Which material is good for the filter cloth of the plate and frame filter press of the sewage treatm

How often should the filter press cloth be changed? There are no strict standards and regulations for the service life of filter cloths, and more needs to be judged according to the site conditions. The average service life of the filter cloth of the filter press is about 6-10 months, but it depends on the use of the filter cloth.

The service life of the supporting filter cloth of different filter press equipment (vacuum horizontal belt filter, vertical filter press, plate and frame filter press, high-energy plate and frame filter, rotary drum filter, centrifuge, etc.) is not the same, depending on the filter equipment and working environment. If you're wondering how often should you change the filter press cloth? "If you have doubts, then it is recommended that you choose a regular filter cloth manufacturer for consultation.

Taking Bolian Filtration as an example, a specialized and special new community enterprise focusing on the R&D, customization and production of various types of industrial filter cloths, can match a variety of filtration equipment and liquid-solid separation...

This problem also occurs when our thickening tank is pressed by the folding machine, and we directly add lime milk to the sludge thickening tank to solve it, and the effect is more obvious and the effect is fast.

As questioned: What kind of material is good for the filter cloth of the plate and frame filter press in the sewage treatment plant?

Polypropylene filter cloth material properties: acid resistance, alkali resistance, good wear resistance, good conductivity, recovery slightly better than polyester, bad corrosion resistance. polypropylene staple fibers, short fibers, spun yarn ribbon hair; Polypropylene long fiber, long fiber, the formation of smooth yarn, so polypropylene staple fiber weaving of industrial cloth, cloth surface hair, powder filtration and pressure filtration effect are better than long fiber.

The industrial cloth made of polypropylene long fiber weaving has a smooth cloth surface and good air permeability. Polypropylene filter cloth use: chemical, ceramic, pharmaceutical, smelting, manufacturing, mineral processing as filter bottom.

Filter cloth**. <>

Broadly distinguished, the plate and frame filter press on the market is mainly steel filter plate, reinforced polypropylene filter plate two categories, reinforced polypropylene is the mainstream product on the market, the general polypropylene filter plate has native and regenerated, the original strength is relatively large, white, the quality of regeneration is not very good, it contains variegated colors (in the past, we bought the filter press filter plate in Henan is often broken, and later bought Chengdu Changjie filter, I took a closer look, it seems that the gap between the filter plate is quite large), However, the specific use environment is also related, and the high acid content and high temperature in some places will also cause the filter plate material to age rapidly.

It is currently the most commonly used, that is, polymer polypropylene. This material is very resistant to a wide range of acids and alkalis, including the strongest acid, hydrofluoric acid. However, the operating temperature range is relatively small. It can only withstand materials of up to 70°C for a short period of time.

It is an organic material with the best acid resistance and temperature resistance, and the normal temperature resistance can reach about 150°, but the alkali resistance is extremely poor.

3.Natural rubber filter plates, especially diaphragms, are still good with natural rubber, with good elasticity, but poor strength.

4.Aluminum filter plates, the lightest of all metal filter plates, but relatively less resistant to acids.

5.Cast iron filter plate, heavy weight, poor acid resistance, extremely high temperature resistance. It's just that the sealing surface must be made of organic materials, so there are certain limitations.

6.Stainless steel filter plate, acid and alkali resistance is good, but ** is the largest among all filter plates, after all, the material itself is expensive, and the machining time is very large.

Plate and frame filter press is a common sludge treatment equipment. It has the advantages of large filtration driving force, high solid content of filter cake, clear filtrate, high solid rate, and high consumption of conditioning drugs, and is generally used in small sewage plants. Below, Hu Ning will introduce the design requirements of the plate and frame filter press!

1) The filtration pressure is about 4 6kg cm2);

2) The filtration cycle is not more than 4h;

3) Each filter can be equipped with a sludge pressure pump, and the pump should be a plunger type;

4) The volume of compressed air is not less than 2m3 min per 1m3 filter chamber (calculated according to standard working conditions);

5) Attention should be paid to good ventilation, high-pressure flushing system, sludge grinder setting before conditioning, mud cake crusher setting after filter pressing, etc.

The design method of filter press dewatering is mainly based on the sludge treatment capacity, dewatered sludge concentration, filter press working procedure, filter pressure and so on to calculate the mud cake yield, the required filter press area and the number of units.

As questioned: What are the materials of the filter plate of the plate and frame filter press?

1. Rubber filter plate and filter frame.

Rubber is a good acid and alkali resistant material, but its practicality is limited by temperature, generally not greater than 75, and there is aging phenomenon.

2. Plastic filter plate.

The plastic filter plate used in the plate and frame filter press is an improved polypropylene plastic filter plate, in which auxiliary materials such as filler, toughening agent, and anti-aging agent are added, so that it has good advantages.

3. Glass filter plate.

The glass filter plate is the form of glass fiber reinforced plastic made of synthetic resin glued material, and its strength is increased by glass fiber. Such filter plates have the following advantages: light weight and high strength; Resistant to corrosion of acid, alkali, salt and other media, and has a long service life; The temperature of the filtrate can be about 100 °C, and the heat resistance is good.

The disadvantage of it is that it is the same as plastic, it has to age, but it is slower than plastic.

4. Wood filter press filter plate.

The wood filter plate is generally made of shirt wood, which has good sealing and is not easy to leak. It is more convenient to manufacture and process, and the weight is lighter than the worries of other materials, which is convenient for transportation and movement. The disadvantage is that the strength of the wood itself is not high, so the filter plate made is easy to be damaged, and it is easy to be corroded during the use period.

The filter cloth of the filter press is the equipment used for the filter press to filter sludge food, and it is generally made of the following materials.

1. Polyester filter cloth Polyester filter cloth is acid resistant and weak alkali resistant. Good abrasion resistance, corrosion resistance, good recovery, poor electrical conductivity, temperature resistance is between 130-150 degrees Celsius.

2. Nylon filter cloth Nylon fiber has abrasion resistance, strong alkali resistance, and weak acid, but it is easy to change color, and it should not be exposed to sunlight.

3. Polypropylene filter cloth can be divided into two types: polypropylene staple fiber filter cloth and polypropylene long fiber filter cloth.

4. The strength of vinylon filter cloth is worse than that of polyester, the shape of the fabric is poor, the wear resistance is better, and the durability is 1-2 times that of pure cotton. It can withstand the action of strong alkali, good hygroscopicity, easy to combine with rubber, is a good material for use in the rubber industry, is not resistant to high temperature, the temperature does not reach 100 degrees Celsius, it will shrink, and it is not acid-resistant.

The filter cloth material is divided into polypropylene filter cloth, polyester filter cloth, nylon filter cloth, vinylon filter cloth, polyester mesh, and the safety purpose can be divided into liquid filter cloth, air filter cloth, conveyor belt, with test filter cloth, and 750B 108C 750AB monofilament filter cloth is used for general sewage treatment.

As questioned: What materials are there for filter press filter cloth?

Filter cloth mainly includes: polyester filter cloth for filter press, polypropylene filter cloth for filter press, nylon filter cloth for plate and frame filter press, and vinylon filter cloth for plate and frame filter press.

First, the details of the filter press.

There is a difference in the handling of the filtration details. The filter plate of the plate-and-frame filter press can be divided into two kinds, a solid filter plate and a plate-and-frame filter plate, there is a feeding channel in the corner of the filter plate, which divides the filtrate into the filter chamber, and a hollow plate frame is sandwiched between the two solid filter plates, and the filter cloth is inlaid on the plate frame, so that the filtration structure of the plate-and-frame filter press is formed. This is also the origin of the name of the plate-and-frame filter press.

Each filter plate of the chamber filter press will be the same (except for the plate and push plate that have the same place), the top of the filter plate is concave to form a space for storing the filter cake, and the filter cloth is poured on both sides respectively, and the middle is connected. The fit of such a filter plate and the filter cloth is connected with several filter plates and filter cloth of the same structure, so that the filter cloth space like the gourd string is formed, which is the filter chamber of the chamber filter press.

Second, the usability of the filter press.

Starting from the comparison of the details between the chamber filter press and the plate and frame filter press, the specific comparison between them in the temperature of the filter, the shape and hardness of the solids, the chamber filter press can filter the hard mixture, in terms of filtration concentration, the plate and frame filter press has its advantages, and the quality difference between them, the moisture of the filtered filter cake plate and frame filter press is lower than that of the chamber filter press. 、

3. Differences in the design details of the filter plate.

The difference in the use of the chamber filter press and the plate and frame filter press, then they also have detailed differences in the design and manufacture of the filter plate for these reasons, the string filtration method used by the chamber filter press, each solid filter plate is connected, and the filter cloth is sandwiched in the middle to form a filter chamber. The filter plate of the plate-and-frame filter press is a hollow plate and a solid filter plate that cooperate with each other to form a filtration combination, and the filter plates of the plate-and-frame filter press are cross-arranged with each other. That's why they use performance differences.

The two are the same thing. Both are a traditional, solid-liquid separation equipment.

The main thing is to look at the front, the "board frame".

The earliest filter press is indeed a box + a plate + frame + plate... Row into a filter chamber. This is where the name of the plate and frame filter press comes from.

In this form of filter plate, when the filter plate is pulled open to unload the cake, the filter cake will not fall easily due to the holding effect of the frame on the filter cake. It is necessary to manually intervene in unloading the cake. So, let's design the current filter plate look.

Only with this filter plate is it possible to use an auxiliary cake unloading device that automatically detachs the cake from the filter plate, thus making fully automatic operation possible.

Plate and frame filter press filtration, its simplest description of practicality, is that there are two middle concave filter plates, the surface is coated with filter cloth, and the cavity formed by pressing is compacted, also called the filter chamber or chamber, which is lined into a filtration space, and the filter cloth is used as a filter medium to achieve solid-liquid separation.

When the initial feeding is completed, the mud cake formed on the surface of the filter cloth will be denser than the filter cloth, and the subsequent filtration is achieved by this layer of filter cake.

The energy to overcome the resistance of the filter channel comes from the pump that transports the material, and from the formal point of view, it is the increase in pressure.

Therefore, when combined, this combination is called a plate and frame filter press.

In fact, the plate and frame filter must also have pressure, otherwise it will not be able to successfully filter in the end.

That's why these two devices are the same thing.

As questioned: How to choose filter press filter cloth? What are the materials?

How often should the filter cloth be replaced?

The filter press is exposed to acid and alkali corrosion, mechanical wear and the aging of the filter cloth itself during use, resulting in the life limit of the filter cloth of the filter press. According to the sludge treatment experience of Lianyungang Mingke, the filter cloth life of the filter press used in the ceramic industry and the coal industry is about 3 months to 5 months, and the filter cloth life of the filter press used for sewage treatment will be relatively long. Once the filter cloth is damaged, it should be replaced in time to prevent affecting the treatment effect and subsequent processes.

What are the models of filter cloth for plate and frame filter press:

Vinylon filter cloth. Polyester filter cloth.

Nylon filter cloth. Polypropylene filter cloth.

Filter ** Reference.

It is divided into chamber filter press, belt filter press, and belt concentration and dehydration machine, which is commonly used in sludge and food, which was used in chemical production at the beginning of the 18th century, and is still widely used in chemical, pharmaceutical, metallurgy, dye, food, brewing, ceramics and environmental protection industries. The filter press is composed of multiple filter plates and filter frames superimposed to form a filter chamber, and the pressure is the filter driving force.

Filter press classification.

The filter press is intermittent operation, and there are three types of plate and frame filter presses, chamber filter presses and vertical filter presses. The filter plate has stable performance, convenient operation, safety and labor-saving, and the metal and plastic steel filter plate is precision casting, high temperature resistance, high pressure resistance, and durable.

Usage process. Because the filter press itself is of the same specification, the different filtration precision, speed, etc. required for different filtration objects are realized by using different filter press filter cloths, also known as filter press filter bags, each filter press filter plate is wrapped with filter cloth, according to the acid and alkali resistance requirements, tensile strength, filtration accuracy, filtration speed and other requirements of different filter objects, first determine the filter cloth material and model used, and then according to the size and shape of the filter plate, process the matching filter cloth bag, and put it on the filter cloth. So the filter cloth is the heart of the filter, and the same is true in the filter press.

The selection of filter cloth is generally to choose weak alkali resistance, wear resistance, high corrosion resistance, high peeling ability, light texture, high porosity, through twisting, the strength can be higher.

Materials: polyester, vinylon filter cloth, nylon filter cloth, polypropylene filter cloth.