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System and method for treating high-salinity spent caustic wastewater

A treatment system and treatment method technology, which is applied in the petrochemical industry sewage treatment field, can solve the problems of high saline-alkali residue wastewater investment and high operating costs, and achieve the effects of reducing COD and toxicity, good application prospects, and small equipment footprint

Inactive Publication Date: 2019-12-13
BEIJING DILI WEIYE TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a treatment system for treating high-salt-alkali-slag wastewater by combining physical chemistry and electrochemistry under normal temperature and pressure, which can solve the investment problem of high-salt-alkali-slag wastewater in the prior art and high operating costs, to achieve efficient, economical, and environmentally friendly treatment of high-salt-alkali slag wastewater

Method used

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  • System and method for treating high-salinity spent caustic wastewater

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Embodiment 1

[0034] Utilize the processing system and method as described above of the present invention to process 1.0m 3 / h Catalytic gasoline high-salt-alkali slag wastewater from a refinery, in the wastewater, COD49800mg / L, sulfide 8540mg / L, volatile phenol 8600mg / L. The whole process includes:

[0035] 1) The high-salt-alkali slag wastewater enters the pH adjustment tank, and at the same time, sulfuric acid is added to the adjustment tank to adjust the pH value of the wastewater to 7 and stand for 8 hours until the demulsification and stratification of the wastewater occurs, and the upper layer of crude phenol, cyclo Alkanoic acid and oil, the lower layer of wastewater enters the electric floating device;

[0036] 2) In the electric floatation equipment, the wastewater is pre-oxidized to break the gel and demulsify under the action of electricity, and the organic sulfur in the wastewater is converted into inorganic sulfur, and the phenol molecules are degraded and decolorized at the ...

Embodiment 2

[0041] Utilize the above-mentioned treatment system and method of the present invention to process certain ethylene high salinity slag waste water 1.0m 3 / h, of which, COD in wastewater is 25000mg / L, sulfide is 10000mg / L, and volatile phenol is 8000mg / L. The entire processing process is similar to Embodiment 1, and will not be repeated here. After the above-mentioned treatment of ethylene high-salt-alkali residue wastewater, the effluent has COD550mg / L, BOD200mg / L, B / C=0.36, sulfide 12mg / L, and volatile phenol 18mg / L. The effluent is clear, has good biodegradability, and has no Notable smell.

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Abstract

The invention discloses a treatment system for high-salinity spent caustic wastewater. The treatment system comprises a pH adjusting unit, an electric flotation unit, an electric flocculation unit andan electrocatalytic oxidation unit which are arranged in sequence, wherein the electric flotation unit comprises an electric flotation device; the electric flocculation unit comprises electric flocculation equipment and solid-liquid separation equipment; and the electrocatalytic oxidation unit comprises electrocatalytic oxidation equipment. In addition, the invention also discloses a treatment method for the high-salinity spent caustic wastewater. The method comprises the following steps: 1) regulating the pH value of the high-salinity spent caustic wastewater to 5-8, and carrying out standing for layering; 2) carrying out electric flotation treatment on the lower-layer wastewater obtained in the step 1); 3) performing electric flocculation treatment on the effluent of electric flotation,and performing solid-liquid separation on the effluent generated by the electric flocculation treatment; and 4) performing electrocatalytic oxidation treatment on the liquid-phase effluent obtained in the step 3). By utilizing the treatment system and method disclosed by the invention, high-efficiency, economic and environment-friendly treatment of the high-salinity spent caustic wastewater an berealized at normal temperature and normal pressure.

Description

technical field [0001] The invention relates to a treatment system and method for high-salt-alkali slag wastewater, in particular to an electrochemical treatment technology for phenol and sulfide in high-salt-alkali slag wastewater, and belongs to the technical field of sewage treatment in the petrochemical industry. Background technique [0002] In the process of oil refining or ethylene production, in order to prevent the sulfur content, corrosion, acidity and other indicators in the finished oil from exceeding the standard, it is usually necessary to use alkali washing and refining, that is, the sodium hydroxide solution is used to react with the acidic substances in the oil to form an insoluble oil. The salts of the product are then discharged in the form of alkali residue. [0003] Alkali slag wastewater is high concentration, high toxicity, refractory, deep color, smelly, strong corrosive organic wastewater, containing high concentrations of sulfides, mercaptans, sulfi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F101/10C02F101/30C02F101/34C02F103/36
CPCC02F1/463C02F1/465C02F1/4672C02F1/66C02F9/00C02F2101/101C02F2101/30C02F2101/345C02F2103/365C02F2209/08
Inventor 顿继田苗远
Owner BEIJING DILI WEIYE TECH DEV
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