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Device for improving AAO treated dyeing wastewater and method thereof

A printing and dyeing wastewater, aerobic reactor technology, applied in the textile industry wastewater treatment, aerobic and anaerobic process treatment and other directions, can solve the problems that the printing and dyeing wastewater is not easy to treat and reach the standard, and the treatment operation cost is high, and the treatment operation cost and one-time investment are achieved. The effect of low cost, convenient operation and maintenance, and simple operation of the device

Inactive Publication Date: 2010-07-14
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an improved AAO device and method for treating printing and dyeing wastewater. Aiming at the problems that the printing and dyeing wastewater is not easy to be treated up to the standard, and the treatment operation cost is high, an improved AAO treatment of printing and dyeing wastewater with ideal treatment effect and economical operation cost is provided. Method and device

Method used

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  • Device for improving AAO treated dyeing wastewater and method thereof
  • Device for improving AAO treated dyeing wastewater and method thereof
  • Device for improving AAO treated dyeing wastewater and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The printing and dyeing wastewater was treated by the improved AAO device.

[0027] Control the influent COD of printing and dyeing wastewater at 620-1050mg / L, and the dye concentration between 20-40mg / L. After improving the AAO treatment device, the system effluent COD and residual dyes are respectively 45-80mg / L and 2-4.5mg / L, the COD removal rate and dye decolorization rate are both greater than 90%, and the chromaticity of the effluent dye is 40-80 times.

Embodiment 2

[0029] Control the COD of the actual printing and dyeing wastewater influent at 750-1000mg / L, and the pH between 5.5-7, so that the wastewater is treated by the improved AAO device. The COD removal rate, decolorization rate and pH changes of the system effluent show that the actual wastewater COD is 750 ~1000mg / L, the average removal rate of COD reaches 93.86%, the average chromaticity of the effluent is 20-40 times, the pH of the effluent is maintained between 8.26-8.66, and the COD, turbidity and chromaticity of the effluent all reach the "Urban Sewage Recycling - Industrial Water Quality" (GB / T19923-2005) requirements.

Embodiment 3

[0031] Control the influent COD of printing and dyeing wastewater at 600-1100mg / L, the dye concentration at 25-35mg / L, set the hydraulic retention time at 29h, and set the sludge age at 40 days, so that the wastewater is treated by the improved AAO device. The experimental results show that the COD removal rate and the dye decolorization rate of the system are maintained at a high level, the average COD removal rate and the average dye decolorization rate are 92.36% and 90.29%, respectively, and the concentration fluctuations of COD and dyestuff in the system effluent are small.

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Abstract

The invention relates to a method for improving AAO treated dyeing wastewater and a device thereof. The device comprises an anaerobic reactor, a primary settling tank, an anoxic reactor, an aerobic reactor and a secondary settling tank, wherein the anaerobic reactor is communicated with the primary settling tank, the anoxic reactor, the aerobic reactor and the secondary settling tank through pipelines in sequence; the primary settling tank is communicated with the anaerobic reactor through a sludge pump by a return pipe; the aerobic reactor is communicated with the anoxic reactor through the sludge pump by the return pipe; and the secondary settling tank is communicated with the aerobic reactor through the sludge pump by the return pipe. The method comprises the following steps: controlling the reflux ratio of sludge to be maintained at 100 percent and the reflux ratio of mixed solution to be 100 percent without sludge discharge at environmental temperature of between 20 and 30 DEG C, wherein preferably, retention period of an anaerobic unit is 6.5 hours, retention period of an anoxic unit is 6.5 hours, and the retention period of an anoxic unit is 16 hours; and then discharging water. The method and the device are organically combined with anaerobic, anoxic and aerobic biological treatment methods to achieve advantage complementation with one another.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and in particular relates to an improved AAO device and method for treating printing and dyeing wastewater. Background technique [0002] Printing and dyeing wastewater has become one of the most difficult industrial wastewater to treat due to its high organic content, complex composition, deep color, high toxicity, and large changes in water quality and water volume. On the one hand, the treatment of printing and dyeing wastewater by physical and chemical methods faces technical limitations and economic constraints, the COD removal rate is low, and may cause secondary pollution, and the environmental friendliness is relatively poor. On the other hand, biological treatment methods such as activated sludge method, anaerobic treatment technology, and hydrolytic acidification process are widely used in the treatment of printing and dyeing wastewater due to their advantages su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30C02F103/30
Inventor 陈刚陈亮陈东辉黄满红陈晔韩晓芳田世烜黄丽萍李贵梅陈晨王慧萍
Owner DONGHUA UNIV
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