With the deepening of people's understanding of environmental pollution control and the increasing environmental pollution, sewage treatment plants have been built and put into operation in major cities. Effectively solving the problem of sewage sludge treatment and disposal has become an urgent task. thing. Considering that sludge is a kind of resource, some countries have begun to limit the direct landfill of sludge, and the cost of landfilling has risen, which has triggered the market demand for deep sludge treatment, reduction, and resource recycling. The proposed restrictions include: the water content of the sludge landfill must be less than 50%; the organic matter content is less than 30%; As a mature dewatering equipment, filter press is widely used in the field of environmental protection and has become an important equipment for sewage sludge treatment. Backup Camera For Car,Reverse Camera For Car,Rear View Camera,Rear View Mirror Camera Shenzhen Zhitong Yingchuang Electronic Technology Co., Ltd. , https://www.visualdriving.com
Mechanical dewatering of sludge is mainly to remove the capillary water between sludge particles. The water content of sludge after ordinary mechanical dehydration is usually 65% ​​to 80%, and it is mud cake-like after dewatering.
In the past, mechanical dewatering equipment mainly consisted of belt filter presses, plate and frame filter presses, and decanter decentralized centrifuges. Nowadays, they are commonly used in car filter presses, diaphragms, etc.
When sludge is used for landfilling, sludge dewatering can greatly reduce sludge accumulation sites and save costs during transportation. When sludge is composted, sludge dewatering can ensure the smooth progress of composting (General requirements for composting Sludge has a low moisture content); if sludge is incinerated, high sludge dehydration rate can greatly reduce heat energy consumption.
However, the sludge composition is complex, the relative density is small, the particles are fine, and it is often a colloidal state, which determines the characteristics of its dehydration, so so far. The further improvement of the degree of sludge dewatering is a hot topic at home and abroad.
Belt pressure filter and low electrical consumption. The moisture content of filter cakes in plastic plate and frame filter presses is low, but the decanter centrifuges have strong adaptability to sludge flow fluctuations, good sealing performance, large processing volume, and small footprint. In the past, most of China's sewage treatment plants used centrifuges, belt filter presses, and plate and frame filter presses. Small-scale sewage treatment plants generally used a concentration and dehydration machine. The commonly used chamber type filter presses, diaphragm filter presses, and the latest sludge dewatering technology Xiangyuan high-pressure metal plate frame machine, sludge treatment cost is low, this machine is a patented product developed and produced by Hangzhou Xiangyuan Filter Co., Ltd. Unique technology is the ideal equipment for sludge dewatering.
Belt filter press: It can work continuously. The belt press dewatering machine has 3 working areas, namely gravity dehydration zone, wedge-shaped press dehydration zone and shear press dewatering zone. The press type belongs to two-dimensional press and is mainly used for contamination. Dewatering mud, but its application is expanding. The dewatering effect of the belt filter press is more dependent on chemical agents, resulting in higher sludge treatment costs.
Plate and frame filter presses: intermittent pressure filtration equipment for solid-liquid separation of various suspensions.
Chamber filter press: It was developed after the 1960s. Its characteristic is high filtration pressure, the maximum pressure has reached 4.5MPa; single filter area is large, there are 2050 square meters of products available abroad, the domestic maximum filtration area has reached 2,000 square meters, the filter cake contains low volume of liquid, the filter after pressing Cake moisture content can be reduced by 5% to 15%; Corrosion resistance is good, filter plate can use a variety of enhanced plastics, light weight, good elasticity, corrosion resistance, wide adaptability; low operating costs, can achieve multiple consecutive Job, online control. Modern filter presses are mainly based on van type.
Diaphragm Filter Press: intermittent pressure filtration equipment for solid-liquid separation of various suspensions. The filter press is equipped with a rubber press diaphragm to dewater the filter cake. The medium for expanding the diaphragm may be compressed air (used at a pressure of 0.7 MPa or less) or water (used at a pressure of 0.7 MPa or more).