JPH0957292A - Waste water treating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform waste water treatment of a higher order in a device which is provided with an active sludge tank and a membrane separator arranged therein and by which liquid to be treated is subjected to aerobic treatment and to solid-liquid separation by suction filtration through a membrane by using a tank containing active carbon as the active sludge tank. SOLUTION: This waste water treating device for subjecting waste water of severe coloring and odor to aerobic treatment has an active sludge tank 1 containing active carbon 8 into which waste water to be treated is fed. In the tank 1, a membrane module 3 connected to a suction pump 4 is housed, and also, a diffuser 5 connected to a blower 6 is provided. In this way, waste water is subjected to solid-liquid separation by the membrane module 3, and the separated liquid is discharged as treated water 9 through a disinfection tank 2. The solid matter is discharged to outside the tank 1 by a withdrawal pump 10. By thus constituting the active sludge tank 1 from that containing active carbon, the biological active carbon increases organic matter decomposition power and restrains the clogging of the membrane module 3.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to wastewater, especially coloring,
The present invention relates to a wastewater treatment device that aerobically treats wastewater having a significant odor.

[0002]

2. Description of the Related Art Conventionally, there has been known a waste water treatment apparatus in which a membrane module is provided in an activated sludge tank, a liquid to be treated is aerobically treated, and solid-liquid separation is performed by suction filtration through a membrane.
And in this wastewater treatment device, aeration air is blown into the activated sludge tank, the aeration air not only supplies oxygen for aerobic decomposition, but also functions as a gas-liquid mixed flow cleaning of the membrane surface, It acts to delay the closure of the membrane. Therefore, this wastewater treatment equipment has rapidly spread due to the compactness of the equipment due to the elimination of the settling tank, the treatment that is not affected by bulking, etc., and the suspended suspension of wastewater (S
It has a remarkable effect on the removal of BOD derived from S) and SS.

However, there is a problem that a dissolved substance which is colored or produces an odor cannot be sufficiently removed by solid-liquid separation with a membrane, and it is desired to further extend the life of the membrane module. The dissolved substance can be removed by using a finer-pore membrane, but membrane obstruction naturally occurs rapidly. In order to prevent clogging of the membrane, there is a method of increasing the membrane area and decreasing the permeation amount per membrane area, but this leads to an increase in the size of the device and an increase in membrane cost.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a membrane-use wastewater treatment apparatus capable of removing coloring components and odorous components and suppressing clogging of the membrane.

[0005]

The present invention is directed to an activated sludge tank, a membrane separation device arranged in the activated sludge tank, a suction mechanism for a treatment liquid communicating with the membrane separation device, and a membrane separation device provided below the membrane separation device. In the wastewater treatment device consisting of diffusers arranged, the activated sludge tank is a tank containing activated carbon.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The wastewater treatment apparatus of the present invention aerates aerobically by treating a wastewater with air in an activated sludge tank, and a membrane separation apparatus performs solid-liquid separation by suction filtration through a membrane. In the wastewater treatment device to be performed, the activated sludge tank is a tank containing activated carbon. In the present invention, two effects are exhibited by using an activated sludge tank containing activated carbon.
One is that activated carbon is pre-coated on the membrane surface to form an activated carbon cake layer, which has the effect of preventing membrane clogging. improves. As a result, as a result of the addition of activated carbon, a high decomposition and removal ability for coloring components and dissolved organic substances such as BOD and COD is continuously exhibited.

The activated carbon added to the activated sludge tank is not limited in kind, and may be granular activated carbon, powdered activated carbon, low activated carbon or high activated carbon. The particle size of activated carbon is preferably larger than the pore size of the membrane.
The addition amount of activated carbon is not particularly limited, but if it is too large, the stirring effect by the blower is limited, and if it is too small, there is no cake layer forming effect or biodegradability improving effect on the membrane surface, and the addition amount of activated carbon is , 0.5 to 3 per liter of wastewater
It is preferably set to 00 g.

In the wastewater treatment apparatus of the present invention, a membrane module is preferably used as the membrane separation apparatus arranged in the activated sludge tank. The membrane module may have any shape such as a flat membrane type, a hollow fiber membrane type, a tubular type and a bag type, and the hollow fiber membrane module is more preferably used. The material of the membrane is not particularly limited, and includes cellulose, polyolefin, polysulfone,
A film made of any material such as polyvinylidene fluoride, polyfluoroethylene, or ceramics is used. The pore size of the membrane is not particularly limited, but it is preferably 0.2 μm or less for the purpose of separating even bacteria.

In the wastewater treatment apparatus of the present invention, the air diffuser is arranged below the membrane separation device in the activated sludge tank, and air sent by a blower, a compressor or the like is transferred from the air diffuser to the activated sludge tank. discharge.

The suction mechanism communicates with the membrane separation device and discharges the treatment liquid separated from the solid matter by the membrane separation, and may be a suction pump or a natural suction by a siphon utilizing the water level difference. .

In using the waste water treatment apparatus of the present invention, the air from the diffuser and the suction mechanism may be intermittently operated.

The wastewater treatment apparatus of the present invention is preferably used for treating domestic wastewater, industrial wastewater, landfill landfill leachate, and the like, particularly for treating wastewater having a marked color and odor.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The waste water treatment apparatus of the present invention will be described below with reference to the embodiment shown in FIG. In FIG. 1, the wastewater treatment apparatus sends air to an activated sludge tank 1 containing activated carbon 8, a membrane module 3, a suction mechanism of a treatment liquid 9 including a suction pump 4, an air diffuser 5 and an air diffuser 5. It consists of a blower 6 and an activated sludge tank 1
The waste water 7, which is the liquid to be treated, is sent to. The wastewater is aerobically decomposed, and then solid-liquid separated in the membrane module 3, and the separated liquid is sucked by the suction pump 4, passes through the disinfection tank 2, and is discharged as treated water 9. The separated solid matter is discharged to the outside of the tank by the drawing pump 10.

[0014]

EFFECT OF THE INVENTION The wastewater treatment equipment of the present invention has the effect of suppressing the clogging of the membrane by the presence of activated carbon, whereby the biological activated carbon enhances the decomposition of organic matter and forms a cake layer on the membrane surface of the membrane separation device. It exhibits and aerobically treats wastewater, especially wastewater with remarkable coloring and odor, and enables higher-order wastewater treatment than with conventional treatment equipment.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an example of a wastewater treatment device of the present invention.

[Explanation of symbols]

 1 Activated sludge tank 2 Disinfection tank 3 Membrane module 4 Suction pump 5 Air diffuser 6 Blower 7 Waste water 8 Activated carbon 9 Treated water 10 Extraction pump

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Claims (1)

[Claims] 1. An activated sludge tank, a membrane separation device arranged in the activated sludge tank, a suction mechanism for a treatment liquid communicating with the membrane separation device, and an air diffuser arranged below the membrane separation device. The wastewater treatment device is characterized in that the activated sludge tank is a tank containing activated carbon.