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Method for removing phenylurea herbicide chlortoluron in water

A herbicide and water removal technology, which is applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of no continuous sterilization ability and microbial content recovery, and saves economic costs and time costs. Free radical consumption, simple and safe application

Pending Publication Date: 2021-11-26
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, UV disinfection is an instant disinfection technology and has no continuous sterilization ability. After the water body passes through the ultraviolet reactor for a period of time, the microbial content in the water will rebound, which is also one of the shortcomings of UV disinfection technology.

Method used

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  • Method for removing phenylurea herbicide chlortoluron in water
  • Method for removing phenylurea herbicide chlortoluron in water
  • Method for removing phenylurea herbicide chlortoluron in water

Examples

Experimental program
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Effect test

Embodiment 1

[0039] The initial concentration of chlorotoluron was prepared with ultrapure water as 8 μM, and the degradation experiments of chlorotoluron were carried out under the three processes respectively. The degradation experiment operation of chlorotoluron under the single persulfuric acid oxidation process is as follows: using NaOH and H at a concentration of 1M 2 SO 4 Adjust the initial pH of the chlorotoluron solution to 7, add peroxysulfate to the chlorotoluron solution to make the concentration reach 160 μM, and control the reaction temperature to 25°C; 2 SO 4 Adjust the initial pH of the chlorotoluron solution to 7, irradiate the chlorotoluron solution with ultraviolet light, and control the ultraviolet irradiation intensity to 2.43mW / cm 2 , the reaction temperature is controlled at 25°C; the degradation experiment operation of chlorotoluron under the UV / peroxymonosulfuric acid combined process is as follows: use 1M NaOH and H 2 SO 4 Adjust the initial pH of the chloroto...

Embodiment 2

[0042] A method for removing the phenylurea herbicide chlorotoluron in water by a combination process of ultraviolet / permonosulfate, comprising the following steps:

[0043] Use ultrapure water to prepare the initial concentration of chlortoluron as 8 μM, and use 1M NaOH and H 2 SO 4 Adjust the initial pH of the chlorotoluron solution to 7, add persulfate solution to the chlorotoluron solution, control the initial addition of monosulfuric acid so that the concentrations are 0, 40, 80, 160, 240 and 400 μM, and simultaneously carry out ultraviolet Irradiation, control the UV intensity to 2.43mW / cm 2 , after 300s of reaction, the removal rate of chlorotoluron is detailed in figure 2 .

[0044] From figure 2 It can be seen that increasing the dosage of peroxymonosulfate can accelerate the degradation rate of chlorotoluron. When the concentration of persulfate increased from 40 μM to 400 μM, the degradation rate of chlorotoluron increased from 83.1% to 100% after 300 seconds...

Embodiment 3

[0046] A method for removing the phenylurea herbicide chlorotoluron in water by a combination process of ultraviolet / permonosulfate, comprising the following steps:

[0047] Use ultrapure water to configure the initial concentration of chlortoluron to be 8 μM, and use 1M NaOH and H 2 SO 4 Adjust the initial pH of the chlorotoluron solution to 7, add peroxymonosulfate solution to the chlorotoluron solution to make the concentration 160 μM, and carry out ultraviolet irradiation at the same time, and control the ultraviolet intensity to be 2.43, 4.94, 7.34 and 9.79mW / cm respectively 2 , at a temperature of 25°C, the basic degradation times of chlorotoluron are 120s, 150s, 180s, and 300s, respectively.

[0048] From image 3 It can be seen that with the gradual increase of the intensity of ultraviolet light, the degradation rate of chlorotoluron gradually increased. When the intensity of ultraviolet light increases, the photon energy in the solution increases, and the SO produc...

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Abstract

The invention relates to a method for removing a phenylurea herbicide chlortoluron in water, which is characterized in that PMS is used as an oxidant, and the phenylurea herbicide chlortoluron in the water is oxidized and degraded through ultraviolet radiation. Compared with the prior art, the method provided by the invention can realize thorough mineralization of a considerable part of refractory trace organic pollutants, basically has no catalyst residue and no toxic and harmful by-product generation, has strong adaptability to different matrix water bodies, basically does not need to adjust the pH value of the water to be treated, and has the advantages of wide pH range, convenient operation and low operation cost.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a method for removing chlorotoluron, a phenylurea herbicide, in water. Background technique [0002] The global annual use of pesticides is about 2 million tons. These pesticides mainly enter surface water through surface runoff, drainage and media transfer, and are often used as pollutants detected in surface water and drinking water. Due to the biological Cumulative, acute and chronic health risks to the human body have attracted much attention. In a survey of 141 pesticides and transformation products in Canadian surface water and groundwater in 2011 by Environment Canada, a total of 102 were detected nationwide), phenylurea herbicides Chlorinated phenylurea herbicides are a class of the most popular and widely used pesticides, and the high physical and chemical stability of chlorinated phenylurea herbicides leads to their persistence in the environment and slow biodeg...

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F1/32C02F101/30
CPCC02F1/32C02F1/722C02F2101/306C02F2305/02C02F2305/023C02F2303/04
Inventor 赖璠田富箱母兴艳叶璟叶文凯
Owner SHANGHAI INST OF TECH
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