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Advanced treatment method for high-acid crude oil electric desalting wastewater

A high-acid crude oil and advanced treatment technology, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of high cost, easy clogging of membrane, high operating cost, etc. problems, to achieve the effect of convenient regeneration, effective treatment, and low operating costs

Active Publication Date: 2012-01-11
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
CN1209302C provides a kind of method of flocculation-electroheterogeneous catalytic treatment of naphthenic acid wastewater, the process of this method is 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; adsorption technology has the problem of adsorbent regeneration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] An oil refinery used oil separation-flotation-biochemical treatment process to process high-acid crude oil electric desalination wastewater. The COD of the final effluent was 260mg / L, which was difficult to meet the discharge 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.

[0019] The pH of the above wastewater is 7.0, the concentration of polyaluminum chloride flocculant added is 70mg / L, the flocculation time is 60min, the COD of the wastewater after sedimentation and separation is 140mg / L, and the COD removal rate is 46.2%.

[0020] The wastewater after flocculation treatment is further treated with EMK 400 electro-adsorption device (Changzhou Est Company). The electro-adsorption device is composed of 100 pairs of 1800mm×300mm×2.5mm electrodes. The DC voltage of each pair of electrodes is 1.5V, an...

Embodiment 2

[0023] The same wastewater as in Example 1 was added with a polymeric ferric sulfate flocculant concentration of 60 mg / L and a flocculation time of 60 min. After sedimentation and separation, the COD of the wastewater was 132 mg / L, and the COD removal rate was 49.2%.

[0024] The wastewater after flocculation treatment was further treated with the same electro-adsorption device as in Example 1, the DC voltage of each pair of electrodes was 1.6V, and the wastewater treatment capacity was 1.2m 3 / h, other conditions are the same as in Example 1. The COD of the effluent is 60mg / L, and the COD removal rate is 54.5%.

[0025] The biochemical treatment effluent was khaki, and the COD was 260mg / L. After using polyferric sulfate flocculation-electrosorption, the COD was reduced to 60mg / L, and the overall removal rate of COD was 76.9%. The water sample was almost colorless.

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PUM

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Abstract

The invention discloses an advanced treatment method for high-acid crude oil electric desalting wastewater. The method comprises the following steps of: performing oil removal treatment and biochemical treatment on the high-acid crude oil electric desalting wastewater; performing flocculation treatment on effluent obtained through biochemical treatment; performing electric adsorption treatment oneffluent obtained through flocculation treatment; and discharging effluent obtained through electric adsorption treatment after the effluent reaches a discharge standard, or recycling the effluent. By the method, the removal rate of chemical oxygen demand (COD) of the wastewater is more than or equal to 75 percent, partial inorganic salt can be removed, and the effluent obtained through the treatment can be discharged after reaching the discharge standard, and also can be recycled for an electric desalting device.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to an advanced 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. 200mg / L, far exceeding national or local wastewater discharge standards (≤100mg / L). The organic matter in high-acid crude oil electrical desalting wastewater is mainly naphthenic acid, lower fatty acids and phenolic compounds, and the content of naphthenic acid is much higher than that of ordinary crude oil electrical desalting wastewater. Since naphthenic acid is difficult to biochemically degrade effectively, the residual The high concentration makes it difficult for the COD of the treated effluent to reach the standard. With the increasing processing volume of low-quality hi...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/52C02F1/56
Inventor 李凌波
Owner CHINA PETROLEUM & CHEM CORP