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Treatment method for discharging naphthenic acid wastewater within controlling index of national standard

A treatment method, naphthenic acid technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve problems such as shortened service life, decline, membrane clogged flux, etc. Achieve the effect of easy operation, low energy consumption and good stability

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

[0006] At present, membrane technology is widely used as an advanced treatment method for oil refinery wastewater. Naphthenic acid is easy to form calcium naphthenate, which deposits on the surface of the membrane, causing membrane clogging and flux decline, shortening its service life.

Method used

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Examples

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Embodiment

[0018]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 A / O section and MBR treatment effluent were 740mg / L and 220mg / L respectively, far exceeding the discharge standard (100mg / L). The effluent from the above-mentioned A / O and MBR was earthy yellow and turbid. It was confirmed by gas chromatography / mass spectrometry and electrospray mass spectrometry that the organic matter in it was mainly naphthenic acid, which was difficult to biodegrade, and the contents were 176mg / L and 47.4mg / L respectively. The COD of naphthenic acid is estimated to be 492mg / L and 133mg / L respectively, accounting for 66.8% and 60.7% of the COD of A / O and MBR effluent. Considering that the effluent treated by MBR is still difficult to meet the standard, its operating cost is relatively high, and naphthenic acid may form naphthenic acid insoluble salt deposits on the surface of the membrane, which reduce...

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Abstract

The invention discloses a treatment method for discharging naphthenic acid wastewater within the controlling index of the national standard. Wastewater treatment comprises oil removing treatment, biological treatment, acidification-coagulation, Fenton oxidation treatment, flocculation-sand filtration and biological activated carbon treatment, wherein the acidification-coagulation is performed under the acid condition to precipitate macromolecular naphthenic acid and remove the precipitated macromolecular naphthenic acid from wastewater under the coagulation action; the Fenton oxidation treatment is performed on micromolecular naphthenic acid and other organic matters to partially oxidize completely and partially improve the biodegradability; and deep biological activated carbon treatment is performed on dissolvable organic matters left after the Fenton oxidation. Due to the adoption of the method, organic matters such as naphthenic acid and the like are effectively removed finally, the COD (Chemical Oxygen Demand) of treatment effluent is less than or equal to 40 mg / L, the strict local discharge standard (COD is less than or equal to 60 mg / L) can be met, and the environmental riskof wastewater discharge is lowered; and the method is suitable for discharging various types of naphthenic acid-containing wastewater such as electrical desalting wastewater for processing high acid crude oil or polymer flooding oil field wastewater and the like within the controlling index of the national standard.

Description

technical field [0001] The invention relates to a treatment method for naphthenic acid wastewater, in particular to a treatment method for various types of naphthenic acid-containing wastewater in oil refineries or oil fields, and is especially suitable for treating wastewater with relatively high naphthenic acid content. Background technique [0002] Naphthenic acid is a complex mixture of alkyl-substituted acyclic or alkyl-substituted alicyclic carboxylic acids, and is a natural component of petroleum. The molecular weight of naphthenic acid is generally 100 to 1300, and it contains monovalent to tetravalent carboxyl groups. One-membered naphthenic acid is more common, with a molecular weight of 100-600, a boiling point of 250-350°C, and a general molecular formula of C n h 2n+Z o 2 , where n is the number of carbons, Z is the degree of hydrogen unsaturation, which is 0 or a negative even number, and -Z / 2 is the number of rings. Naphthenic acid is difficult to volatili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 李凌波
Owner CHINA PETROLEUM & CHEM CORP
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