Limnoithona sinensis as refuge for bacteria: protection from UV radiation and chlorine disinfection in drinking water treatment

In this study, we tested the potential of Limnoithona sinensis to provide its attached bacteria refuge against disinfection. The experimental results indicated that in water devoid of zooplankton, both UV radiation and chlorine disinfection significantly decreased the viability of free-living bacteria. In the presence of L. sinensis, however, the attached bacteria could survive and rapidly recover from disinfection. This demonstrated that L. sinensis provided protection from external damage to various aquatic bacteria that were attached to its body. The surviving bacteria remained on L. sinensis after disinfection exposure, which enabled a rapid increase in the bacterial population followed by their subsequent release into the surrounding water. Compared with UV radiation, chlorine disinfection was more effective in terms of inactivating attached bacteria. Both UV radiation and chlorine disinfection had little effect in terms of preventing the spread of undesirable bacteria, due to the incomplete inactivation of the bacteria associated with L. sinensis.

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Photodegradation of etridiazole by UV radiation during drinking water treatment

Chemosphere ◽

10.1016/j.chemosphere.2009.04.052 ◽

2009 ◽

Vol 76 (5) ◽

pp. 609-615 ◽

Cited By ~ 13

Author(s):

Chao Liu ◽

Zhimin Qiang ◽

Fang Tian ◽

Tao Zhang

Keyword(s):

Drinking Water ◽

Water Treatment ◽

Uv Radiation ◽

Drinking Water Treatment

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Presence and interaction of free-living amoebae and amoeba-resisting bacteria in water from drinking water treatment plants

The Science of The Total Environment ◽

10.1016/j.scitotenv.2020.137080 ◽

2020 ◽

Vol 719 ◽

pp. 137080 ◽

Cited By ~ 2

Author(s):

Thiago Santos Gomes ◽

Lucianna Vaccaro ◽

Angela Magnet ◽

Fernando Izquierdo ◽

Dolores Ollero ◽

...

Keyword(s):

Drinking Water ◽

Water Treatment ◽

Drinking Water Treatment ◽

Free Living ◽

Water Treatment Plants

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Potential Repair of Escherichia coli DNA following Exposure to UV Radiation from Both Medium- and Low-Pressure UV Sources Used in Drinking Water Treatment

Applied and Environmental Microbiology ◽

10.1128/aem.68.7.3293-3299.2002 ◽

2002 ◽

Vol 68 (7) ◽

pp. 3293-3299 ◽

Cited By ~ 138

Author(s):

J. L. Zimmer ◽

R. M. Slawson

Keyword(s):

Escherichia Coli ◽

Drinking Water ◽

Water Treatment ◽

Uv Radiation ◽

Drinking Water Treatment ◽

Low Pressure ◽

Plate Count ◽

Treatment Technology ◽

Medium Pressure ◽

Uv Lamp

ABSTRACT The increased use of UV radiation as a drinking water treatment technology has instigated studies of the repair potential of microorganisms following treatment. This study challenged the repair potential of an optimally grown nonpathogenic laboratory strain of Escherichia coli after UV radiation from low- and medium-pressure lamps. Samples were irradiated with doses of 5, 8, and 10 mJ/cm2 from a low-pressure lamp and 3, 5, 8, and 10 mJ/cm2 from a medium-pressure UV lamp housed in a bench-scale collimated beam apparatus. Following irradiation, samples were incubated at 37°C under photoreactivating light or in the dark. Sample aliquots were analyzed for up to 4 h following incubation using a standard plate count. Results of this study showed that E. coli underwent photorepair following exposure to the low-pressure UV source, but no repair was detectable following exposure to the medium-pressure UV source at the initial doses examined. Minimal repair was eventually observed upon medium-pressure UV lamp exposure when doses were lowered to 3 mJ/cm2. This study clearly indicates differences in repair potential under laboratory conditions between irradiation from low-pressure and medium-pressure UV sources of the type used in water treatment.

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Effects of UV radiation on humic acid coagulation characteristics in drinking water treatment processes

Chemical Engineering Journal ◽

10.1016/j.cej.2014.06.113 ◽

2014 ◽

Vol 256 ◽

pp. 137-143 ◽

Cited By ~ 22

Author(s):

Wendong Wang ◽

Wen Wang ◽

Qinghai Fan ◽

Yabo Wang ◽

Zixia Qiao ◽

...

Keyword(s):

Drinking Water ◽

Humic Acid ◽

Water Treatment ◽

Uv Radiation ◽

Drinking Water Treatment ◽

Treatment Processes ◽

Acid Coagulation

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Evaluation of a Community-Scale Drinking Water Treatment System

International Journal for Service Learning in Engineering Humanitarian Engineering and Social Entrepreneurship ◽

10.24908/ijsle.v5i2.2400 ◽

2010 ◽

Vol 5 (2) ◽

pp. 17-31

Author(s):

Keah Ying Lim ◽

Shannon Elaine Wilson ◽

Emily Woolsey ◽

Cristiane Queiroz Surbeck

Keyword(s):

Drinking Water ◽

Water Treatment ◽

Drinking Water Treatment ◽

Quality Parameters ◽

Treatment System ◽

Water Treatment System ◽

Adverse Health Effects ◽

Chlorine Disinfection ◽

The University ◽

Ozone Disinfection

This paper presents the results of the assessment of a community-scale drinking water treatment system by students from the University of _____ School of Engineering, working in collaboration with members of the organization Living Waters for the World. This system, installed worldwide in communities facing a severe lack of sustainable, clean drinking water, uses microfiltration and ozone to treat water. Evaluation of the system required analysis of several water quality parameters and the development of a chlorine disinfection table. It was determined that the ozone disinfection system effectively treats water, removing bacteria that indicate the presence of pathogens that could cause adverse health effects in humans.

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