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Method for processing printing and dying wastewater

A printing and dyeing wastewater treatment method technology, which is applied in the field of efficient use of sunlight to treat printing and dyeing wastewater, can solve problems such as unsatisfactory effects, secondary pollution, and poor deodorization effects, and achieve easy promotion, high-efficiency utilization, and excellent results

Inactive Publication Date: 2011-08-10
上海图和环保材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The treatment of printing and dyeing wastewater with flocculants is still effective for the precipitation of suspended solids, but the effect of reducing COD, BOD and chroma is not ideal, especially the deodorization effect is even worse, and it will also cause secondary pollution, which cannot be fundamentally solve the pollution problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: After the printing and dyeing wastewater is pretreated through a stainless steel filter with a pore size of 5-8mm coated with titanium, it is introduced into a treatment pool. Adjust the pH value to 5 by acid-base titration, then add 0.1wt% photocatalyst according to the weight of the imported printing and dyeing wastewater, start the stirring motor, and turn on the blower to supply oxygen to the wastewater pool. Start timing after the introduction of sunlight, and take samples for testing after 3 hours of irradiation.

Embodiment 2

[0019] Embodiment 2: After the printing and dyeing wastewater is pretreated through a stainless steel filter screen with a titanium-plated pore diameter of 5-8 mm, it is introduced into a treatment pool. Adjust the pH value to 7 by acid-base titration, then add 0.5wt% photocatalyst according to the weight of the imported printing and dyeing wastewater, start the stirring motor, and turn on the blower to supply oxygen to the wastewater pool. Start timing after the introduction of sunlight, and take samples for testing after 5 hours of irradiation.

Embodiment 3

[0020] Embodiment 3: After the printing and dyeing wastewater is pretreated through a stainless steel filter with a titanium-plated surface of 5-8 mm in diameter, it is introduced into a treatment pool. Adjust the pH value to 9 by acid-base titration, then add 1.0wt% photocatalyst according to the weight of the imported printing and dyeing wastewater, start the stirring motor, and turn on the blower to supply oxygen to the wastewater pool. Start timing after the introduction of sunlight, and take samples for testing after 3 hours of irradiation.

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Abstract

The invention discloses a technology of processing printing and dying wastewater and particularly relates to a technology of processing the printing and dying wastewater by effectively utilizing sunlight on the basis of a nano photocatalysis technology. Particularly, the method for processing the printing and dying wastewater comprises the following steps of: firstly filtering the printing and dying wastewater by a filtering screen to remove block dirt so as to prevent generating catalyst from poisoning and prolong the service life of a catalyst; then regulating the PH of the printing and dying wastewater by sodium hydroxide; adding a photochemical catalyst into the printing and dying wastewater and simultaneously leading sunlight into the printing and dying wastewater; and carrying out sunlight irradiation for over 3 hours under the conditions of stirring, blowing air and supplying oxygen. In the invention, the photocatalysis technology is used for processing the printing and dying wastewater; secondary pollution is effectively avoided; the method is energy-saving and environmentally friendly; the used catalyst can simultaneously utilize both the ultraviolet band and the visible light band in sunlight and has high sunlight utilization rate and catalyzing efficiency; and the COD (chemical oxygen demand), the BOD (biochemical oxygen demand) and the chroma removal rate of the printing and dying wastewater can achieve 99 percent.

Description

Technical field [0001] The invention discloses a printing and dyeing wastewater treatment technology, and in particular relates to a technology based on nano photocatalysis technology that can efficiently utilize sunlight to treat printing and dyeing wastewater. Background technique [0002] Printing and dyeing wastewater has complex components, dark color, and large discharge volume. It has always been one of the most difficult industrial wastewater at home and abroad. People spend a lot of material and financial resources to solve this difficult problem for this reason. The current treatment methods for printing and dyeing sewage mainly include biochemical methods, electrolysis methods, and photocatalytic methods. The biochemical method occupies a large area, has a narrow scope of application, and the effect is not ideal; although the electrolysis method is better than the biochemical method, it consumes a lot of energy and is difficult to popularize. Photocatalysis has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F1/30C02F1/66C02F103/30
CPCY02W10/37
Inventor 余晓锦
Owner 上海图和环保材料科技有限公司
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