Treatment method for high-concentration sulfur-containing caustic sludge wastewater from oil refinery

A technology for alkali slag wastewater and treatment method, which is applied in the directions of oxidized water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. To deal with problems such as poor effect, to achieve the effect of convenient operation and maintenance, good biodegradability and stable operation

Inactive Publication Date: 2011-03-16
惠州TCL环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In order to improve the treatment effect of alkali slag wastewater and provide a new sewage solution for oil refineries, especially in view of the problems existing in the current alkali slag t

Method used

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  • Treatment method for high-concentration sulfur-containing caustic sludge wastewater from oil refinery
  • Treatment method for high-concentration sulfur-containing caustic sludge wastewater from oil refinery

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The source of sewage is catalytic gasoline alkali residue wastewater from a certain oil refinery, in which COD is 456300mg / L, sulfide is 23500mg / L, volatile phenol is 93560mg / L, and the color is greater than 37000 times. Take 2m of catalytic gasoline alkali residue wastewater 3 , add precipitant copper sulfate, the molar ratio of precipitant and sulfide is 1.00:1.00, aeration and stirring for 60 minutes, when the alkali slag wastewater stays in the sedimentation tank for 3 hours, the sulfide in the wastewater is 300mg / L, remove The rate reaches 98.8%, the chromaticity is obviously improved, the toxicity is reduced, and the residual Cu=0.01mg / L. The main component of the produced precipitate is CuS, which can be calcined to generate CuO, which can be directly reused or acidified with sulfuric acid to generate CuSO 4 Use it later.

[0035] The wastewater coming out of the sedimentation tank enters the acidification tank, adjusts the pH to 5.3 with concentrated sulfuric a...

Embodiment 2

[0039]The source of sewage is catalytic diesel alkali residue wastewater from an oil refinery, in which COD is 135600mg / L, sulfide is 12965mg / L, volatile phenol is 9765mg / L, naphthenic acid is 4.5%, and the chromaticity is greater than 45000 times. The catalytic diesel alkali residue wastewater is 20m 3 , add regenerated precipitant copper oxide, the molar ratio of precipitant and sulfide is 1.40:1.00, aerate and stir for 90 minutes, when the alkali slag wastewater stays in the sedimentation tank for 2 hours, the sulfide in the wastewater is 77.8mg / L , the removal rate reached 99.4%, the chroma was significantly improved, the toxicity was reduced, and the residual Cu=1.20mg / L; the effluent went to the acidification tank, and the pH value was adjusted to 5.7 with concentrated sulfuric acid, and stood for 3 hours to recover the crude phenol, and then acidified to The pH value is 3.3, let it stand for 3 hours, and the sulfur-free naphthenic acid is obtained by stratification. At t...

Embodiment 3

[0041] The source of sewage is catalytic diesel alkali residue wastewater from a refinery, in which COD is 30000mg / L, sulfide is 8000mg / L, volatile phenol is 9765mg / L, naphthenic acid is 4.5%, and the chromaticity is greater than 10000 times. The catalytic diesel alkali residue wastewater is 20m 3 , add regenerated precipitant copper oxide, the mol ratio of precipitant and sulfide is 0.6: 1.00, aeration and stirring 30 minutes, when alkali slag waste water is 1 hour in the settling tank, sulfide is 40mg / L in the waste water, The chromaticity is obviously improved and the toxicity is reduced.

[0042] The effluent goes to the acidification tank, the pH value is adjusted to 5.0 with concentrated sulfuric acid, and the phenol is recovered for 2 hours. The crude phenol is then acidified to a pH value of 2.0. The flocculation reactor is set with a current intensity of 15A, an alternating pulse period of 60s, and an electrolysis time of 3 hours, and then flows into the Fenton’s reag...

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Abstract

The invention relates to a treatment method for high-concentration sulfur-containing caustic sludge wastewater from an oil refinery. The main process comprises precipitation, acidification, electrocoagulation and Fenton reagent oxidation. The method comprises the following steps of: adding a precipitator into the high-concentration sulfur-containing caustic sludge wastewater refined from the oil refinery so as to remove sulfide, sulfur ether, sulfur alcohol and other malodorants, greatly reduce odor of caustic residue and reduce toxicity of water body; then acidifying and recovering crude phenol and naphthenic acid; and performing oxidation treatment through an electrocoagulation-Fenton reagent so as to remove most of the polluted and nonbiodegradable organic matters from the wastewater. The limit of COD concentration and sulfur content of water inlet is improved to the greatest degree, the need of a large amount of dilution water is saved in the conventional operation process, the crude phenol and naphthenic acid in the caustic residue wastewater are effectively recovered, and no secondary pollution is produced in the operation process.

Description

technical field [0001] The invention relates to a treatment method for high-concentration sulfur-containing alkali residue wastewater in an oil refinery, using a precipitant to first remove sulfide, sulfide, mercaptan and other foul-smelling substances in the wastewater, reduce water toxicity, and acidify and recover crude phenol and naphthene acid, and then remove the organic matter in the wastewater by electrocoagulation-Fenton reagent oxidation, which improves the biodegradability of the wastewater while removing most of the COD. Background technique [0002] In the process of petroleum refining and processing, alkali washing process is usually used to remove sulfide in oil products. In the process of alkali washing, various alkali slag wastewater containing high concentration of sulfide and refractory organic matter will be produced, and its CODcr, The emissions of sulfides and phenols are as high as 30%-40% of the total pollutant emissions of refineries. With the increa...

Claims

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Application Information

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IPC IPC(8): C02F9/06C07C37/86C07C39/00C07C51/487C07C61/00C02F1/72
Inventor 王治军周瑞君覃骏刘巍
Owner 惠州TCL环境科技有限公司
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