Method for controlling trichloronitromethane formation potential through catalyzing ozone oxidation

An ozone oxidation and generation potential technology, applied in chemical instruments and methods, oxidized water/sewage treatment, physical/chemical process catalysts, etc., can solve the problems of increased TCNM generation potential, improper use of catalysts, etc.

Active Publication Date: 2017-05-03
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The oxidation of ozone alone can reduce the formation potential of THMs and HAAs. Previous researchers found that the addition of catalysts can only further promote the efficiency of ozone oxidation of THMs and HAAs precursors; while TCNM needs to be controlled by catalysts, it is not simply to strengthen the oxidation of ozone , improper use of some catalysts may even cause a substantial increase in the formation potential of TCNM

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  • Method for controlling trichloronitromethane formation potential through catalyzing ozone oxidation
  • Method for controlling trichloronitromethane formation potential through catalyzing ozone oxidation
  • Method for controlling trichloronitromethane formation potential through catalyzing ozone oxidation

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specific Embodiment approach

[0015] The technical scheme of the invention includes the preparation of a modified nanometer metal oxide catalyst and a method for using the catalyst to suppress the formation potential of highly toxic nitrogen-containing disinfection by-product TCNM in the ozone oxidation process of nitrogen-containing water. The specific implementation is as follows:

specific Embodiment approach 1

[0016] Specific embodiment one: the preparation method of the nano-scale bimetallic doped titanium dioxide catalyst in the present invention is as follows, tert-butyl titanate is added dropwise in absolute ethanol and accompanied by continuous magnetic stirring; Add cobalt nitrate and zinc sulfate, then drop concentrated hydrochloric acid, continue to maintain magnetic stirring for 25-35 minutes, add a certain volume of distilled water, and age for 1-3 hours to obtain a gel. Among them, the ratio of butyl titanate, absolute ethanol, hydrochloric acid and distilled water is about 1:4:0.1~0.2:0.8; the ratio of Ti element in tert-butyl titanate to cobalt ion in cobalt nitrate is 15~30:1 , The ratio of Ti element in tert-butyl titanate to zinc ion in zinc sulfate is 25-45:1. Put the gel into an oven, first dry it in an environment of 60-70°C for 5-6 hours, then raise the temperature to 75-90°C and continue drying until the moisture in the gel is completely dry; put the obtained so...

specific Embodiment approach 2

[0017] Specific implementation mode two: Utilize the aqueous solution of amino acid precursors prepared by pure water, pass through the nano-scale Zn-Co-TiO inside 2Ozone contact and catalytic oxidation are carried out in the airtight container of the catalyst at the same time. The ozone enters from the upper part of the container, and a magnetic stirring device is installed at the bottom of the container. During the reaction process, the solution is continuously stirred. The contact time is 6-12 minutes; the tail gas is absorbed with potassium iodide solution. See attached for specific process figure 1 .

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Abstract

The invention discloses a method for controlling the formation potential of a nitrogenous disinfection byproduct, trichloronitromethane (TCNM), through catalyzing ozone oxidation, particularly relates to a method for controlling the formation potential of TCNM in a nitrogenous water body during chlorine disinfection after ozone oxidation through introducing a nanoscale Zn-Co-TiO2 bimetal doped catalyst, and aims to utilize the specific catalytic action of the Zn-Co-TiO2 catalyst to intervene the ozone oxidation process and control generation of TCNM precursors, so as to decrease the generation amount of TCNM in the nitrogenous water body during follow-up chlorine disinfection and avoid the harmful effect that the TCNM content is high when the highly nitrogenous water body is subjected to advanced treatment through ozone oxidation. The method is characterized in that filter water obtained after conventional treatment of an amino acid aqueous solution prepared through pure water or actual surface water directly enters an airtight reactor filled with the catalyst, and ozone is continuously introduced for catalytic oxidation under magnetic stirring. When the method is utilized to treat the actual nitrogenous water body, the generation amount of a carbonbearing disinfection byproduct, trihalomethane, can be synchronously controlled, the removal capability of ozone for TOC is improved, and safety reliability of outlet drinking water is strengthened.

Description

technical field [0001] The invention relates to a method for controlling the generation potential of nitrogen-containing disinfection by-product chloropicrin, in particular to a method using nano-scale bimetallic doped titanium dioxide (TiO 2 ) as a catalyst to control the formation potential of trichloropicrin, a highly toxic nitrogen-containing disinfection by-product, during the ozonation process of nitrogen-containing water bodies. Background technique [0002] At present, the pollution of water sources is becoming more and more serious, and some waterworks have begun to use ozonation as a pretreatment or advanced treatment process to improve the quality of discharged water. Ozone oxidation can degrade some organic pollutants in water, and can reduce the formation potential of disinfection by-products such as THMs, HAAs, and NDMA to a certain extent; however, studies have found that ozone oxidation can lead to halogenation of nitrogen-containing disinfection by-products ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72B01J23/80C02F101/38
Inventor 鲁金凤于兴玥王琼冯瑛陈权石紫龙杜智
Owner NANKAI UNIV
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