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Method for treating printing-and-dyeing wastewater

A technology for printing and dyeing wastewater and treatment methods, which is applied in water/sewage treatment, biological water/sewage treatment, neutralized water/sewage treatment, etc. Economic and environmental benefits, avoidance of inhibition, effects of pollution mitigation

Inactive Publication Date: 2017-05-10
SICHUAN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These treatment methods have high treatment costs, unstable effects, and are difficult to meet the discharge standards stably.
Due to the addition of sulfuric acid in the biochemical method, a large amount of H is produced in the process of anaerobic or hydrolytic acidification 2 S, causing serious secondary pollution, in addition, due to a large amount of SO 4 2- The existence of inhibiting the growth of microorganisms seriously affects the effect of wastewater biochemical treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Example 1: Treat 1m per day 3 Printing and dyeing wastewater (pH10.7, COD Cr 5700mg / L, BOD 5 1200mg / L, chroma 330, aniline 25mg / L, T-N99mg / L), after CO 2 Adjust pH (6.5), aluminum powder reduction (add 5g of aluminum powder per liter of wastewater, 3h, 25°C, CO 2 Pressure 0.1MPa), hydrolytic acidification (4h), aerobic biochemical (4h) and activated carbon biological filter tower (hydraulic load is 100m 3 / m 2 .d. The total thickness of activated carbon is 1m), and the effluent quality is COD Cr 77mg / L, BOD 5 13mg / L, chromaticity 8, T-N 13mg / L, no aniline detected.

Embodiment 2

[0008] Embodiment 2: 60m is processed every day 3 Printing and dyeing wastewater (pH10.5, COD Cr 6100mg / L, BOD 5 1200mg / L, chroma 370, aniline 27mg / L, T-N 105mg / L), CO 2 Adjust pH (6.8), aluminum powder reduction (add 10g of aluminum powder per liter of wastewater, 1h, 40°C, CO 2 Pressure 0.3MPa), hydrolytic acidification (6h), aerobic biochemical (6h) and porous ceramsite biological filter tower (hydraulic load is 150m 3 / m 2 .d. The total thickness of porous ceramsite is 2m), and the effluent quality is COD Cr 65mg / L, BOD 5 10mg / L, chroma 8, T-N 16mg / L, no aniline detected.

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Abstract

The invention discloses a method for treating printing-and-dyeing wastewater. The method includes treatment processes of CO2 neutralization, pressurized aluminium powder reduction, hydrolytic acidification, aerobic treatment, biological filtration tower treatment and the like. The treated wastewater can achieve stable up-to-standard discharge.

Description

technical field [0001] The invention relates to a treatment method for printing and dyeing wastewater. Background technique [0002] Printing and dyeing is an important process in the textile industry. Printing and dyeing can increase the color of textiles and improve the quality of human life. In the printing and dyeing process, printing and dyeing wastewater will inevitably be produced, and the COD of the wastewater Cr The concentration is high, the chroma is large, and the alkalinity is high. If it is directly discharged into the environment, it will cause serious pollution to the environment. At present, the treatment methods of printing and dyeing wastewater mainly include biochemical treatment methods, physical chemical methods and chemical treatment methods. These treatment methods have high treatment costs and unstable effects, making it difficult to meet the discharge standards stably. Due to the addition of sulfuric acid in the biochemical method, a large amoun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/32
CPCC02F1/52C02F1/66C02F1/705C02F3/02C02F3/34C02F9/00C02F2101/32C02F2101/322
Inventor 龙炳清韩燕霜孙彦君
Owner SICHUAN NORMAL UNIVERSITY
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