The role of belt filter press in sludge

      Sludge is an inevitable product of sewage treatment in sewage treatment plants and sewage stations. After the sludge that has not been properly treated and disposed of enters the environment, it directly brings secondary pollution to the water body and the atmosphere, and poses a serious threat to the ecological environment and human activities.

Sludge treatment can be divided into sludge dewatering process and sludge drying process. The following mainly introduces the respective advantages of different types of sludge dewatering machines. The sewage will produce a large amount of sludge after sedimentation treatment. Even if it is concentrated and digested, the water content is still as high as 96%. The volume is very large and difficult to absorb and dispose. It must be dehydrated to increase the solid content of the mud cake to reduce the pollution. The area occupied by mud piles.

Generally, large and medium-sized sewage treatment plants use mechanical dehydration. There are many types of dehydration machines, which can be divided into three categories: vacuum filtration dehydration, press filtration dehydration and centrifugal dehydration according to the dehydration principle. This article discusses the working principles of filter presses (including belt filter presses and plate and frame filter presses) and centrifugal dehydrators that are often used in domestic sewage treatment plants, issues that need to be considered when selecting equipment, and maintenance and operation costs. Make an introduction.　　

　　1, the belt filter press is less affected by sludge load fluctuations, and has the characteristics of low sludge water content, stable work and low consumption, relatively simple management and control, and low requirements for the quality of operating personnel. At the same time, because the belt filter press dehydrator entered the country earlier, a considerable number of manufacturers can produce this equipment. When making decisions on construction of sewage treatment projects, belt filter presses can be used to reduce project investment. At present, most of the newly built sewage treatment plants in China use belt filter press dehydrators. For example, the five dehydrators of the first phase of the Beijing Gaobeidian Sewage Treatment Plant are all belt filter press dehydrators. Since the filter belt and roller press were put into operation The situation is good, so this model was still used in the equipment selection of the second phase.　　

2. Compared with other types of dewatering machines, the general plate and frame filter press has a higher solid content rate of mud cake, up to 35%. If you consider the factor of reducing the land occupation of sludge stacking, the plate and frame filter press should be First recommended program. How the filter plate moves. The requirements can be completed automatically or semi-automatically by a hydraulic-pneumatic device, which is inconvenient to operate. The filter cloth oscillation device can make the filter cake easy to fall off. Compared with other types of dehydrator, the disadvantage of a larger plate and frame filter press is that it occupies a larger area.

The belt filter press used in the first phase of the sewage treatment plant is compared with the plate and frame filter press used in the Anshan Industrial Sewage Treatment Plant as an example: the sewage treatment plant has a sewage treatment capacity of 500,000 t/d, and the sludge dewatering machine sludge The output is 1852.5m3/d, and the dry matter is 92.63t/d. It uses five German klein-ks30 belt filter presses. The basic area of ​​each filter press is only 2750*3500mm. The water treatment capacity of Anshan Sewage Plant is 22t. /d, dry matter 275t/d, using six plate and frame filter presses, each filter press covers an area of ​​2400*12000mm, and at the same time, because the plate and frame filter presses run intermittently, the efficiency is low , The operating room environment is poor, there is secondary pollution, and the domestic large-scale sewage treatment and measurement plants have rarely used it.

      Doyen specializes in providing belt press equipment for the Southeast Asian market. Welcome to visit our workshop and formulate a more scientific  plan based on the actual situation of your company. Welcome to visit joyce@doyenchina.com or visit https://www.doyenchina.com.