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A method for recovering waste salt in saline wastewater in the production of tebuconazole

A technology of salty wastewater and recovery method, applied in chemical instruments and methods, neutralized water/sewage treatment, alkali metal sulfite/sulfate purification, etc. Potassium recovery rate is not ideal and other problems, to achieve the effect of improving the removal rate and reducing the amount of slag produced by iron sludge

Active Publication Date: 2022-04-15
南京华工创新环境研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems in the prior art that potassium sulfate in tebuconazole production wastewater is difficult to handle, and the recovered product quality is not high, and the recovery rate of potassium sulfate is not ideal enough, the invention provides a kind of waste salt in the saline wastewater in the production of tebuconazole recycling method

Method used

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  • A method for recovering waste salt in saline wastewater in the production of tebuconazole
  • A method for recovering waste salt in saline wastewater in the production of tebuconazole

Examples

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Effect test

Embodiment 1

[0035] In this embodiment, the waste salt in the saline wastewater in the production of tebuconazole is recovered, including the following steps:

[0036] Step 1: using a sulfuric acid solution with a mass concentration of 98% to adjust the pH value of the saline wastewater in the production of tebuconazole to 3;

[0037] Wherein, the dosage of described sulfuric acid solution is to add 100g per ton of waste water:

[0038] Step 2: Pass the waste water after pH adjustment into such as figure 1 In the shown double oxidation reactor coupled with electrocatalytic Fenton oxidation and electrochemical oxidation, the electrocatalytic Fenton oxidation current is set to 1A, the operating voltage is 2V, the operating temperature is 20°C, and the operating voltage of the electrochemical oxidation reaction is 3V , the current is 1A, the operating temperature is 20°C, the circulation pump is turned on for 24 hours, and a certain amount of H with a mass concentration of 30% is added durin...

Embodiment 2

[0043] In this embodiment, the waste salt in the saline wastewater in the production of tebuconazole is recovered, including the following steps:

[0044] Step 1: using a sulfuric acid solution with a mass concentration of 98% to adjust the pH value of the saline wastewater in the production of tebuconazole to 3.5;

[0045] Wherein, the dosage of described sulfuric acid solution is to add 90g per ton of waste water:

[0046] Step 2: Pass the waste water after pH adjustment into such as figure 1 In the shown double oxidation reactor coupled with electrocatalytic Fenton oxidation and electrochemical oxidation, the electrocatalytic Fenton oxidation current is set to 1.2A, the operating voltage is 2.5V, and the operating temperature is 25°C. The operating voltage of the electrochemical oxidation reaction is The current is 3.5V, the current is 1.1A, the operating temperature is 25°C, and the circulation pump is turned on to react for 24 hours. During the reaction, a certain amount...

Embodiment 3

[0051] In this embodiment, the waste salt in the saline wastewater in the production of tebuconazole is recovered, including the following steps:

[0052] Step 1: using a sulfuric acid solution with a mass concentration of 98% to adjust the pH value of the saline wastewater in the production of tebuconazole to 3.8; wherein, the dosage of the sulfuric acid solution is 88g per ton of wastewater:

[0053] Step 2: Pass the waste water after pH adjustment into such as figure 1 In the shown double oxidation reactor coupled with electrocatalytic Fenton oxidation and electrochemical oxidation, the electrocatalytic Fenton oxidation current is set to 1.5A, the operating voltage is 2.8V, and the operating temperature is 30°C. The operating voltage of the electrochemical oxidation reaction is The current is 3.8V, the current is 1.2A, the operating temperature is 30°C, the circulation pump is turned on for 24 hours, and a certain amount of H with a mass concentration of 30% is added during...

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Abstract

The invention discloses a method for recovering waste salt from salt-containing wastewater in the production of tebuconazole. It is specifically implemented according to the following steps: adjusting the pH of the salt-containing wastewater to 3-4; passing the wastewater into electro-Fenton catalytic oxidation and electrochemical processes. The reaction is carried out for 24 hours in the oxidation-coupled double oxidation reactor; after the reaction is completed, the pH of the wastewater is adjusted back to 7-8; the double oxidation effluent is crystallized by multi-effect evaporation to obtain high-purity potassium sulfate solid salt; the potassium content of the potassium sulfate solid salt reaches Requirements for qualified potassium sulfate products for agricultural use (GB20406-2006). The present invention uses tebuconazole synthetic wastewater as raw material, turning waste into treasure, which is beneficial to environmental protection and comprehensive utilization. The process cost of the present invention is low, the recovered potassium sulfate is of high quality, has good crystal size, and the recovery rate can reach 90%. Above, the potassium content of the product can reach more than 45% (in K 2 O meter).

Description

technical field [0001] The invention belongs to the technical field of energy saving and emission reduction, and in particular relates to a method for recovering waste salt in saline wastewater in the production of tebuconazole. Background technique [0002] During the production of tebuconazole, a large amount of wastewater will be produced. The wastewater has complex components, mainly containing organic matter, and also contains high concentrations of potassium sulfate. Potassium sulfate has high economic value, and the presence of high concentrations of potassium sulfate will greatly interfere with the removal of organic matter in saline wastewater, because most microorganisms that deal with organic pollutants are difficult to tolerate high concentrations of Inorganic salts, therefore, the inorganic salts in the wastewater must be recovered before using biological methods to treat organic wastewater. [0003] Electrochemical oxidation, as a promising treatment technolog...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C01D5/16C02F103/36
CPCC02F9/00C01D5/16C02F1/66C02F1/4672C02F1/725C02F1/722C02F1/04C02F2103/36C02F2209/08C02F2209/02C02F2209/06C02F2301/08C02F2201/46135C02F2201/4614C02F2305/026
Inventor 刘润韩卫清殷许张磊袁震左武杰
Owner 南京华工创新环境研究院有限公司
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