Complexing centrifugal extraction method of high-concentration phenolic wastewater
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A high-concentration technology for phenol wastewater, applied in the direction of extraction water/sewage treatment, water pollutants, chemical instruments and methods, etc., can solve the problems of low phenol distribution coefficient, unsatisfactory treatment effect, secondary pollution, etc., and achieve solvent The effect of small retention, compact equipment and high production capacity
Inactive Publication Date: 2010-06-09
山西焦化股份有限公司
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The extractants used in solvent extraction are benzene, heavy benzene, light oil, heavy solvent oil, butyl acetate, isopropyl ether, N 503 etc., but most of these traditional extraction agents have low distribution coefficients for phenols, resulting in large losses, unsatisfactory treatment effects, and even secondary pollution
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Embodiment 1
[0022] like figure 1 , Pass the high-concentration phenol-containing wastewater containing 15,000 ppm of phenol into the adjustment tank, add concentrated sulfuric acid for pretreatment, and adjust the pH value to 4.
[0023] The extractant N in the extractant tank 503 The extractant pump flows to No. 1, No. 2, and No. 3 extractors in sequence; the phenol-containing wastewater with a pH value of 4 after pretreatment flows into No. 3 and No. 2 in reverse order through the inlet pump, and No. 1 has already flowed into the extractant In the extractor, the extraction reaction takes place in the extractor.
[0024] The waste water after dephenolization was discharged from No. 1 extractor, and the phenol content was detected to be 154ppm. The phenol-rich extractant after the extraction reaction is discharged from No. 3 extractor.
[0025] The phenol-rich extractant flows into No. 1, No. 2 and No. 3 strippers in sequence, and the 5% sodium carbonate dilute alkali solution is rever...
Embodiment 2
[0028] like figure 1 , Pass the high-concentration phenol-containing wastewater containing 17000ppm phenol into the adjustment tank, add concentrated sulfuric acid for pretreatment, and adjust the pH value to 5.
[0029] The extractant heavy benzene in the extractant tank flows to No. 1, No. 2, and No. 3 extractors in turn through the extractant pump; the phenol-containing wastewater with a pH value of 5 after pretreatment flows into No. 3 in reverse order through the inlet pump , No. 2, and No. 1 have flowed into the extractor of the extractant, and the extraction reaction occurs in the extractor.
[0030] The waste water after dephenolization was discharged from the No. 1 extractor, and the detected phenol content was 166ppm. The phenol-rich extractant after the extraction reaction is discharged from No. 3 extractor.
[0031] The phenol-rich extractant flows into No. 1, No. 2 and No. 3 strippers in sequence, and the 10% sodium bicarbonate dilute alkali solution is reversel...
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Abstract
The invention provides a complexing centrifugal extraction method of high-concentration phenolic wastewater, which utilizes an efficient extractor and a back wash extractor to process high-concentration phenolic wastewater. The method of the invention comprises the following steps: 1) pretreating the phenolic wastewater; 2) leading the extracting agent to flow to each extractor in turn; 3) leading the phenolic wastewater to flow reversely into each extractor which is flown with extracting agent for extraction reaction; 4) discharging the wastewater from the extractor after dephenolizing; 5) discharging the extracting agent rich in phenol from the extractor which is filled with wastewater firstly; 6) leading the extracting agent rich in phenol to flow reversely to each back wash extractor, leading the thin alkali solution to flow into each back wash extractor which is flown with extracting agent rich in phenol for backextraction reaction; and 7) discharging the phenolate generated in the backextraction reaction from the back wash extractor which is flown with extracting agent rich in phenol firstly, and discharging the extracting agent after backextraction from the back wash extractor which is flown with thin alkali solution. The invention has low cost, small floor area, great flexibility of device operation, low consumption, the phenol content of the processed water is reduced to below 200ppm, the phenol removal rate is above 99%, thus achieving the biochemical treatment water quality standard, recovering the phenol in the waste water in the form of phenolate to return to the system for reuse, and lowering environmental pollution.
Description
technical field [0001] The invention relates to a method for treating high-concentration phenol-containing wastewater. The invention adopts a reversible complexation extraction and dephenolization process, and utilizes a high-efficiency extractor and a back-extractor to treat high-concentration phenol-containing wastewater containing more than 15,000 ppm of phenol, so that The phenol content in the treated water is reduced to less than 200ppm, and the phenol removal rate is over 99%, reaching the water quality standard for biochemical treatment. At the same time, the phenol in the wastewater is recovered in the form of phenate and returned to the system for reuse. Background technique [0002] In industrial production, wastewater with a phenol concentration higher than 1000 mg / L is usually called high-concentration phenol-containing wastewater, and wastewater with a concentration of less than 1000 mg / L is called low-concentration phenol-containing wastewater. For phenol-con...
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