JP2002254092A - Solid-liquid separating device in activated sludge treatment facilities - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely solid-liquid separate treating water in activated sludge treatment facilities by means of a solid-liquid separating device of simple structure. SOLUTION: A bundle 7 of carbon fibers which are excellent in adhesion of microorganism is provided in the water route 6 of a treating liquid 3 containing the activated sludge, and a back-washing device 8 for back washing the sludge stuck to the bundle 7 of the carbon fibers and a stretching device 9 which usually stretches the bundle 7 of carbon fibers but loosens it at the time of back washing are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a solid-liquid separation device used in an activated sludge treatment facility.

[0002]

2. Description of the Related Art In an activated sludge method most commonly used as a method for treating organic waste water, as shown in FIG. 4, a raw water 1 is subjected to aerobic treatment in an aeration tank 2, and a treatment liquid containing activated sludge is treated. 3 is subjected to solid-liquid separation in a sedimentation tank 4. The activated sludge method is an excellent treatment method in terms of performance and economy, but it is important to maintain and manage properly in order to perform stable treatment.

[0003] In particular, solid-liquid separation, which is the final stage of processing,
Because it relies on gravity sedimentation in sedimentation tank 4,
It is susceptible to load conditions, microbial activity, outside air temperature, etc., and greatly affects the quality of treated water due to changes in the sedimentation of sludge. For this reason, a method in which various improvements are added to the activated sludge method has been proposed. In particular, in recent years, solid-liquid separation using a membrane has been adopted to improve the operability of solid-liquid separation. In solid-liquid separation using a membrane, since there is no outflow of sludge due to a change in operation conditions, reliable treatment can be performed.

[0004]

However, the solid-liquid separation using a membrane has a slow filtration speed and requires a complicated and large-sized facility for processing a required amount of liquid. In addition, it is necessary to frequently perform an operation such as backwashing because the sludge is easily blocked due to adhesion of sludge. In addition, although advanced treatment is possible, excessive treatment is performed, which may lead to excess equipment that does not match the quality of the treated water.

The present invention solves the above-mentioned problems in the solid-liquid separation of activated sludge. The activated sludge treatment equipment has a simple structure and is inexpensive. It is an object of the present invention to provide a solid-liquid separation device.

[0006]

SUMMARY OF THE INVENTION The solid-liquid separation device of the activated sludge treatment equipment of the present invention is provided in a channel for a treatment liquid containing activated sludge.
Along with installing a carbon fiber bundle with excellent microbial adhesion,
The above problem is solved by providing a backwashing device for backwashing sludge adhering to a carbon fiber bundle and a tensioning device for always tensioning the carbon fiber bundle and relaxing it during the backwashing.

[0007] In this solid-liquid separation device, the carbon fiber bundle having excellent adhesion of microorganisms is installed in the water channel of the processing liquid containing activated sludge in a tensioned state. Activated sludge adheres to the carbon fiber when passing through the space, and solid-liquid separation is reliably performed. Since the carbon fiber bundle is relaxed at the time of backwashing, the activated sludge attached can be efficiently separated from the carbon fiber.

[0008] The passing speed of the processing solution is much faster than the filtration speed when a membrane is used, so that the equipment can be miniaturized.
The frequency of the backwash operation may be less.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a configuration diagram of an activated sludge treatment facility provided with a solid-liquid separation device according to an embodiment of the present invention, FIG. 2 is a side view of the solid-liquid separation device, and FIG. It is an explanatory view of an operation. In this activated sludge treatment facility, raw water 1 is subjected to aerobic treatment in an aeration tank 2, and a treatment liquid 3 containing activated sludge is solid-liquid separated by a solid-liquid separation device 5.

The solid-liquid separator 5 is for backwashing the carbon fiber bundle 7 installed in the water channel 6 of the treatment liquid 3 containing the activated sludge flowing out of the aeration tank 2 and the sludge attached to the carbon fiber bundle 7. And a tensioning device 9 for always tensioning the carbon fiber bundle 7 and relaxing it during the backwashing. The carbon fiber bundle 7 is obtained by fixing the upper and lower ends of carbon fibers having excellent adhesion of microorganisms with the fiber fixing bar 10 and is installed in the water channel 6 so as to be slightly relaxed. The fiber bundle 7 is always kept in a tensioned state by a tensioning device 9 provided behind the fiber bundle 7. The carbon fiber bundles 7 are arranged in two rows or more depending on the conditions such as the quality of treated water and the amount of treated water.

The tensioning device 9 is a roller that can move back and forth, and at the time of back washing, as shown by a broken line in FIG.
Is moved backward, the carbon fiber bundle 7 can be relaxed. The backwashing device 8 is an aeration unit provided below the carbon fiber bundle 7. At the time of backwashing, compressed air is blown out to agitate the treatment liquid 3 and vibrate the carbon fiber bundle 7, so that the carbon fiber bundle is vibrated. The activated sludge attached is released.

In this solid-liquid separation device 5, the carbon fiber bundle 7 having excellent adhesion of microorganisms is installed in the water channel 6 of the treatment liquid 3 containing activated sludge in a tensioned state. When the treatment liquid 3 passes between the carbon fibers, the activated sludge adheres to the carbon fibers, and solid-liquid separation is reliably performed. At the time of back washing, the tensioning device 9 is moved backward to relax the carbon fiber bundle 7, and the back washing device 8 blows out compressed air to stir the treatment liquid 3 and vibrate the carbon fiber bundle 7, so that the carbon fiber bundle 7 is vibrated. The activated sludge thus separated can be efficiently separated from the carbon fibers.

The passing speed when the treatment liquid 3 passes through the carbon fiber bundle 7 is much faster than the filtration speed when a membrane is used, and the equipment can be miniaturized. In addition, since the carbon fiber bundle 7 is not likely to be blocked by the sludge attached like a membrane, the frequency of the backwash operation may be small. The solid-liquid separator 5 has a simple structure and a low cost.

[0014]

As described above, the solid-liquid separator of the activated sludge treatment equipment of the present invention can be easily operated and can surely perform solid-liquid separation, and has a simple structure and low cost.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an activated sludge treatment facility provided with a solid-liquid separation device according to an embodiment of the present invention.

FIG. 2 is a side view of the solid-liquid separation device.

FIG. 3 is an explanatory diagram of an operation of the tensioning device.

FIG. 4 is a configuration diagram of a conventional activated sludge treatment facility.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Raw water 2 Aeration tank 3 Processing liquid 5 Solid-liquid separation device 6 Waterway 7 Carbon fiber bundle 8 Backwashing device 9 Tensioning device 10 Fiber fixing bar

Claims (1)

[Claims] 1. A backwash device for installing a carbon fiber bundle excellent in microbial adhesion in a water channel of a treatment liquid containing activated sludge, and for backwashing sludge attached to the carbon fiber bundle, and a carbon fiber A solid-liquid separation device for activated sludge treatment equipment, comprising a tension device for constantly tensioning the bundle and relaxing it during backwashing.