Sludge generated by sewage treatment has a high water content. Due to the combination of water and sludge particles, mechanical removal has certain limitations. The content of organic matter and ash content in sludge, especially the addition of flocculant, have an important impact on the final solids content. Next I will introduce some common methods of sludge dewatering.
Natural drying can be divided into two kinds: Sand drying plant and drying plant. The former is used for dewatering the sediment in the sedimentation tank. The latter is used for the dehydration of primary sedimentation sludge, humus sludge, digestion sludge, chemical sludge and mixed sludge.
Sludge concentration is the most economical and effective way to reduce the volume of sludge, no matter how sludge treatment, sludge concentration is essential. At present, the most commonly used methods for sludge concentration include gravity concentration, air floatation concentration, centrifugal concentration and hydrocyclone concentration.
Mechanical dehydration is a common method in the world. The commonly used dehydration machinery includes vacuum filter, plate and frame filter press, belt filter press and centrifuge, etc. In recent years, the rotary centrifuge and the belt filter press have developed rapidly.
Belt filter press
The main feature of the belt filter press is that it uses the tension and pressure of the press cloth to apply pressure to the sludge on the press cloth to dehydrate the sludge, which does not need vacuum or pressure equipment, has low power consumption and can be operated continuously. Its operation is only determined by the speed and capacity of the filter cloth. Even if the load changes during operation, it can stabilize dehydration and has a simple structure. No noise and vibration, easy to achieve airtight operation. Belt filter press is suitable for dewatering of activated sludge and organic hydrophilic sludge.
Centrifugal dewatering mainly uses centrifugal force instead of gravity or pressure as driving force to dewatering sludge. Generally independent system, running without too much monitoring, good dryness; But need special maintenance, generally not suitable for intermittent operation; Suitable for continuous operation of large and medium-sized sewage plant solid treatment.
Sludge drying belongs to the heat treatment process, is through heating the sludge, evaporation of water in the sludge, make it completely dry. This process covers a small area, the sludge reduction effect is obvious, and because the treatment process is carried out in closed equipment, the impact on the environment is relatively small, but this process is relatively high investment.
Dingli Company operated a series of technical researches on currently market situation of sludge treatment and the characteristics of sludge in various regions, concentrating created a new generation of sludge belt dewatering machine, the technology of equipment gets absolutely mature enough, also it has stable capacity of operation and very convenient to operate and maintain. If you want to know more case about belt dewatering machine, please Contact Us at any time, Our online customer service is always at your service.
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