The problem of high moisture content of the pressed sludge and soft sludge may be caused by a variety of factors. The following is a detailed analysis of the problem and possible solutions:
1. Cause Analysis
Sludge properties:
The sludge contains more colloidal substances, impurities or hydrophilic groups, resulting in larger viscosity of the sludge, which is not easy to be completely filtered.
Impurities such as metal ions, sulfides, oxides in the sludge may also increase the moisture content of the sludge.
Improper selection of sludge conditioner:
The type of conditioner does not match the properties of the sludge, resulting in poor conditioning effect.
The amount of conditioner is insufficient or excessive, failing to achieve the desired conditioning effect.
Equipment problem:
The internal structure of the filter press is damaged or blocked, resulting in the normal filtration of the sludge.
The filter plate of the filter press is rusted or damaged, affecting the filtering effect.
The pressing force of the filter press is insufficient or the running time is too long, resulting in a reduction in the filtration effect and dehydration effect.
Improper operation:
Insufficient sludge pretreatment, such as no dehydration, drying and other steps.
The filtration process is not carried out in accordance with the operating procedures, such as no pre-discharge liquid.
Environmental factors:
Temperature, humidity and other environmental conditions are not suitable, affecting the dewatering effect of sludge.
Two, solution
Optimize sludge conditioning:
Select the appropriate sludge conditioner according to the sludge properties.
Adjust the amount of conditioner to ensure the best conditioning results.
When mixing sludge and conditioner, it is necessary to ensure that the mixture is uniform and avoid local unmixing.
Check and maintain equipment:
Check the internal structure of the filter press regularly to ensure that it is intact.
Clean and replace damaged or blocked filter plates.
Ensure that the pressing force of the filter press is moderate and avoid being too tight or too loose.
Control the running time of the filter press to avoid the efficiency reduction caused by continuous working for too long.
Standard operation process:
Sludge pretreatment and press filtration operation in strict accordance with the operating procedures.
Pre-discharge liquid before filtration to avoid sludge imbalance resulting in long filtration.
Improve environmental conditions:
Adjust the ambient temperature and humidity of the filtration operation to make it suitable for the dehydration of the sludge.
Other measures:
Consider adding an appropriate amount of auxiliary agents, such as flocculants, filter AIDS, etc., to improve the dewatering performance of the sludge.
Adopt more advanced sludge dewatering technology and equipment, such as high pressure pressing, vacuum dewatering, etc.
To sum up, in view of the high moisture content of the pressed sludge and the soft sludge, it is necessary to conduct comprehensive analysis and treatment from many aspects, such as sludge properties, sludge conditioner selection, equipment maintenance, operation process and environmental conditions. By taking a series of effective measures, the moisture content of sludge can be significantly reduced and the hardness of sludge can be increased.