The national policy of China Drying Network Reciprocal Co., Ltd. has lower and lower requirements for sludge moisture content, conforming to national policies and guidelines is an inevitable trend of technological development, and at the same time, it provides efficient and reliable solutions for the owners from the perspective of the actual economic benefits of customers. It is the responsibility of the professional operating company, and it is also the direct cause of the development of the “high-efficiency sludge dehydration and drying technology ”.

Sludge disposal in the traditional way will generally directly transport landfills, often with hidden environmental risks. After sludge dewatering treatment, because of the low moisture content and high degree of solidification, the scope of application for disposal is expanded. For example, the residue produced can be used as soil improver and greening soil; it can be directly used for incineration, drying, composting, etc.; after the moisture content of the sludge is reduced to below 60%, the sludge has been hardened into blocks and transported. Leakage and spillage will not occur during the process, even when the plant is in bulk, it will be convenient and will not emit odors to avoid secondary pollution of the environment. The extensive disposal application provides a good docking solution for upstream and downstream of the sludge treatment and disposal industry chain.

Various types of sewage treatment plants and waterworks will produce different types of sludge in different quantities. Whether the application area is extensive is an important indicator to measure the quality of sludge dewatering devices. The design of the device considers the scope of application, and can be widely applied to various types of municipal wastewater treatment plants, water supply plants, iron and steel, printing and dyeing, food, petrochemical and other industrial wastewater treatment plants, even if the special oily sludge requires only additional adjustments. Quality components and pharmaceuticals can also meet production and operation requirements. Regarding throughput, Wang Zhenghong stated that our plant is more suitable for sewage treatment plants with dry-based sludge volume ranging from 5 tons to 50 tons per day.

According to statistics, sludge production in China is close to 22 million tons per year, of which 80% has not been properly handled. At present, the status quo of “heavy water and light mud” in China has not changed, and sludge disposal has not yet formed a truly mature operation mode. However, as technology continues to mature and favorable policies are continuously released, the large market for sludge disposal is also quietly Brewing, "The Twelfth Five-Year National Urban Wastewater Treatment and Recycling Facilities Construction Plan" pointed out that sludge treatment and disposal facilities will invest 34.7 billion yuan. Sludge dewatering is an important intermediate link in sludge disposal, and its importance is self-evident. Enterprises should seize the favorable situation and use policies to “strengthen” to expand the scale and promote the brand.

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Sludge dewatering and drying equipment

Common sludge dewatering and drying equipment :

1. The working principle of the plate-frame sludge dewatering machine: In the confined state, the sludge injected by the high-pressure pump is pressed by the plate frame, so that the water in the sludge is discharged through the filter cloth to achieve the purpose of dehydration. Advantages: Low price, good at dehydration of inorganic sludge, mud cake moisture content is low. Disadvantages: Easy to clog, need to use high-pressure pump, not suitable for dehydration of oily sludge, it is difficult to achieve continuous automatic operation.

2. Working principle of belt type sludge dewatering machine: Sludge layer is sandwiched by upper and lower two strained filter belts, and S-shaped flow passes through a series of regularly arranged roller cylinders, and the sludge is formed by the tension of the filter belt itself. The squeeze and shear forces of the layers squeeze out the capillary water in the sludge layer to achieve sludge dewatering. Advantages: The price is low, it is currently used widely and the technology is relatively mature. Disadvantages: It is easy to clog, requires a lot of water to clean, causing secondary pollution.

3. Centrifugal sludge dewatering machine is composed of transloaded and screw conveyor with hollow shaft. Sludge is fed into the rotating drum through the hollow shaft. Under the centrifugal force generated by high-speed rotation, production is thrown into the drum cavity. Since the specific gravity is different, solid-liquid separation occurs. Sludge is driven by the screw conveyor, and is transported to the cone end of the drum continuously from the outlet; the liquid in the liquid ring layer is discharged continuously by the overflow port to the outside of the drum by gravity. Advantages: Large processing capacity. Disadvantages: Large power consumption, large noise, and severe vibration; maintenance is difficult and is not suitable for solid-liquid separation with a close proportion.

4. The Tied sludge dewatering machine fixed ring and the moving ring are stacked one on the other, and the screw shaft penetrates through the filter body formed therein. Concentration by gravity and sludge are fully dehydrated by the internal pressure formed by the back pressure plate during the advancing process. The filtrate is discharged from the filter joint formed by the fixed ring and the movable ring, and the mud cake is discharged from the end of the dehydration section. Advantages: Self-cleaning, non-blocking, direct dewatering of low-concentration sludge; slow speed, power saving, no noise and vibration; automatic control can be achieved, 24 hours without operation disadvantages: not good at large particles, large hardness The dewatering of the mud; the amount of treatment is small.

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