Chemistry: molecular biology and microbiology – Apparatus – Bioreactor
Reexamination Certificate
2000-08-21
2001-07-10
Redding, David A. (Department: 1744)
Chemistry: molecular biology and microbiology
Apparatus
Bioreactor
C435S290400, C210S413000, C210S414000, C210S415000, C004S319000, C004S320000, C004SDIG004, C004SDIG001
Reexamination Certificate
active
06258594
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a human waste treatment system for separating human waste into solid and liquid parts for subsequent treatment such as microbial decomposition treatment and/or activated sludge treatment.
Microbial decomposition and activated sludge treatments are two major known ways to treat human waste. The former method is now especially popular because with this method, decomposed solid parts of the waste can be used as organic fertilizers.
In the microbial decomposition treatment, if the liquid content of the waste is too high, the decomposition capability drops extremely. Conversely, too low a water content will result in reduced activity of microbes. It is therefore important to accurately control the treating temperature and humidity to maintain high microbe activity.
In the activated sludge treatment, if waste is introduced into a decomposition tank in an amount exceeding its treating capacity, growth of bacteria in the tank will slow down, thus resulting in a sharp drop in the decomposition capability. Part of the waste may thus be discharged untreated. Japanese patent publication 10-286566 discloses an activated sludge treatment system, which will be described in the description of the second embodiment of the present invention. Since waste is directly introduced into this system, large amounts of scam, flock and sludge are produced. Thus, this system needs many tanks and thus is costly.
An object of the present invention is to provide a waste treatment system for separating human waste into solid and liquid parts for subsequent treatment such as microbial decomposition treatment and/or activated sludge treatment.
SUMMARY OF THE INVENTION
According to this invention, there is provided a waste treatment system comprising a waste separator comprising an outer box, a cylindrical member made of a water-permeable material and coaxially received in the outer box, a top plate closing the top openings of the outer box and the cylindrical member, the cylindrical member having an open bottom, a vertical rotary shaft coaxially extending through the top plate into the cylindrical member, a helical rotary brush mounted on the vertical rotary shaft, the top plate being formed with a port through which waste is introduced into the cylindrical member, a closure member for closing the bottom opening of the space defined between the outer box and the cylindrical member and formed with a discharge port, and a drive unit for rotating the rotary shaft and the brush, whereby waste supplied into the cylindrical member is separated into a liquid part, which passes through the cylindrical member into the space and is discharged through the discharge port, and a solid part, which is moved down in the cylindrical member by the brush and drops through the open bottom.
The waste disposal system may further comprise a microbial decomposition tank provided under the waste separator so as to communicate with the interior of the cylindrical member through its open bottom; an activated sludge treatment device comprising a plurality of tanks and connected to the discharge port of the separator; or a discharge pipe connected to the discharge port and formed with numerous holes, and an evaporation mat in which at least the portion of the discharge pipe formed with the numerous holes is buried.
Waste introduced into the sleeve is pulverized into small pieces by the helical brush with the water content of the waste removed. The remaining solid content is discharged through the bottom opening of the sleeve. The solid content discharged is decomposed in the decomposition tank and used as organic fertilizers.
The separated liquid content of the waste scarcely contains scum, flock and sludge, so that it can be extremely efficiently decomposed in the activated sludge decomposition device.
When the separated liquid content is introduced into the evaporation mat, it is decomposed by microbes in the soil layer and enriches the soil.
If the system is used for a temporary toilet, which is used mainly in the daytime and seldom used in the nighttime, a storage tank for storing the separated liquid content is provided and the decomposition tank is preferably operated while supplying separated water into the decomposition tank from the storage tank to keep the water content of the decomposition tank to a suitable level for decomposition.
Other features and objects of the present invention will become apparent from the following description made with reference to the accompanying drawings, in which:
REFERENCES:
patent: 5296136 (1994-03-01), Able
patent: 5773281 (1998-06-01), Ichikawa et al.
patent: 5945332 (1999-08-01), Fors
patent: 10-286566 (1998-10-01), None
Redding David A.
Suiko Kinzoku Kabushiki Kaisha
Wenderoth , Lind & Ponack, L.L.P.
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