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Method for predicting oxidative degradation for removing dicamba in organic wastewaterofozone/hydrogen peroxide

A technology for oxidative degradation of organic wastewater, applied in chemical instruments and methods, water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problem of the inability to establish a kinetic model of dicamba organic wastewater oxidative degradation and the inability to detect free radical degradation intermediate products etc.

Active Publication Date: 2016-12-07
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a method for predicting the oxidative degradation of dicamba in organic waste water by ozone / hydrogen peroxide, so as to solve the problem of undetectable free radical degradation intermediates in the liquid phase reaction of ozone / hydrogen peroxide oxidation of dicamba, thus making it impossible to establish suitable industrial applications Concise Ozone / H2O2 Removal of Dicamba in Organic Wastewater Oxidative Degradation Kinetic Model Issues

Method used

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  • Method for predicting oxidative degradation for removing dicamba in organic wastewaterofozone/hydrogen peroxide
  • Method for predicting oxidative degradation for removing dicamba in organic wastewaterofozone/hydrogen peroxide
  • Method for predicting oxidative degradation for removing dicamba in organic wastewaterofozone/hydrogen peroxide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] a) The reaction of ozone / hydrogen peroxide and dicamba starts with the chain reaction of producing hydroxyl radicals, including:

[0023] (1) Chain initiation reaction: ozone and OH in water - and the HO provided by hydrogen peroxide 2 - The product is O 3 - ·;

[0024]

[0025] (2) chain transfer reaction:

[0026] o 3 - After a series of chain transfer reactions, hydroxyl radicals are finally generated;

[0027]

[0028]

[0029]

[0030] (3) Chain termination reaction:

[0031] The generated hydroxyl radicals react with themselves, ozone and ions in solution;

[0032]

[0033]

[0034]

[0035]

[0036]

[0037] b) Reaction of dicamba with free radicals:

[0038] The reaction process of dicamba and free radicals produces intermediate products that eventually mineralize into carbon dioxide and water

[0039] HO·+Dicamba→Intermediate 1→Intermediate 2→…Intermediate n→CO 2 +H 2 o

[0040] c) Reaction of dicamba with ozone:

[004...

Embodiment 2

[0079] 1. 0.65mol / L ozone saturated solution configuration:

[0080] Put the aerator head of Akcome Y-45 ozone generator into 100ml deionized water for 30 minutes. Obtain 0.65mol / L ozone saturated solution, quickly transfer to a 50ml volumetric flask, and refrigerate at 5°C. Dilute with deionized water to obtain 0.35mM, 0.50mM, 0.065mM ozone solutions respectively.

[0081] 2. Take 1ml of ozone solution (three concentrations, three times respectively) and 1ml of 30% hydrogen peroxide solution in volume concentration and add it to 100ml of dicamba simulated wastewater prepared with deionized water (dosing amount of dicamba is 0.0221g). Sampling and detection by the method of Example 1; finally, the sample is subjected to quantitative analysis.

[0082] The experimental observation value is: hydrogen peroxide concentration, ozone concentration and hydroxyl radical concentration, the correlation coefficient of experimental value and theoretical value (seeing table 2) is all gre...

Embodiment 3

[0095] The deionized water in Example 2 was changed to river water, and the river water was collected according to the national standard: [JGJ63-2006]. The on-site measurement pH was 6.9. The Qiantang River water was sampled at a depth of 3m in the center of the river, and the shelf life was 7 days. Water quality: chloride ion: 2mg / L, iron ion: 0.05mg / L, carbonate: 40mg / L, DOC: 0.7mg / L. Other operations are the same as in Example 2, with natural water as the background, as a verification of the model, as a result, dicamba concentration, hydrogen peroxide concentration, ozone concentration and hydroxyl radical concentration, the correlation coefficients of experimental values ​​and theoretical values ​​are all greater than 0.95, ozone, hydrogen peroxide, The experimental value of hydroxyl radical concentration is close to the theoretical value, and the established kinetic model is reliable.

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Abstract

The invention discloses a methodfor predicting oxidative degradation for removing dicamba in organic wastewaterofozone / hydrogen peroxide.The method includes the following steps that step 1, adynamical modelfor oxidative degradation is established, and the dynamical model is established according to free radicalchain reaction mechanism of ozone and hydrogen peroxide and dicamba containing organic wastewater; step 2, the efficiency of degrading the dicamba in the organic wastewater of the ozone / hydrogen peroxide is predicted according to the model in the step 1; step 3, degradation is executed according to results in the steps 1 and 2, and the degradation is achieved by mixing the ozone and hydrogen peroxide and the dicamba containing organic wastewater and performing degradation reaction at room temperature, wherein the ozone concentration in the mixed liquid is 0.001-1 mM, and the hydrogen peroxide concentration is 0.001-1 mM. The method can simulate the dicamba removal situation by establishing the model, and the cost is saved.

Description

(1) Technical field [0001] The invention relates to a method for predicting the degradation of dicamba, in particular to a method for removing oxidative degradation of dicamba in organic wastewater by ozone / hydrogen peroxide. (2) Background technology [0002] At present, a large amount of industrial wastewater produced in chemical, dyestuff, pharmaceutical and other industries does not meet the discharge standards stipulated by the state, and is likely to cause secondary pollution; these wastewaters are characterized by high concentration, high toxicity, and poor biodegradability. It is difficult to achieve the ideal removal effect by this method, which has attracted widespread attention. The benignity and potential applicability of wastewater oxidation treatment with ozone and hydrogen peroxide have attracted more and more attention. This technology is easy to produce extremely strong oxidizing hydroxyl radicals, which react with organic substances such as substitution, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00C02F1/72C02F1/78
CPCC02F1/722C02F1/78G16C10/00
Inventor 戴启洲陈建孟汪皓
Owner ZHEJIANG UNIV OF TECH
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