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Method for high-efficiency combined treatment of printing and dyeing wastewater

A technology for printing and dyeing wastewater and a treatment method, which is applied in the field of printing and dyeing wastewater treatment, can solve the problems of unstable effluent quality, poor treatment effect, and large floor space, and achieves low investment and operation cost, stable effect, and small floor space. Effect

Inactive Publication Date: 2009-06-03
JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the problems in the treatment of printing and dyeing wastewater disclosed in the prior art, such as poor treatment effect, unstable effluent quality, large floor area, and large mud production, the present invention provides an efficient combined treatment method for printing and dyeing wastewater. The present invention can achieve better treatment effect, and has the advantages of small area occupied by the treatment area, low sludge production area, low investment and operation cost, and stable effect, so that the various indicators of printing and dyeing wastewater treatment can reach the discharge standards stipulated by the state.

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  • Method for high-efficiency combined treatment of printing and dyeing wastewater

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Embodiment 1

[0025] A printing and dyeing company discharges sewage, COD is 544.4mg / L, NH 3 -N is 35.45mg / L, TN is 40.3mg / L, TP is 11.1mg / L, and the chromaticity is 300 times. The hydrolysis tank adopts an upflow hydrolysis tank, and the wastewater 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 24h. After the wastewater is hydrolyzed and acidified, the effluent overflows into the A / O (PACT) reaction tank through the upper overflow weir of the upflow hydrolysis tank, flows through the A tank and the O tank, and sets the internal return and sludge return at the end of the O tank. The total return ratio is 400%. Powdered activated carbon is added to pool O with a dosage of 50mg / L, carbon source methanol is added to pool A with a dosage of 50mg / L, and the residence time is 16h. After biological treatment, the effluent enters the coagulation sedimentatio...

Embodiment 2

[0029] In addition, a printing and dyeing company discharges sewage, COD is 750mg / L, NH 3 -N is 85.92mg / L, TN is 92.49mg / L, TP is 12.2mg / L, and the chromaticity is 400 times. Other operating conditions are the same as implementation example 1, and the effluent water quality COD after treatment is 51.6mg / L, NH 3 -N is 1.78mg / L, TN is 13.8mg / L, TP is 0.2mg / L, and the chromaticity is 10 times. The effluent water quality indicators of each section of the entire combined process are shown in Table 2.

[0030] Table 2 The effluent water quality indicators of each section of another printing and dyeing wastewater treatment combined process (unit: mg / L)

[0031] flooded hydrolytic acidification A / O (PACT) Coagulation and sedimentation filter Total removal rate (%) COD 750.0 470.6 196.6 72.8 51.6 93.1 NH 3 -N 85.92 53.21 5.78 2.53 1.78 97.9 TN 92.49 75.5 30.2 16.2 13.8 85.1 TP 12.2 8.3 2.1 0.3 0.2 98.4 Chroma (ti...

Embodiment 3

[0033] Other operating conditions are the same as in Example 1. The hydrolysis tank is a baffle type hydrolysis tank, and the waste water is hydrolyzed and acidified through 5 grids from top to bottom. The indicators of the effluent quality are: COD is 432.2mg / L, NH 3 -N is 29.86mg / L, TN is 32.3mg / L, TP is 7.5mg / L, and the chromaticity is 160 times. The treatment effect of the whole process on wastewater is close to the result of Example 1.

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Abstract

The invention discloses a method for high-efficiency combined treatment of printing and dyeing wastewater, which belongs to the field of the organic wastewater treatment. The method comprises the following steps: pumping printing and dyeing wastewater to a hydrolysis pool for hydrolysis and acidification treatments; pumping the wastewater to an A / O (PACT) bioaugmentation reaction tank for biological treatment after hydrolysis and acidification treatments; subjecting the biologically-treated wastewater to the coagulation sedimentation; filtering after the coagulation sedimentation; and discharging. With the treatment method, the water quality of the effluent can meet the strictest effluent discharge standard of China, 'Discharge Standard of Main Water Pollutants for Municipal Wastewater Treatment Plant and Key Industries of Taihu Area' (DB32 / T1072-2007). The method has the advantages of less occupied area, low sludge discharge, stable treatment effect and low running cost; achieves the effect of efficient treatment of printing and dyeing wastewater, and overcomes the problem of high-efficiency treatment of printing and dyeing wastewater in the prior art.

Description

technical field [0001] The invention relates to a treatment method of printing and dyeing wastewater, specifically, refers to the process of treating various mixed wastewater generated in the printing and dyeing process by using the combined process of hydrolysis acidification-A / O (PACT) bioaugmentation-coagulation filtration method. Background technique [0002] The amount of printing and dyeing wastewater is relatively large, accounting for more than 35% of industrial wastewater, and 90% is discharged as wastewater. At the same time, the composition of printing and dyeing wastewater is complex, the water quality changes greatly, the concentration of organic matter is high, the biodegradability is poor, and the chroma is high. The economical and effective treatment of it has always been the difficulty of industrial wastewater treatment and the focus of general attention from all walks of life. With the shortage of water resources and insufficient water environment capacity...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/28C02F3/30C02F1/52C02F103/30
Inventor 喻学敏张龙吴伟刘伟京许明涂勇吴海锁李爱民
Owner JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI
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