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Research on the Influence of Catalytic Ozonation on Bromate Formation

Author: ChenWeiPeng
Tutor: MaJun
School: Harbin Institute of Technology
Course: Municipal Engineering
Keywords: Bromate Cerium oxide Catalytic ozonation HPLC-UV
CLC: TU991.25
Type: Master's thesis
Year: 2007
Downloads: 366
Quote: 8
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Abstract


Ozonation treatment as an effective means of being more widely used in water treatment. However, there are some ozone alone process deficiencies, such as refractory organics removal capacity is insufficient, water containing bromide ions generated carcinogen bromate. Metal catalytic ozonation compared with ozonation alone has many advantages, and easy to replace in the process, ozone alone. Learn metal catalytic ozonation process bromate formation law for the practical application of catalytic ozonation and ozone oxidation process control bromate has important significance. Thesis carried out in the following aspects: 1. Water several inorganic bromine (bromide, hypobromite and bromate) determination; 2. Several different types of metal oxide catalytic ozonation bromate Formation; 3 different water conditions, cerium oxide catalytic ozonation bromate generates control effect. Establish a HPLC-UV determination of bromate, bromide and hypobromite method. Bromate and bromide ions in the strongly acidic reaction conditions can be added to water with a phenol reaction of 4 - bromo-phenol, the reaction in a range of 4 - bromo-phenol and bromate, bromide and hypobromite between a good linear relationship. PH control solution derived by the method of hypobromous bromate and bromide ions on the determination of interference. Identified bromate and bromide ions and phenol reaction stoichiometry. Magnesium oxide, iron oxide, cerium oxide catalytic ozonation impact on bromate has generated significant difference. In pure water, magnesium oxide, iron oxide is added to improve the ozone oxidation of the amount of bromate, and the cerium oxide is added to a significant reduction in the ozone oxidation of the amount of bromate; in HOA solution, the presence of organic matter ozonation Oxidation of bromate generate influence weakened, ceria's ability to control bromate generation is suppressed. Discusses the cerium oxide dosage, bromide ion concentration, pH, reaction temperature on the catalytic ozonation to reduce the impact generated bromate and cerium oxide as a catalyst to reduce bromate generated reason. Cerium oxide by inhibiting the oxidation of ozone on hypobromous reduce bromate formation. Cerium oxide surface Ce (IV) and sulfate complex will weaken the control of bromate catalytic ozonation generation capacity, so this effect of cerium oxide and surface Ce (IV) related. Experimental results show that the dosage of cerium oxide from 0mg / L to 250mg / L, to reduce the generation amount of bromate 85.1%; bromide ion concentration of 0.5,1.0,2.0 mg / L, the catalytic ozonation can reduce 69.2%, respectively, 83.5 % and 15.2% of the formation of bromate, bromide ion concentration had no significant effect on the catalytic law; pH value rises will reduce the catalytic effect; reaction temperature between 5 ℃ ~ 25 ℃, the catalytic ozonation can reduced by 43% ~ 59% of bromate formation (bromide ion concentration 1.5mg / L), the reaction temperature does not affect the catalytic effect.

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CLC: > Industrial Technology > Building Science > Municipal Engineering > Water supply project ( on the Water Works ) > Clean Water ( water treatment ) > Disinfection of drinking water,water biocontrol
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