Chlorine inactivation of Tubifex tubifex in drinking water and the synergistic effect of sequential inactivation with UV irradiation and chlorine

Autor: Li Zhihong, He Panpan, Xu Chao, Xiao-Bao Nie, Yuan-Nan Long
Rok vydání: 2017
Předmět:
Environmental Engineering
Ultraviolet Rays
Health
Toxicology and Mutagenesis
Disinfectant
0208 environmental biotechnology
chemistry.chemical_element
02 engineering and technology
010501 environmental sciences
01 natural sciences
Water Purification
chemistry.chemical_compound
Nephelometry and Turbidimetry
Water Quality
polycyclic compounds
Chlorine
Animals
Environmental Chemistry
Oligochaeta
Turbidity
0105 earth and related environmental sciences
Biological Oxygen Demand Analysis
biology
Chemistry
Drinking Water
Chemical oxygen demand
Temperature
Public Health
Environmental and Occupational Health
General Medicine
General Chemistry
Hydrogen-Ion Concentration
Contamination
biology.organism_classification
Pollution
Tubifex
020801 environmental engineering
Disinfection
Kinetics
Potassium permanganate
Environmental chemistry
Tubifex tubifex
Disinfectants
Zdroj: Chemosphere. 177:7-14
ISSN: 0045-6535
Popis: The inactivation of Tubifex tubifex is important to prevent contamination of drinking water. Chlorine is a widely-used disinfectant and the key factor in the inactivation of T. tubifex. This study investigated the inactivation kinetics of chlorine on T. tubifex and the synergistic effect of the sequential use of chlorine and UV irradiation. The experimental results indicated that the Ct (concentration × timereaction) concept could be used to evaluate the inactivation kinetics of T. tubifex with chlorine, thus allowing for the use of a simpler Ct approach for the assessment of T. tubifex chlorine inactivation requirements. The inactivation kinetics of T. tubifex by chlorine was found to be well-fitted to a delayed pseudo first-order Chick-Watson expression. Sequential experiments revealed that UV irradiation and chlorine worked synergistically to effectively inactivate T. tubifex as a result of the decreased activation energy, Ea, induced by primary UV irradiation. Furthermore, the inactivation effectiveness of T. tubifex by chlorine was found to be affected by several drinking water quality parameters including pH, turbidity, and chemical oxygen demand with potassium permanganate (CODMn) concentration. High pH exhibited pronounced inactivation effectiveness and the decrease in turbidity and CODMn concentrations contributed to the inactivation of T. tubifex.
Databáze: OpenAIRE
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