In view of the problem of high water content of sludge and the optimization of the mud press effect of plate and frame filter press, the following are some specific suggestions and measures:
Solve the problem of high water content of sludge
Centrifugal dehydration:
The centrifugal force generated by the high-speed rotation of the centrifuge is used to separate the water in the sludge.
Centrifugal dehydration can rapidly reduce the moisture content of the sludge, usually reducing the sludge moisture content to less than 80%.
Press dehydration:
includes plate and frame filter press and belt filter press.
Through the pressure, the water in the sludge is squeezed out to form a dry filter cake.
Add chemical conditioner:
Such as flocculants (such as polyacrylamide PAM), coagulants, etc., can improve the dewatering performance of sludge.
These conditioners through the role of electrical neutralization, adsorption and bridging, so that the sludge particles gathered into a group, easy to dehydrate.
Natural drying:
The sludge is spread out in a sunny and well-ventilated place, and the moisture in the sludge is gradually reduced by natural evaporation.
However, this method covers a large area and is limited by weather conditions.Hot air drying and solar drying:
Use high temperature hot air or solar energy to evaporate the water in the sludge.
Hot air drying can quickly reduce the moisture content of sludge, but the energy consumption is high; Solar energy is dry, environmentally friendly and economical, but is also subject to weather conditions and requires a larger footprint.
Biological treatment:
Anaerobic digestion: under anaerobic conditions, organic matter in the sludge is degraded through the action of microorganisms, and energy such as biogas is produced.
Aerobic digestion: Under aerobic conditions, the sludge oxidizes itself through microbial respiration, reduces the content of organic matter, and improves the stability of the sludge.
Optimize the effect of plate and frame filter press
Select the right sludge conditioner:
When the sludge is not added with conditioner, large flocculants will be formed, especially biochemical sludge, which is easy to block the pores of the filter cloth, resulting in high water content.
Adding suitable sludge conditioner, such as polyacrylamide (PAM), can destroy the hydrophilic groups on the surface of the sludge, release water, and improve the dehydration efficiency.
Optimize the dosage and method of conditioner:
According to the specific nature and composition of sludge, choose the appropriate type and dosage of conditioner.
Through the on-site debugging of technical personnel, determine the best addition amount and method to ensure that the sludge and the sludge conditioner are fully mixed.
Increase sludge solid content before filtration:
The sludge with low solid content has high water content, which affects the filtration efficiency.
Appropriate increase of solid content is helpful to reduce the water content of the extruded sludge.
Optimize the filtration process:
The method of pre-pressing and step-up pressure can effectively improve the sludge dewatering effect.
Reasonable arrangement of filter cloth and filter plate, as well as regular cleaning and replacement of filter cloth, can help improve the operating efficiency of plate and frame filter press.
Adjust filter press parameters:
According to the nature of sludge and treatment requirements, adjust the pressure, time and temperature of the filter press to achieve the best dewatering effect.
In summary, to solve the problem of high water content of sludge and optimize the mud press effect of plate and frame filter press, a variety of methods and technical means need to be comprehensively considered. In practical applications, appropriate treatment methods or combinations of treatment methods can be selected according to the specific properties of sludge, treatment costs, environmental requirements and other factors.