Automatic Backwash Filter For Solid-Liquid Separation

An Automatic Backwash Filter For Solid-Liquid Separation serves as a highly efficient solid-liquid separation device widely employed in water treatment, chemical, food, pharmaceutical, and environmental protection industries. Its operation is based on a forward-inflow, backward-waste discharge mode, with a reverse water flow periodically or pressure-difference triggered to clean the filter screen, maintaining filtration performance and extending the life of the filter element.

Technical Parameters

Filtration precision	20-400 microns
System working pressure	0.2-1.0Mpa
Backwash requires water pressure	≥0.18Mpa
Medium temperature	<60 degrees
Power supply voltage	AC220V 1A
Control output voltage	DC24V 1A per channel
Control mode	Differential pressure, timing, manual
Pipe material	Carbon steel, stainless steel, HDPE, etc.

Basic Structure

An Automatic Backwash Filter For Solid-Liquid Separation primarily consists of a housing, filter screen (filter cylinder), drain valve, inlet, outlet, backwashing mechanism (including backwash valve and backwash pump), and control system.

1. Housing

Typically made of carbon steel, stainless steel, or other corrosion-resistant materials, the interior of the housing features a support structure for securing the filter screen, ensuring equipment strength and corrosion resistance.

2. Filter Screen

As the core component, the material, pore size, and structure of the filter screen significantly influence filtration precision and efficiency. Common types include metal mesh, nylon mesh, sintered filter tubes, fiber bundles, etc., selected according to filtration requirements.

3. Drain Valve

Located at the bottom of the device, it discharges trapped solids and wastewater generated during backwashing.

4. Inlet and Outlet

Respectively connected to the upstream and downstream pipelines, they ensure the normal filtration process.

5. Backwashing Mechanism

Responsible for providing backwashing power when needed, comprising a backwash valve that controls water flow direction and a backwash pump that supplies backwashing pressure.

6. Control System

Comprising pressure gauges, differential pressure switches, time controllers, etc., it monitors filtration status and triggers the backwashing process based on preset conditions.

Operating Principle

1. Forward Filtration

Untreated water enters through the inlet, passing through the filter screen, which captures suspended solids, particulates, and other impurities. Clean water then exits through the outlet, achieving solid-liquid separation.

2. Backward Washing

After a period of filtration, when accumulated impurities on the filter screen cause the differential pressure to reach a set value or a preset time cycle is reached, the control system initiates the backwashing process. At this point, the backwash valve switches the water flow direction, and the backwash pump supplies a high-pressure reverse water flow, which washes away adherent impurities from the inside out and discharges them via the drain valve. Upon completion of backwashing, the valves return to their original positions, resuming the forward filtration process.

Key Features and Advantages

1. Automatic Backwashing

The Automatic Backwash Filter can trigger backwashing processes based on differential pressure or time without manual intervention, greatly reducing maintenance costs and time.

2. Efficient Filtration

Utilizing precision filter screens, the Automatic Backwash Filter offers high filtration precision, effectively removing various fine particles to ensure water quality meets subsequent process or usage requirements.

3. Self-Cleaning

The backwashing function continuously cleans the filter screen, preventing blockages and maintaining stable filtration performance, prolonging filter element life.

4. Continuous Operation

Backwashing can occur while the device remains operational, ensuring continuous water supply and avoiding production interruptions due to cleaning.

5. Energy Saving and Cost Reduction

Compared to traditional filtration devices, the Automatic Backwash Filter, with their efficient self-cleaning capability, reduces the need for frequent filter element replacements, lowering operating costs.

Applications and Scenarios

1. Water Treatment Industry

Used in waterworks, wastewater treatment plants, reclaimed water systems, and cooling water circulation systems to remove suspended solids, algae, rust, colloids, and other impurities from raw water or circulating water.

2. Chemical Industry

Employed in raw material pretreatment, product refining, and cooling water circulation systems in the chemical industry, protecting critical equipment such as heat exchangers, pumps, and instruments from particle wear or blockage.

3. Food and Pharmaceutical Industries

Used in the pre-treatment of process water in the food and pharmaceutical industries, removing minute particles that could potentially affect product quality, ensuring food safety and drug purity.

4. Environmental Protection

In industrial wastewater treatment, rainwater harvesting and utilization, and groundwater purification projects, automatic backwashing filters serve as pretreatment devices, enhancing the efficiency and stability of subsequent treatment units.

5. Agricultural Irrigation

Filters water sources to prevent excessive impurities in irrigation water from harming farmland, ensuring the healthy growth of crops.

Equipment Selection and Maintenance

1. Equipment Selection

Based on actual water quality conditions (e.g., suspended solids content, particle size distribution, water hardness), treatment volume, required filtration precision, operating pressure, backwashing method, etc., choose appropriate filter screen materials, pore sizes, filtration areas, and backwashing pressures and time settings.

2. Routine Maintenance

Regularly inspect the device's operating status, including differential pressure readings, backwashing effectiveness, and drainage conditions, promptly clearing any blockages in the drain valve. For certain specialized applications, periodic filter screen cleaning or replacement may be necessary. Follow the manufacturer's operation manual and maintenance guidelines to ensure the long-term stable operation of the equipment.

FAQ

1. Q: What is the function of a filter?

A: The main function of a filter is to remove solid particles, impurities, and harmful substances from liquids or gases, in order to achieve purification, clarification, and protection of equipment.

2. Q: How to choose a suitable filter?

A: When choosing a filter, factors such as the properties of the material being filtered (e.g., viscosity, temperature, corrosion), required filtration accuracy, processing capacity, operating pressure and medium, as well as the type, material, size, and installation method of the filter should be considered.

3. Q: What is the working principle of a filter?

A: The working principle of a filter mainly relies on physical screening, deep interception, absorption, or chemical reactions to remove impurities or harmful components from the material being filtered.

4. Q: How to maintain and care for a filter?

A: Maintenance of filters includes regular cleaning or replacement of filter elements, inspection of seals and fasteners, maintaining stable operating pressure, and avoiding overloading. Specific methods should be referenced from the filter's instruction manual and maintenance guides.

5. Q: What is the service life of a filter?

A: The service life of a filter depends on its working environment, processing volume, and filtration accuracy. Generally, when the filter's pressure drop reaches a certain value or the filtration effect decreases significantly, it needs to be replaced or cleaned.

6. Q: What should be paid attention to during filter installation?

A: During filter installation, attention should be paid to the directionality, ensuring that the fluid enters and exits from the correct ports. Also, the piping system should be cleaned before installation, and the filter should be securely fastened and sealed as required by the instructions.

7. Q: What is the replacement cycle for filters?

A: The replacement cycle for filters depends on their working conditions and filtration requirements, and is usually indicated by pressure difference indicators or timers. When the filter's pressure drop reaches the set value or the filtration effect decreases, it should be replaced in a timely manner.

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· Professional manufacturer with many years' experience

· Good quality with competitive price

· OEM & ODM are welcome

· Various payment items are acceptable

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1. Management Concept:

· Satisfy the customers' demand --- Touch customers, trust with our products and services

· Make employees happy --- Pursue higher material and spiritual happiness

2. Company Mission:

· Focus on customer needs, provide best filtering solution