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High-concentration phenol-containing wastewater precipitation method phenol removal and recovery method

A recovery method and technology for phenol wastewater, applied in chemical instruments and methods, water pollutants, multi-stage water treatment, etc., can solve the problems of heavy metal pollution, high operating cost, long process flow, etc., and achieve low discharge concentration and equipment structure. Simple, technically stable and reliable results

Pending Publication Date: 2021-07-02
NANJING LIUYAN ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention provides a high-concentration phenol-containing wastewater precipitation method for phenol removal and recovery, which is used to overcome the defects of long process flow, high energy consumption, high operating cost and heavy metal pollution in the prior art for treating chemical wastewater

Method used

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  • High-concentration phenol-containing wastewater precipitation method phenol removal and recovery method

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Embodiment 1

[0030] Applying the above-mentioned device for treating high-concentration phenol-containing wastewater, after degreasing and deacidifying the wastewater of a coal gasification project, the total phenol content in the wastewater is 5000mg / L, and the Ba of the primary precipitation reaction is 2+ ions using BaCl 2 , HCl is used for the acidification of barium phenolate, the pH value of the first-order precipitation reaction is controlled to 9.1, and NaOH is selected as the pH regulator. After the first-order precipitation reaction, the recovery rate of phenol reaches 88%, the residual phenol concentration in the wastewater is 600mg / L, and the COD concentration is 3000mg / L L, to meet the water intake requirements of the subsequent biochemical treatment section. Residual Ba in wastewater after primary precipitation reaction 2+ The ion concentration is 2100mg / L, the Ba of the secondary precipitation reaction 2+ The ion precipitant uses Na 2 SO 4 , control the pH value of the s...

Embodiment 2

[0032] Using the above-mentioned device for treating high-concentration phenol-containing wastewater, after the wastewater of a coking project is deoiled, deacidified and deaminated, the total phenol content in the wastewater is 9000mg / L, and the Ba of the primary precipitation reaction is 2+ ions using BaCl 2 , HCl is used for the acidification of barium phenolate, the pH value of the primary precipitation reaction is controlled to 9.8, and NaOH is selected as the pH regulator. After the primary precipitation reaction, the recovery rate of phenol reaches 90%, the residual phenol concentration in the wastewater is 900mg / L, and the COD concentration is 4500mg / L L, to meet the water intake requirements of the subsequent biochemical treatment section. Residual Ba in wastewater after primary precipitation reaction 2+ The ion concentration is 2000mg / L, the Ba of the secondary precipitation reaction 2+ The ion precipitant uses Na 2 SO 4 , the pH value of the secondary precipitat...

Embodiment 3

[0034] Using the above-mentioned device for treating high-concentration phenol-containing wastewater, after degreasing and deacidifying the wastewater of a semi-coke project, the total phenol content in the wastewater is 15000mg / L, and the Ba of the primary precipitation reaction 2+ ions using BaCl 2 2H 2 0, HCl is used for barium phenol hydrochloride, and the pH value of the primary precipitation reaction is controlled to 11. NaOH is used as the pH regulator. After the primary precipitation reaction, the recovery rate of phenol reaches 94.7%, the residual phenol concentration in the wastewater is 800mg / L, and the COD concentration is 4000mg / L, to meet the water intake requirements of the subsequent biochemical treatment section. Residual Ba in wastewater after primary precipitation reaction 2+ The ion concentration is 2000mg / L, the Ba of the secondary precipitation reaction 2+ The ion precipitant uses Na 2 SO 4 , the pH value of the secondary precipitation reaction is c...

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Abstract

The invention discloses a high-concentration phenol-containing wastewater precipitation method phenol removal and recovery method which comprises the following steps that high-concentration phenol-containing wastewater subjected to oil removal, acid removal and ammonia removal is continuously connected in series with and enters a two-stage precipitation and separation unit, Ba<2+> ions are adopted as a precipitant for primary precipitation, phenol in the high-concentration phenol-containing wastewater is precipitated and separated, Ba<2+> ion precipitant is adopted for secondary precipitation, the residual Ba<2+> ions in the wastewater are precipitated and separated, the Ba<2+> ions can be soluble barium salts such as BaCl2, Ba(NO3)2 and the like, and after phenol barium salts are generated, the Ba<2+> ions can be regenerated by regeneration of acid containing the same anions. The Ba<2+> ion precipitant can be Na2SO4, H2SO4, CO2, sulfate, carbonate and other substances, and insoluble barium salt precipitate can be completely generated after the Ba<2+> ion precipitant reacts with Ba<2+> ions. The optimal COD of the dephenolized wastewater treated by the method can be as low as 3000 mg / L or below, the total phenols are lower than 200 mg / L, the Ba<2+> concentration is lower than 5 mg / L, the safe and stable operation requirements of conventional subsequent biochemical treatment are met, the discharge concentration of heavy metal Ba<2+> is low, and the strict environment-friendly discharge standard requirement can be met.

Description

technical field [0001] The invention relates to a method for removing and recovering phenol by a precipitation method in high-concentration phenol-containing wastewater, and belongs to the technical field of high-concentration phenol-containing wastewater treatment. Background technique [0002] Coal chemical wastewater is a kind of high-concentration organic wastewater with extremely complex pollutant components and many refractory substances. The industry's wastewater pollution is extremely serious. Among them, phenolic pollutants are highly toxic and have complex components. They include not only unit phenols but also polyphenols. On the one hand, phenolic pollutants are also difficult-to-treat pollutants in coal chemical wastewater treatment. If they are not treated properly, they will affect the subsequent The normal operation of the treatment unit, on the other hand, recovers high-value phenolic substances from wastewater, realizes waste recycling, can obtain high eco...

Claims

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Application Information

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IPC IPC(8): C02F1/58C02F101/34
CPCC02F1/58C02F2101/345C02F2301/08C02F2209/06C02F2209/08
Inventor 刘大华徐延忠陈任远
Owner NANJING LIUYAN ENVIRONMENTAL PROTECTION TECH CO LTD
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