Liquid purification or separation – Recirculation – Serially connected distinct treating or storage units
Reexamination Certificate
1999-04-16
2001-01-16
Barry, Chester T. (Department: 1724)
Liquid purification or separation
Recirculation
Serially connected distinct treating or storage units
C210S197000, C210S221200, C210S264000, C210S284000, C210S763000
Reexamination Certificate
active
06174433
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a purification system for household wastewater. More particularly, the present invention relates to a household wastewater purification system with a photocatalytic decomposition treatment device having a photocatalytic material.
BACKGROUND OF THE INVENTION
Hitherto, in an area lacking an adequate sewage system, general household wastewater is discharged untreated into the natural environment as it is. This is a great cause of environmental, disruption.
Under these circumstances, recently, a combined wastewater purifier has become known which comprises three tanks, i.e. a settling tank for receiving and settling wastewater, a septic tank (anaerobic settling tank), and an aerobic biological treatment tank.
However, the combined wastewater purifier is generally a large-sized wastewater purifier and needs a wide site for installation. In addition, it is necessary to provide a separate flush toilet wastewater purifier, or the like, as installed at present. Therefore, the combined wastewater purifier suffers from the problem that it costs a great deal.
SUMMARY OF THE INVENTION
The present inventor conducted studies in order to solve the above-described problem and, as a result, succeeded in dispensing with a large-scale anaerobic septic tank and settling tank, making the whole wastewater purifier extremely small in size and increasing the wastewater purification efficiency, resulting in the proposition of a household wastewater purification system according to the present invention.
That is, the present invention provides:
(1) a household wastewater purification system including a first treatment tank having a household wastewater inlet in an upper part thereof, a photocatalytic decomposition treatment device having a photocatalytic material, at least a part of which lies above the water surface, and an anaerobic treatment device, the household wastewater purification system further including a second treatment tank adjacent to the first treatment tank and isolated therefrom by a partition wall, except for a lower part thereof that is communicated with a lower part of the first treatment tank, the second treatment tank having an aerobic treatment device therein and a purified water outlet in an upper part thereof, wherein a light-introducing part is provided above the first treatment tank;
(2) a household wastewater purification system as set forth in (1), wherein the light-introducing part is a light-transmitting cover;
(3) a household wastewater purification system as set forth in (1) or (2), wherein the anaerobic treatment device in the first treatment tank has an anaerobic microorganism-implanted carrier consisting essentially of charcoal;
(4) a household wastewater purification system as set forth in any of (1) to (3), wherein a basket for removing bulky foreign substances is provided in the upper part of the first treatment tank;
(5) a household wastewater purification system as set forth in any of (1) to (4), wherein the aerobic treatment device in the second treatment tank has an air diffuser and an aerobic microorganism-implanted carrier provided above the air diffuser;
(6) a household wastewater purification system as set forth in any of (1) to (5), wherein an air lifter is erected to supply sediment deposited in the bottom of the household wastewater purification system to the upper part of the first treatment tank, the air lifter consisting essentially of a pipe having a suction port at the bottom of the household wastewater purification system and a discharge port to the first treatment tank at an upper end thereof, the pipe further having an air inlet at an intermediate portion thereof;
(7) a household wastewater purification system as set forth in (6), wherein an air pipe connected to the air inlet of the air lifter is provided to branch off from a main air pipe connected to the air diffuser in the second treatment tank;
(8) a household wastewater purification system as set forth in any of (1) to (6), wherein an air pipe is installed in a lower part of the photocatalytic decomposition treatment device so that substances attached to the photocatalytic material are removed by underwater bubbling of a gas; and
(9) a household wastewater purification system as set forth in (8), wherein the air pipe for removing the substances from the photocatalytic material in the photocatalytic decomposition treatment device by underwater bubbling of a gas is provided to branch off from the main air pipe connected to the air diffuser in the second treatment tank.
REFERENCES:
patent: 5061369 (1991-10-01), Romero
patent: 5294315 (1994-03-01), Cooper
patent: 5501801 (1996-03-01), Zhang
Armstrong, Westerman Hattori, McLeland & Naughton
Barry Chester T.
Kyoei Plumbing Co., Ltd.
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