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Coagulation sedimentation method for advanced treatment of printing and dyeing wastewater

A technology for coagulation and sedimentation and printing and dyeing wastewater, which is applied in textile industry wastewater treatment, flocculation/sedimentation water/sewage treatment, etc. It can solve the problems of low coagulation and sedimentation efficiency and large amount of coagulant used

Inactive Publication Date: 2009-06-03
JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI
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Problems solved by technology

[0006] Aiming at the problems of large amount of coagulant used in advanced treatment of printing and dyeing wastewater, low efficiency of coagulation and sedimentation, and efficient use of coagulant in coagulation and sedimentation, the present invention provides a coagulation and sedimentation method for advanced treatment of printing and dyeing wastewater. Treatment of printing and dyeing wastewater after effective biochemical treatment reduces the amount of coagulant and achieves a good coagulation and sedimentation effect, and the indicators of the effluent meet the discharge standards

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  • Coagulation sedimentation method for advanced treatment of printing and dyeing wastewater

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Effect test

Embodiment 1

[0017] use as figure 1 The coagulation sedimentation tank with the structure shown is fed into the printing and dyeing wastewater of a certain factory after biochemical treatment (anaerobic hydrolysis + A / O process). The water quality index of printing and dyeing wastewater after biochemical treatment COD: 150.6mg / L, NH 3 -N: 3.45mg / L, TN: 17.2mg / L, TP: 1.2mg / L, chromaticity 80 times. The coagulant is polyaluminum chloride (PAC), and the dosage is 200mg / L. The sludge settling area 12 is equipped with a return pump 2 for sludge return, which is completed through the return pipe 11, and the return ratio is 100%. After the wastewater enters the coagulation sedimentation tank from the water inlet pipe a, it is fully mixed with fresh coagulant and return sludge in the mixing zone 4 under the action of the fast mixer 1, and then enters the coagulation zone 6 through the diversion pipe 5 to coagulate and settle together , the slow speed mixer 3 stirs, and the effluent is collected...

Embodiment 2

[0019] Other operating conditions are the same as in Example 1, but no reflux is used. After treatment, the effluent water quality COD: 69.4mg / L, NH 3 -N: 1.54mg / L, TN: 15.6mg / L, TP: 0.3mg / L, chromaticity 30 times. The removal rate of each index COD: 53.9%, NH 3 -N: 55.4%, TN: 9.3%, TP: 75%, Chroma 62.5%.

Embodiment 3

[0021] Other operating conditions are the same as in Example 1, no reflux is used, the amount of PAC coagulant used is 230mg / L, and the effluent quality COD after treatment: 58.4mg / L, NH 3 -N: 1.12mg / L, TN: 14.6mg / L, TP: 0.3mg / L, chromaticity 20 times. The removal rate of each index COD: 61.2%, NH 3 -N: 67.5%, TN: 15.1%, TP: 75%, Chroma 75%.

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Abstract

The invention provides a coagulation sedimentation method for advanced treatment of printing and dyeing wastewater, which belongs to the field of organic wastewater advanced treatment. After the biochemical treatment, the printing and dyeing wastewater flows into a coagulation sedimentation tank where the wastewater is thoroughly mixed with the coagulant agent and the sludge in the mixing region and then the mixture undergoes the coagulation sedimentation in the coagulation region; the sludge is returned after the coagulation sedimentation and mixing; the wastewater, the coagulant agent and the returned sludge are subjected to the mixed treatment; and the effluent is collected and then discharged. The coagulation sedimentation method enhances the effect of coagulation sedimentation treatment, reduces the consumption of coagulant agent and increase the coagulation sedimentation efficiency. The water quality of the effluent is significantly better than that of the effluent from the coagulation sedimentation free of return tank, and the sedimentation efficiency is also improved. The biochemical tail water of the printing and dyeing wastewater after the coagulation sedimentation treatment has high water quality of the effluent, meets the national discharge standard of pollutants, and has high economic, social and environmental benefits.

Description

technical field [0001] The invention relates to a method for advanced treatment of printing and dyeing wastewater, in particular to a coagulation and sedimentation method for advanced treatment of printing and dyeing wastewater after biochemical treatment. Background technique [0002] Coagulation sedimentation is a means commonly used in the advanced treatment of industrial wastewater, which can effectively remove suspended solids or colloidal pollutants in wastewater and reduce the chroma of wastewater. The effect of coagulation and sedimentation depends on the selection of coagulant. So far, the development and application of various inorganic coagulants, organic coagulants, microbial coagulants and composite coagulants have largely solved the problem of water pollution. Among them, inorganic coagulants are the most widely used in printing and dyeing. There are a large number of engineering practices in the treatment of water, paper, and drinking water. The amount of in...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F103/30
Inventor 吴海锁吴伟张龙刘伟京喻学敏许明白永刚郭方峥
Owner JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI
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