Spraying paint wastewater treatment technology

A waste water treatment and waste water technology, applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of low cost of painting waste water, save business expenses and facilitate promotion effect of use

Active Publication Date: 2014-04-09
HUNAN ELECTRONICS WASTE PROCESSING CENT
View PDF5 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a treatment process for spray paint wastewater to solve the technical problem in the prior art that the paint spray wastewater cannot be treated at low cost until it reaches the standard discharge

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Spraying paint wastewater treatment technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1. Dilute 1 ton of spray paint wastewater (COD Cr The concentration is 22630mg / L, pH=7) placed in the pH adjustment pool, add concentrated sulfuric acid, stir evenly, the pH value of the wastewater is 2, let it stand for 5 minutes, the oil-in-water system begins to disperse and destabilize, and the oil and water slowly separate to obtain acidification liquid;

[0042] 2. Pour the obtained acidified solution into the demulsification sedimentation tank, add 0.1g of tertiary amine cationic polyether reverse demulsifier, 2g of calcium chloride, and 1g of 5‰PAM in sequence for each liter of acidified solution, stir quickly and evenly, and let it stand After 20 minutes, the upper suspension was scraped off, separated and collected to obtain a broken emulsion. At this time, the broken emulsion COD Cr The concentration is 13790mg / L, pH=2.

[0043] 3. Add 1.5kg of sodium hydroxide to each ton of broken emulsion, stir evenly, and measure COD after standing for 5 minutes Cr The...

Embodiment 2

[0051] 1. Dilute 1 ton of spray paint wastewater (COD Cr The concentration is 22630mg / L, pH=7) placed in the pH adjustment pool, add concentrated sulfuric acid, stir evenly, the pH value of the wastewater is 3, let it stand for 5 minutes, the oil-in-water system begins to disperse and destabilize, the oil and water slowly separate, and the acidified solution is obtained ;

[0052] 2. Pour the obtained acidified solution into the demulsification sedimentation tank, add 5g of tertiary amine cationic polyether reverse phase demulsifier, 0.01g of calcium chloride, 5g of PAM with a concentration of 5g / L to each liter of the acidified solution, and stir quickly and evenly , after standing for 20 minutes, scrape off the oil in the upper suspension, separate and collect, and obtain a broken emulsion. At this time, the broken emulsion COD Cr The concentration is 13790mg / L, pH=3.

[0053] 3. Add 1.2kg of sodium hydroxide to each ton of broken emulsion, stir evenly, and measure COD aft...

Embodiment 3

[0061] 1. Dilute 1 ton of spray paint wastewater (COD Cr The concentration is 22630mg / L, pH=7) placed in the pH adjustment tank, add concentrated sulfuric acid, stir evenly, the pH value of the wastewater is 4, let it stand for 5 minutes, the oil-in-water system begins to disperse and destabilize, and the oil and water slowly separate to obtain acidified liquid ;

[0062] 2. Pour the obtained acidification solution into the demulsification sedimentation tank, add 2g of tertiary amine cationic polyether reverse phase demulsifier, 10g of calcium chloride, 5g of PAM with a concentration of 2g / L to each liter of acidification solution, and stir quickly and evenly. After standing still for 20 minutes, scrape off the oil in the upper suspension, separate and collect, and obtain a broken emulsion. At this time, the broken emulsion COD Cr The concentration is 13790mg / L, pH=4.

[0063] 3. Add 1.0kg of sodium hydroxide to each ton of broken emulsion, stir evenly, and measure COD after...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a spraying paint wastewater treatment technology, comprising the following steps: adjusting the pH value of the wastewater to below 4 to obtain an acidizing fluid; demulsifying the acidizing fluid to obtain a demulsified solution; carrying out biodegradation on the demulsified solution; adding tertiary amine cationic polyether to the acidizing fluid as a reverse demulsifier, so that the CODCr of the wastewater is less than 30000mg / L. The CODCr value of the wastewater processed by the method is reduced to below 300mg / L from 10000-25000mg / L, and achieves the GB8978-1996 three-level standard, and the required cost of the overall craft process is 20-100 yuan in per ton of wastewater.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a treatment process for spray paint wastewater. Background technique [0002] The spraying wastewater mainly comes from the wet spray booth washing the air in the spray booth working area with water, and the paint and organic solvents in the air are transferred to the water to form the spray painting wastewater. Paint spray wastewater contains a large amount of suspended solids such as resins, surfactants, organic solvents (such as ethanol, acetone, lipids, benzene) and additives, and refractory macromolecular organic substances. The composition of pollutants is relatively complex, and COD Cr (Chemical oxygen demand measured with potassium dichromate as an oxidant) has a high concentration and poor biodegradability. At present, the traditional methods of treating spray paint wastewater are dilution method and coagulation method. [0003] The dilution method is to mix it with...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C02F9/14
Inventor 明果英黄山多张海静黄兴
Owner HUNAN ELECTRONICS WASTE PROCESSING CENT
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap