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Comprehensive treatment method for exhaust gas and waste water in production of wooden material activated carbon

A technology for the production and comprehensive treatment of activated carbon, which is applied in the field of environmental management to achieve the effect of solving treatment problems, reducing COD significantly, and realizing emission reduction and recycling.

Inactive Publication Date: 2018-11-06
CHONGQING BEYOND OCEAN CARBON MFR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is still no report on the reduction of COD in wastewater and the fixation of carbon dioxide in waste gas by using microalgae combined nutrition.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: Add the ammonium phosphate of 0.1% (w / v) in the sawdust activated carbon production waste water, and adjust waste water pH value to 6.0 with ammonia water, prepare microalgae organic carbon source culture system; Inoculation Chlorella sorokiniana CS-01, cultivated under light at 25°C; dedusting, burning, cooling, and air-conditioning treatment of activated carbon production waste gas in sequence, and passing the tail gas with a carbon dioxide concentration of 1% (v / v) into the microalgae culture system for 15 days of culture; after the culture is completed, Microalgae are separated, and the wastewater is discharged into the municipal sewage pipe network for subsequent treatment. In this embodiment, the removal rate of COD in the wastewater is 95%, and the recovery rate of carbon dioxide in the tail gas is 75%.

Embodiment 2

[0017] Embodiment 2: Add the potassium dihydrogen phosphate of 2% (w / v) in the waste water of sawdust activated carbon production, and adjust waste water pH value to 7.5 with ammonia water, prepare microalgae organic carbon source culture system; Inoculation Chlorella sorokiniana CS-01, light culture at 35°C; dedusting, burning, cooling, and air-conditioning treatment of activated carbon production waste gas in sequence, and passing the tail gas with a carbon dioxide concentration of 10% (v / v) into the microalgae culture system for 20 days; after the culture is completed, Microalgae are separated, and the wastewater is discharged into the municipal sewage pipe network for subsequent treatment. In this embodiment, the removal rate of COD in the wastewater is 96%, and the recovery rate of carbon dioxide in the tail gas is 73%.

Embodiment 3

[0018] Embodiment 3: Add the ammonium phosphate of 5% (w / v) in the sawdust activated carbon production waste water, and adjust waste water pH value to 8.0 with ammonia water, prepare microalgae organic carbon source culture system; Inoculation Chlorella sorokiniana CS-01, light culture at 30°C; the waste gas from activated carbon production is dedusted, burned, cooled, and air-adjusted in sequence, and the tail gas with a carbon dioxide concentration of 5% (v / v) is passed into the microalgae culture system for 15 days; after the culture is completed, Microalgae are separated, and the wastewater is discharged into the municipal sewage pipe network for subsequent treatment. In this example, the removal rate of COD in the waste water was 94%, and the recovery rate of carbon dioxide in the tail gas was 71%.

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Abstract

The invention discloses a comprehensive treatment method for exhaust gas and waste water in production of wooden material activated carbon, belongs to the technical field of environment treatment, andsolves the technical problems of high waste water treatment cost, high COD emission and high exhaust gas carbon emission in treatment of the waste water and the exhaust gas in the existing wooden material activated carbon production process. The treatment method includes the following steps: first adding a phosphorus source and ammonia water into the waste water to adjust the pH value and preparea microalgae culture system, inoculating microalgae for cultivation, then introducing the waste gas subject to dusting, burning, cooling and regulating into the microalgae culture system as a supplementary inorganic carbon source and separating the microalgae after the cultivation to achieve the effect that the COD of the waste water is greatly reduced, and the carbon dioxide content of the exhaust gas is significantly reduced. The method is simple in process, low in energy consumption, low in cost and environmental friendly, and has good environmental and social benefits due to the fact thatthe COD of the waste water in the production of wooden material activated carbon is reduced by 90%, and the recovery rate of carbon dioxide in the exhaust gas is more than 70%.

Description

technical field [0001] The invention belongs to the field of environmental management, and relates to a method for treating waste water and waste gas prepared by activated carbon, in particular to a comprehensive treatment method for waste gas and waste water in the production of woody raw material activated carbon. Background technique [0002] In the production of activated carbon from woody raw materials, acetic acid, methanol, tar and other substances produced by the dry distillation of woody raw materials in the carbonization section are distilled out together with water to form waste water with high COD. Although this kind of waste water can be used to extract acetic acid and other substances, the cost is relatively high. When the wastewater is discharged, it cannot be directly connected to the municipal sewage pipe network due to the high COD, so COD reduction is required. The activation tail gas produced by the activation section contains carbon dioxide, carbon monox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14B01D53/84C12N1/12C12R1/89
CPCB01D53/84C12N1/12C02F1/66C02F3/322Y02P20/59Y02A50/20
Inventor 刘必衍曾惜齐高相陈柏蓉王小云曾露
Owner CHONGQING BEYOND OCEAN CARBON MFR
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