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Effective printing and dyeing sewage treatment method

A printing and dyeing sewage and treatment method technology, which is applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, textile industry wastewater treatment, etc. It can solve the problem of unstable effluent quality, large floor area, and poor treatment effect, etc. problems, to achieve good nitrogen and phosphorus removal effect, small footprint, and stable effect

Inactive Publication Date: 2012-09-12
CHANGSHU RES INSTITUE OF NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] Aiming at the problems in the treatment of printing and dyeing sewage disclosed in the prior art, such as poor treatment effect, unstable effluent quality, large floor area, large mud production, and high treatment cost, the present invention provides an effective treatment method for printing and dyeing sewage , the use of the present invention can achieve better treatment effect, so that the treatment area occupies a small area, the sludge output is low, the investment and operation cost is low, and the effect is stable, so that the various indicators of printing and dyeing sewage treatment can reach the discharge standards stipulated by the state.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0034] A printing and dyeing enterprise in Yixing, Jiangsu discharged sewage, COD was 445.4mg / L, NH 3 -N is 37.45mg / L, TN is 42.3mg / L, TP is 13.1mg / L, and the chromaticity is 230 times. The hydrolysis tank adopts an upflow hydrolysis tank, and the sewage enters from the bottom of the hydrolysis tank, and the water is dispersed and distributed through the water distribution system for hydrolysis and acidification, and the residence time is 30h. After the sewage is hydrolyzed and acidified, the effluent overflows into A through the upper overflow weir of the upflow hydrolysis tank. 2 The O(PACT) reaction tank flows through the anaerobic tank, the anoxic tank and the aerobic tank, and internal reflux (reflux ratio 50%) and sludge reflux (reflux ratio 250%) are set at the end of the aerobic tank.

[0035]Powdered activated carbon is added to the aerobic pool, the dosage is 100mg / L, and the residence time is 20h. After biological treatment, the effluent enters the coagulation sed...

Embodiment 2

[0039] Wastewater discharged from a printing and dyeing enterprise in Xuchang, Henan, COD is 755.4mg / L, NH 3 -N is 67.45mg / L, TN is 72.3mg / L, TP is 15.1mg / L, and the chromaticity is 330 times. Other operating conditions are the same as in Example 1, but internal return (reflux ratio 25%) and sludge return (return ratio is 300%) are set at the end of the aerobic tank. After treatment, the effluent quality COD is 55.2mg / L, NH 3 -N is 1.77mg / L, TN is 14.6mg / L, TP is 0.36mg / L, and the chromaticity is 20 times. The effluent water quality indicators of each section of the whole process are shown in Table 2.

[0040] Table 2 Outlet water quality indicators of each section (unit: mg / L)

[0041]

Embodiment 3

[0043] A printing and dyeing enterprise in Zhejiang, sewage discharge: COD is 456.4mg / L, NH 3 -N is 57.45mg / L, TN is 63.3mg / L, TP is 12.5mg / L, and the chromaticity is 290 times. Other operating conditions are the same as in Example 1. The hydrolytic acidification tank adopts a push-flow type, and the hydrolytic acidification residence time is 24 hours. After the treatment, the effluent water quality COD is 50.2mg / L, and the NH 3 -N is 1.37mg / L, TN is 12.6mg / L, TP is 0.41mg / L, and the chromaticity is 18 times.

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Abstract

The invention discloses an effective printing and dyeing sewage treatment method, belongs to the field of industrial sewage treatment and is suitable for treating sewage difficult to degrade. The effective printing and dyeing sewage treatment method comprises the steps of automatically flowing printing and dyeing sewage into a primary settling tank to remove settleable substances and floaters in the sewage; pumping water out of the primary settling tank into a hydrolysis and acidification tank for hydrolysis and acidification; carrying out biological treatment on water out of the hydrolysis and acidification tank in an A2O reaction tank in which powdered activated carbon is fed; and carrying out coagulative precipitation on sewage subjected to biological treatment in a coagulative precipitation tank and discharging. After the printing and dyeing sewage is treated by the method, various effluent water indexes can basically reach the discharge standards of Major Water Pollutant Emission Limit of Urban Sewage Treatment Plants and Key Industries in Taihu (DB32 / T1072-2007). Through the method, the problems of bad treatment effect, unstable effluent water quality, large floor area, large sludge yield and high treatment cost of a traditional process are solved, and the economic and efficient treatment of the printing and dyeing sewage is realized.

Description

technical field [0001] The invention relates to an effective treatment method for printing and dyeing sewage, which belongs to the field of industrial sewage treatment and is also applicable to the treatment of other refractory sewage. Background technique [0002] Printing and dyeing sewage is the main discharge of the textile printing and dyeing industry. According to incomplete statistics, the national annual output of printing and dyeing sewage is about 3.6×10 9 t, accounting for about one-third of the entire industrial wastewater. Strengthening the treatment of printing and dyeing sewage plays an important role in protecting the environment and maintaining ecological balance. Printing and dyeing sewage has the characteristics of large chroma, high organic matter content, large changes in water temperature, water quantity, water quality and pH value, which brings difficulties to the treatment of sewage. In recent years, with the use of a large number of new additives a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/30C02F103/30
Inventor 秦健张宇刘明星陈鹂
Owner CHANGSHU RES INSTITUE OF NANJING UNIV OF SCI & TECH
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