With the development of modern industry and the requirement of energy conservation and environmental protection, enterprises have put forward higher requirements for
Solid-liquid Separation technology and equipment. In the automotive painting process, a phosphating process is used before painting to improve the adhesion and corrosion resistance of the coating. However, sediment will inevitably be generated during the phosphating film formation process.
This is because: on the one hand, only part of the dissolved iron on the steel plate can participate in film formation, and the other part will inevitably be oxidized into ferric iron, and ferric iron is easy to form precipitation; on the other hand, the proportion of phosphating liquid is controlled. Improper use will result in excessive precipitation of zinc phosphate. If there is too much sediment in the tank liquid, it will not only contaminate the chemical liquid, shorten its service life, increase the number of tank pouring and cleaning, and increase operating costs, but these sediments will also adhere to the surface of the workpiece, affecting the coating quality of the entire vehicle. If it is brought into the electrophoresis tank, it will also affect the stability of the electrophoresis solution and shorten the service life of the ultrafiltration device. If spray phosphating is used, the phosphating slag will easily block the nozzle and nozzle. Therefore, the content of phosphating slag cannot exceed a certain amount (generally controlled below 0.3 g/L), and the slag must be removed in time
The filter press is an excellent solid-liquid separation equipment. It adopts positive pressure and high pressure dehydration. It has the advantages of less moisture in the filter cake, low energy consumption, clear and transparent filtrate, and no flocculant can be added in one ship. It is widely used in the industry.
The sludge treatment plant uses Membrane Filter Press pressing technology, which reduces the moisture content of the filter cake. Generally, the moisture content of the filter cake is 50% ~ 58%. The filter cake is hard and lumpy, and does not require drying treatment. It can be directly Landfilling, incineration, brick making and greening fertilizers, etc., reduce sludge storage sites, significantly save transportation costs, improve land use efficiency, realize circular economy, reduce the water content of the filter cake, and significantly reduce the moisture taken away by the filter cake. Reduced, filtered water can be reused as reclaimed water, saving precious water resources.
Therefore, membrane filter press will be widely used in the sludge deep dewatering industry. With the development of technology and market, especially in the era of developed information, all industries attach great importance to economic and environmental benefits, which has also made people fully aware of the importance of environmental protection. Products and technologies need to go through a lot of processes to gain recognition from users, and this is especially true for membrane filter presses to be widely used in the sewage sludge treatment industry.
The manufacturing technology of the domestic filter press industry has progressed rapidly, and the technical content and quality of the products have been greatly improved. The gap with foreign countries is getting smaller and smaller. The manufacturing level of large and medium-sized filter presses has approached or reached the foreign level, and the membrane filter technology has also been improved. In line with the synchronous development, domestic roller rolling machine technology is becoming increasingly mature and has gained good popularity. With the improvement of the technology and quality of domestic membrane filter presses and the rapid development of the sludge dewatering industry, membrane filter presses are widely used in most sewage treatment plants. According to user feedback, after using the membrane filter press, the sludge The dehydration efficiency has been greatly improved, good economic benefits have been achieved, and it has been highly praised by users.
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