Treatment and reuse system and method for up-to-standard discharged painting wastewater

Abstract

The invention provides a treatment and reuse system and and method for up-to-standard discharged painting wastewater. A first treatment part, an activated carbon filtering device or a resin adsorptionCODcr device, an ultrafiltration device, an ultrafiltered water tank, a softening device and a first reverse osmosis device in the treatment and reuse system for the up-to-standard discharged painting wastewater are in fluid communication in sequence; an ion exchange device, a constant-pressure water supply device, a sterilization device and a filtering device are in fluid communication in sequence; penetrating fluid outlets of the first reverse osmosis device, a second reverse osmosis device and a third reverse osmosis device separately communicate with the ion exchange device; and a residual seepage liquid outlet of the first reverse osmosis device communicates with the second reverse osmosis device, and a residual seepage liquid outlet of the second reverse osmosis device communicateswith the third reverse osmosis device. According to the invention, the wastewater which is discharged after reaching the standard is deeply treated and is reused in a paint workshop as dilution waterfor a vehicle body surface treating agent in the paint workshop and pure water for a painting production line, so the wastewater can be recycled and prevented from polluting the environment.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and relates to a treatment and reuse system and a treatment and reuse method for discharging waste water up to the painting standard. Background technique [0002] The discharge wastewater that meets the painting standard is the environmental protection comprehensive discharge of the paint wastewater generated by the painting production workshop of the automobile factory after the physical, chemical, biochemical, and sedimentation treatment at the wastewater station. , CODCr: 150~200mg / L, TDS: 1480~2200mg / L, conductivity: 1700~2500us / cm, HCO3 - : 500~550mg / L, PO4 3- : 8~15mg / L, SO4 2- : 500~600mg / L, NO3 - : 25~35mg / L, Cl - : 15~25mg / L, F - :8~15,K + (Element): 138~150mg / L, Na + (element): 370~400mg / L, S (element): 220~250mg / L, P (element): 4~8mg / L, B (element): 15~20mg / L, Ca (element): 25~ 35mg / L. Because the wastewater contains a certain amount of organic matter, has poor biodegrada...

AI Technical Summary

Problems solved by technology

Because the wastewater contains a certain amount of organic matter, has poor biodegradability, and contains a certain amount of salt and hardness, it is difficult to reuse and treat it, especially when the quality of the reused water is very high, it will greatly increase the difficulty of treatment.

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