For the plate and frame filter press mud dewatering difficult, mud cake thin and high moisture content of the problem, the following are some possible reasons and corresponding solutions:
Cause analysis
Sludge properties:
Sludge contains a large number of colloidal substances (such as proteins, polysaccharides, etc.) and microbial cells, these substances have strong water absorption and water retention, making the water between the sludge particles difficult to remove.
The viscosity of the sludge is large, and it is easy to block the filter cloth or filter screen, affecting the dehydration effect.
Equipment operation problem:
The parameter setting of the dehydration equipment is unreasonable, such as pressure, speed, etc., resulting in poor dehydration effect.
Clogging of filter cloth or filter screen prevents the passage of water and reduces the efficiency of dehydration.
Improper chemical conditioning:
The type or dosage of sludge conditioner used is not appropriate, which can not effectively destroy the colloidal structure of the sludge and reduce the viscosity of the sludge.
Solution
Improve sludge properties:
Adopt biological conditioning or chemical conditioning methods, such as adding chemical agents to destroy the colloidal structure of the sludge and reduce the viscosity and moisture content of the sludge.
Optimize the wastewater treatment process, reduce the content of organic matter in the sludge, thereby reducing the amount of odor gas production, and improve the dewatering performance of the sludge.
Optimize equipment operation:
According to the nature of the sludge and the actual operation situation, reasonably adjust the pressure, speed and other parameters of the dewatering equipment to ensure that the equipment runs in the best condition.
Periodically test and evaluate the performance of the equipment, and replace the damaged parts in time to ensure the normal operation of the equipment.
Develop a strict equipment cleaning plan, regularly clean the filter cloth or filter screen of the dehydration equipment, remove the blockage, and maintain the permeability of the filter cloth.
Adjust chemical conditioning program:
According to the nature of sludge and treatment requirements, choose the appropriate type and dosage of sludge conditioner.
Determine the best dosing plan through experiments to avoid excessive or insufficient dehydration effect.
Pay attention to the dissolution and mixing uniformity of the sludge conditioner to ensure that it is fully in contact with the sludge and plays a role.
Other measures:
Before sludge drying, first carry out effective mechanical dehydration pretreatment, such as the use of high-pressure filter press, centrifugal dehydrator and other equipment, as far as possible to reduce the initial water content of the sludge.
Consider the use of high pressure plate frame filter press or automatic high pressure plate frame filter press for dehydration treatment to improve dehydration efficiency and reduce water content.
In summary, in view of the problems of difficult mud dewatering, thin mud cake and high moisture content of plate and frame filter press, comprehensive analysis and treatment need to be carried out from many aspects such as sludge properties, equipment operation and chemical conditioning. By taking the above measures, the dewatering efficiency can be effectively increased, the moisture content can be reduced and the quality of mud cake can be improved.