Backwash disc filter

What is a disc water filter

The disc filter is a water filter that intercepts impurities by pressing the filters with grooves on both sides to form tiny pores. The inner disc is made of reinforced nylon, which is wear-resistant and corrosion-resistant, and has a long service life. When the filter has been used for a long time, it is only necessary to replace the filter disc, which can ensure excellent filtering effect and low operating cost. When the disc water filter is backwashed, the gap between the filter discs becomes larger, and the centrifugal force generated by the rotation of the disc under the hydraulic drive will throw out the impurities. Due to its unique structure, the disc filter has an unmatched filtration effect and backwash effect that other backwash filters cannot match.

Types of disc water filter

How disc water filters work

The working state of the automatic backwashing disc water filter is divided into two types: 1. Filtration state: multiple filters are tightly stacked together under the action of the top spring pressure and hydraulic force. Water enters the filter from the inlet, and flows into the inner ring through the gap between the two disc units in the outer ring. Intercepted by the groove pores between two adjacent filters, clean water flows out through the water outlet.
2. Backwashing state: When backwashing starts, the system automatically controls the valve to change the direction of water flow. The original water inlet becomes a sewage outlet, and the water outlet becomes a backwashing water inlet. Under the action of water pressure, the spring is jacked up, and the filter gap becomes larger without the pressure of the spring. At the same time, due to the tangential water spray from the central nozzle, the filter starts to rotate at a high speed. Due to the influence of centrifugal force, the impurities trapped in the pores of the filter groove are thrown out and discharged from the system together with the water.
The disc water filter is composed of more than two filter units, so the equipment can backwash a single filter unit while the other filter units are working normally. Therefore, when a filter unit is in the backwash state, The water supply will not be interrupted.

Basic parameters of disc water filter

Operating pressure: 0.2-0.8Mpa
Backwash pressure: 0.15-0.6 Mpa
Working temperature: <70℃
PH: 4-13
Filtration grade: 20-200μm
Material:
Filter head body: 2", 3" and 4" filter heads are reinforced polyamide
Filter Disc: Polypropylene
Pipe frame: PE, stainless steel or carbon steel material optional
Valves: 2", 3" and 4" backwash valve reinforced polyamide
interface:
System inlet and outlet: standard flanges are usually 4", 6", 8",
System sewage outlet: standard flange 2", 3"

Features of disc water filter

Precise filtration: filter discs with different precisions can be selected according to water requirements, with 20 microns, 55 microns, 100 microns, 130 microns, 200 microns, 400 microns and other specifications, and the filtration ratio is greater than 85%.
Thorough and efficient backwashing: Because the filter pores are fully opened during backwashing, coupled with the centrifugal jet effect, the cleaning effect that other filters cannot achieve. Each filter unit backwash process takes only 10 to 20 seconds to complete.
Fully automatic operation, continuous water discharge: time and differential pressure control the start of the backwashing state. Within the filter system, backwashing is performed in sequence between the individual filter units and workstations. The filter can automatically switch between working and backwashing states to ensure continuous water effluent, low system pressure loss, and filtration and backwashing effects will not deteriorate due to use time.
Modular design: users can choose the number of filter units in parallel as needed, flexible and variable, and strong interchangeability. Can make full use of limited space.
Simple maintenance: almost no daily maintenance, no special tools for inspection, few removable parts.

What preparations are required before the disc water filter is commissioned?

1. A bypass valve needs to be installed before filtration. Please open the bypass valve for initial operation. After emptying the foreign matter accumulated in the pipeline system during the construction process, switch to the filtration system to protect the filter from running normally. (Otherwise, the system may not work properly)
2. Check whether the connection of the inlet and outlet pipes is correct;
3. Check whether the connection of the backwash sewage pipe is correct, and ensure the direct drainage of the trench;
4. Check whether the controller and signal pipeline are installed correctly;
5. Check whether the power supply of the controller is correct (220V/50Hz);
6. Check whether the differential pressure switch of inlet and outlet water is connected correctly.

How disc water filters start to work

1. Close the water outlet valve, open the water inlet valve, and confirm that the water inlet pressure is not lower than 0.25Mpa to ensure sufficient backwash water pressure;
2. Force the system to backwash until the water is clear. Forced backwashing can be realized from the controller command or manual control of the solenoid valve or distributor. The manual control method is: rotate the screw on the solenoid valve 1/4 turn, and backwash for at least 20 seconds;
3. Slowly open the water outlet valve to confirm that the water outlet pressure is not lower than 0.15Mpa.

Application of disc type water filter

1. Agriculture: agricultural irrigation, agricultural automatic fertilization and filtration, river water and well water use and filtration. 2. Industry: circulating water cooling water filtration, flushing water filtration, reverse osmosis pre-filtration, industrial sewage treatment.
3. Municipal: filtration of greening water, filtration of water for heating and heat exchange, filtration of water in waterworks, filtration of landfill leachate.

Advantages of disc filters

1. Good adaptability: It can handle various types of water sources, including surface water, well water, and even sewage. The equipment is resistant to high temperature and high pressure, and the operation is stable and safe.
2. Standard modularization, strong processing capacity, and small footprint: the system adopts unit modular design, and users can choose according to actual needs. Compact structure, small footprint and space saving.
3. Efficient and precise filtration: The filter technology with special structure can be used for precise filtration. Only the particles that meet the requirements can enter the system. Users can choose different filtration precisions according to the water requirements.
4. Low energy consumption: The backwashing speed is fast, which can be completed within ten seconds, completely efficient, and consumes very little water. If air-assisted backwashing is used, the water consumption can also be reduced to less than 0.2%. The device also consumes very little power.
5. Excellent quality: The products are in full compliance with the quality assurance standards, all products can be produced after simulation experiments, no special tools are required, and there are few parts. It does not require frequent maintenance, just regular inspections.
6. Fully automatic operation, continuous water output: The equipment has a fully automatic function, which can be freely switched between working and backwashing states, without manual operation, to ensure continuous water output. Even if the water quality of the incoming water changes greatly, it can automatically adapt.
7. Long service life of the element: The filter element is made of materials that are corrosion-resistant, wear-resistant and not easy to scale. After years of industrial practical verification, it will not wear and age for several years, and will not be worn for a long time. And reduce the filtering and backwashing effect.