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A treatment method and treatment device for high-salt wastewater produced by crude glycerin purification

A high-salt wastewater and treatment method technology, applied in water/sewage treatment, multi-stage water/sewage treatment, oxidized water/sewage treatment, etc., can solve problems such as difficulty in meeting discharge requirements, inability to oxidize and degrade organic matter, and inorganic salt pollution , to achieve the effect of low processing cost, realizing recycling and improving quality

Active Publication Date: 2020-10-16
山东建龙新材料科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the treatment method of high-salt wastewater produced by the purification of crude glycerin, since the organic matter cannot be completely oxidized and degraded, the separated water often contains a certain amount of organic matter, which is difficult to meet the discharge requirements, and the separated salt is also doped with a certain amount of Organic matter, leading to contamination of the separated inorganic salts

Method used

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  • A treatment method and treatment device for high-salt wastewater produced by crude glycerin purification
  • A treatment method and treatment device for high-salt wastewater produced by crude glycerin purification
  • A treatment method and treatment device for high-salt wastewater produced by crude glycerin purification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Add the high-salt wastewater produced by the purification of crude glycerin into the wastewater storage tank, add the catalytic oxidation aid anhydrous copper chloride and stir evenly, then preheat, and after preheating, enter the V 2 o 5 / SiO 2 In the oxidation reactor, it reacts with the oxidant, and controls the temperature, pressure, flow rate and residence time of the reaction; after the reaction is completed, samples are taken at the outlet of the oxidation reactor for analysis, and then the treated organic wastewater enters the flash device, and the temperature is lowered. The solid salt is separated by centrifugation through the desalination filter, and the concentrated liquid after centrifugation is returned to the filter device, then enters the preheating device, and is applied to the process to realize the recycling of catalytic oxidation additives. The treated organic wastewater was measured for COD and calculated for its removal rate, and analyzed after dr...

Embodiment 2

[0044] The processing is as in Example 1.

[0045] The process parameters are:

[0046] (1) NaCl content is 17.0wt.% in the high-salt wastewater produced by crude glycerin purification, and COD is 90000mg / L; After adding anhydrous copper chloride in the high-salt wastewater produced by crude glycerin purification, Cu 2+ The molar concentration in the high-salt wastewater produced by crude glycerin purification is 0.4mmol / L; the preheating temperature is 150°C; the reaction temperature is 150°C, the reaction pressure is 5.0MPa, the residence time is 120min, and the wastewater flow rate is 8.3ml / min , the oxidant is air;

[0047] (2) After testing, the COD removal rate of the treated organic wastewater is 98.54%, and the recovery rate of NaCl is 99.4%. After the solid salt is dried, it is analyzed, and its quality index is: NaCl: 98.6wt.%; Cu 2+ : 1.9 μg / g; TOC: 9.9 μg / g.

Embodiment 3

[0049] The processing is as in Example 1.

[0050] The process parameters are:

[0051] (1) NaCl content is 18.0wt.% in the high-salt wastewater produced by crude glycerin purification, and COD is 80000mg / L; After adding anhydrous copper chloride in the high-salt wastewater produced by crude glycerin purification, Cu 2+ The molar concentration in the high-salt wastewater produced by crude glycerin purification is 0.4mmol / L; the preheating temperature is 250°C; the reaction temperature is 250°C, the reaction pressure is 10.0MPa, the residence time is 5min, and the wastewater flow rate is 200ml / min. The oxidizing agent is oxygen;

[0052] (2) After testing, the COD removal rate of the treated organic wastewater is 99.10%, and the recovery rate of NaCl is 99.1%. After the solid salt is dried, it is analyzed, and its quality index is: NaCl: 98.7wt.%; Cu 2+ : 1.9 μg / g; TOC: 9.4 μg / g.

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Abstract

The invention belongs to the technical field of treatment of organic wastewater and particularly relates to a treatment method and device for high-salinity wastewater produced by crude glycerol purification. According to the treatment method, a catalytic oxidation additive is mixed with the high-salinity wastewater produced by crude glycerol purification in advance, the wastewater is preheated, enters an oxidation reactor and is subjected to an oxidation reaction with an oxidizing agent, so that organic matter in the wastewater is oxidized into H2O and CO2, and a reaction solution after the reaction is subjected to flash evaporation, evaporation and concentration for desalination. The invention further provides the treatment device for the high-salinity wastewater produced by crude glycerol purification. Soluble copper salt is combined with V2O5 / SiO2, and synergy between the two substances is exerted fully, so that the organic matter in the wastewater is removed by rapid deep oxidation; content of COD in the organic wastewater is reduced greatly, water and solid salt can be separated effectively, content of the organic matter in the water and the solid salt is low, the separated water can be reused, and the solid salt can also serve as a byproduct for use.

Description

technical field [0001] The invention belongs to the technical field of organic wastewater treatment, and in particular relates to a treatment method and a treatment device for high-salt wastewater produced by crude glycerin purification. Background technique [0002] With the mass production of biodiesel, the production of its by-product crude glycerol has also increased rapidly. Crude glycerin contains a certain amount of sodium chloride, and sodium chloride will remain in the wastewater produced from the purification of crude glycerin, which will bring difficulties to the subsequent wastewater treatment. [0003] Chinese patent CN102503014A discloses a treatment method for salty glycerin wastewater. The patent uses n-butanol as an extractant. n-butanol can make organic matter and a small amount of salt enter the organic phase, and most of the salt remains in the water phase. Butanol and glycerin were separated by distillation, and the aqueous phase was crystallized to obt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F101/30
CPCC02F1/001C02F1/04C02F1/06C02F1/38C02F1/725C02F1/727C02F1/74C02F9/00C02F2101/30
Inventor 王景华张广俊崔洪友刘勤学杨明刚王勇张远
Owner 山东建龙新材料科技有限公司
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