Disc Membrane Filter

Product Introduction

Disc membrane filter is mainly used for further purification of surface water, deep treatment of sewage, reuse of reclaimed water, etc. In the process of deep treatment of sewage, disc membrane filter is installed after the secondary sedimentation tank of the conventional water treatment system. It is mainly used to remove solids, and remove some phosphorus, turbidity, COD in combination with chemical agents. It is used to improve the discharge standard of the sewage from Class B to Class A, so as to meet the discharge standards.

The product has the following features:

1. Compact structure, few auxiliary equipment, low investment.

2. Modular design and installation, simple and convenient operation and maintenance.

3. Low equipment idle rate, low installed power, low operating cost.

4. Good and stable effluent quality.

5. Automatic operation, strong shock resistance.

Working Principle

Disc membrane filter is a kind of rotary drum filter. The filter is composed of a series of horizontally mounted, rotatable filter discs, which are installed on the central pipe shaft. The maximum water immersion volume can reach 60%. The sewage flows from the inside to the outside through the stainless steel mesh, and the filtered clean water flows out from the end of the machine.

The sewage flows into the center of the hollow shaft of the filter by gravity and enters the inner side of the filter discs arranged on the hollow shaft. On both sides of each filter disc are high-strength and dense stainless steel filter cloths. After the sewage flowed out from the inner side of the filter cloth to the outside, the clean water will flow into the clean water tank, while the fine particles will accumulate on the inner side of the filter cloth. When particles in the sewage gradually form a sludge layer inside the filter cloth and accumulate to a certain extent, the water level will rise, triggering the liquid level sensor to send a signal. The PLC control system will start the drum to rotate and start backwashing.

Backwash process: the nozzles located at the top of the discs will spray high-pressure water to wash away the accumulated particles inside the filter cloths. The backwash water is the filtered water from the filter itself. The particles flushed away will be discharged through the discharge outlet under the action of gravity.

During the backwashing process, the filtration of the sewage is uninterrupted and continuous.

Equipment Structure

1. Central water inlet and distribution device. Disc membrane filter is equipped with a central water inlet and distribution device, including: central water inlet pipe, water distribution drum, linkage gear, linkage chain, rotating bearings, sealing elements, etc. There is a collection and discharge tank located at the upper end of the water distribution drum. The sewage will be sent to the filter discs by the water distribution drum.

2. Filter disc. Each filter disc is composed of independent and detachable fan-shaped filter plates, each of which is composed of filter cloth installed on a stainless steel frame. The assembly structure of filter cloth and fan-shaped frame allows each fan-shaped plate to be easily removed and replaced, thereby facilitating the replacement of filter cloth. When filtering, the equipment works in a static state without moving. The filter system can effectively collect particles on the inner side of the filter cloth and flush them by high pressure water. The filtered water can be reused for backwashing.

3. Drive system. The drive system is a variable frequency drive device, including: gearbox, drive gear, drive chain and chain cover. The power supply of the drive motor is three-phase AC.

4. Backwash system.

a. Backwash system components. The backwash system includes: backwash water pump, backwash filter, flushing water pipe and nozzle system, backwash solenoid valve, dirt collection tank, and sludge discharge pipe.

b. Backwash system function. The function of the backwash system is to use a pump to extract filtered water and use a high-pressure umbrella-shaped spray system to flush the filter cloth from the outside to the inside, thereby removing the particles accumulated on the inner surface of the filter cloth. The frequency and time of backwashing are adjustable. During the backwashing process, the filtration of the sewage will not be affected. The backwash system automatically backwashes or timed backwashes the filter cloth according to the head loss. It can also be backwashed manually.

5. Frame and mounting accessories. The frame and mounting accessories are all made of 304 stainless steel.

6. Instrument. The equipment is equipped with liquid level sensors.

7. Control system. The equipment can be controlled automatically by PLC. It can be also operated manually.

Application Areas

1. Papermaking industry.

2. Preparation of circulating water, flushing water, and industrial water.

3. Preparation of process water for food and chemical industries.

4. Solid-liquid separation in synthetic materials industry.

5. Urban sewage treatment plants.

Technical Parameters