Polyaluminum chloride (PAC) is a commonly used coagulant, widely used in the treatment of printing and dyeing wastewater. The main goal of treating printing and dyeing wastewater is to remove suspended solids, chromaticity, organic matter, and other pollutants to meet discharge standards. The following are the general steps for using PAC to treat printing and dyeing wastewater:
Preliminary investigation: Before selecting an appropriate PAC treatment plan, a preliminary investigation is necessary to understand the water quality characteristics, pollutant types, and concentration distribution of printing and dyeing wastewater. This helps to determine the correct PAC type, dosage, and treatment method.
Selection of PAC: Based on the preliminary investigation results, select PAC with appropriate basic degree and aluminum hydroxide content. The selection of basic degree usually depends on the properties of printing and dyeing wastewater, while the selection of aluminum hydroxide content depends on the required coagulation effect.
Control the dosage: Determine the appropriate amount of PAC dosage to ensure maximum coagulation effect. The determination of dosage needs to consider the nature of wastewater, the characteristics of PAC, and the capacity of treatment equipment.
Coagulation process: PAC coagulates suspended solids and organic matter in wastewater into larger particles through the coagulation process, facilitating subsequent sedimentation or filtration treatment. The coagulation process may need to be carried out in a mixing tank or coagulation tank to ensure uniform dispersion of PAC in the wastewater.
Sedimentation or filtration: The particles generated from coagulated printing and dyeing wastewater can be separated through sedimentation or filtration. This can be achieved through sedimentation tanks or filtration equipment, depending on the treatment process and water quality requirements.
Post treatment: The treated water may require further treatment to meet discharge standards, such as neutralization, oxidation, disinfection, and other steps.
Monitoring and adjustment: Regularly monitor the treated water quality and adjust the treatment process based on the monitoring results to ensure that the wastewater treatment achieves the expected effect.
When using PAC to treat printing and dyeing wastewater, ensure the selection of appropriate PAC types and treatment plans, while ensuring compliance with local regulations and discharge standards.
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