The difference between volute dewatering screw press and plate frame filter press

Since the plate frame can be used, it has many advantages so far, such as: relatively complete technology, high extrusion power, low mud cake moisture content, easy to use for the treatment of organic sludge, etc. There may be advantages and disadvantages, such as: the filter frame feeder is easy to block, the mud cake is not easy to remove, it cannot be operated continuously, the amount of mud produced is small, and the square plate of ordinary raw materials is not easy to withstand pressure. The filter cloth of the filter machine consumes a lot of money, there is no way for the plate and frame to be unmanned, and the filter cloth of the filter press often needs to be cleaned manually, which is not suitable for processing oil-soluble sludge.

Since the volute dewatering screw press can be adopted by many customers in a short period of time, there may be reasons for many industries to gradually replace other filter press machines and equipment, for example: the application industry is widespread, It is suitable for the dehydration of high and low concentration sludge. The design of the dewatering machine is exquisite, and it occupies a small area. It does not need to build extraction tanks and storage tanks, which reduces the cost of basic construction, reduces the release of phosphorus and the emission of anaerobic fermentation waste gas. cause. It does not block and has the function of self-cleaning, especially suitable for the treatment of oil-soluble sludge. There is no need to clean the filter joints to avoid blockage, reduce the water demand for cleaning, and reduce the burden on the internal circulation of the vehicle. Low speed ratio, low power consumption and low noise. It is easy to use, has a high degree of automation technology, and saves labor. Use these for a long time. Disadvantages: not longer than silt with large particles and high strength. Volute screw press sludge treatment equipment has been introduced to China for a relatively short period of time, and there is no established industry standard, so manufacturers vary in quality.

1. Under the same standard (such as the output power of the infusion pump and its working hours, etc.). The plate-type chamber filter press can use the external force of mechanical equipment to reduce the capacity of the mouth of the filter plate of the filter press, squeeze the water in the filter residue, and further reduce its water content.

2. At present, the water content of the filter residue of some well-known brands of box filter presses in various countries decreases with the increase of working hours of infusion pumps. From the working hours of infusion pumps - characteristic curves of water content of filter residues, the working hours of infusion pumps - characteristic curves of water content of filter residues are very similar. Among them, in the first 3 hours when the infusion pump started to work, the water content of the filter residue decreased significantly, from the initial 99% to about 82% (the reduction rate reached 17%), and then the bottle pump started to work again For about 5 hours, its water content will drop to about 75% (the reduction is only 7%). The plate-type box filter press makes full use of the characteristics of the working time of the infusion pump - the characteristic curve of the water content of the filter residue. After the infusion pump works for 3 hours, it stops working, removes the rigid protective layer pad, and acts with external force. P3 squeezes a part of the water in the filter residue, so that the water content of the filter residue can be quickly reduced to about 75%, which greatly reduces the time for the filter residue to leave the filter plate-filter frame of the filter press, and improves the working efficiency. It can be seen that the plate filter press is a green product with environmental protection, energy saving and high efficiency.

The plate and frame filter press is formed according to the extrusion of the plate and frame, so that the water in the sludge is discharged according to the filter cloth of the filter press, so as to achieve the purpose of dehydration. It is mainly composed of concave filter plate, frame structure, automatic-pneumatic closing system testing plate hanging system, filter plate vibration system, high pressure air equipment, filter cloth high pressure It is composed of cleaning equipment and a photoelectric protection device on one side of the shell. Its advantages are: low price, high solid content of mud cake; disadvantages: continuous operation, large land occupation, high maintenance frequency. Therefore, most sewage treatment stations do not use this machine now.

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