Spray paint wastewater treatment method

Abstract

The invention relates to the field of wastewater treatment, in particular to a spray paint wastewater treatment method. The method comprises steps as follows: 1), wastewater passes through a grating to remove suspended matter, and a first treated solution is obtained after standing aeration; 2), a pH regulator is added to the first treated solution to regulate pH value, and a second treated solution is obtained; 3), a soluble superphosphate is added to the second treated solution, a first stirring reaction is performed, and a third treated solution is obtained; 4), a ferrous salt solution is added to the third treated solution, a second stirring reaction is performed, and a fourth treated solution is obtained; 5), a coagulant is added to the fourth treated solution for third stirring, a flocculant is added, fourth stirring is performed, and a mixed solution is left to stand for layering; 6), the upper suspended matter is removed after stand layering in step 5), and a subnatant is to bedischarged or recycled. With the adoption of the treatment method, the treatment effect of spray paint wastewater is good, viscosity breaking efficiency of the wastewater is high, the wastewater canbe effectively improved, and the CODCr value of the spray paint wastewater is smaller than 100 mg / L and reaches the three-level standard GB8978-1996.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a method for treating paint spraying wastewater. Background technique [0002] The spraying wastewater mainly comes from the water in the wet spraying room or the process of painting the workpiece. Paint spraying wastewater contains a large amount of suspended solids such as resins, surfactants, organic solvents and additives, as well as difficult biodegradable macromolecular organics. The composition of pollutants is relatively complex and the recyclability is poor. At present, the traditional methods of treating paint spraying wastewater are dilution method and coagulation method. However, because the volume of the wastewater to be treated after dilution is too large, a large amount of chemicals need to be added, so the treatment cost is high, and it is not suitable for large-scale application. The coagulation method is to directly add coagulants and flocculants to the spra...

AI Technical Summary

Problems solved by technology

Paint spray wastewater contains a large amount of suspended solids such as resins, surfactants, organic solvents and additives, and macromolecular organic substances that are difficult to biodegrade. The composition of pollutants is relatively complex and the recyclability is poor.

At present, the traditional methods of treating spray painting wastewater are dilution method and coagulation method, but because the volume of wastewater to be treated after dilution is too large, a large amount of chemicals need to be added, so the treatment cost is high, and it is not suitable for large-scale application

The coagulation method is to directly add coagulant and flocculant to the spray paint wastewater for coagulation treatment, but the quality of the effluent water is difficult to meet the safety discharge standard. The present invention solves the existing problems by configuring a method that can eliminate the viscosity of water-soluble and fat-soluble paints and has a good A spray paint wastewater treatment agent with good coagulation effect, a treatment method that reduces the cost of the agent, can effectively improve the wastewater, and make the effluent quality meet the standard