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Method for recycling high acid crude oil electric desalting wastewater

A high-acid crude oil, treatment method technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. The comprehensive indicators are outstanding, the effect of reducing the number of regenerations and prolonging the service life

Active Publication Date: 2012-05-09
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-air 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 effluent
CN1209302C provides a kind of method of flocculation-electroheterogeneous catalytic oxidation treatment of naphthenic acid wastewater, the process of this method is more complicated, energy consumption is high, and the treatment effect of naphthenic acid is limited
Among them, the cost of advanced oxidation technology is relatively high, most of which are in the laboratory research stage, and the technology maturity is low; membrane technology has high requirements for water inflow, and the membrane is easy to clog; activated carbon adsorption technology is relatively mature, and there are still regeneration problems, which generally need to be combined with other treatments Technology optimization combination to improve treatment effect and reduce treatment cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021]An oil refinery used oil separation-flotation-A / O treatment process to process high-acid crude oil electric desalination wastewater. The COD of the A / O section effluent was 660mg / L, pH=7.0, khaki and turbid, and it was difficult to discharge up to the standard. The analysis by gas chromatography / mass spectrometry and electrospray mass spectrometry confirmed that the organic matter in the biochemical effluent was mainly naphthenic acid which was difficult to biodegrade.

[0022] Add 60mg / L of polyferric sulfate flocculant to the above wastewater, and the flocculation time is 60min. The supernatant water separated by sedimentation is filtered with 0.8m thick quartz sand (particle size 0.6-1.2mm) at a filtration rate of 6m / h. The COD is 380mg / L, and the COD removal rate is 42.4%.

[0023] Sand filtered water is treated with activated biological activated carbon column (diameter 10cm, carbon layer height 1.5m, coal-based activated carbon φ1.5×4mm) for adsorption biochemical ...

Embodiment 2

[0027] An oil refinery used oil separation-flotation-A / O-MBR treatment process to process high-acid crude oil electric desalination wastewater. The COD of the MBR effluent in the final stage was 220mg / L, transparent and light yellowish yellow, and it was difficult to meet the discharge standard. The analysis by gas chromatography / mass spectrometry and electrospray mass spectrometry confirmed that the organic matter in MBR effluent is mainly naphthenic acid which is difficult to biodegrade, with a molecular weight of 102-596 and a ring number of 0-6.

[0028] After the wastewater was treated according to the process and conditions of Example 1, the effluent COD was 30 mg / L, and the COD removal rate was 86.4%.

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Abstract

The invention discloses a method for recycling high acid crude oil electric desalting wastewater. The method comprises the following steps of: performing oil removal, suspended matter treatment and microbial biochemical treatment on the high acid crude oil electric desalting wastewater; and performing flocculation, sand filtration, biological activated carbon treatment and electro-adsorption treatment on microbial biochemical treatment effluent in sequence, wherein flocculation and sand filtration are performed to remove suspended matters and a part of colloids or dissolvable organic matters from the biochemical treatment effluent; biological activated carbon treatment is performed to further remove the colloids and dissolvable organic matters; and electro-adsorption treatment is performed to remove salts and ionic organic matters such as naphthenic acid and the like. The COD (Chemical Oxygen Demand) of treatment effluent is less than or equal to 50 mg / L, and the strict local discharge standard (COD is less than or equal to 60 mg / L) can be met; and the treatment effluent can be recycled into a circulating water system or an electric desalting device as desalted water, so that water is saved and discharge is reduced.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a deep or reuse treatment method for high-acid crude oil electric desalination wastewater. Background technique [0002] At present, the traditional oil separation-flotation-biochemical process is generally used for the treatment of electric desalination wastewater in oil refineries. When this process treats high-acid crude oil electric desalination wastewater, the COD of the effluent is usually higher than 200mg / L. The effluent treated by A / O is even as high as 700-800mg / L, far exceeding the national wastewater discharge standard (COD≤100mg / L). With the increasing processing volume of low-quality high-acid crude oil in my country and the implementation of stricter local wastewater discharge standards (COD≤60mg / L) in some areas, the contradiction of meeting the discharge standards for high-acid crude oil desalination wastewater will become more prominent....

Claims

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Application Information

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