The impact of biological filtration on the proliferation of antimicrobial resistance in drinking water

AbstractAntimicrobial resistance (AMR) in drinking water has received less attention than counterparts in the urban water cycle. While culture-based techniques or gene-centric PCR have been used to probe the impact of treatment approaches (e.g., disinfection) on AMR in drinking water, to our knowledge there is no systematic comparison of AMR traits between disinfected and disinfectant residual-free drinking water systems. We use metagenomics to assess the associations between disinfectant residuals and AMR prevalence and its host association in full-scale drinking water distribution systems (DWDSs). The differences in AMR profiles between DWDSs are associated with the presence or absence of disinfectant. Further, AMR genes and mechanisms enriched in disinfected systems are associated with drug classes primarily linked to nontuberculous mycobacteria (NTM). Finally, evaluation of metagenome assembled genomes (MAGs) of NTM indicates that they possess AMR genes conferring intrinsic resistance to key antibiotics, whereas such NTM genomes were not detected in disinfectant residual free DWDSs. Thus, disinfection may not only influence the AMR profiles of the drinking water microbiome but also select for NTM with intrinsic AMR.

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Impact of Community-Led Total Sanitation and Hygiene on Prevalence of Diarrheal Disease and Associated Factors among Under-Five Children: A Comparative Cross-Sectional Study in Selected Woredas of Gamo Gofa Zone, Southern Ethiopia

Advances in Public Health ◽

10.1155/2020/8237101 ◽

2020 ◽

Vol 2020 ◽

pp. 1-12

Author(s):

Agune Ashole Alto ◽

Wanzahun Godana ◽

Genet Gedamu

Keyword(s):

Drinking Water ◽

Diarrheal Disease ◽

Cross Sectional Study ◽

Sectional Study ◽

Cross Sectional ◽

Under Five ◽

Under Five Children ◽

Sanitation And Hygiene ◽

The Impact ◽

Gamo Gofa

Background. Diarrheal diseases are still one of the major causes of morbidity in under-five children in sub-Saharan Africa. In Ethiopia, diarrhea is responsible for 9% of all deaths and is the major cause of under-five mortality. Objective. To assess the impact of community-led total sanitation and hygiene on the prevalence of diarrheal disease and factors associated among under-five children in Gamo Gofa Zone. Methods. Community-based comparative cross-sectional study design was used to compare the impact of community-led total sanitation and hygiene intervention on under-five diarrheal disease. Multistage sampling method was employed. The data were collected by using pretested structured questionnaires. Data quality was ensured by daily supervision completeness and consistency. The data were coded, entered, and cleaned by using Epi Info version 7 and were analyzed by using SPSS version 20. Bivariate and multivariable analyses were carried out by using binary logistic regression. Significance was declared by using p value of <0.05 and AOR with 95% confidence intervals. Results. The response rate of this study was 93.3%. The overall diarrhea prevalence was 27.5% (CI = (24.06, 30.97)) which was 18.9% (CI = (14.94, 23.2)) in implemented and 36.2%. (CI = (30.41, 41.59)) in nonimplemented woredas. Children whose age was between 12 and 23 months (AOR = 1.6) and greater than 24 months (AOR = 5), availability of handwashing facilities (AOR = 4), disposal of waste in open field (AOR = 9.7), unimproved source of drinking water (AOR = 6.5), using only water for handwashing (AOR = 6), children who started complementary feeding less than 6 months (AOR = 5.6) and greater than 6 months (AOR = 5.2), and utensils used to feed children such as bottle (AOR = 3.9) were the factors positively associated with diarrhea. Conclusion. The overall prevalence of under-five diarrhea was 27.5%. The prevalence was low in CLTSH woredas as compared with non-CLTSH woredas. The study showed that handwashing facility, using only water for handwashing, open refuse disposal, and unimproved source of drinking water among under-five had a statistically significant association with diarrhea occurrence in CLTSH nonimplemented areas. Integrated efforts are needed from the Ministry of Health together with the WASH Project in improving drinking water, handwashing facilities, and solid waste disposal practices.

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Hydrochemical Characterisation of High-Fluoride Groundwater and Development of a Conceptual Groundwater Flow Model Using a Combined Hydrogeological and Hydrochemical Approach on an Active Volcano: Mount Meru, Northern Tanzania

Water ◽

10.3390/w13162159 ◽

2021 ◽

Vol 13 (16) ◽

pp. 2159

Author(s):

George Bennett ◽

Jill Van Reybrouck ◽

Ceven Shemsanga ◽

Mary Kisaka ◽

Ines Tomašek ◽

...

Keyword(s):

Drinking Water ◽

Large Scale ◽

Active Volcano ◽

Aquifer System ◽

Groundwater Samples ◽

Northern Tanzania ◽

Different Seasons ◽

High Fluoride ◽

Arusha National Park ◽

The Impact

This study characterises high-fluoride groundwater in the aquifer system on the flanks of Mount Meru, focusing on parts of the flanks that were only partially or not at all covered by previous research. Additionally, we analyse the impact of rainwater recharge on groundwater chemistry by monitoring spring discharges during water sampling. The results show that the main groundwater type in the study area is NaHCO3 alkaline groundwater (average pH = 7.8). High F− values were recorded: in 175 groundwater samples, the concentrations range from 0.15 to 301 mg/L (mean: 21.89 mg/L, median: 9.67 mg/L), with 91% of the samples containing F− values above the WHO health-based guideline for drinking water (1.5 mg/L), whereas 39% of the samples have Na+ concentrations above the WHO taste-based guideline of 200 mg/L. The temporal variability in F− concentrations between different seasons is due to the impact of the local groundwater recharge. We recommend that a detailed ecohydrological study should be carried out for the low-fluoride springs from the high-altitude recharge areas on the eastern and northwestern flanks of Mount Meru inside Arusha National Park. These springs are extracted for drinking purposes. An ecohydrological study is required for the management of these springs and their potential enhanced exploitation to ensure the sustainability of this water extraction practice. Another strategy for obtaining safe drinking water could be to use a large-scale filtering system to remove F− from the groundwater.

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A Comparative Analysis of the Government and NGOs in Delivering Quality Services for the Rural People of Pakistan: Community Perspectives

Asia-Pacific Journal of Rural Development ◽

10.1177/1018529120977260 ◽

2020 ◽

Vol 30 (1-2) ◽

pp. 203-225

Author(s):

Mohsin Khan ◽

Jetnor Kasmi ◽

Abdul Saboor ◽

Iftikhar Ali

Keyword(s):

Drinking Water ◽

Service Delivery ◽

Rural Areas ◽

Public Health Education ◽

Road Transport ◽

Extension Services ◽

Rural People ◽

Basic Services ◽

The Government ◽

The Impact

Often the government and the non-governmental organisations (NGOs) are criticised for their poor performances in delivering services particularly in rural areas. However, there has been limited research on the assessment of their relative performances in service delivery as well as on the perceptions of people on the quality of such service delivery. This study examines the relative performances of NGOs and the governmental development interventions that provide basic services including public health, education, drinking water and sanitation. The study explains the impact of agricultural extension services and infrastructure such as access to roads and markets on the rural people and measures the satisfaction level of the rural community. For this purpose, 225 households (HHs) in 8 villages of Phalia Tehsil, district Mandi Bahauddin, Punjab, Pakistan were first surveyed in 2010 and then in 2014 using a structured questionnaire. The findings reveal different satisfaction levels of HHs, with most of them expressing less satisfaction on government service delivery compared with NGOs. They reveal satisfaction over the performance of NGOs in health, drinking water supplies and agriculture extension services. Further, the study shows an increasing satisfaction of people on access to road, transport, agri-market and price of agri-commodities by the government.

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Impacts of Microcystins on Morphological and Physiological Parameters of Agricultural Plants: A Review

Plants ◽

10.3390/plants10040639 ◽

2021 ◽

Vol 10 (4) ◽

pp. 639

Author(s):

Alexandre Campos ◽

El Mahdi Redouane ◽

Marisa Freitas ◽

Samuel Amaral ◽

Tomé Azevedo ◽

...

Keyword(s):

Drinking Water ◽

Human Health ◽

Economic Loss ◽

Crop Productivity ◽

Physiological Parameters ◽

World Health ◽

Potential Threat ◽

Regulatory Limits ◽

Agricultural Plants ◽

The Impact

Cyanobacteria are a group of photosynthetic prokaryotes that pose a great concern in the aquatic environments related to contamination and poisoning of wild life and humans. Some species of cyanobacteria produce potent toxins such as microcystins (MCs), which are extremely aggressive to several organisms, including animals and humans. In order to protect human health and prevent human exposure to this type of organisms and toxins, regulatory limits for MCs in drinking water have been established in most countries. In this regard, the World Health Organization (WHO) proposed 1 µg MCs /L as the highest acceptable concentration in drinking water. However, regulatory limits were not defined in waters used in other applications/activities, constituting a potential threat to the environment and to human health. Indeed, water contaminated with MCs or other cyanotoxins is recurrently used in agriculture and for crop and food production. Several deleterious effects of MCs including a decrease in growth, tissue necrosis, inhibition of photosynthesis and metabolic changes have been reported in plants leading to the impairment of crop productivity and economic loss. Studies have also revealed significant accumulation of MCs in edible tissues and plant organs, which raise concerns related to food safety. This work aims to systematize and analyze the information generated by previous scientific studies, namely on the phytotoxicity and the impact of MCs especially on growth, photosynthesis and productivity of agricultural plants. Morphological and physiological parameters of agronomic interest are overviewed in detail in this work, with the aim to evaluate the putative impact of MCs under field conditions. Finally, concentration-dependent effects are highlighted, as these can assist in future guidelines for irrigation waters and establish regulatory limits for MCs.

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Sodium Hypochlorite Treatment: The Impact on Bacteria and Endotoxin Concentrations in Drinking Water Pipes of A Pig Nursery

Agriculture ◽

10.3390/agriculture10030086 ◽

2020 ◽

Vol 10 (3) ◽

pp. 86

Author(s):

Regina Böger ◽

Karl Rohn ◽

Nicole Kemper ◽

Jochen Schulz

Keyword(s):

Water Quality ◽

Drinking Water ◽

Sodium Hypochlorite ◽

Coliform Bacteria ◽

Treated Water ◽

Water Pipes ◽

Pseudomonas Spp ◽

Untreated Water ◽

The Impact ◽

Total Bacteria

Poor drinking water quality can affect pigs’ health and performance. The disinfection of water may enhance microbial water quality. In this study, bacteria and endotoxins in sodium hypochlorite-treated and -untreated water from one pig nursery were analyzed. Water samples were taken from incoming water and from compartments with treated and untreated water at the beginning and end of pipes and from nipples. The farm was visited 14 times to measure total bacteria counts and concentrations of Pseudomonas spp. and endotoxins. Additionally, the occurrence of coliform bacteria was analyzed. A mixed model analysis revealed significant reductions in total bacteria counts and Pseudomonas spp. in treated water at the beginning of pipes and at nipple drinkers. The differences between bacteria concentrations at the end of pipes had no clear trend. Endotoxin concentrations were approximately equal at the beginning of pipes and at nipple drinkers but were found to have differences at the end of pipes. The occurrence of coliform bacteria was significantly reduced in treated water. The application of sodium hypochlorite can significantly reduce bacteria in water pipes. Endotoxin concentrations were mostly unaffected by water treatment. Disinfection of the dead-end pipe sections failed, and thus these parts should be regarded as potential contamination sources.

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Environmental Performance of Small-Scale Seawater Reverse Osmosis Plant for Rural Area Water Supply

Membranes ◽

10.3390/membranes11010040 ◽

2021 ◽

Vol 11 (1) ◽

pp. 40

Author(s):

Latifah Abdul Ghani ◽

Nora’aini Ali ◽

Ilyanni Syazira Nazaran ◽

Marlia M. Hanafiah

Keyword(s):

Drinking Water ◽

Global Warming ◽

Water Supply ◽

Reverse Osmosis ◽

Resource Scarcity ◽

Small Scale ◽

Seawater Desalination ◽

Seawater Reverse Osmosis ◽

Desalination Technology ◽

The Impact

Seawater desalination is an alternative technology to provide safe drinking water and to solve water issues in an area having low water quality and limited drinking water supply. Currently, reverse osmosis (RO) is commonly used in the desalination technology and experiencing significant growth. The aim of this study was to analyze the environmental impacts of the seawater reverse osmosis (SWRO) plant installed in Kampung Pantai Senok, Kelantan, as this plant was the first installed in Malaysia. The software SimaPro 8.5 together with the ReCiPe 2016 database were used as tools to evaluate the life cycle assessment (LCA) of the SWRO plant. The results showed that the impact of global warming (3.90 kg CO2 eq/year) was the highest, followed by terrestrial ecotoxicity (1.62 kg 1,4-DCB/year) and fossil resource scarcity (1.29 kg oil eq/year). The impact of global warming was caused by the natural gas used to generate the electricity, mainly during the RO process. Reducing the environmental impact can be effectively achieved by decreasing the electricity usage for the seawater desalination process. As a suggestion, electricity generation can be overcome by using a high-flux membrane with other suitable renewable energy for the plant such as solar and wind energy.

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Water Quality Violations and Avoidance Behavior: Evidence from Bottled Water Consumption

The American Economic Review ◽

10.1257/aer.101.3.448 ◽

2011 ◽

Vol 101 (3) ◽

pp. 448-453 ◽

Cited By ~ 62

Author(s):

Joshua Graff Zivin ◽

Matthew Neidell ◽

Wolfram Schlenker

Keyword(s):

Water Quality ◽

Drinking Water ◽

Willingness To Pay ◽

Water Consumption ◽

Avoidance Behavior ◽

Bottled Water ◽

Poor Water Quality ◽

Using Data ◽

The Impact

We examine the impact of poor water quality on avoidance behavior by estimating the change in bottled water purchases in response to drinking water violations. Using data from a national grocery chain matched with water quality violations, we find an increase in bottled water sales of 22 percent from violations due to microorganisms and 17 percent from violations due to elements and chemicals. Back-of-the envelope calculations yield costs of avoidance behavior at roughly $60 million for all nationwide violations in 2005, which likely reflects a significant understatement of the total willingness to pay to eliminate violations.

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From micro to macro-contaminants: The impact of low-energy titanium dioxide photocatalysis followed by filtration on the mitigation of drinking water organics

Chemosphere ◽

10.1016/j.chemosphere.2018.10.213 ◽

2019 ◽

Vol 217 ◽

pp. 111-121 ◽

Cited By ~ 4

Author(s):

Brooke K. Mayer ◽

Carlan Johnson ◽

Yu Yang ◽

Nicole Wellenstein ◽

Emily Maher ◽

...

Keyword(s):

Drinking Water ◽

Titanium Dioxide ◽

Low Energy ◽

Titanium Dioxide Photocatalysis ◽

The Impact

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The impact of investment on drinking water quality in rural China

China Agricultural Economic Review ◽

10.1108/caer-05-2015-0062 ◽

2017 ◽

Vol 9 (2) ◽

pp. 255-269

Author(s):

Ai Yue ◽

Yaojiang Shi ◽

Renfu Luo ◽

Linxiu Zhang ◽

Natalie Johnson ◽

...

Keyword(s):

Water Quality ◽

Drinking Water ◽

Rural Areas ◽

Tap Water ◽

Rural China ◽

Ordinary Least Squares ◽

Content Type ◽

Representative Data ◽

Nationally Representative ◽

The Impact

Purpose Although access to safe drinking water is one of the most important health-related infrastructure programs in the world, drinking water remains a large problem in China today, especially in rural areas. Despite increased government investment in water resource protection and management, there is still an absence of academic studies that are able to document what path the investment has taken and whether it has had any tangible impact. The purpose of this paper is to analyze the impact of drinking water investment on drinking water in China. Design/methodology/approach The authors make use of nationally representative data from 2005 and 2012 to measure the impact of drinking water investment among 2,028 rural households in 101 villages across five provinces. Both ordinary least squares regression and probit regression are used to analyze the correlates and the impact of drinking water investment. Findings The authors demonstrate that water quality was likely a significant problem in 2004 but that China’s investment into drinking water appears to have resulted in initial improvements during the study period. The authors show that the most significant change came about in terms of hardware: villages that received more drinking water investment now have more piped tap water and more access to water treatment infrastructure (disinfecting and filtering facilities). High rates of rural resident satisfaction with drinking water suggest the effects of drinking water investment are being felt at the village level. Originality/value To the authors’ knowledge, this is the first empirical study on drinking water investment over time in rural China using nationally representative data.

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