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Extracting agent and method for synergistically extracting refractory pollutants and phenol in coal chemical wastewater

A technology for coal chemical wastewater and extractant, applied in water pollutants, chemical instruments and methods, extraction water/sewage treatment, etc., can solve the problem of poor phosphite treatment effect, increased proportion of phosphite, and poor treatment process Influence and other problems, to achieve the effect of low solubility, easy degradation, and no secondary pollution

Active Publication Date: 2021-06-29
INST OF PROCESS ENG CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

[0006] In the long-term research process, the inventors conducted a comprehensive GC-MS analysis on the effluent of coal chemical wastewater in different treatment stages, and found that some phosphites accounted for a relatively large proportion of effluent at each stage. With the gradual increase of other pollutants removal, the proportion of these phosphites in the wastewater increases, which has a negative impact on the post-extraction treatment process
The extraction agents and extraction methods of the current prior art have poor treatment effects on these phosphites

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] An extraction agent for synergistically extracting refractory pollutants and phenols in coal chemical wastewater, including a main extraction agent and a co-extraction agent, the main extraction agent is 75% toluene and 25% dioctyl adipate, and the co-extraction agent is 35% 2-heptanol and 55% heptane and 10% 2-octanone. The volume fraction of the main extractant is 60%, and the volume fraction of the co-extractant is 40%.

[0024] The pH of the coal chemical wastewater is 9.8, adjust the pH to 8.3, use the aforementioned extractant to extract, the extraction temperature is 50°C, the extraction time is 25min, the total phenol removal rate is 96%, the oil removal rate is 92%, and the phosphite removal rate is 96%. 92%.

Embodiment 2

[0026] An extractant for synergistically extracting refractory pollutants and phenols in coal chemical industry wastewater, including a main extractant and a co-extractant, the main extractant is 66% pentylbenzene and 34% dibutyl sebacate, and the co-extractant It is 30% 2-methylpentanol, 60% pentane and 10% 2,5-hexanedione. The volume fraction of the main extractant is 65%, and the volume fraction of the co-extractant is 35%.

[0027] The pH of the coal chemical industry wastewater is 10.1, adjust the pH to 5.0, use the aforementioned extractant to extract, the extraction temperature is 20°C, the extraction time is 5min, the total phenol removal rate is 98%, the oil removal rate is 93%, and the phosphite removal rate is 98%. 95%.

Embodiment 3

[0029] An extractant for synergistic extraction of refractory pollutants and phenols in coal chemical wastewater, including main extractant and co-extractant, the main extractant is 60% butylbenzene, 20% amyltoluene and 20% dipentyl oxalate Esters, the co-extractant is 50% 3,5,5-trimethylhexanol and 40% 2,3-dimethylbutane and 5% 2,5-hexanedione, 5% 2-octyl ketone. The volume fraction of main extraction agent is 80%, and the volume fraction of co-extraction agent is 20%.

[0030] The coal chemical wastewater is adjusted to a pH of 6.1, extracted with the aforementioned extractant, the extraction temperature is 62°C, and the extraction time is 10 minutes. The total phenol removal rate is 98%, the oil removal rate is 93%, and the phosphite removal rate is 95%.

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Abstract

The invention discloses an extracting agent and a method for synergistically extracting refractory pollutants and phenol in coal chemical wastewater, and belongs to the technical field of wastewater treatment. The extraction agent is a mixture formed by compounding a non-polar organic matter and a medium-polar organic matter and is composed of a main extraction agent and a synergistic extraction agent, and the main extraction agent is a mixture of benzene series and organic esters and is mainly responsible for extracting phenolic substances in wastewater; and the synergistic extraction agent is a mixture of alcohols, alkanes and ketones, and is mainly responsible for extracting refractory pollutants, especially phosphite ester, with different polarities in the wastewater. According to the extraction agent provided by the invention, on the premise that the removal rate of phenolic substances exceeds 95%, the removal rate of oil exceeds 90%, especially the removal rate of phosphite exceeds 92%. The extraction method provided by the invention does not change the wastewater treatment process, is simple to operate, low in solubility, easy to degrade and free of secondary pollution, provides a new idea for efficient treatment of the coal chemical wastewater, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and relates to an extraction agent and a method for synergistically extracting refractory pollutants and phenol in coal chemical wastewater. Background technique [0002] Coal chemical wastewater contains a large number of toxic pollutants and inorganic substances, including high concentrations of ammonia, phenol, heterocyclic compounds, polycyclic compounds, etc. These pollutants have a wide concentration distribution and many types, and the properties of pollutants vary greatly. It is currently recognized as a type of wastewater that is very difficult to treat. To treat pollutants in coal chemical wastewater, it is usually necessary to extract high-concentration pollutants from the pollutants by means of extraction, and then use biological methods to degrade residual organic matter, and finally use advanced oxidation for biodegradable substances , flocculation and other methods of...

Claims

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Application Information

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IPC IPC(8): C02F1/26C02F1/40C02F101/34C02F101/30C02F103/10
CPCC02F1/26C02F1/40C02F2101/34C02F2101/30C02F2103/10Y02W10/10
Inventor 宁朋歌曹宏斌石凤琼许高洁
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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