless steel) of FIG. 2 to remain at 33.degree. C. to 35.degree. C., and is sent to an anaerobic digestion tank 22 by certain quantity each time by fixed quantity motor pumps 19,20.
In the warming step, firstly by adoption of a multiple step of natural falling process it is made possib
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Lee Kyu Seung
Yoo Seuk Won
Upton Christopher
Yoo Seuk Won
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