CN102633381A

CN102633381A - Water paint production wastewater retreatment method

Info

Publication number: CN102633381A
Application number: CN2012101003671A
Authority: CN
Inventors: 朱豪
Original assignee: JIANGSU SAISHANG LOW CARBON TECHNOLOGY Co Ltd
Current assignee: JIANGSU SAISHANG LOW CARBON TECHNOLOGY Co Ltd
Priority date: 2012-04-06
Filing date: 2012-04-06
Publication date: 2012-08-15

Abstract

The invention relates to the technical field of water paint wastewater treatment, in particular to a water paint production wastewater retreatment method. The method includes: step one, adding wastewater into a wastewater settling tank, adding polyaluminium chloride which is 0.1-0.3%. of the wastewater in weight, and starting an air pump for blowing and mixing for 20-40 minutes; and step two, after floating particulate matters in the wastewater are stable, slowly adding polyacrylamide solution with the weight being 0.25-0.75% of that of the wastewater and the concentration being 0.5-1.5%. to enable the floating particulate matters in the wastewater to be completely flocculated and the water to be clear. The wastewater is subjected to chemical flocculating settling, mechanical filtering and disinfection and then reused for production after water quality is qualified, the separated sludge can be subjected to drying and grinding and then used for production of construction putty powder, and accordingly 'zero emission' in production of water paint is realized, loss of raw materials and additives is reduced while discharge of wastewater and waste residue is avoided, and sewage-free, harmless and environment-friendly production process is realized.

Description

Water-borne coatings factory effluent Retreatment method

Technical field

The present invention relates to the water-borne coatings technical field of waste water processing, is a kind of water-borne coatings factory effluent Retreatment method.

Background technology

Traditional water-borne coatings production technique, wastewater flow rate is bigger, and general manufacturing enterprise all adopts the mode of end treatment to handle, and not only contaminate environment, broken ring are ecological, and waste resource in a large number, have seriously restricted the development of China's economy with society.

Summary of the invention

The invention provides a kind of water-borne coatings factory effluent Retreatment method, overcome the deficiency of above-mentioned prior art, it can solve the problem of the wastewater treatment difficulty of water-borne coatings.

Technical scheme of the present invention realizes like this: a kind of water-borne coatings factory effluent Retreatment method; The first step: in the settlement of sewage groove, add sewage; The Poly aluminum Chloride (PAC) that adds sewage weight 0.1～0.3 ‰ is then opened the pneumatic pump air blowing and was stirred 20 minutes to 40 minutes; Second step: after treating in the sewage that the floating particle thing is stable, slowly add weight again and be sewage weight 0.25～0.75% and concentration is 0.5～1.5 ‰ polyacrylamide solution, make that floating particle fully flocculates in the sewage, water body is as clear as crystal; The 3rd step: leave standstill deposit 12 hours after, supernatant in the sewage is filtered through charcoal filter, just the water after the filter is collected in the PP storage tank, carries out essence through RO reverse osmosis membrane pure water system and filters; The 4th step: the softening water after the smart filter is used as water-borne coatings water of productive use, treated softening water, COD≤5mg/L, specific conductivity≤5 μ s/cm through ozone sterilization again after 10 minutes.

The separated mud of above settlement of sewage groove after centrifuge dewatering to water port does not have fluid basically, after the oven dry of vacuum bipyramid rotary dryer, again through ball mill grinding to 100～200 order fineness powders, drops into the production of exterior-wall heat insulation putty powder with the gained slag charge.

Waste water is behind chemical flocculation sedimentation, mechanical filter, sterilization and disinfection among the present invention; Again be back to production after water quality is qualified, separated mud can continue after drying, grinding, to be used for building putty powder production, thereby realizes water-borne coatings production " zero release "; Like this; Both reduce the loss of starting material, auxiliary agent, stopped the discharging of waste water, waste residue again, realized no dirt, innoxious environment-friendly production process.

Description of drawings

Fig. 1 is a schema of the present invention.

Embodiment

As shown in Figure 1, a kind of water-borne coatings factory effluent Retreatment method, the first step: in the settlement of sewage groove, add sewage, add the Poly aluminum Chloride (PAC) of sewage weight 0.1～0.3 ‰ then, open the pneumatic pump air blowing and stirred 20 minutes to 40 minutes; Second step: after treating in the sewage that the floating particle thing is stable, slowly add weight again and be sewage weight 0.25～0.75% and concentration is 0.5～1.5 ‰ polyacrylamide solution, make that floating particle fully flocculates in the sewage, water body is as clear as crystal; The 3rd step: leave standstill deposit 12 hours after, supernatant in the sewage is filtered through charcoal filter, just the water after the filter is collected in the PP storage tank, carries out essence through RO reverse osmosis membrane pure water system and filters; The 4th step: the softening water after the smart filter is used as water-borne coatings water of productive use, treated softening water, COD≤5mg/L, specific conductivity≤5 μ s/cm through ozone sterilization again after 10 minutes.Isolating mud can send the chemical waste disposal processed in units of qualification after dehydration.RO reverse osmosis membrane pure water system is existing technique known equipment.

As shown in Figure 1, as required, the separated mud of settlement of sewage groove; After centrifuge dewatering to water port does not have fluid basically; The gained slag charge after the oven dry of vacuum bipyramid rotary dryer, again through ball mill grinding to 100～200 order fineness powders, is dropped into the production of exterior-wall heat insulation putty powder.

Claims

1. a water-borne coatings factory effluent Retreatment method is characterized in that: the first step: in the settlement of sewage groove, add sewage, add the Poly aluminum Chloride (PAC) of sewage weight 0.1～0.3 ‰ then, open the pneumatic pump air blowing and stirred 20 minutes to 40 minutes; Second step: after treating in the sewage that the floating particle thing is stable, slowly add weight again and be sewage weight 0.25～0.75% and concentration is 0.5～1.5 ‰ polyacrylamide solution, make that floating particle fully flocculates in the sewage, water body is as clear as crystal; The 3rd step: leave standstill deposit 12 hours after, supernatant in the sewage is filtered through charcoal filter, just the water after the filter is collected in the PP storage tank, carries out essence through RO reverse osmosis membrane pure water system and filters; The 4th step: the softening water after the smart filter is used as water-borne coatings water of productive use, treated softening water, COD≤5mg/L, specific conductivity≤5 μ s/cm through ozone sterilization again after 10 minutes.

2. water-borne coatings factory effluent Retreatment method according to claim 1; It is characterized in that: the separated mud of settlement of sewage groove; After centrifuge dewatering to water port does not have fluid basically; The gained slag charge after the oven dry of vacuum bipyramid rotary dryer, again through ball mill grinding to 100～200 order fineness powders, is dropped into the production of exterior-wall heat insulation putty powder.