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
CN104909421AInactive Publication Date: 2015-09-16SOUTH CHINA UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SOUTH CHINA UNIV OF TECH
Publication Date
2015-09-16
Estimated Expiration
Not applicable · inactive patent

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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.
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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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