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Treatment method of high-concentration phenolic wastewater generated in lignite upgrading process

A treatment method, the technology of phenol wastewater, applied in the direction of extraction water/sewage treatment, etc., can solve the problems of high treatment cost, high incineration temperature requirements, low organic matter content in water, etc., and achieve the effect of enhancing the extraction effect and improving the extraction performance

Inactive Publication Date: 2015-09-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And it is obviously not practical in application, there are high requirements for incineration temperature, low organic matter content in water, so the incineration value is not high, the actual treatment cost is too high, and the equipment requirements are higher when the treatment capacity is large, etc.
At present, there are very few literatures on the method of treating high-concentration phenolic ammonia wastewater produced by lignite upgrading by chemical unit operation method, and it is difficult to reduce COD and total phenols to the ideal level by using the extraction method of conventional high-concentration phenolic ammonia recovery to treat lignite upgrading wastewater

Method used

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  • Treatment method of high-concentration phenolic wastewater generated in lignite upgrading process

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Effect test

Embodiment 1

[0027] Four extraction towers are connected to process the high-concentration phenol-containing wastewater produced during the lignite upgrading process. The extraction stages of each extraction tower are 5, using methyl isobutyl ketone as the extraction agent, and the extraction temperature is 40°C. Each extraction tower The volume ratio of the extraction agent to the high-concentration phenol-containing wastewater is 1:3, and the specific process is:

[0028] The high-concentration phenol-containing wastewater after deacidification and deamination enters from the upper part of the first extraction tower, the first extraction agent enters from the bottom of the first extraction tower, and the high-concentration phenol-containing wastewater passes through the first extraction tower and the first extraction The waste water and extract I after the first extraction are obtained after continuous countercurrent extraction with the agent; the waste water after the first extraction co...

Embodiment 2

[0031]Two extraction towers are connected to process the high-concentration phenol-containing wastewater produced during the lignite upgrading process. The extraction stages of each extraction tower are 5, and methyl isobutyl ketone is used as the extraction agent. The extraction temperature is 65°C. Each extraction tower The volume ratio of the extraction agent to the high-concentration phenol-containing wastewater is 1:4, and the specific process is:

[0032] The high-concentration phenol-containing wastewater after deacidification and deamination enters the first extraction tower from the upper part of the first extraction tower, and is countercurrently extracted with the first extractant that enters from the bottom of the first extraction tower in the first extraction tower to obtain a The waste water and extract I; The waste water after the extraction from the first extraction tower still enters the second extraction tower from the second extraction tower top, and the seco...

Embodiment 3

[0035] Two extraction towers are connected to process the high-concentration phenol-containing wastewater generated during lignite upgrading. The volume ratio of the extraction agent of the tower to the high-concentration phenol-containing wastewater is 1:4, and the specific process is as follows:

[0036] The high-concentration phenol-containing wastewater after deacidification and deamination enters the first extraction tower from the upper part of the first extraction tower, and is countercurrently extracted with the first extractant that enters from the bottom of the first extraction tower in the first extraction tower to obtain a The waste water and extract I; The waste water after the extraction from the first extraction tower still enters the second extraction tower from the second extraction tower top, and the second extractant that enters from the second extraction tower still Countercurrent extraction is carried out in the second extraction tower to obtain dephenoliz...

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Abstract

The invention discloses a treatment method of high-concentration phenolic wastewater generated in a lignite upgrading process. The method comprises the following steps: high-concentration phenolic wastewater subjected to deacidification and ammonia removal enters a plurality of extraction columns connected in series, each extraction column uses a fresh extractant to perform counter-current extraction on the phenolic wastewater, and cross-flow extraction is formed between every two extraction columns. The extractant can be methyl isobutyl ketone, mesityl oxide or tert amyl methyl ether. The number of the extraction columns can be 2-4. The amounts of the fresh extractants in the extraction columns can be different. After the wastewater treated by the method is subjected to solvent stripping, the optimal COD (chemical oxygen demand) can be down to 4000 mg / L below, and the total phenol content is lower than 220ppm, thereby completely satisfying the demands for conventional subsequent biochemical treatment.

Description

technical field [0001] The invention belongs to the field of treatment and recovery methods for high-concentration phenol-containing wastewater, and in particular relates to a treatment method for high-concentration phenol-containing wastewater produced in the upgrading process of lignite. Background technique [0002] Lignite is the coal with the lowest degree of coalification, but it takes tens of millions of years to form, and it is a precious non-renewable resource. Its coalification degree is between peat and bituminous coal, and has the characteristics of high moisture content, high oxygen content, high volatile matter, and low calorific value. If lignite is not upgraded, it will be difficult to use it later. Therefore, lignite upgrading has become the key to the efficient development and utilization of lignite. Coal is thermally decomposed through the coal dry distillation process at 500-1100 degrees Celsius under the condition of isolation of air to produce gas, tar...

Claims

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Application Information

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IPC IPC(8): C02F1/26
Inventor 陈赟
Owner SOUTH CHINA UNIV OF TECH
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