Bleaching and dyeing wastewater treatment method with combination of advanced oxidation and ultrafiltration

An advanced oxidation and wastewater treatment technology, applied in the field of water treatment, can solve the problems of lack of water treatment technicians in bleaching and dyeing factories, the inability to meet the outlet of bleaching and dyeing wastewater, and the difficulty of long-term stable operation of biological methods, so as to achieve excellent effluent quality and eliminate concentration extremes The effect of modernization and low operating cost

Inactive Publication Date: 2015-08-19
SUZHOU MOHAI SEPARATION TECH
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Problems solved by technology

However, with the development of the industry, a large number of complex and refractory organic substances such as various new dyes and new additives have entered the wastewater, making the bleaching and dyeing wastewater a high-concentration, refractory, toxic and harmful industrial wastewater, which is difficult to adopt traditional conventional biochemical treatment. Meet environmental protection requirements
[0003] At present, there are some defects in the advanced treatment combination technology of printing and dyeing wastewater commonly used, which cannot meet the outlet of bleaching and dyeing wastewater. For example, a Chinese patent on a recycling process and equipment for printing and dyeing wastewater with high salinity and high chroma (CN201210289827.X) proposes the use of advanced oxidation +Sand filter combined process, but this method uses traditional sa

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  • Bleaching and dyeing wastewater treatment method with combination of advanced oxidation and ultrafiltration

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Example Embodiment

[0028] Example 1

[0029] This embodiment discloses a bleaching and dyeing wastewater treatment method combining advanced oxidation and ultrafiltration membrane separation, including the following steps:

[0030] The first step, pretreatment in the regulating tank: Put several kinds of bleaching and dyeing wastewater in the regulating tank, adjust the water volume and pH of the bleaching and dyeing wastewater, and adjust the pH value of the bleaching and dyeing wastewater to 3.0-4.0.

[0031] The second step, the first-level advanced oxidation treatment: transport the bleaching and dyeing wastewater in the adjustment tank to the first-level advanced oxidation tank, add ferrous ions and hydrogen peroxide, and oxidize and decompose the dye and part of COD in the bleaching and dyeing wastewater. The wastewater from advanced oxidation treatment enters the sedimentation tank. The amount of ferrous ion and hydrogen peroxide added is: 0.2~0.4mg / L of ferrous ion, 0.6~1.2ml / L of hydrogen per...

Example Embodiment

[0041] Example 2

[0042] In Example 2, the technology of combining secondary advanced oxidation and ultrafiltration membrane separation disclosed in Example 1 was used for bleaching and dyeing wastewater treatment: the original wastewater COD was about 760mg / L, the color was 824 times, and the combined system in Example 1: After the secondary advanced oxidation and ultrafiltration membrane separation process, the effluent COD <200mg / L, color <10, characteristic pollutant indicators and conventional water quality indicators meet the "Water Pollutant Discharge Standard for Textile Dyeing and Finishing Industry" (GB4287-2012).

[0043] It can be seen from this that the bleaching and dyeing wastewater treatment method of the present invention aims at the problem of difficult degradation of bleaching and dyeing wastewater. By setting up a secondary advanced oxidation tank, under the action of advanced oxidants, the macromolecular refractory organic matter in the bleaching and dyeing was...

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Abstract

The invention relates to a bleaching and dyeing wastewater treatment method with the combination of advanced oxidation and ultrafiltration membrane separation. The bleaching and dyeing wastewater treatment method comprises four steps of pretreatment in an adjusting tank, primary advanced oxidation treatment, secondary advanced oxidation treatment and ultrafiltration membrane separation treatment. Bleaching and dyeing wastewater is collected into the adjusting tank and then enters a primary advanced oxidation tank after pH adjustment, ferrous iron and hydrogen peroxide are added for oxidation, the wastewater is oxidated and then flows into a sedimentation tank, supernate in the sedimentation tank flows into a secondary advanced oxidation tank, after the wastewater is further oxidated, a pH value is adjusted to 8.0, so as to remove iron ions and ferrous ions generated during advanced oxidation, and subsequently, the wastewater enters a rotary cross-flow type membrane separation device, so as to remove suspended matters and sediments from the wastewater and complete wastewater treatment. The method has the advantages of simple process flow, less investment, low energy consumption and simplicity and convenience in maintenance.

Description

technical field [0001] The invention belongs to the field of water treatment, in particular, the combination of advanced oxidation and membrane separation technology is applied to sewage treatment, and in particular relates to a bleaching and dyeing wastewater treatment method combined with advanced oxidation and ultrafiltration. Background technique [0002] Before the 1980s, the biodegradability of bleaching and dyeing wastewater in my country was relatively high, and physicochemical treatment + biochemical treatment processes were generally adopted, and the wastewater could meet the discharge standard. However, with the development of the industry, a large number of complex and refractory organic substances such as various new dyes and new additives have entered the wastewater, making the bleaching and dyeing wastewater a high-concentration, refractory, toxic and harmful industrial wastewater, which is difficult to adopt traditional conventional biochemical treatment. Mee...

Claims

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Application Information

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IPC IPC(8): C02F9/04
Inventor 廖德祥耿安朝
Owner SUZHOU MOHAI SEPARATION TECH
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