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Inactivation of Virus in Drinking Water by Three Chlorine-Containing Disinfectants and Its Pseudo-Kinetics

Author: ZhangYun
Tutor: LiuYan
School: Fudan University
Course: Environmental Engineering
Keywords: Safe drinking water Virus inactivation Free chlorine Chloramine Chlorine dioxide Micro - polluted water Apparent disinfection dynamics
CLC: R123.1
Type: Master's thesis
Year: 2011
Downloads: 102
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Pathogenic microorganisms control is an important aspect of protection of the health and safety of drinking water, in a variety of pathogenic microorganisms, viruses, pathogenic individual a long time due to virus outbreak caused drinking water health events at home and abroad. reported, and therefore should arouse enough attention. However, only a small number of developed countries on the degree of processing of the virus in the drinking water clearly defined, and our 2006 promulgation of the new version of \In addition, currently the majority of the studies for virus inactivation limited to sanitation and disinfection, disinfection and other medical fields, the guiding role of the actual water treatment disinfection process is very limited, therefore urgent to carry out research of the virus drinking water disinfection process. In this study, the screening and the establishment of drinking water disinfection technology in micro-polluted water quality conditions under effective control of the virus, and reveal the apparent chlorine disinfectants inactivated virus disinfection kinetics goal as enteric viruses in water MS2 Coliphage the indicator, the system compares the different dosage of free chlorine, chloramines and chlorine dioxide three chlorine disinfectant on the inactivation of viruses in drinking water and the apparent dynamics, also studied the actual water plant the filtered water and raw water are two types of micro-polluted water disinfection efficacy and laws of the inactivated virus. When free chlorine inactivation of MS2 bacteriophage research results show that the initial dosage in deionized water ≤ 0.5mg / L, 3 log decline in viral titer is no longer reduce the dosage of ≥ 1.0 mg / L within 1 min of virus inactivation below the limit of detection, and increased with the dosage of the virus is completely inactivated the time required shorter, disinfection reach the U.S. Environmental Protection Agency (USEPA) standards (log virus inactivation off Ct value of the survival rate of 99.99%) (the product of the C of residual disinfectant dose and contact time t, in units of mg · L-1 · min) 3.80 mg · L-1 · min. Micro-polluted water have a significant impact on the effect of free chlorine inactivation of MS2 bacteriophage standards required in turn increases the Ct value of the order of deionized water, waterworks filtered water and raw water. Free chlorine in the water attenuation in line with first-order kinetics, micro pollution water quality conditions and after the reaction of organic compounds or ammonia, total residual chlorine decay deviate from first-order kinetics, and the decay rate is greatly reduced. Sufficient dosing free chlorine concentration with respect to the the disinfection requirement and impurities consumption, survival curve (or inactivation curve) is linear, can be carried out by the the reflect an inactivated regular Chick or Chick-Watson model description ; relative lack of initial dosage, the survival curves for the mansard or early concave, the law of the inactivated virus deviate from a reaction can only be fitted with a the Hom model or Selleck model. The results show that chloramine inactivation of MS2 bacteriophage in deionized water in accordance with the current conventional chlorine residual of 2 mg / L dosage, the potency of the virus does not reduce. The initial dosage of 10 mg / L have a more significant inactivation effect, the dosage of 10 mg / L and 20 mg / L, contact 1h after virus titers were reduced 0.5 log and 1.5log, did not reach the USEPA standards. The dosage of 30 mg / L in the initial 5 min of virus inactivation to below the limit of detection, but this is the result of residual free chlorine. Micro-polluted water chloramine inactivation of MS2 bacteriophage certain, but there is no apparent regularity. Chloramine in different types of water attenuation law situation is more serious deviation from a reaction kinetics, water slightly contaminated, the greater the degree of deviation. Chloramine decay rate constant Description of decay rate is far less than one order of magnitude than free chlorine, free chlorine. The survival curves chloramines inactivated MS2 majority for mansard or the early concave, can only be described by the the Hom model or Selleck model. Chlorine dioxide inactivation of MS2 bacteriophage research results show that, in deionized water, the initial dosage of 0.1 mg / L, the virus titer decreased by 1 log no longer reduce the dosage of ≥ 0.175 mg / L The virus titer in a certain period of time continued to decline, the rate of decrease with dosage increases, voted to increase within 1 min in the 1.0 mg / L to below the detection limit viral inactivation disinfection standards required Ct value of 26.4 mg · L-1 · min. Micro-polluted water on the effect of chlorine dioxide inactivated MS2 can have a significant impact in the water filtered water and raw water disinfection standards Ct values ??were 54.2 mg · L-1 · min and 65.0 mg · L-1 · min. In addition, micro-polluted water have an impact on the rate of chlorine dioxide inactivated MS2, deionized water in the initial reaction rate of slightly polluted water. The decay of chlorine dioxide in water order kinetics similar to the kinetics of free chlorine inactivated virus. Actual waterworks process section of the viruses in water test results show that the water from A River B River A, B two water plant raw water were detected in 103 ~ 104PFU/100L (PFU, Plaque Forming Unit, plaque-forming units ) MS2 bacteriophage and ΦX174 of phage intestinal virus and other human pathogenic viruses may exist. The biological pretreatment causes the virus concentration slightly increased coagulation and sedimentation and biological activated carbon process is capable of handling more than 98% of the virus. Two water treatment plant disinfection process effluent and factory water was not detected in the two phage.

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CLC: > Medicine, health > Preventive Medicine,Health > Environmental health,environmental medicine > Water and water supply sanitation > Health surveillance of the health standards of water and water
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