In view of the high moisture content of mud cake and the problem of "runny" (that is, the central part of the cake is loose, like a sweet heart), it can be solved from the following aspects:
1. Optimization of sludge treatment technology
Increase press pressure:
In the process of sludge dewatering, increasing the pressing pressure can significantly reduce the moisture content of mud cake. For example, the use of high-pressure dehydration technology such as diaphragm pressing can greatly reduce the water content of filter cake and increase the dryness of filter cake.
Sludge conditioning:
According to the characteristics of water quality, the sludge conditioning process is done well, and the sludge is pretreated to improve the sludge concentration and dehydration efficiency. Sludge enhancers or other conditioning agents can be added to improve the dewatering performance of the sludge.
2. Equipment Adjustment and maintenance
Equipment selection and maintenance:
Select dewatering equipment suitable for municipal sludge characteristics, such as plate and frame filter press, belt filter press, etc., and ensure stable equipment performance.
Maintain and maintain the dewatering equipment regularly, check the tightness of the equipment, the condition of the filter cloth, etc., and replace the damaged parts in time.
Adjust device parameters:
According to the sludge characteristics and treatment requirements, adjust the operation parameters of the equipment, such as pressing time, pressing speed, etc.
3. Operation and Management
Standard operation:
The filter press is used in strict accordance with the operating procedures to ensure that the compression force is sufficient to avoid the poor filtering effect caused by improper operation.
Strengthen monitoring:
Establish a monitoring system for sludge dewatering process, real-time monitoring of sludge moisture content, dehydration efficiency and other indicators.
Perform regular performance tests on the filter press to ensure that it is in the best working condition.
Iv. Follow-up Treatment and resource Utilization
Double press:
After the initial press, the filter cake can be pressed twice to further reduce the water content.
Resource utilization:
Explore ways to recycle sludge, such as using sludge for agricultural fertilizers, soil amendments or building materials.
Through the utilization of resources, the treatment cost can be reduced, and the reduction, harmfulness and resource of sludge can be achieved at the same time.
Case Study
Taking a sewage treatment plant as an example, the plant previously used a belt filter press to treat the sludge, and the moisture content was as high as 80%-85%, which did not meet the requirements of relevant departments. Later, the plant changed to a diaphragm filter press, and by increasing the press pressure, adding sludge adjuvants and other measures, successfully reduced the sludge moisture content to about 65%, to meet the requirements of the relevant departments. At the same time, the dehydrated sludge is also transported to the power plant to generate electricity, which realizes the resource utilization of the sludge.
In summary, to solve the problem of high water content of mud cake and "runny", it is necessary to start from many aspects, including optimizing the sludge treatment process, adjusting equipment parameters, standardizing operation and management, strengthening follow-up treatment and resource utilization. Through comprehensive policies, the water content of sludge after dehydration can be effectively reduced, and the treatment efficiency and resource utilization rate can be improved.