I. Problem Background
During the sludge dewatering process in papermaking, the phenomenon where the sludge adheres to the filter cloth and fails to form a proper shape during pressing is a common technical challenge. This issue not only reduces the dewatering efficiency but also increases the maintenance costs of the equipment, and even affects the subsequent resource utilization of the sludge. The main reasons for this include:
Sludge characteristics: The papermaking sludge contains a large amount of fine fibers and colloidal substances, with high viscosity and is prone to clogging the pores of the filter cloth.
Inappropriate drug matching: Traditional dehydration agents (such as PAM) may not be able to effectively break down the sludge's colloidal structure, resulting in poor dehydration performance.
Equipment operating parameters: The settings for parameters such as filter press pressure and sludge injection time are not reasonable, which may also exacerbate the problem.
II. Key Principles of Chemical Agent Matching
To address the issues of sticky filter cloth and unformed sludge pressing, the following principles should be followed for chemical agent matching:
Efficient sludge gel disruption: Select agents that can effectively break the sludge's colloidal structure and reduce its viscosity.
Promote flocculation: The agent should have excellent flocculation properties, helping the sludge to form dense and easy-to-dewater flocs.
Wide adaptability: The agent needs to be able to adapt to different sources and properties of papermaking sludge, ensuring stable performance.
III. Recommended Agent: Sludge Enhancer
The sludge enhancer is a highly effective agent specially developed to address the problem of sludge dewatering in papermaking. Its key advantages include:
Strong gel-breaking ability: Through a unique formula, it can quickly break the sludge's gel structure, significantly reducing its viscosity and preventing filter cloth clogging.
Filtration efficiency is excellent: The formed flocs are dense and resistant to shear. After dewatering, the sludge cake has a low moisture content and good formability.
Widely applicable: Suitable for all types of papermaking sludge, including highly viscous and highly organic sludge.
IV. Suggestions for Drug Administration
Optimization of Dosage:
The initial dosage is 0.1% - 0.3% of the dry weight of the sludge, and it can be adjusted according to the properties of the sludge.
Determine the optimal dosage through a small-scale test to avoid over-dosage or under-dosage.
Addition method:
It is recommended to uniformly add the reagent during the sludge conditioning stage to ensure that the reagent is fully mixed with the sludge.
Equipment compatibility:
Adjust the pressure of the filter press (recommend 0.6 - 1.0 MPa) and the sludge feeding time (optimize according to the nature of the sludge).
The problem of papermaking sludge adhering to the filter cloth and failing to form a proper shape during sludge pressing can be effectively solved by using an efficient sludge enhancer. By properly selecting the chemicals and optimizing the equipment, the dewatering efficiency can be significantly improved and the operating costs can be reduced.