Method for disposing cymoxanil pesticide wastewater
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A technology of pesticide wastewater and treatment method, which is applied in water/sewage treatment, neutralized water/sewage treatment, water/sewage multi-stage treatment, etc. Biodegradability, the effect of speeding up the reaction rate
Inactive Publication Date: 2019-07-30
QUANZHOU INST FOR ENVIRONMENTAL PROTECTION IND NANJING UNIV
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The salt obtained in this patent is still a mixed salt and cannot be directly utilized as a resource
The wastewater treatment methods that have been published in the prior art are various, but for the characteristics of extremely high COD value and high salt concentration in cymoxanil wastewater, how to develop a method that enables the wastewater to meet the discharge requirements and has a high impact on salt resources? Recycling has become a technical problem to be solved for cymoxanil wastewater
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Embodiment 1
[0027] Such as figure 1 As shown, Embodiment 1 of the present invention discloses a treatment method of cymoxanil pesticide wastewater, comprising the following steps in sequence:
[0028] 1) Transport the cymoxanil wastewater to the wastewater reactor, and use solid sodium hydroxide to adjust the alkalinity of the wastewater so that the pH is 10;
[0029] 2) After alkali adjustment, powdered activated carbon is added to the wastewater, the amount of activated carbon added is: 0.03g / mL, stirred and mixed, stainless steel is used as the cathode, and graphite is used as the anode material to form a three-dimensional electric stage to perform electrocatalytic reaction on the wastewater , the reaction time is 3h; the electrocatalytic current is 1.5A, and the electrocatalytic voltage is 3.5V;
[0030] 3) After the electrolysis reaction is over, let it stand still and filter, after filtering, adjust the acidity of the solution with sulfuric acid to make the pH 3, add iron powder t...
Embodiment 2
[0036] Such as figure 1 As shown, the second embodiment of the present invention discloses a treatment method of cymoxanil pesticide wastewater, which comprises the following steps in sequence:
[0037]1) Transport the cymoxanil wastewater to the wastewater reactor, and use solid sodium hydroxide to adjust the alkalinity of the wastewater so that its pH is 9;
[0038] 2) After alkali adjustment, powdered activated carbon is added to the wastewater, the amount of activated carbon added is: 0.04g / mL, stirred and mixed, stainless steel is used as the cathode, and graphite is used as the anode material to form a three-dimensional electric stage to perform electrolytic catalytic reaction on the wastewater , the reaction time is 3.5h; the electrocatalytic current is 2A, and the electrocatalytic voltage is 4V;
[0039] 3) After the electrolysis reaction is over, let it stand still and filter, after filtering, adjust the acidity of the solution with sulfuric acid to make the pH 4, a...
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Abstract
The invention relates to the field of advanced treatment of wastewater and provides a method for disposing cymoxanil pesticide wastewater. The method comprises the following steps that 1, solid sodiumhydroxide is utilized to perform alkali adjustment treatment on the cymoxanil wastewater; 2, after alkali adjustment, powdered activated carbon is added into the wastewater, stainless steel is used as a cathode, and graphite is used as an anode material to form a three-dimensional electrode to carry out an electrolytic catalytic reaction on the wastewater; 3, after the electrolytic catalytic reaction is finished, standing and filtering are carried out, and the acidity of a solution is adjusted by sulfuric acid after filtration; 4, after completion of an enhanced Fenton reaction, iron powder is filtered and recovered first, the pH is adjusted to be 8-9, standing is carried out, a supernatant is taken and placed into a preheating system, and the wastewater is conveyed into an evaporator forevaporation; 5, fractions obtained during evaporation are diluted with effluent of an A/O biochemical system and then subjected to biochemical treatment, and the wastewater after A/O biochemical treatment directly enters a garden pipe network system; 6, a residual liquid after evaporation is centrifuged and dried to obtain a sodium chloride product, a sodium nitrite product and a sodium sulfate product; 7, the remaining residual liquid is burned at the high temperature, and residual heat is recovered.
Description
technical field [0001] The invention belongs to the pesticide wastewater treatment technology, in particular to a treatment method for cymoxanil pesticide wastewater. Background technique [0002] The development of modern agriculture promotes the increasing amount of pesticide wastewater produced. Pesticide wastewater contains a large amount of toxic and harmful substances, which are highly toxic to aquatic organisms. Direct discharge will not only lead to the death of aquatic organisms, but also further penetrate into groundwater and soil, posing a potential threat to human health. Therefore, pesticide wastewater Effective governance is crucial. [0003] Cymoxanil is a high-efficiency, low-toxic fungicide, which is effective against Peronospora fungi (Phytophthora, Peronospora, and Plasmodium). Cauliflower vegetables and tobacco etc. The production process of cymoxanil is complex, and the waste water contains many complex components, including chloroacetic acid, cyanoac...
Claims
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