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Oxidation-flocculation-multilayer filtering treatment process for alkali-decrement wastewater in printing and dyeing industry

A technology of alkali reduction wastewater and multi-layer filtration, which is applied in textile industry wastewater treatment, filtration treatment, oxidized water/sewage treatment, etc. It can solve the problems of high concentration and refractory degradation, and achieve the effect of reducing load and saving costs

Inactive Publication Date: 2017-01-18
WUXI MINGSHENG TEXTILE MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the corrosion of the outer fiber by alkali, the polyester fiber becomes thinner and softer after reduction, resulting in a silk-like soft feel and elegant feeling, but the reduction of polyester also brings high concentration, high alkalinity, and difficult to degrade Organic Wastewater - Alkali Mineral Wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] An oxidation-flocculation-multilayer filtration treatment process for alkali weight reduction wastewater in the printing and dyeing industry, comprising:

[0022] (1) pretreatment of alkali reduction waste water, recovery of terephthalic acid and its salts;

[0023] (2) the waste water after the pretreatment is passed into ozone to be oxidized;

[0024] (3) adding soluble iron salt to the wastewater after ozone oxidation for flocculation and precipitation treatment;

[0025] (4) Pass the wastewater treated by flocculation and sedimentation into the multi-layer filter equipment. The multi-layer filter equipment is fed with water from the bottom, and is provided with a gravel layer, a diatomite layer and an activated carbon layer according to the flow direction of the wastewater, and purified water is obtained at the top.

Embodiment 2

[0027] An oxidation-flocculation-multilayer filtration treatment process for alkali weight reduction wastewater in the printing and dyeing industry, comprising:

[0028] (1) pretreatment of alkali reduction waste water, recovery of terephthalic acid and its salts;

[0029] (2) the waste water after the pretreatment is passed into ozone to be oxidized;

[0030] (3) adding soluble iron salt to the wastewater after ozone oxidation for flocculation and precipitation treatment;

[0031] (4) Pass the wastewater treated by flocculation and sedimentation into the multi-layer filter equipment. The multi-layer filter equipment is fed with water from the bottom, and is provided with a gravel layer, a diatomite layer and an activated carbon layer according to the flow direction of the wastewater, and purified water is obtained at the top.

[0032] (5) Pass the obtained purified water into the plant treatment pool for purification. Plants such as reeds, duckweeds, and lotus roots are pla...

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Abstract

The invention discloses an oxidation-flocculation-multilayer filtering treatment process for alkali-decrement wastewater in the printing and dyeing industry. The process comprises the steps that 1, alkali-decrement wastewater is pretreated, and terephthalic acid and its salt are recovered; 2, ozone is led to the wastewater obtained after pretreatment for oxidation; 3, soluble iron salt is added to the wastewater obtained after ozone oxidation to perform flocculent precipitation treatment; 4, the wastewater subjected to the flocculent precipitation treatment is led to a multi-layer filtering device, water is fed into the multi-layer filtering device from the bottom, a gravel layer, a diatomite layer and an activated carbon layer are arranged in the flowing direction the wastewater, and purified water is obtained from the top. The ketones, alcohols, organic amines, benzene series, thiophene and a part of organic esters in water can be effectively removed by adopting the treating process, and after continuous operation for half a year, the COD is smaller than 10 mg / L, the chroma removal rate is above 99-99.9%, and the ammonia nitrogen removal rate is kept above 99%.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to an oxidation-flocculation-multilayer filtration treatment process for alkali weight reduction wastewater in the printing and dyeing industry. Background technique [0002] Printing and dyeing is a traditional characteristic industry in my country. In recent years, it has developed rapidly in Jiangsu, Zhejiang, Guangdong and coastal areas. However, the pollution caused by printing and dyeing wastewater has become increasingly prominent with the expansion of the industrial scale. The printing and dyeing industry is a large discharge of industrial wastewater. According to incomplete statistics, the daily discharge of printing and dyeing wastewater in my country is about 3×10 6 ~4×10 6 m 3 . [0003] In recent years, the share of polyester chemical fiber in the textile market has been increasing. In 1991, my country's polyester output was 1.015 million tons. By Novemb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F9/14C07C63/26C07C51/42C07C63/28
CPCC02F9/00C02F1/001C02F1/5236C02F1/78C02F3/32C02F2101/32C02F2101/322C02F2101/34C02F2101/38C02F2101/40C02F2103/30C07C51/42C07C63/26C07C63/28
Inventor 张达明
Owner WUXI MINGSHENG TEXTILE MACHINERY
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