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A pesticide wastewater and treatment method technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of complex process operation and high treatment cost, and achieve low consumption, The effect of low operating cost and simple process
Active Publication Date: 2011-05-04
JIANGSU LASON CHEM ENVIRONMENTAL PROTECTION
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This method is only for the treatment of wastewater in the condensation section in the production process of imidacloprid with relatively few types of pollutants, and the pretreatment adopts resin adsorption and distillation process, the treatment cost is high, and the process operation is complicated
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Embodiment 1
[0020] Example 1: The comprehensive wastewater produced by imidacloprid pesticide in a pesticide factory is treated by the method of the present invention: chemical phosphorus removal, Fe-C micro-electrolysis, Fenton, catalytic oxidation and A / O+biological aerated filter method. The specific steps are as follows.
[0021] 1) Chemical phosphorus removal: Add milk of lime to the comprehensive wastewater of imidacloprid pesticide production to adjust the pH to 10.0 for chemical phosphorus removal, and at the same time add PAM coagulant for precipitation and separation.
[0022] 2) Fe-C micro-electrolysis: After chemical phosphorus removal, the wastewater is added acid to adjust the pH to 2.0. After entering the Fe-C micro-electrolysis cell for 6 hours of reaction, add alkali to neutralize and add flocculant to coagulate and precipitate.
[0023] 3) Fenton reaction: Fe-C micro-electrolytic coagulation and precipitation effluent, dilute with water according to 1:2, adjust pH=3.0, ad...
Embodiment 2
[0028] Example 2: A pesticide factory imidacloprid pesticide production comprehensive wastewater, using the method of the present invention: chemical phosphorus removal, Fe-C micro-electrolysis, Fenton, catalytic oxidation and A / O + biological contact oxidation biochemical treatment, the specific steps are as follows.
[0029] 1) Chemical phosphorus removal: In the comprehensive wastewater produced by imidacloprid pesticides, milk of lime is added to adjust the pH to 11.0 for chemical phosphorus removal, and PAM coagulant is added at the same time for precipitation and separation.
[0030] 2) Fe-C micro-electrolysis: After chemical phosphorus removal, the wastewater is adjusted to pH 3.0, and enters the Fe-C micro-electrolysis cell. After 8 hours of reaction, it is neutralized and coagulated to precipitate.
[0031] 3) Fenton reaction: Fe-C micro-electrolytic coagulation and precipitation effluent, dilute with water according to 1:3, adjust pH=3.0, add H concentration of 30wt% ...
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Abstract
The invention relates to improvement on an imidacloprid pesticide wastewater treatment method. The imidacloprid pesticide wastewater treatment method is characterized by comprising the following steps of: performing physical and chemical pretreatment, namely performing chemical phosphorus removal and ferrum-carbon (Fe-C) micro-electrolysis sequentially and then performing Fenton oxidation and catalytic oxidation respectively; and performing biochemical treatment, namely performing aerobic biochemical treatment in the presence of salt-tolerant aerobic bacteria. By the imidacloprid pesticide wastewater treatment method, the total physical and chemical treatment effect is greatly improved; physical and chemical pretreatment can be performed at normal temperature and normal pressure; organic matters difficult to biochemically degrade is degraded and the biochemical property of the wastewater is improved under the condition of low cost; the dilution factor of the wastewater is greatly reduced; and the using amount of diluting water is reduced by 50 to 80 percent, so that the treatment is more economic. The imidacloprid pesticide wastewater treatment method is simple in pretreatment method, mild and stable in process reaction condition, simple in operation (for example, the catalytic oxidation can be performed at normal temperature and normal pressure and a catalyst can be recycled), low in operating cost, good in treatment effect, low in the using amount of the diluting water during the subsequent biochemical treatment and low in total treatment cost, and the water from the biochemical treatment can reach a national level 1 of discharge standard.
Description
technical field [0001] The invention relates to a method for treating imidacloprid pesticide wastewater, in particular to a method for treating imidacloprid pesticide wastewater with simple treatment method and less water consumption for dilution. Background technique [0002] Imidacloprid is a high-efficiency, low-toxic, broad-spectrum biomimetic insecticide. During its production, a large amount of wastewater is produced. This type of wastewater mainly contains phosphate, imidazolidine, acrylonitrile, toluene, DMF and a small amount of 2-chloro Pollutants such as -5-chloromethylpyridine have the characteristics of complex composition, high concentration of organic matter (COD is usually as high as tens of thousands of mg / l), refractory biodegradation, and high salt content, making it difficult to treat. [0003] A large number of experimental studies have been carried out for the treatment of imidacloprid production wastewater. For example: Zhao Binxia et al. (2006.4 "Env...
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