scholarly journals Performance of a storage tank coupled with UV light on enteric virus inactivation in drinking water

2018 ◽  
Vol 19 (4) ◽  
pp. 1103-1109 ◽  
Author(s):  
Lucas Ariel Totaro Garcia ◽  
Célia Regina Monte Barardi
Keyword(s):  
Drinking Water ◽  
Uv Light ◽  
Human Adenovirus ◽  
Enteric Virus ◽  
Chlorine Concentration ◽  
Residual Chlorine ◽  
Murine Norovirus ◽  
Product Model ◽  
Treatment Tank ◽  
Uv Lamp

Abstract Water destined for personal and household consumption should be safe and acceptable in taste, odor and color. However, complaints about drinking water quality are a common issue among the Brazilian population. Also, due to the pollution of water bodies, social groups that are not supplied by treated water may be exposed to different contaminants. The aim of this study was to assess the efficiency of a water treatment tank coupled with UV light on the inactivation of enteric viruses and the reduction of chlorine concentration for use in residences, as well as in rural and isolated communities. Viral disinfection and chlorine concentration decay assays were performed in a tank with capacity of 300 L and a 36-W UV lamp coupled, with controlled temperature. Recombinant human adenovirus (AdHu5-GFP) and murine norovirus (MNV-1) infectivity were assessed after 0, 3, 6 and 12 h of water recirculation. 99.99% inactivation was reached after 12 h for AdHu5-GFP and before 6 h for MNV-1. Chlorine concentration had a decay of 0.77 mg/L after 12 h. Regarding the efficiency observed, a product model was designed. This tank model was efficient in ensuring viral inactivation as well as in reducing residual chlorine and can be adjusted to other scales.

scholarly journals Study of the free residual chlorine concentration in drinking water in Benin: case of Cotonou municipality

2021 ◽  
Vol 14 (9) ◽  
pp. 3372-3390
Author(s):  
Sydney M.S. Coffi ◽  
Nicaise Yalo ◽  
Bernard Ahamide ◽  
Daouda Mama
Keyword(s):  
Drinking Water ◽  
Water Samples ◽  
Water Distribution ◽  
Water Distribution Network ◽  
Chlorine Concentration ◽  
Assay Method ◽  
Residual Chlorine ◽  
Critical Thresholds ◽  
Drinking Water Distribution ◽  
Free Residual Chlorine

The drinking water is very qualitatively monitored. Despite this monitoring, there is a deterioration in the Free Residual Chlorine Concentration (CCRL) along the drinking water distribution network of the commune of Cotonou. The objective of studying areas of consumer vulnerability where the CCRL reaches critical thresholds (<0.1 mg / l). To achieve this, water samples were taken from various locations in the supply network every day, from 04/30/2018. The assay method used is called N-Diethyl-P-phenylene Diamine (DPD) with the use of a DR / 890 colorimeter. This work reveal that the CCRL undergoes degradation during its delivery to the consumer's taps with average concentrations mainly above the standard in force [0.1; 0.8 mg / l] at the 5% threshold. The work made it possible to establish a linear model for predicting CCRL concentration as a function of distance and to identify areas of vulnerability in the study area. L’eau de consommation est très surveillée sur le plan qualitatif. En dépit de cette surveillance, on constate une dégradation de la Concentration en Chlore Résiduel Libre (CCRL) le long du réseau de distribution d’eau potable de la commune de Cotonou. L’objectif d’étudier les zones de vulnérabilité du consommateur où la CCRL atteint des seuils critiques (< à 0,1 mg /l). Pour y parvenir, des prélèvements d’échantillons d’eau ont été pris à divers endroits du réseau d’approvisionnement chaque jour, du 1er au 30/04/2018. La méthode de dosage utilisée est dénommée N-Diéthyl-P-phénylèneDiamine (DPD) avec usage d'un colorimètre DR/890. Ce travail à révéler, que la CCRL subi une dégradation lors de son acheminement vers les robinets du consommateur avec des concentrations moyennes majoritairement supérieures à la norme en vigueur [0,1 ; 0,8 mg/l] au seuil de 5%. Le travail a permis d’établir un modèle linéaire de prédiction de la concentration en CCRL en fonction de la distance et d’identifier les zones de vulnérabilité de la zone d’étude.

scholarly journals Comparative Inactivation of Enteroviruses and Adenovirus 2 by UV Light

2002 ◽  
Vol 68 (10) ◽  
pp. 5167-5169 ◽  
Author(s):  
Charles P. Gerba ◽  
Dawn M. Gramos ◽  
Nena Nwachuku
Keyword(s):  
Environmental Protection Agency ◽  
Uv Light ◽  
Human Adenovirus ◽  
Enteric Virus ◽  
Adenovirus Type ◽  
Protection Agency ◽  
Candidate List ◽  
The U.S ◽  
Adenovirus Type 2

ABSTRACT The doses of UV irradiation necessary to inactivate selected enteric viruses on the U.S. Environmental Protection Agency Contaminant Candidate List were determined. Three-log reductions of echovirus 1, echovirus 11, coxsackievirus B3, coxsackievirus B5, poliovirus 1, and human adenovirus type 2 were effected by doses of 25, 20.5, 24.5, 27, 23, and 119 mW/cm2, respectively. Human adenovirus type 2 is the most UV light-resistant enteric virus reported to date.

scholarly journals Study of the solution for disinfection by supplying residual chlorine in the distribution networks of drinking water

2018 ◽  
Vol 193 ◽  
pp. 02004
Author(s):  
Dinh Xuan Vinh Phan ◽  
Anh Tuan Vo ◽  
Huynh Thuy Ngan Nguyen ◽  
Thi My Hanh Ho
Keyword(s):  
Drinking Water ◽  
Water Supply ◽  
Concentration Level ◽  
Distribution Networks ◽  
Chlorine Concentration ◽  
Ho Chi Minh City ◽  
Residual Chlorine ◽  
Water Supply Network ◽  
The Stability

This paper proposes a solution to ensure quality of drinking water in water supply network by increasing chlorine concentration, reaching concentration level to disinfect water according to Ministry of Health regulation for water supply. Specifically, this study has been carried out at Tan Kien water supply station, Binh Chanh district, Ho Chi Minh City, by installing an additional chlorine station along the pipeline. As a result, after installation, the residual chlorine concentration has reached required concentration and has maintained the stability of its level. The chlorine station is an integrated, compact solution suitable for similar water supply areas: far from water supply plants, inadequate chlorine concentration and limited space for installation of chlorine system.

A Residual Chlorine Removal Method to Allow Drinking Water Monitoring by Biological Early Warning Systems

2005 ◽  
Author(s):  
Willian H. VAN DER Schalie ◽  
David E. Trader ◽  
Mark W. Widder ◽  
Tommy R. Shedd ◽  
Linda M. Brennan
Keyword(s):  
Drinking Water ◽  
Early Warning ◽  
Early Warning Systems ◽  
Water Monitoring ◽  
Residual Chlorine ◽  
Warning Systems ◽  
Removal Method ◽  
Chlorine Removal

Enteric viruses in drinking water supplies

2002 ◽  
Vol 2 (3) ◽  
pp. 17-22
Author(s):  
A.P. Wyn-Jones ◽  
J. Watkins ◽  
C. Francis ◽  
M. Laverick ◽  
J. Sellwood
Keyword(s):  
Drinking Water ◽  
Heavy Rainfall ◽  
Liquid Culture ◽  
Plaque Assay ◽  
Enteric Viruses ◽  
Enteric Virus ◽  
The Other ◽  
Raw Water ◽  
Rt Pcr ◽  
Water Supplies

Two rural spring drinking water supplies were studied for their enteric virus levels. In one, serving about 30 dwellings, the water was chlorinated before distribution; in the other, which served a dairy and six dwellings the water was not treated. Samples of treated (40 l) and untreated (20 l) water were taken under normal and heavy rainfall conditions over a six weeks period and concentrated by adsorption/elution and organic flocculation. Infectious enterovirus in concentrates was detected in liquid culture and enumerated by plaque assay, both in BGM cells, and concentrates were also analysed by RT-PCR. Viruses were found in both raw water supplies. Rural supplies need to be analysed for viruses as well as bacterial and protozoan pathogens if the full microbial hazard is to be determined.

The Relationship between Concentration and Sensory Properties of 2-Methylisoborneol and Geosmin in Drinking Water

1988 ◽  
Vol 20 (8-9) ◽  
pp. 11-17 ◽  
Author(s):  
T. Ito ◽  
T. Okumura ◽  
M. Yamamoto
Keyword(s):  
Drinking Water ◽  
Water Temperature ◽  
Forced Choice ◽  
Residual Chlorine ◽  
Mixing Ratio ◽  
Consumer Panel ◽  
Triangle Method ◽  
Musty Odor ◽  
The Relationship ◽  
Mixed Samples

The study of the relations between the senses of smell and taste and odorant concentration is important for the solution of odor problems. The threshold concentrations of odor and taste (TOC, TTC) of 2-methylisoborneol (MIB) and geosmin were measured by the non-forced choice triangle method using 12-20 panelists. Both TOC and TTC were found to be functions of water temperature and the concentration of residual chlorine. The TOC and TTC of mixed samples were rather lower than the concentrations calculated from the mixing ratio. The sensitivities of the consumer panel and the number of musty odor complaints from consumers are related to MIB or geosmin concentration. The ratio of the number of complaints to MIB (or geosmin) concentration decreased after maximum complaint, but the sensitivity of the consumer panel remained the same.

PTSA (pressure and thermal swing adsorption) method to remove trihalomethanes from drinking water

1997 ◽  
Vol 35 (7) ◽  
pp. 243-250 ◽  
Author(s):  
Shigekazu Nakano ◽  
Tomoko Fukuhara ◽  
Masami Hiasa
Keyword(s):  
Drinking Water ◽  
Residual Chlorine ◽  
Remarkable Difference ◽  
Adsorption Method ◽  
Heating And Cooling ◽  
Point Of Use ◽  
Thermal Swing Adsorption ◽  
Long Time ◽  
Musty Odor ◽  
Vacuum Heating

It has been widely recognized that trihalomethanes (THMs) in drinking water pose a risk to human health. THMs can be removed to a certain extent by the conventional point-of-use (POU) unit which is composed of activated carbon (AC) and microfilter. But it's life on THMs is relatively shorter than on residual chlorine or musty odor. To extent the life of AC adsorber, pressure and thermal swing adsorption (PTSA) was applied by preferential regeneration of chloroform. PTSA was effective to remove THMs, especially chloroform. Adsorption isotherms of chloroform at 25 and 70°C showed a remarkable difference so that thermal swing was considered effective. Chloroform was also desorbed by reducing pressure. By vacuum heating at 70°C, chloroform was almost desorbed from AC and reversible adsorption was considered possible. A prototype of POU unit with PTSA was proposed. Regeneration mode would consist of dewatering, vacuum heating and cooling (backwashing). The unit was maintained in bacteriostatic condition and could be used for a long time without changing an AC cartridge.

Fluorescence moieties as a surrogate for residual chlorine in three drinking water networks

2021 ◽  
Vol 411 ◽  
pp. 128519
Author(s):  
Tahir Maqbool ◽  
Jiaxing Zhang ◽  
Yanling Qin ◽  
Muhammad Bilal Asif ◽  
Quang Viet Ly ◽  
...  
Keyword(s):  
Drinking Water ◽  
Residual Chlorine ◽  
Water Networks
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