Electroplating wastewater treatment equipment What is the process?
Process of electroplating wastewater treatment equipment: coagulation method spraying wastewater coagulation method is one of the chemical treatment methods of spraying wastewater. By adding coagulant to the spraying sewage, the colloidal particles are coagulated, flocculated and separated to purify the sewage. Coagulation is the combination of coagulation and flocculation. The former is due to the addition of electrolyte to reduce or eliminate the electromotive force of colloidal particles, which leads to the loss of stability of colloidal particles and mutual polymerization of colloidal particles; The latter is generated by the adsorption and bridging of polymer substances, which enables colloidal particles to polymerize with each other.
Coagulants can be classified into two categories: ① Inorganic salts, including aluminum salt (aluminum sulfate, aluminum potassium sulfate, potassium aluminate, etc.), iron salt (ferric chloride, ferrous sulfate, ferric sulfate, etc.), magnesium carbonate, etc.; ② High molecular substances, including polyaluminum chloride, polyacrylamide, etc. In the process of treatment, coagulants are added to the spraying sewage to eliminate or reduce mutual exclusion between colloidal particles in the water, so that colloidal particles in the water are easy to collide and polymerize, forming larger particles or flocculants, and then separated from the water. Factors affecting water temperature include: water temperature, pH value, turbidity, hardness, coagulant dosage, etc.
The spraying sewage comes from the processes of degreasing and phosphating the surface before painting, and contains emulsified oil, surfactant, phosphate, heavy metal ion filler, solvent, etc. Electrophoretic coating sewage is generated from the cleaning process of floating paint and bath solution attached to the coated parts, generally including deionized washing water and ultrafiltration fluid; Its composition is the same as that of tank liquid, including water-soluble resin (such as epoxy resin, phenolic resin, etc.), pigment (such as carbon black, iron oxide red, lead mercury, etc.), filler (such as titanium bai powder, talcum powder, etc.), cosolvent (such as triethanolamine, butanol, etc.) and a small amount of heavy metal ions. The coagulation treatment method can make the colloidal particles in the coating sewage coagulate and separate, so as to achieve the effect of coating sewage treatment.
Coagulation reaction process coating sewage treatment device generally includes sewage storage tank, pretreatment tank, raw water storage tank, reaction sedimentation tank, reaction air flotation tank, clean water tank, and several sewage storage tanks are respectively equipped with pre-treatment tanks connected to COD online controller by pipes. Pretreatment tank is composed of demulsification area, and PH is composed of conditioning area and concrete area. The outlet pipe of pretreatment tank is connected to raw water storage tank, reaction sedimentation tank, reaction air flotation tank and clean water tank in turn. Each tank in the device is connected to the industrial computer evenly, and the pretreatment tank of COD online controller is set to dynamically mix various sewage in advance, adjust the coagulation sedimentation reaction COD in sewage, ensure the stability of water quality and improve the treatment efficiency.
