Pre-treatment process of imidacloprid wastewater

A technology of imidacloprid and pretreatment, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., which can solve the problem of large dilution ratio of biochemical influent water, high requirements for reaction conditions and high treatment costs. problems, to achieve the effect of saving dosage, good effect and large contact area

Inactive Publication Date: 2013-06-12
NANJING UNIV OF TECH
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  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the disadvantages of the existing imidacloprid pretreatment technology, such as high treatment cost, high requirements on reaction conditions, large dilution factor of biochemical influent water, and difficulty in reaching the standard for treatment, and provide a treatment with high efficiency, low cost and simple equipment requirements The pretreatment process of imidacloprid wastewater

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  • Pre-treatment process of imidacloprid wastewater

Examples

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Embodiment 1

[0026] Wastewater from imidacloprid production of a pesticide manufacturer in Yancheng:

[0027] (1) The imidacloprid production wastewater is divided into three streams according to the production process, which are imidacloprid high phosphorus wastewater, imidacloprid high DMF wastewater, and imidacloprid other stream wastewater. First add calcium carbonate 90g / L to the high phosphorus wastewater. Then add milk of lime to adjust the pH to 7, after static precipitation, take the supernatant. Use hydrochloric acid to adjust the pH of the waste water to 5, adjust the vacuum degree, and carry out distillation at a pressure of 0.03 MPa to obtain the distilled liquid. At this time, COD dropped from 107000mg / L of influent to 24440mg / L.

[0028] (2) Use milk of lime to adjust the pH of high DMF wastewater to 11. After alkaline hydrolysis in a 60-degree water bath for 2 hours, the COD is from 54700mg / L to 33110mg / L.

[0029] (3) After mixing the wastewater treated in (1) and (2) w...

Embodiment 2

[0034] Wastewater from imidacloprid production of a pesticide manufacturer in Yangzhou:

[0035] (1) Divide imidacloprid production wastewater into three streams according to the production process, one stream is high-phosphorus wastewater, and 80 g / L of calcium carbonate is added to the high-phosphorus wastewater first. Then add milk of lime to adjust the pH to 8, after static precipitation, take the supernatant. Use hydrochloric acid to adjust the pH of the waste water to 6, adjust the vacuum degree, and carry out distillation at a vacuum degree of 0.04MPa to obtain the distilled liquid. At this time, COD dropped from 90000mg / L of influent to 16440mg / L.

[0036] (2) Use stone caustic soda to adjust the pH of high-DMF wastewater to 12, and after 3.5 hours of alkaline hydrolysis in a 70-degree water bath, the COD of the influent is from 36700 mg / L to 18240 mg / L.

[0037] (3) After mixing the wastewater treated in (1) and (2) with the remaining wastewater, adjust the pH to 2 ...

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Abstract

The invention relates to a pre-treatment process of imidacloprid wastewater. The pre-treatment process is characterized by being used for collecting wastewater generated in the production process of the imidacloprid pesticide by classifying, and comprising the following steps of: firstly treating according to quality and then mixing the wastewater to carry out oxidation treatment on account of the characteristics of blasts of wastewater. Due to the pre-treatment process of imidacloprid wastewater, the classified collection of the imidacloprid wastewater, quality-distinguishing efficient pre-treatment, strong pertinence and good treatment effect can be realized, the concentration of degradation-resistant organic matters is greatly reduced, the biodegradability of the wastewater is improved and the economical efficiency is improved; the pre-treatment process has the advantages of being wild in reaction condition, simple to operate, good in treatment effect and low in operation cost; and the pre-treatment process of imidacloprid wastewater disclosed by the invention can be used for overcoming the defects of high reaction condition requirement, unstable water quality and the need of great amount of water for diluting after pre-treating of the existing pre-treatment method of the imidacloprid wastewater.

Description

technical field [0001] The invention relates to a pretreatment process for imidacloprid wastewater, in particular to a pretreatment process for quality classification of imidacloprid wastewater. Background technique [0002] Imidacloprid is a new type of nitromethylene systemic insecticide. As a new generation pesticide product, it has a good market prospect. However, the treatment of pesticide production wastewater has always been a major problem for enterprises. Due to the complex water quality of wastewater, high concentration of organic matter, many refractory organic matter, high toxicity, and poor biodegradability, traditional methods of treatment cannot meet the discharge standards, causing adverse effects on the environment. [0003] The treatment of organic pesticide wastewater is difficult and costly, and it has been difficult to meet the national discharge standards, which is the bottleneck restricting the rapid development of the pesticide industry. There are m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 徐炎华刘志英王超民陆雪梅
Owner NANJING UNIV OF TECH
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