The characteristics of multi media filter, the structure of multi media filter is introduced

1. Porous media filters are widely used in the process of water treatment, and can be used alone, but most of them are used as pre-filtration for advanced water treatment (exchange resin, electrodialysis, reverse osmosis).

2. The multi-media filter is a commonly used pretreatment device for deep purification of water quality, and different filter materials can be filled according to the process requirements.

3. The material of the multi-media filter can be made of glass fiber reinforced plastic, A3 steel anti-corrosion or rubber lining, and all stainless steel. There are two forms of operation, automatic and manual, automatic control is the use of automatic controller imported from the United States and pneumatic and hydraulic valve control, easy to operate and easy to maintain, in all walks of life water treatment process pre-treatment device has been widely used.

4. The filter material of the multi-media filter (including the double filter material filter) should have sufficient chemical stability, and the relative density and particle size of each medium should be different, and the relative density of anthracite used in the double-layer filter material filter composed of anthracite and quartz sand is, the particle size is, the relative density of quartz sand is, and the particle size is; In addition to the above two filter materials, the 3-layer filter can also use heavy ores such as manganese sand and magnetite, with a relative density and particle size.

1. The coagulation reaction effect of multi-medium filter is obvious, and the coagulation reaction mechanism and sedimentation mechanism are applied to effectively remove suspended solids and colloidal substances in the water, which is conducive to further reducing the turbidity of the effluent in the sand filter area.

2. The filter medium is automatically circulated, which can realize self-cleaning filtration without stopping the machine for backwashing.

3. The operation mode of the multi-media filter can be automatic or manual. Automatic control adopts the control of automatic controller and gas and hydraulic valves.

4. The filter material of multi-media filter (including the filter of double-layer filter material) should have sufficient chemical stability, and the relative density and particle size of each medium should have certain differences, the relative density of the filter composed of anthracite and quartz sand for anthracite is millimeter, and the relative density of quartz sand is millimeter; In addition to the above two filter materials, the three-layer filter material filter can also be used for heavy ores such as manganese sand and magnetite, with a relative density and particle size.

Remove impurities such as sediment, suspended solids, colloids and organisms such as algae in the water, and reduce the mechanical damage and pollution of reverse osmosis membrane elements.

Multi-media filters are widely used in the process of water treatment, and multi-media filters are mainly composed of the following parts: supporting pipelines and valves. Wherein the filter body comprises: cylinder again; backwash trachea; water distribution components; support components; filter media; Exhaust valve (external), etc.

Introduction to the structureMulti-media filters are widely used in the process of water treatment, and multi-media filters are mainly composed of the following parts: supporting pipelines and valves. The filter body comprises:

cylinder; backwash trachea;

water distribution components; support components;

filter media; Exhaust valve (external), etc.

The inner filter layer is composedThe multi-media filter material in the filter is high-quality homogeneous gravel, quartz sand, magnetite, anthracite and other filter materials, which are scientifically and orderly distributed in the filter tank according to their specific gravity and particle size, such as anthracite with small specific gravity and slightly larger particle size is placed in the top layer of the filter bed, quartz sand with moderate specific gravity and small particle size is placed in the middle layer of the filter bed, and gravel with large specific gravity and particle size is placed in the lowest layer of the filter bed. This ratio ensures that the filter will not produce a chaotic layer phenomenon when backwashing, so as to ensure the retention capacity of the filter material.

Precautions

1. The pressure should be stable during each test, and the pressure fluctuation should not exceed 5%, otherwise the test will be invalid.

2.The selected water sample size to be collected should be 500 ml (or other determined water value); The interval between the two water samples was 15 minutes.

3 If the T15 reaches 120 seconds, there is no need to carry out the T15 test, each unit should be tested 3 times a day, and the SDI value should be controlled below 4.

Precautions

1) Whether the filter is backwashed is judged according to the operating pressure difference and SDI value, a special SDI test tube is set on the filter outlet jellyfish pipe, and a pressure gauge is provided before and after the filter, and whether it is necessary to backwash according to the difference between the pressure displayed before and after. When the inlet and outlet pressure difference of the filter is greater than or the SDI value is greater than 4, the backwash of the multi-media filter should be carried out.

2) Pay attention to the amount of backwash water when backwashing, generally the amount of backwash water is between 4 times of the amount of water in the positive wash, usually choose 3 times.

3) Be sure to carry out air scrubbing when backwashing, and pay attention to the input strength of air when air scrubbing, generally 18-25L (S*M2) compressed air. The scrubbing effect is not very good if the strength is too small, and it is easy to leak the filter material if the strength is too small.

(1) The parallel tolerance between the outlet tank and the filter plate is required to be no more than 2 mm.

2) The levelness and unevenness of the filter plate are less than 1 5 mm. The structure of the filter plate is optimized by the overall processing. When the diameter of the cylinder is large, or when it is restricted by raw materials, transportation, etc., it can also be formed by two-petal splicing.

3) The reasonable treatment of the joint parts of the filter plate and the cylinder is particularly important for the air backwashing link.

In order to eliminate the radial gap between the filter plate and the cylinder caused by the error in the processing of the filter plate and the rolling of the cylinder, the arc ring plate is generally welded section by section. The contact parts must be fully welded.

The radial clearance treatment method for the central pipe and filter plate is the same as above.

Note: The above measures ensure that filtration and backwashing can only be communicated through the filter cap or pipe gap. At the same time, the distribution uniformity of the backwash and filtration channels is ensured.

4) The through-hole machined on the filter plate has a radial error of 1 5 mm. The increase of the fitting size between the filter cap guide rod and the through hole of the filter plate is not conducive to the installation or fixation of the filter cap. Mechanical equipment must be used for the machining of through-holes.

5) The material of the filter cap, nylon is the best, followed by ABS. Due to the addition of filter material on the upper part, the extrusion load on the filter cap is extremely large, and the strength is required to be high to avoid deformation. The contact surface (upper and lower surfaces) between the filter cap and the filter plate should be covered with elastic rubber pads.

Precautions for multi-media filter operation

1.Each step of the multi-media filter should not be opened by mistake during operation, so as to avoid some unnecessary losses caused by streaming;

2.When starting the pump, the multi-media filter must check the opening and closing status of the valve;

3.When the demineralized water system of the multi-media filter stage is in progress, the acid and alkali regeneration resin, the two resins should be operated synchronously;

4.When the multi-media filter is in normal operation, it is necessary to observe whether the data displayed by the flowmeter and pressure gauge are normal;

5.When cleaning the multi-media filter, water should not be sprinkled on the pump;

6.The exhaust valve should be opened first during the normal operation of the multi-media filter until the exhaust valve is closed after the water is discharged;

7.When all kinds of pumps are closed, the upper and lower valves should be closed in time;

8.When the multi-media filter is shut down, the pump needs to be closed first and then the valve is closed, and the pump is opened after the valve is opened when the machine is turned on.

Quartz sand mechanical filter is the earliest and most common one in the field of environmental protection and advanced sewage treatment. Quartz sand filtration is the most effective means to remove suspended solids in water, is an important unit in advanced sewage treatment, sewage reuse and water treatment, its role is to further remove the pollutants that have flocculated in the water, it achieves the purpose of pure water through the interception, sedimentation and adsorption of filter material.

Features of new quartz sand mechanical filter.

The new quartz sand mechanical filter has simple structure, convenient operation and maintenance, automatic control can be realized in operation, high filtration efficiency, low resistance, large processing flow and less backwashing times. It is widely used in pure water, food and beverage water, mineral water and electronics, printing and dyeing, papermaking, chemical industry water quality pretreatment and industrial sewage filtration after secondary treatment. It is also used for deep filtration of reclaimed water reuse system and swimming pool circulating water treatment system.

It also has a good removal effect on suspended solids in industrial wastewater.

The new quartz sand mechanical filter is a steel pressure filter, which can remove suspended solids, mechanical impurities, residual chlorine and color in the raw water, according to the different filter materials, the mechanical filter is divided into a single layer, a double layer, a three-layer filter material and a fine sand filter, the quartz sand filter material is generally a single layer of quartz sand, the particle size is, and the height of the filter layer is usually. According to the structure, it is divided into single-flow, double-flow, vertical and horizontal; According to the anti-corrosion requirements of the inner surface, it is divided into rubber-lined type and non-rubber-lined type.

Installation and operation of new quartz sand mechanical filter.

1. When filling quartz sand, the tightness of the filter cap must be carefully checked to ensure that each filter cap is tightened correctly before filling the quartz sand.

2. During the construction of the concrete foundation of the new quartz sand mechanical filter, the hole should be reserved according to the position of the filter foot hole, and the hoisting of the filter and the assembly of the connecting pipe should be carried out after the foundation reaches the design strength.

3. At the beginning of filter operation, the operation experience should be gradually explored according to the local water quality situation to determine the variety and amount of coagulant, and the opening of the drainage gate valve during backwashing.

4. During the operation of the filter, the turbidity of the inlet water shall not be higher than the index specified in the design, and the backwash shall be carried out according to the design requirements, otherwise it will cause the shortening of the operation cycle or the formation of mud balls in the filter layer, which will affect the effluent quality in serious cases.

5. When directly filtering, the coagulant should be prepared to a certain concentration and added before the pump.

Multi-media filter installation requirements.

For equipment with a tank diameter of less than 4 meters, the whole machine leaves the factory, and the on-site installation requirements are as follows:

1. The foundation is embedded anchor bolt equipment.

According to the design drawings, check the foundation qualification report, which must meet the requirements of the equipment operating load.

Check the center and size of the foundation reserved hole according to the design drawings.

Check the levelness of the foundation according to the design drawings.

Pre-install the equipment in place, level the steel plate under the base, install the anchor bolts on the equipment base, confirm the installation position of the anchor bolts, and fill the reserved hole with secondary grouting.

Install external piping.

According to the gradation of the filter material, fill the filter material, and the surface of the filter material should be flat, about higher than the filling height.

Commissioning and trial operation of multi-media filters.

1. Preparation before commissioning.

Learn how filters work.

The manhole of the device has been sealed.

The piping connections are in accordance with the process requirements.

The elevation of the backwash outlet main is more than 1 meter lower than the surface of the backwash outlet of the filter (if it cannot be satisfied, it cannot be commissioned, because the water will overflow from the manhole at the top of the filter during the commissioning process).

The valves of the equipment are working normally, and the valve configuration meets the process requirements.

The backwash pump meets the process requirements.

The backwash air meets the process requirements.

The instrument configuration meets the process requirements.

There is an abundant backwash water source.

There is plenty of space to store the backwash drain.

The filter and filter material are soaked for more than 8 hours.

2. Backwash debugging process.

Close all valves of the filter except the top exhaust valve.

The automatic valve of the backwash water inlet is fully opened, the backwash drainage valve is fully opened, and the manual valve of the backwash water inlet is opened about 1 4 first.

Hello, it is a pleasure to provide you with a multi-media filter.

1. Clarify the operating principle

The multi-media filter is made of lamellar anthracite.

Quartz sand and other materials are the bed, the top layer of the bed is composed of light and coarse grade materials, and the heavy and fine grade materials are placed at the bottom of the bed. The principle is that the larger particles in the water are removed at the top layer and the smaller particles are removed at the deeper part of the filter media.

That is, through the filter material inside the multi-media filter, the water quality is subjected to multi-layer physical adsorption filtration, so as to improve the turbidity and cleanliness of the water quality. In the boiler feed water, circulating water supplementary water, heating and air conditioning system.

There are mature and wide applications in make-up water and water purification and filtration for various industrial processes.

2. Internal structure composition

The internal structure of the multi-media filter is mainly composed of the filter body, supporting pipelines and valves. The filter body mainly includes the following components: simplified body; water distribution components; support components; backwash trachea; filter media; Exhaust valve (external), etc.

Interior drawing of a multi-media filter.

Diagram of the internal segment structure of a multi-media filter.

Structural diagram of multi-mediatronics fuel travel filter.

3. Operational requirements

a.After a long-term shutdown of the system, when it is reopened, the filter material should be washed for about 5 minutes until the effluent is clear.

b.After the initial operation or long-term shutdown of the system, when running again, the equipment should be vented: open the exhaust valve, water inlet valve, and then enter the water until there is no air in the exhaust valve V8 discharge water (some small filters do not set the exhaust valve separately, and the water outlet can be used for exhaust).

c.For large filters, air scrubbing can be used to enhance the backwashing effect, generally through compressed air (strength 10-18 l), and then air-water backwashing.

d.The backwash intensity of the equipment should be controlled, and activated carbon should be avoided.

Flush the leak out of the system.

e.According to the quality of the inlet water, the activated carbon filter material should be replaced regularly, generally once every 3-6 months.

I hope that the knowledge of the internal structure of multi-media filters introduced above can help you. Thank you!

How does a multi-media filter work.

As one of the industrial water quality pretreatment equipment, multi-media mechanical filter plays a very important role in the water treatment circulation system.

The multi-media filter generally adopts the water production mode of upper in and lower output, and also uses the water production mode of lower in and upper output in a small number of times, and the specific water production mode is mainly determined by the water quality requirements and process design.

Multi-media filters.

According to the process design, it can be divided into semi-automatic and fully automatic, and the automatic multi-media filter only needs to set the corresponding parameters in advance, and can automatically carry out the filtration, washing, backwashing, air scrubbing and other processes of the multi-media filter. The imitation operation principle of multi-media filter backwashing is the opposite of the operation principle of filtration, which can effectively remove pollutants in the filter media and improve the service life of the filter material slag pie.

A multi-media filter is an external pressure filtration device. Its operating principle is that the raw water is pumped into the filter tank through external pressure, and then through the water distributor, the raw water is evenly sprinkled on the filter material. The raw water passes through the layers of filter material from top to bottom, and the pollutants larger than the pore size of the filter material are intercepted on the filter material, and the clean raw water is finally discharged from the lower outlet after filtration.

There are many types of filter materials inside the multi-media filter, mainly quartz sand, activated carbon, anthracite, softened resin, coconut shell, etc., which have a good effect on removing suspended solids, colloids, sediment, clay and humus in raw water. It can effectively reduce the turbidity of raw water, and the filter material inside the multi-media filter tank can be used many times after backwashing, and the filter material has a long service life.