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Study on Optimization of Drinking Water Disinfection Process

Author: WangHaiYan
Tutor: DaiChangHong
School: Qingdao Technological University
Course: Environmental Engineering
Keywords: Drinking water Disinfection Residual Chlorine Decay Chloramine Biological stability
CLC: TU991.2
Type: Master's thesis
Year: 2010
Downloads: 53
Quote: 0
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Abstract


Tap water delivered to the user from the waterworks, the water in the pipe network flow complex physical, chemical and biological reactions of a few hours or even a few days time, water will occur in a large underground pipe network, some of the major water quality indicators, such as chlorine, bacteria indicators may change significantly; harmful bacteria and microbes multiply the hazard to human health. Therefore, to improve the water quality of the pipe network is to improve an important part of the quality of water supplies. The principal water static model to study the influencing factors of residual chlorine decay of chlorine and chloramine disinfection on biological stability; BAC water dosing AR reactor dynamic model to study the disinfection of microbial growth control ; last comprehensive exposition of conventional drinking water disinfection process optimization. Residual Chlorine Decay Experiments show that temperature significantly affect the residual chlorine decay rate constant, the temperature from 10 ~ ℃ increased to 30 ° C, the Kb value rose from 0.0311 to 0.1225, the higher the temperature, the quicker the decay of residual chlorine in the water; completely the same water samples, the higher the quality of the initial chlorine concentration, the quicker the decay of free chlorine and total chlorine; Residual Chlorine Decay and no significant correlation between the PH value; strong exponential relationship exists between the DOC and Kb values. Chlorine disinfection process, despite the BDOC increase, but still meet the the biological stability threshold requirements, and BAC water chlorine decay rate was significantly lower than the microfiltration water and raw water, longer residence time can still maintain a high The level of residual chlorine value, and then continue to inhibit microbial growth. BDOC changes chloramine disinfection process similar to chlorine disinfection process. BAC process is an effective means to protect the biological stability of drinking water. The water chlorination amount of 1mg / l effluent residual chlorine amount of 0.04mg / l. The HPC count suspended in the water bacteria was 6.30 × 10 ~ 3, the number of colonies on a coupon of 4.60 × 10 ~ 4, microorganisms are not well controlled pipe network. When the increase in volume of the Chlorine dosing 2mg / l, the effluent residual chlorine in an amount of 0.3mg / l, the number of colonies grown on the both can be controlled in both magnitude. Take full advantage of the front-end process of pollutant removal efficiency, disinfectant dosing point as close as possible to the rear of the water treatment process to reduce disinfection byproducts, reduce the amount of chlorination, to reduce the generation of biodegradable nutrient substrate. Reasonable choice of the point of dosing of chlorine, improved cast chloro pipeline set, full use of the hydraulic conditions of the process piping and mechanical stirring, elbows, mixing, and spraying diffuser line mixer such as a variety of ways to ensure chlorosalicylaldehyde sufficiently mixed.

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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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