The diaphragm Filter Press is a very important equipment in sludge dewatering. It is suitable for solid-liquid separation of various suspensions. It has the characteristics of good separation efficiency, safety and reliability, and easy operation. It is widely used in urban and rural domestic sewage treatment and disposal, industrial wastewater treatment and other fields that require solid-liquid separation. The use of diaphragm pressing technology can significantly improve the dewatering efficiency of the filter press, with obvious energy-saving and emission reduction effects, and can achieve the requirements of sludge dewatering treatment reduction, stabilization, harmlessness and resource utilization. Therefore, the diaphragm filter press has broad development prospects in the field of sewage and sludge treatment.

In sludge dewatering technology, the diaphragm filter press is a very important component. The pressing process of the sludge dewatering diaphragm filter press is mainly divided into three stages: sludge pretreatment, sludge filtration and mud cake diaphragm pressing. Sludge pretreatment, dosing and stirring devices are the main equipment for sludge pretreatment. Sludge treatment technology is to add an appropriate amount of flocculants and other pretreatment agents to the sludge sewage, and add them to the sludge storage tank after stirring evenly. After chemical reaction, the characteristics of sludge sewage will be improved, so that the sludge components contained in the sewage will be quickly concentrated to form solid particles, so that the solid content in the sewage meets the requirements of filtration, so that it is easy to form a filter cake layer in the filter chamber, creating good conditions for improving filtration efficiency.

Sludge dewatering filtration uses a feed pump to pump the sludge into the filter press, uses the pressure of the feed pump to filter and form a mud cake in the filter chamber of the filter plate. The use of diaphragm filter plate pressing process can greatly improve the efficiency of sludge dehydration. Under normal circumstances, the water content will not exceed 55%. Since the sludge has a high water content, a large volume, and is fluid, after dehydration by the diaphragm pressing process, the sludge volume is reduced to a dozen times the original, and it is converted from liquid to solid, which is convenient for transportation and subsequent treatment and utilization. Advantages of sludge dehydration diaphragm filter press

The filter chamber of the diaphragm filter plate adopts a reinforced polypropylene filter plate, which has excellent chemical resistance and fatigue resistance. The diaphragm sheet of the diaphragm filter plate that can be bulged on both sides adopts a one-time molding technology. Its filtration flow channel is a scattered distribution of equidistant convex points, which significantly increases the strength of the diaphragm and the bulging stroke, increases the filtration speed, and can effectively prevent filtrate residue. Due to the use of diaphragm pressing technology, the filtration efficiency is improved and the filtration cycle is shortened. Using diaphragm pressing technology, the moisture content of dehydrated sludge can reach 50-58%, which increases the sludge dehydration rate and greatly reduces the secondary treatment volume of sludge.

The diaphragm pressing technology of the diaphragm filter press is to use the filter chamber filtration unit composed of filter plates, diaphragm filter plates and filter cloth. Under the condition that the oil cylinder presses the filter plates, the materials are separated into solid and liquid under the pressure of the feed pump. After the feeding is completed, the filter cake is pressed by the diaphragm pressing technology, which can significantly improve the dehydration efficiency of the filter press and achieve obvious energy saving and emission reduction effects. The sludge dehydration diaphragm filter press has the advantages of fast filtration speed, high degree of automation, stable performance, convenient operation, high temperature and high pressure resistance of the filter plate, good corrosion resistance and sealing performance, high dehydration rate of the filter cake, uniform and thorough washing, and non-toxic filter plate.

Application of diaphragm filter press in sludge deep dehydration industry

Due to the use of advanced diaphragm pressing technology, the moisture content of the filter cake is significantly reduced. Generally, the moisture content of the filter cake is 50-58%. The filter cake is hard and blocky. It does not need to be dried. It can be directly landfilled, incinerated, made into bricks and used as green fertilizer, etc., which significantly reduces the sludge storage area, greatly saves transportation costs, improves land use efficiency, and realizes a circular economy. The moisture content of the filter cake is significantly reduced, and the water taken away by the filter cake is significantly reduced. The filtered water can be reused as reclaimed water, saving precious water resources.

Therefore, the diaphragm filter press will be widely used in the sludge deep dehydration industry. With the development of technology and the market, especially in the era of information development, all industries attach great importance to economic and environmental benefits, and make people fully aware of the importance of environmental protection. In order for products and technologies to be recognized by users, they need to go through many processes, and this is especially true for diaphragm filter presses to be widely used in the sewage sludge treatment industry. According to user feedback, the sludge dewatering efficiency has been greatly improved after using the Membrane filter press, achieving good economic benefits and receiving unanimous praise from users.