Tannery sludge dewatering

Tannery sludge dewatering is an important step in the leather manufacturing process. The purpose is to reduce the volume and water content of the sludge for easy transportation and subsequent treatment. Here are some key information about tannery sludge dewatering: Characteristics of tannery sludge - High water content: usually between 75% and 85%. - Complex composition: contains organic matter, protein, grease, hair residues and various chemical raw materials in the leather processing process. - Highly polluting: contains harmful substances such as heavy metals, organic solvents, etc. Dewatering methods 1. Mechanical dewatering: - Belt filter press: suitable for dewatering tannery sludge, pressurizing the sludge through the filter cloth to achieve water separation. - Plate and frame filter press: presses the sludge by hydraulic or mechanical means, suitable for dewatering viscous sludge. - Centrifugal separator: uses centrifugal force to separate solids and liquids, suitable for sludge with finer particles. 2. Thermal drying dewatering: - By heating the sludge, its water evaporates to achieve volume reduction. Energy consumption and operating costs need to be considered. 3. Chemical dehydration: - Use chemical agents such as flocculants to change the physical properties of sludge and promote the separation of water. - Attention should be paid to the selection and dosage of agents to avoid secondary pollution to the environment. Selection of dehydration equipment - Select appropriate dehydration equipment according to the characteristics of sludge and treatment requirements. - Consider the equipment's processing capacity, dehydration efficiency, operating costs and environmental performance. Environmental protection and treatment - Dehydrated sludge needs further treatment, such as landfill, composting, incineration, etc. - Pay attention to environmental protection requirements during sludge treatment to ensure that relevant environmental regulations are not violated. Management and maintenance - Regularly inspect and maintain dehydration equipment to ensure its normal operation. - Train operators to ensure the standardization and safety of operations. By comprehensively considering the characteristics of sludge, treatment requirements and environmental protection requirements, selecting appropriate tannery sludge dehydration technology and equipment can effectively reduce the volume and water content of sludge, reduce treatment costs, and meet environmental protection requirements.