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The Effect and Mechanism of Galvanized Pipe to Haloacetic Acids Transformation in Drinking Water

Author: WangZuo
Tutor: ZhuLiZhong
School: Zhejiang University
Course: Environmental Science
Keywords: Galvanized pipe Drinking water HAAs Transformation Mechanism
CLC: TU991.2
Type: Master's thesis
Year: 2010
Downloads: 60
Quote: 0
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Abstract


Will have a class on the human body has the effect of \Drinking water delivery , water distribution pipe wall will be adsorbed DBPs or in connection with the chemical reaction , the wall material affect the the DBPs transformation of one of the important factors . Water distribution pipes , in commenting on DBPs transformation based on the impact related research , galvanized pipe , haloacetic acids (HAAs) were representatives of the water distribution pipes pipe and DBPs the galvanized pipe HAAs transformation ; in investigate on the basis of the role and mechanism of the conversion of zinc , zinc hydroxide , zinc oxide , and other wall components of HAAs ; trying to provide a theoretical basis for the control and evaluation of the whole process of the DBPs health risk , to protect the safety of drinking water . The paper achieved valuable results : (1) due to wall adsorption and the dehalogenation reaction occurs , a significant reduction in the galvanized pipe HAAs total concentration . Within 24 h , the bromine-containing acid gradually debromination to form acetic acid containing chloroacetic failed dechlorination product . Bromine-containing acetic acid than the fast attenuation containing chloroacetic , and halogen atom-containing units in the molecule the more quicker the decay. The HAAs attenuation rate increases with the increase of pH and residual chlorine content and lower flows significantly higher than the rest , but by the flow rate is not obvious . (2) the surface of the galvanized pipe component zinc will cause HAAs gradually dehalogenating reduction, the final product containing bromoacetic acid is acetic acid , trichloroacetic acid , dichloroacetic acid and ultimately generate a chloroacetic acid . Hydroxide, zinc oxide and zinc oxide causes the trichloroacetic acid dechlorination generate dichloroacetic tribromo the debromination acetate generate dibromoacetic acid , dibromo acetic acid, a - bromo- acetic acid , dichloroacetic acid, monochloroacetic acid does not occur dehalogenation reaction , and six kinds of HAAs significantly adsorption losses. The zinc of HAAs transformation > zinc hydroxide, zinc oxide. Under the role of the three components , the rate of conversion of HAAs are reduced with the reduction of a halogen atom , and bromine-containing Titanium conversion faster than containing chloroacetic . Flows through the galvanized pipe 0.29 ~ 7.30 h , three surface components role under HAAs concentrations decreased by 50% , reduced by 99% after 1.93 to 48.5 h .

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