High acid crude oil electric desalting wastewater treatment method

A technology of high-acid crude oil and treatment method, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, general water supply saving, etc. Effects of environmental risks, less reagent consumption, and less floor space

Active Publication Date: 2013-05-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

US5976366 uses a two-stage oil-water separation-gas stripping-activated carbon adsorption-flocculation process to treat electric desalination wastewater. The process is complicated and the operating cost is high, and the treatment effect of high-acid crude oil electric desalination wastewater has not been seen.
CN1078567C extracts naphthenic acid wastewater with a mixed solvent of tertiary amine and diesel oil, the extract is back-extracted with sodium hydroxide lye, and the extractant is separated and reused. The reagent consumption of this method is large, the cost is high, and the extraction process is easy to produce Emulsification, high COD of treated effl

Method used

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Examples

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Example Embodiment

[0019] Example 1

[0020] The current treatment process of electrical desalination wastewater in a high-acid crude oil refinery is as follows: air-lift purified water is used as high-acid crude oil electrical desalination washing water. After oil separation and flotation treatment, the electrical desalination wastewater is mixed with assumed clean water for A / O treatment, after the A / O treatment effluent settles or clarifies, the MBR treatment is carried out. The COD of MBR treated effluent exceeds 200 mg / L, far exceeding the current emission standard (COD≤100 mg / L), and it is even more difficult to meet increasingly stringent local emission standards (COD≤60 mg / L).

[0021] Comprehensive analysis of the wastewater from the electric desalination biochemical treatment of the refinery, the A / O section and MBR treatment effluent are turbid, with COD of 740 mg / L and 220 mg / L, respectively. The gas chromatography / mass spectrometry and electrospray mass spectrometry Analysis confirmed ...

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Abstract

The present invention discloses a high acid crude oil electric desalting wastewater treatment method, which comprises that high acid crude oil electric desalting wastewater is sequentially subjected to an oil and suspended solid removing treatment, a sequencing batch reactor activated sludge treatment (SBR), a flocculation treatment, a Fenton oxidation treatment and a membrane bioreactor (MBR) treatment, wherein SBR is mainly provided for removing BOD and ammonia nitrogen, the flocculation treatment and the Fenton oxidation treatment are mainly provided for treating naphthenic acid and other organic matters difficultly degraded by SBR, and MBR is provided for deep treatment of residual dissolved organic matters and suspended solids after the Fenton oxidation treatment. According to the present invention, COD in the treated effluent is less than or equal to 40 mg/L, ammonia nitrogen in the treated effluent is less than or equal to 2 mg/L, petroleum in the treated effluent is less than or equal to 2 mg/L, and turbidity is less than 1 NTU, such that the stringent local discharging standard can be met, and the effluent can be used as influent for reverse osmosis constant depth reuse treatments. The method is suitable for standard discharging treatments of electric desalting wastewater from high acid crude oil processing or polymer flooding oil field wastewater and various naphthenic acid-containing wastewater.

Description

Technical field [0001] The invention belongs to the technical field of wastewater treatment, and specifically relates to a method for treating high-acid crude oil electric desalination wastewater. Background technique [0002] At present, the electric desalination wastewater of oil refineries is generally treated by the traditional oil separation-flotation-biochemical-clarification or sand filtration process. When this process is used to treat high-acid crude oil electric desalination wastewater, the COD of the effluent is usually higher than 200 mg / L, and some are higher. The A / O treatment effluent of the electric desalination wastewater of acid crude oil is even as high as 700-800 mg / L, which far exceeds the national wastewater discharge standard (COD≤100 mg / L). As the processing volume of low-quality and high-acid crude oil in my country increases year by year, and some regions implement stricter local wastewater discharge standards (COD≤60 mg / L), the contradiction in the disc...

Claims

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Application Information

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IPC IPC(8): C02F9/14
CPCY02A20/131
Inventor 李凌波
Owner CHINA PETROLEUM & CHEM CORP
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