Deep purification method of coking wastewater based on advanced ozone oxidation

A technology for coking wastewater and advanced oxidation is applied in the advanced treatment of effluent from biochemical treatment facilities in coking plants and in the field of coking wastewater treatment, and can solve the problems of good effect, complex process steps and unsatisfactory oxidation effect.

Inactive Publication Date: 2011-08-24
王兵 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to solve the problem that the waste water after biochemical treatment is not up to standard, and the exis...

Method used

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  • Deep purification method of coking wastewater based on advanced ozone oxidation
  • Deep purification method of coking wastewater based on advanced ozone oxidation
  • Deep purification method of coking wastewater based on advanced ozone oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Send the biochemically treated coking wastewater into the regulating pool 1 with a flow rate of 1m 3 / h, adjust the pH value of the wastewater to 8 with quicklime in the adjustment tank 1, turn on the water pump 2, pump the wastewater into the oxidation reactor 6, and add ozone-containing gas to the oxidation reactor 6, with a flow rate of 2m 3 / h, O in gas 3 The concentration is 70mg / L, that is, adding 140mg of ozone per liter of wastewater; at the same time adding 30% hydrogen peroxide, H 2 o 2 with O 3 The molar ratio of the added amount is 0.5; 53L Al is housed in the oxidation reactor 6 2 o 3 load Fe 2 o 3 The solid heterogeneous catalyst, the volume ratio of the oxidation reactor 6 to the volume of the solid heterogeneous catalyst is 1:3, and the hydraulic retention time is 5 minutes.

[0031] The oxidized waste water is filtered through the filter 7 and discharged, and the effluent COD reaches the national first-class discharge standard before being d...

Embodiment 2

[0033] Send the biochemically treated coking wastewater into the regulating tank 1 with a flow rate of 5 L / min, adjust the pH value of the wastewater to 12 with NaOH in the regulating tank, turn on the water pump 2, and pump the wastewater from the regulating tank 1 into the mixing jet 5, Open ozone generator 4 simultaneously, regulate gas flow to be 20L / min, make the gas flow of gas flow of gas generator 4 outlets and flow through the ratio of the waste water flow in mixing jet 5 be 4: 1, ozone concentration is 100mg / min in the gas. L; Open the hydrogen peroxide tank 3 at the same time, add the hydrogen peroxide with a concentration of 27%, H 2 o 2 with O 3 The molar ratio of the added amount was 1.4. Waste water, ozone, hydrogen peroxide enter in oxidation reactor 6, and hydraulic retention time is 20 minutes, and 27L TiO2 is housed in oxidation reactor 6 2 load MnO x The solid heterogeneous catalyst, the volume ratio of the oxidation reactor 6 to the volume of the...

Embodiment 3

[0036] Send the biochemically treated coking wastewater into the regulating tank 1 with a flow rate of 10L / min, adjust the pH value of the wastewater to 10 with NaOH in the regulating tank, turn on the water pump 2, and pump the wastewater from the regulating tank 1 into the mixing jet 5, and at the same time Open the ozone generator 4, adjust the gas flow to be 30L / min, so that the ratio of the gas flow at the outlet of the odor generator 4 and the waste water flow through the mixing jet 5 is 3: 1, and the ozone concentration in the gas is 80mg / L ; Open hydrogen peroxide tank 3 at the same time, adding concentration is 27% hydrogen peroxide, H 2 o 2 with O 3 The molar ratio of the added amount was 1. Waste water, ozone, hydrogen peroxide enter in the oxidation reactor 6, and the hydraulic retention time is 10 minutes, and 40L Al is housed in the oxidation reactor 6 2 o 3 load Fe 2 o 3 The solid heterogeneous catalyst, the volume ratio of the oxidation reactor 6 to...

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Abstract

The invention discloses a deep purification method of coking wastewater based on advanced ozone oxidation, belonging to the field of wastewater treatment, and particularly relating to a deep purification method for the effluent of the biochemical treatment facilities of coking plants. Aiming at the problem in the prior art, the invention provides a method for coupling homogeneous catalysis and non-homogeneous catalysis for ozone so as to realize deep purification of the effluent of the biochemical treatment facilities of coking wastewater. In the deep purification method, wastewater of which the pH value is 8-12 is subjected to homogeneous catalysis reaction in the presence of ozone and hydrogen peroxide; non-homogeneous catalysis is carried out in the presence of the non-homogeneous catalyst; thus, processed effluent COD (Chemical Oxygen Demand) is less than 100mg/L; and thus the processed effluent does not cause secondary pollution to environment.

Description

technical field [0001] The invention relates to a treatment method for coking wastewater, in particular to an advanced treatment method for effluent from biochemical treatment facilities in a coking plant, and belongs to the field of wastewater treatment. Background technique [0002] my country is a big country of coke production and consumption, especially in recent years, coke production capacity has developed rapidly. In 2007, the output of coke was 335.54 million tons, accounting for 60% of the total output of coke in the world. Coking wastewater is produced during the process of obtaining coke and gas from high-temperature pyrolysis of coal and recycling and processing tar, benzene and other by-products in the production process. Due to the influence of various factors such as the nature of raw coal, coking temperature, coking product recovery process, etc., the composition of coking wastewater is complex, containing a variety of organic substances that are difficult ...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/78
Inventor 王兵任宏洋李毅柴苗峰
Owner 王兵
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