IMunicipal sludge is the product of municipal sewage treatment, its organic matter and water content is high, usually more than 80%, and even can reach 95%, which is also the main reason for the difficulty of municipal sludge dehydration. In order to solve the difficult problem of municipal sludge dewatering, it is necessary to take a series of measures, including improving the physical and chemical properties of sludge, selecting the appropriate dewatering equipment and process, and improving the efficiency of dewatering.

IFirst of all, in order to improve the physical properties of the sludge, it is necessary to carry out conditioning treatment. The commonly used tempering methods include chemical tempering and thermal drying tempering. Chemical conditioning is to add chemical agents to the sludge, such as polyaluminum chloride (PAC), polyacrylamide (PAM), new sludge conditioner, etc., to improve the physical properties of the sludge and improve its dewatering performance. Hot drying conditioning is to heat the sludge, so that the water in it evaporates, while improving the physical properties of the sludge, improve its dehydration performance.

ISecondly, in order to choose the right dehydration equipment and process, it is necessary to choose according to the actual situation. The commonly used sludge dewatering equipment includes plate and frame filter press, belt filter press, centrifuge, screw stacking machine and so on. Among them, the belt filter press is suitable for various types of sludge, but the dehydration efficiency is relatively low; Centrifuges have higher dehydration efficiency, but higher operating costs; The folding machine has the advantages of high efficiency, energy saving and easy operation, but it is easy to jam and other problems. The plate and frame filter press includes box type plate and frame, high pressure diaphragm plate and frame, etc., which has high dehydration rate and large mud production, and is an ideal dewatering equipment choice. Therefore, when choosing dehydration equipment and processes, it is necessary to consider the actual situation and economic benefits.

IFinally, in order to improve the dehydration efficiency, it is necessary to optimize the dehydration process parameters. Commonly used dewatering process parameters include pressure, temperature, speed and so on. When selecting the right pressure and temperature, it is necessary to consider the nature of the sludge and the performance of the equipment. At the same time, it is also necessary to adjust the speed according to the actual situation to avoid excessive mechanical damage to the sludge.

IThe use of the new sludge conditioner combined with the plate and frame filter press can reduce the municipal sludge with 95% moisture content to 60%, effectively improve the sludge pressing efficiency, and save operating costs.