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Treatment method for high salt content and high COD alkaline residue neutralization water

A technology of alkali slag and content, applied in chemical instruments and methods, natural water treatment, extracted water/sewage treatment, etc., can solve the problems of high effluent COD and ineffective treatment of effluent, and achieve improved standard discharge, easy biochemical treatment, The effect of reducing solubility

Active Publication Date: 2012-05-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method only involves acidification to recover naphthenic acid and phenol, but the COD of the effluent is still high, and there are still problems that the effluent cannot be effectively treated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A stream of alkali washing gasoline alkali slag wastewater, after neutralization and recovery of phenols, the COD of alkali slag neutralized water is 5.22×10 4 mg / L, the total salt content is 9.13×10 4 mg / L, pH<2. Using the method of the present invention, firstly, the temperature of the alkali slag neutralizing water is lowered from room temperature 20°C to -1°C. Since the concentration of the alkali slag wastewater is relatively high, the crude kerosene agent can be used for multi-stage extraction. Organic amine extractants can be used. Adopt C8 trialkyl tertiary amine single-stage extraction (i.e. 1st-stage extraction) and gas oil 7-stage cross-flow extraction respectively, the ratio of water to water is 4, and the waste extractant after using trialkyl tertiary amine extraction needs to use 20% NaOH solution regeneration.

[0020] After treatment, the total salt content of the alkali slag neutralized water was reduced to 4.23×10 4 mg / L, the total salt removal rat...

Embodiment 2

[0022] A stream of alkali washing diesel oil alkali slag wastewater, after neutralization and recovery of naphthenic acid, the COD of alkali slag neutralized water is 9.42×10 3 mg / L, the total salt content is 1.63×10 5 mg / L, pH3~4. When using the method of the present invention, since the concentration of the alkali slag wastewater is low, an organic amine extractant is selected, and the pH of the alkali slag neutralization water needs to be adjusted to below 2. The temperature of the wastewater is lowered from room temperature 20°C to 1°C, using C9 trialkyl tertiary amine for single-stage extraction, the ratio of water to water is 4, and the waste extractant after use is regenerated with 20% NaOH solution.

[0023] After the above treatment, the total salt content of the alkali slag neutralized water was reduced to 4.61×10 4 mg / L, the removal rate of total salt was 71.7%, and after single-stage extraction with trialkyl tertiary amine, the COD was reduced to 2.21×10 3 mg / L,...

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PUM

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Abstract

The present invention relates to a treatment method for high salt content and high COD alkaline residue neutralization water. According to the method, an extraction treatment is performed at a temperature of -5-5 DEG C, wherein an extraction agent is a petroleum fraction and / or an organic amine; the extracted material is subjected to settlement separation to obtain the oil phase, the water phase and the solid substance. With the method of the present invention, the high COD removal efficiency can be obtained by using the simple extraction method, the high desalination effect can be obtained, the biodegradability of the treated effluent is improved, and the impact on the wastewater treatment plant is reduced.

Description

technical field [0001] The invention provides a treatment method for neutralizing water with high salt content and high COD alkali slag. The neutralization water of alkali slag mainly includes: diesel oil alkali slag neutralizes wastewater after recovering naphthenic acid; liquid hydrocarbon or gasoline alkali slag is oxidized by wet method, Neutralize waste water after recovery of crude phenol, etc. The main pollutants of these wastewater are acid-base neutralization to produce a large amount of salt, as well as residual naphthenic acid and phenolic substances. Dealing with field shocks is huge. Background technique [0002] In the process of alkaline cleaning and refining of oil products in refineries, alkaline waste liquid containing high concentrations of pollutants is produced, and its COD, sulfide and phenol emissions account for more than 40% to 50% of the emissions of such pollutants in refineries. It is mainly composed of atmospheric diesel soda residue, catalytic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/26C10G21/14C10G21/20C10G21/12C01D5/00C07C51/48C02F101/32C02F103/34
Inventor 赵磊刘忠生王有华王新
Owner CHINA PETROLEUM & CHEM CORP
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