Water-contained material pressing and dehydrating method and device

Abstract

The invention relates to a water-contained material pressing and dehydrating method and a device. Water-contained materials are simultaneously conveyed to all the filter bags of a pressing device through a feeding device, an air bag or a water bag is utilized to press the filter bags for pressing and dehydrating the materials, and the dehydrated materials are simultaneously discharged from the lower ports of the filter bags under the action of gravity. The device presses and dehydrates the materials which have high solid contents, and has high feeding and discharging speeds, and has the characteristics of high efficiency, simplicity in operation and the like.

Description

technical field [0001] The invention relates to a method and device for pressing and dehydrating water-containing materials, and belongs to the dehydration technology in the fields of water treatment and solid waste treatment. Background technique [0002] Food residues in the production process of bean curd residue, shochu and soy sauce, cassava starch residue produced in the production process of cassava starch, solid waste discharged from biological fermentation, and sludge and coal slime produced in the biological treatment process of organic wastewater are often vacuum Filtration, pressurized filtration, centrifugal separation and other methods to achieve dehydration, due to the high solid content of cassava starch residue, bean curd residue, coal slime and press-filtered sewage plant sludge, which is paste-like and poor in fluidity, the existing mechanical dehydration It is difficult for the device to achieve high solid content feed, and the solution is often to add wa...

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Problems solved by technology

[0002] Food residues in the production process of bean curd residue, shochu and soy sauce, cassava starch residue produced in the production process of cassava starch, solid waste discharged from biological fermentation, and sludge and coal slime produced in the biological treatment process of organic wastewater are often vacuum Filtration, pressurized filtration, centrifugal separation and other methods to achieve dehydration, due to the high solid content of cassava starch residue, bean curd residue, coal slime and press-filtered sewage plant sludge, which is paste-like and poor in fluidity, the existing mechanical dehydration It is difficult for the device to achieve high solid content feed, and the solution is often to add water to dilute, resulting in complicated procedures and increased mixing costs, etc.

[0003] In addition, in the high-dry dewatering of sludge, after the sludge is conditioned, the water content of the sludge can be reduced to below 60% by using a diaphragm sludge press and high-pressure air to dehydrate the sludge, but this The operation cycle of the method is long, and each operation cycle takes 2-4 hours (in which the feed and discharge account for 1-2 hours), and the efficiency is low. If the dehydrator with higher efficiency can be used in the early stage to dehydrate to about 80%, it can be used at the same time It will greatly improve the efficiency of the whole process

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