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Refractory organic wastewater treatment method capable of obviously improving biodegradability of organic wastewater

A technology for organic wastewater treatment and organic wastewater, applied in water/sludge/sewage treatment, magnetic field/electric field water/sewage treatment, chemical instruments and methods, etc., can solve the problems of water environment deterioration, COD reduction, high treatment cost, etc.

Inactive Publication Date: 2011-10-05
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Refractory to biodegradable organic wastewater has high concentration of organic pollutants, stable structure, and poor biochemical properties. Conventional processes are difficult to achieve standard discharge, and the treatment cost is high. Cumulative effects of the water environment
Previous physical or chemical means to improve the biodegradability of biochemically difficult organic wastewater often required a large amount of reagent addition (calculated in tons), or a large amount of energy input (calculated in kilojoules), and the reaction time was longer (calculated in days). The effect is not significant, resulting in difficulties in reducing COD and deteriorating water environment

Method used

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  • Refractory organic wastewater treatment method capable of obviously improving biodegradability of organic wastewater
  • Refractory organic wastewater treatment method capable of obviously improving biodegradability of organic wastewater
  • Refractory organic wastewater treatment method capable of obviously improving biodegradability of organic wastewater

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0019] First, 20mL (thickness: 0.2cm) of simulated refractory organic wastewater (prepared from azo dye Acid Bright Yellow) was placed in the wastewater reaction tank of the dielectric barrier discharge low-temperature plasma experimental device.

[0020] Then, adjust the discharge parameters of the dielectric barrier discharge low-temperature plasma device as follows: the working gas is air at normal pressure, and the discharge power is 0.5W / cm 2 , the dielectric distance is 5mm; after 9 minutes of discharge, the biodegradability of the simulated refractory organic wastewater with an original biodegradability of 0.001 can be increased to 0.355. Among them, biodegradability adopts five-day biochemical oxygen demand (BOD) of organic wastewater 5 ) and chemical oxygen demand (COD Cr ) ratio calculation. Five-day biochemical oxygen demand (BOD 5 ) is determined by HJ505-2009, chemical oxygen demand (COD Cr ) is determined by GB11914-89, and the biodegradability is calculated ...

experiment example 2

[0023] First, draw 40mL (thickness 0.4cm) of simulated refractory organic wastewater (prepared from azo dye direct pink) and place it in the wastewater reaction tank of the dielectric barrier discharge low-temperature plasma experimental device.

[0024] Then, adjust the discharge parameters of the dielectric barrier discharge low-temperature plasma device as follows: the working gas is air at normal pressure, and the discharge power is 0.5W / cm 2 , the dielectric distance is 5mm; after 9 minutes of discharge, the biodegradability of the simulated refractory organic wastewater with an original biodegradability of 0.0031 can be increased to 0.353.

[0025] Experimental examples 1 and 2 show that the dielectric barrier discharge low-temperature plasma device can significantly improve the biodegradability of refractory organic wastewater in a short period of time, and meet the water quality requirements of biochemical methods.

experiment example 3

[0027] First, draw 40mL (thickness 0.6cm) of simulated printing and dyeing organic wastewater (prepared directly from azo dyes) and place it in the wastewater reaction tank of the dual-channel discharge plasma water treatment device.

[0028] Then, adjust the discharge parameters of the dual-channel discharge plasma water treatment device as follows: the working gas is normal pressure air, and the discharge power is 1.0W / cm 2 , the distance between the electrode and the liquid surface is 3mm; after 10 minutes of discharge, the biodegradability of the simulated refractory organic wastewater with an original biodegradability of 0.0046 can be increased to 0.355.

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Abstract

The invention discloses a refractory organic wastewater treatment method capable of obviously improving the biodegradability of organic wastewater. The method comprises the following step of: placing refractory organic wastewater into a low-temperature plasma environment for treatment so as to improve the biodegradability of the organic wastewater, wherein the low-temperature plasma environment is produced by a dielectric barrier discharging low-temperature plasma device or a double-channel discharging plasma device. By the treatment method, the biodegradability of the refractory organic wastewater can be fast improved (within 10 minutes), and the refractory organic wastewater can meet the requirements (the ratio of biochemical oxygen demand to chemical oxygen demand is more than or equal to 0.3) on inflow water quality in a biochemical method.

Description

technical field [0001] The invention relates to the field of water treatment and discloses an organic wastewater treatment method which can significantly improve the biodegradability of organic wastewater. The method only needs to place the refractory organic wastewater in an air low-temperature plasma environment for treatment, and the biodegradability of the refractory organic wastewater can be significantly improved within 10 minutes, and the treated refractory organic wastewater can be The biochemical properties are all greater than 0.3, which meets the requirements of biochemical treatment of influent water. The air low-temperature plasma environment is generated by a dielectric barrier discharge low-temperature plasma device or a dual-channel discharge plasma device. Background technique [0002] Refractory biodegradable high-concentration organic wastewater is the main source of COD in water bodies, and its effective treatment is a major problem facing domestic and fo...

Claims

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Application Information

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IPC IPC(8): C02F1/48C02F101/38
Inventor 陈杰瑢赵菁
Owner XI AN JIAOTONG UNIV
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