Plate and frame filter press is widely used in the field of sludge dewatering, then what sludge dewatering agent or sludge filter aid should be used to press the sludge dry? works chemical Xiaobian here to share the following experience, in many cases, the use of improper agents will be sticky tape paste filter cloth or side leakage problems. Printing and dyeing sludge, after physical and chemical treatment, influent COD is 800, after treatment is 200-300, it is difficult to debug. In the treatment of various types of sewage, the sewage will contain solid substances.

For example, in the sewage of urban sewage plants, the solid substances contained are mainly colloidal particulate matter, which has a strong affinity with water. Dehydration can be very difficult if proper treatment measures are not taken. So what sludge dewatering agent should be used to press the sludge dry? At present, the sludge dehydrating agents on the market mainly include ferric chloride, polyferric sulfate, lime, polyaluminum chloride, polyacrylamide, and new sludge dehydrating agents. In the face of so many types of sludge dewatering agents, how should we choose? Next you Shi Jun Xiaobian simple talk about the role of several drugs.

We first talk about polyacrylamide, polyacrylamide in the sludge dehydration will produce large floc, but easy to stick to the filter cloth, the mud cake pressed out is thinner, the moisture content after the mud is generally about 75%-80%, the sludge dehydration is not complete, while the addition of high amount of agents. Next we talk about the new sludge dehydrating agent, sludge dehydrating agent is a characteristic polymer, as a drying agent in the sludge dewatering process, compared with the traditional PAM flocculant, can significantly reduce the sludge water content, all or part of the replacement of the sludge deep dewatering process used in the inorganic flocculating agent and conditioner, such as polyferric chloride, polyaluminum chloride, lime, etc. Achieve true sludge reduction, while maintaining sludge properties and organic matter content, without changing filtrate pH value and salt content.

After the use of sludge dewatering agent combined with the plate and frame filter press, the weight of the pressed sludge is obviously reduced, and the moisture content of the mud cake can be 40%-60%; At the same time, the mud press efficiency is increased by 100%-500%, which greatly shorens the mud press cycle, and also shorens the frequency of the filter cloth of the plate and frame filter press, saving the operating costs.

Sludge dewatering agent has the characteristics:

1. with the sludge, the formation of fine, strong small floc, greatly reduce the specific resistance of the sludge dehydration process.

2.it can achieve rapid and continuous dehydration of sludge, achieve solid-liquid separation, reduce the moisture content of sludge and the purpose of real reduction.

3. all or part of the replacement of inorganic flocculants will not increase the salt content of the filtrate and improve the operating conditions of the sewage treatment plant.

4. is conducive to reducing anaerobic reaction calcification and overflow site scaling. Nuoguan environmental technician after conditioning pressed out of the sludge.

5. with a strong dewatering, dodging combined with the use of plate and frame filter press, can reduce the sludge moisture content from more than 90% to 40%-60%, fully achieve sludge reduction.

6. do not use lime, reduce the use of inorganic salts, will not cause blockage filter cloth, extend its cleaning frequency and service life.