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Recycling method for sodium-alkali-process desulphurization liquid

A treatment method and desulfurization liquid technology, applied in chemical instruments and methods, multi-stage water treatment, water/sewage treatment, etc., can solve the problems of high energy consumption and high suspended solids content

Inactive Publication Date: 2018-03-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects existing in the prior art, the purpose of the present invention is to provide a method for resource recovery of sodium-alkali desulfurization liquid. The method realizes the recovery of salt resources in sodium-alkali desulfurization liquid on the basis of effectively treating the sodium-alkali desulfurization liquid. Recycling, solving the problems of high suspended solids content and high energy consumption in the treatment process of sodium-alkali desulfurization liquid, and finally realizing the recycling of sodium-alkali desulfurization liquid

Method used

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  • Recycling method for sodium-alkali-process desulphurization liquid

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Effect test

Embodiment 1

[0076] The main water quality characteristics of sodium-alkali desulfurization liquid are: total dissolved solids 60000mg / L, suspended solids 1000mg / L, oil content 0mg / L, Na + 18000mg / L, Cl - 100mg / L, SO 4 2- 42000mg / L, COD 0mg / L, Mg 2+ 15mg / L, Ca 2+ 100mg / L, soluble silicon 2mg / L.

[0077] The processing steps are as follows:

[0078] The first step is to use ceramic membrane filtration to remove the suspended solids in the sodium-alkali desulfurization solution. The ceramic membrane filter selects a ceramic membrane filter element with a pore size of 50nm, and the filtration pressure is set to 0.08MPa. The content of suspended solids in the water filtered by the ceramic membrane is 1.0mg / L; The suspended solids separated by ceramic membrane filtration are collected and solidified, and then transported outside for treatment;

[0079] In the second step, the water filtered by the ceramic membrane enters the high-efficiency electrodialysis unit for concentration. The high...

Embodiment 2

[0084] The main water quality characteristics of sodium-alkali desulfurization liquid are: total dissolved solids 65000mg / L, suspended solids 1500mg / L, oil content 0.3mg / L, Na + 20000mg / L, Cl - 120mg / L, SO 4 2- 45000mg / L, COD 10mg / L, Mg 2+ 17mg / L, Ca 2+ 110mg / L, soluble silicon 4mg / L.

[0085] The processing steps are as follows:

[0086] The first step is to use ceramic membrane filtration to remove suspended solids in the sodium-alkali desulfurization solution. For ceramic membrane filtration, a ceramic membrane filter element with a pore size of 100nm is selected, and the filtration pressure is set to 0.10MPa. The content of suspended solids in the water filtered by the ceramic membrane is 0.7mg / L; the suspended solids separated by ceramic membrane filtration are collected and solidified, and then transported outside for treatment;

[0087] In the second step, the water filtered by the ceramic membrane enters the high-efficiency electrodialysis unit for concentration....

Embodiment 3

[0092] The main water quality characteristics of sodium-alkali desulfurization liquid are: total dissolved solids 75000mg / L, suspended solids 2500mg / L, oil content 0.8mg / L, Na + 23000mg / L, Cl - 140mg / L, SO 4 2- 52000mg / L, COD 20mg / L, Mg 2+ 23mg / L, Ca 2+ 135mg / L, dissolved silicon 5mg / L.

[0093] The processing steps are as follows:

[0094] The first step is to use ceramic membrane filtration to remove suspended solids in the sodium-alkali desulfurization solution. For ceramic membrane filtration, a ceramic membrane filter element with a pore size of 100nm is selected, and the filtration pressure is set to 0.12MPa. The content of suspended solids in the water filtered by the ceramic membrane is 0.8mg / L; The suspended solids separated by ceramic membrane filtration are collected and solidified and then transported out for treatment;

[0095] In the second step, the water filtered by the ceramic membrane enters the high-efficiency electrodialysis unit for concentration. Th...

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Abstract

The invention relates to a recycling method for sodium-alkali-process desulphurization liquid. The method realizes recycling of sodium-alkali-process desulphurization liquid by using ceramic membranefiltration, membrane-coupled system concentration and freezing crystallization technology. The method realizes recycling of sodium-alkali-process desulphurization liquid, recovers salts in sodium-alkali-process desulphurization liquid on the basis of removal of suspended solids in desulphurization liquid, overcomes the problem of difficulty in treatment of sodium-alkali-process desulphurization liquid for petrochemical enterprises, and carries out resource utilization on high-sulfur-content waste water from petrochemical enterprises on the basis of standard-reaching discharging of the waste water. Reverse-osmosis fresh water (i.e., produced water) formed after treatment of the method reaches standard and can be directly discharged or reused, so standard-reaching discharging of sodium-alkali-process desulphurization liquid is realized; meanwhile, a high-purity sodium sulfate crystal salt obtained after treatment of the method can be recycled as a regenerated source, and thus, resource utilization is realized.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a method for resourceful treatment of sodium-alkali desulfurization liquid. In particular, it refers to the treatment method of using ceramic membrane filtration + membrane coupling system concentration + freezing crystallization technology to treat the sodium-alkali desulfurization liquid of petrochemical enterprises, so that it can meet the discharge standards and realize resource utilization. Background technique [0002] As the consumption of fossil fuels continues to increase in modern society, air pollutants such as SOx, NOx, and dust are also produced in large quantities, and a large amount of these substances discharged into the atmosphere will cause serious air pollution. SO 2 , NOx and particulate matter emissions are strictly restricted in my country, and the Petrochemical Industry Pollutant Discharge Standard (GB31571-2015) requires SO 2 less than 100m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F103/18
CPCC02F1/44C02F1/441C02F1/4693C02F9/00C02F2001/5218C02F2103/18C02F2301/08
Inventor 章晨林张新妙栾金义
Owner CHINA PETROLEUM & CHEM CORP
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