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Study on Emergency Treatment of Potable Water Suddenly Polluted by Organochlorine Pesticides

Author: WuYongQiang
Tutor: ChenZhongLin
School: Harbin Institute of Technology
Course: Urban Water Resources
Keywords: Lindane Triclosan insecticide ester Enhanced coagulation Potassium permanganate Powdered Activated Carbon
CLC: TU991.2
Type: Master's thesis
Year: 2011
Downloads: 63
Quote: 0
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Abstract


The sudden accident or disaster led to the contamination of drinking water sources by organochlorine pesticides, organochlorine pesticides are POPs, recalcitrance, bioaccumulation and toxicity, so the water is sudden organochlorine pesticide contamination will affect the conventional safe supply of water treatment processes. In order to guarantee the reliability of the water supply, it is necessary to study security technology event of a sudden organochlorine pesticide contamination in the raw water and emergency treatment. Conventional water treatment processes, respectively, to study its separate removal efficiency of of lindane and trichloro insecticidal ester as well as pH, turbidity, humic acid, Ca 2 and other factors. The results show that: separate conventional coagulation and sedimentation poor removal of organochlorine pesticides in water, the residual concentration is greater than the limits specified by the national drinking water quality standards; the trichloro insecticidal esters removal efficiency increases with increasing pH and increasing , lindane removal increases with increasing pH will remain basically unchanged; Lindane in water and the removal of trichloro insecticidal esters with increased turbidity first increases and then basically unchanged for 45NTU removal of turbidity for the best removal rates were 12.4% and 17.1%; the insecticidal esters removal of Lindane in water and trichloroacetic With increasing concentration of humic acid increase; Lindane in water and the removal of trichloro insecticidal esters with Ca 2 concentration increases the overall downward trend. Conventional coagulation and sedimentation can not guarantee of lindane and trichloro insecticidal ester effectively remove chlorine, ozone, potassium permanganate and powdered activated carbon pre-treatment to strengthen the effect of removal of organochlorine pesticides in water and its influencing factors. The results show that: chlorine, potassium permanganate and powdered activated carbon alone Intensified Pre Lindane in water and trichloro insecticidal esters can not make the national drinking water quality standards under the concentration limits; preozonation strengthening the removal of lindane and trichloro kill insects ester significant effect, the concentration limits specified in the treated effluent to meet the national standards for drinking water quality, and of lindane and trichloro insecticidal ester removal rate increases with the increase of ozone dosage and pretreatment time. Potassium permanganate and powder activated carbon process can significantly improve the removal of Lindane in water and trichloro insecticidal esters experiment to study the factors associated with the process on the raw water exceeded the multiples removal of organochlorine pesticides and their impact examine the impact of factors pH, turbidity, humic acid and Ca 2 . The research shows that: the combined process can be enhanced coagulation ensure the different excessive multiple of organochlorine pesticide contamination of raw water standards; pH, turbidity and humic acid couplet overall process to remove the impact is not obvious of lindane and trichloro insecticidal ester; Ca 2 the couplet process to remove lindane and trichloro the insecticidal esters overall impact, the removal rate with the of lindane and trichloro insecticidal ester the of Ca 2 concentration increased The large decline in the of Ca 2 concentration of 3mg / L, the removal rate of lindane and trichloro insecticidal ester declined 10% and 16%. Overall, potassium permanganate and powdered activated carbon for effective removal of organochlorine pesticides in water and easy to interface with the existing water treatment processes.

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