Microbiological quality of chlorinated water after storage in ceramic pots

2012 ◽  
Vol 2 (4) ◽  
pp. 250-253 ◽  
Author(s):  
Clair Null ◽  
Daniele Lantagne
Keyword(s):  
Storage Time ◽  
Diarrheal Disease ◽  
Microbiological Quality ◽  
World Health ◽  
Household Water Treatment ◽  
E Coli ◽  
Guideline Values ◽  
Household Water ◽  
Rural Kenya ◽  
Health Organization

Household water treatment with sodium hypochlorite has been shown to reduce self-reported diarrheal disease in developing countries. Reported hypochlorite use, time since treatment, total chlorine residual (TCR), and E. coli concentration results from 589 household surveys in rural Kenya were analyzed to quantify the effect of exceeding recommended 24 hour post-treatment water storage time in ceramic pots. Exceeding storage time recommendations impacted treatment efficacy, as 87% of reported treaters with TCR ≥ 0.2 mg/L storing their water ≤ 24 hours met World Health Organization (WHO) E. coli guideline values, compared to 77% of reported treaters with TCR ≥ 0.2 mg/L storing water >24 hours (p = 0.024) and 7% of reported non-treaters. Implementing organizations face the trade-off between promoting treating water every 24 hours and accepting slightly compromised efficacy.

scholarly journals Sodium hypochlorite dosage for household and emergency water treatment: updated recommendations

2017 ◽  
Vol 16 (1) ◽  
pp. 112-125 ◽  
Author(s):  
Natalie Wilhelm ◽  
Anya Kaufmann ◽  
Elizabeth Blanton ◽  
Daniele Lantagne
Keyword(s):  
Water Treatment ◽  
Sodium Hypochlorite ◽  
Diarrheal Disease ◽  
Microbiological Quality ◽  
Water Source ◽  
Field Studies ◽  
Household Water Treatment ◽  
E Coli ◽  
Log Reduction ◽  
Household Water

Abstract Household water treatment with chlorine can improve the microbiological quality of household water and reduce diarrheal disease. We conducted laboratory and field studies to inform chlorine dosage recommendations. In the laboratory, reactors of varying turbidity (10–300 NTU) and total organic carbon (0–25 mg/L addition) were created, spiked with Escherichia coli, and dosed with 3.75 mg/L sodium hypochlorite. All reactors had >4 log reduction of E. coli 24 hours after chlorine addition. In the field, we tested 158 sources in 22 countries for chlorine demand. A 1.88 mg/L dosage for water from improved sources of <5 or <10 NTU turbidity met free chlorine residual criteria (≤2.0 mg/L at 1 hour, ≥0.2 mg/L at 24 hours) 91–94% and 82–87% of the time at 8 and 24 hours, respectively. In unimproved water source samples, a 3.75 mg/L dosage met relaxed criteria (≤4.0 mg/L at 1 hour, ≥0.2 mg/L after 24 hours) 83% and 65% of the time after 8 and 24 hours, respectively. We recommend water from improved/low turbidity sources be dosed at 1.88 mg/L and used within 24 hours, and from unimproved/higher turbidity sources be dosed at 3.75 mg/L and consumed within 8 hours. Further research on field effectiveness of chlorination is recommended.

Assessment of the quality, effectiveness, and acceptability of ceramic water filters in Tanzania

2016 ◽  
Vol 6 (2) ◽  
pp. 195-204 ◽  
Author(s):  
Ansley Lemons ◽  
Ariel Branz ◽  
Mesiaki Kimirei ◽  
Tracy Hawkins ◽  
Daniele Lantagne
Keyword(s):  
Flow Rate ◽  
Mixed Methods Research ◽  
Diarrheal Disease ◽  
Group Discussions ◽  
Household Water Treatment ◽  
Ceramic Filters ◽  
E Coli ◽  
Ceramic Water Filters ◽  
Household Water

Globally, approximately two billion people drink contaminated water. Use of household water treatment (HWT) methods, such as locally manufactured ceramic filters, reduces the diarrheal disease burden associated with unclean water. We evaluated the quality, effectiveness, and acceptability of ceramic filters in two communities in Arusha, Tanzania, by conducting: 1) baseline household surveys with 50 families; 2) filter flow rate testing; 3) filter distribution with training sessions; 4) follow-up surveys at 2, 4, and 6 weeks after distribution; and 5) project end focus group discussions. We tested Escherichia coli (E. coli) and turbidity at baseline and the first two follow-ups. We found: 1) filter quality was low, as only 46% of filters met recommended flow rate guidelines and 18% of filters broke during the 6-week study; 2) filter effectiveness was moderate, with 8% and 35% of filters effectively reducing E. coli to <1 CFU/100 mL and <10 CFU/100 mL, respectively, at follow-ups; and, 3) filter acceptability was high, with 94% overall satisfaction and 96–100% reported use in the previous day. These results highlight the importance of mixed methods research as HWT product quality, effectiveness, and acceptability all impact product efficacy, and the need for quality assurance/quality control and certification schemes for locally manufactured HWT products.

Evaluation of household drinking water filter distribution programs in Haiti

2016 ◽  
Vol 6 (1) ◽  
pp. 42-54 ◽  
Author(s):  
Justine Rayner ◽  
Anna Murray ◽  
Myriam Joseph ◽  
Ariel Branz ◽  
Daniele Lantagne
Keyword(s):  
Disease Burden ◽  
Diarrheal Disease ◽  
Local Context ◽  
Household Water Treatment ◽  
Water Filter ◽  
Guideline Values ◽  
Household Water ◽  
Effective Technology ◽  
Effective Use

Household water treatment (HWT) can reduce the diarrheal disease burden in populations without access to safe water. We evaluated five programs that distributed biosand, ceramic, or Sawyer filters in Haiti after the 2010 earthquake and cholera outbreak. We conducted household surveys and tested Escherichia coli and turbidity in stored household untreated and treated water in ∼50 randomly selected households from each program. Across programs, self-reported filter use ranged from 27 to 78%; confirmed use (participants with reported use who also showed the filter with water currently in it) ranged from 20 to 76%; and effective use (participants who used the filter to improve water quality to international guideline values) ranged from 0 to 54%. Overall, programs that more successfully met evaluation metrics: (1) distributed an effective technology; (2) provided safe storage; (3) required cash investment; (4) provided initial training; (5) provided follow-up; (6) provided supply-chain access; (7) targeted households relying on contaminated water sources; and, (8) had experience working in the local context. These findings, similar to results of previous research on HWT, suggest that well-implemented programs have the potential to result in sustained household filter use in Haiti.

scholarly journals Residual Maintenance Using Sodium Hypochlorite, Sodium Dichloroisocyanurate, and Chlorine Dioxide in Laboratory Waters of Varying Turbidity

Water ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1309 ◽  
Author(s):  
Karin Gallandat ◽  
David Stack ◽  
Gabrielle String ◽  
Daniele Lantagne
Keyword(s):  
Sodium Hypochlorite ◽  
Chlorine Dioxide ◽  
Storage Time ◽  
Water Storage ◽  
Decay Rates ◽  
Kaolin Clay ◽  
Household Water Treatment ◽  
E Coli ◽  
Household Water ◽  
Sodium Dichloroisocyanurate

Sodium hypochlorite (NaOCl) and sodium dichloroisocyanurate (NaDCC) are commonly used for household water treatment (HWT); chlorine dioxide (ClO2) is a potential new HWT option. We compared the residual maintenance of NaOCl, NaDCC, and ClO2 over 24 hours using recommended dosages (2 and 4 mg/L) in waters of varying turbidity (0–300 NTU, from kaolin clay or creek-bottom sediments) and total organic carbon (TOC) concentrations (0–100 mg/L), for a total of 324 reactors. NaOCl and NaDCC had similar free chlorine decay rates, and ClO2 decayed more rapidly across all of the tested conditions. Little variability was observed across clay-based turbidity levels and TOC concentrations. With a dosage of 2 mg/L, a residual ≥0.2 mg/L was maintained at 30 NTU for NaOCl and 100 NTU for NaDCC; for ClO2, 4 mg/L were required to maintain ≥0.2 mg/L under all conditions except at zero turbidity. Comparisons with data from the literature suggest that the three compounds would inactivate E. coli, rotavirus, and Giardia cysts within 1 hour under all conditions, except 300 NTU for NaOCl and NaDCC. All three disinfectants are similarly efficacious for this usage; however, differences are seen in decay rates that may influence disinfectant selection depending on water storage time.

Current practices in manufacturing locally-made ceramic pot filters for water treatment in developing countries

2013 ◽  
Vol 3 (2) ◽  
pp. 252-261 ◽  
Author(s):  
Justine Rayner ◽  
Brian Skinner ◽  
Daniele Lantagne
Keyword(s):  
Quality Control ◽  
Water Treatment ◽  
Best Practice ◽  
Diarrheal Disease ◽  
Microbiological Quality ◽  
Household Water Treatment ◽  
Production Methods ◽  
Household Water ◽  
Control Procedures

Locally produced ceramic pot filters have been shown to improve the microbiological quality of household drinking water and reduce the burden of diarrheal disease in users. They are considered one of the most promising household water treatment methods. However, overarching manufacturing and quality control guidelines do not exist for the 35 decentralized filter factories in 18 countries that currently produce filters. In this study, we conducted manufacturing process surveys with 25 filter factories worldwide to document production methods and identify areas where manufacturing and quality control guidelines are needed. Our results show that manufacturing processes vary widely both between and within factories, including the consistency of materials, manufacturing methods, and quality control practices. These variations pose concerns about the consistency and quality of locally produced filters in the absence of standardized quality control procedures. We propose areas where manufacturing guidelines are needed to assist factories in producing consistently high quality filters, and identify topics where further research is needed to refine manufacturing recommendations. These results guided the development of a best practice manual that described consensus-based recommendations to advance consistent, quality-controlled filter production world-wide.

Microbiological performance of novel household water treatment devices in India

2013 ◽  
Vol 14 (1) ◽  
pp. 91-98 ◽  
Author(s):  
Z. P. Bhathena ◽  
S. Shrivastava ◽  
Poonam Londhe ◽  
Joe Brown
Keyword(s):  
Water Treatment ◽  
Performance Testing ◽  
Testing Temperature ◽  
World Health ◽  
Household Water Treatment ◽  
Household Water ◽  
Actual Use ◽  
Gravity Driven ◽  
Health Organization ◽  
Novel Devices

Commercial innovation of household-scale water treatment (HWT) devices is rapid in India, where unsafe drinking water contributes to the high burden of disease and death associated with diarrhoeal diseases. Performance testing data for novel devices are not publicly available and there has been no systematic attempt to independently verify manufacturer effectiveness claims. We purchased three gravity-driven HWT devices available on the Indian market to evaluate their performance in reducing bacteria, viruses, and protozoan surrogates in the laboratory according to World Health Organization testing protocols. Results indicated that technologies were moderately effective in reducing Escherichia coli (1.6–2.9 log10) and MS2 (1.4–2.8 log10), and less effective against Bacillus subtilis spores (0.73–2.2 log10) and 3 μm microspheres (0.33–0.56 log10), as means over the testing period (750–4,000 l). Effectiveness declined sharply over the duration of testing for each device, suggesting that the manufacturer-specified effective lifespans were overestimated for all devices. Moderate variability was observed across challenge conditions intended to represent actual use conditions, but performance was not significantly different between challenge waters or ambient testing temperature. Our results suggest that these novel devices do not meet international minimum performance recommendations and that manufacturer effectiveness claims are misleading. Further technological innovation and regulation in this sector may serve to protect public health.

scholarly journals Effects of Water Quality and Post-Harvest Handling on Microbiological Contamination of Lettuce at Urban and Peri-Urban Locations of Ouagadougou, Burkina Faso

Foods ◽  
2018 ◽  
Vol 7 (12) ◽  
pp. 206 ◽  
Author(s):  
Juliane Dao ◽  
Kathrin Stenchly ◽  
Oumar Traoré ◽  
Philip Amoah ◽  
Andreas Buerkert
Keyword(s):  
Water Quality ◽  
Irrigation Water ◽  
World Health ◽  
Vegetable Production ◽  
Salmonella Spp ◽  
Total Coliforms ◽  
E Coli ◽  
Post Harvest ◽  
Health Organization ◽  
Production Areas

Vegetable production in urban gardens of Ouagadougou contributes to food security, but water for irrigation is often of low quality. This is particularly acute if irrigation water is taken from wastewater polluted channels. This study aimed at (i) verifying to what degree irrigation water quality is correlated with contamination of lettuce with Escherichia coli, total coliforms, and Salmonella spp., and (ii) assessing effects of post-harvest handling on pathogen development during the trade chain. We tested pathogen removal efficiency on lettuce by applying post-harvest washing. Irrigation water of production areas in Ouagadougou (n = 10) showed a mean E. coli load of 2.1 × 105 CFU 100 mL−1. In 60% of the cases, irrigation water did not meet the standards of the World Health Organization (WHO) for safe irrigation water, and in 30% of the cases, irrigation water was contaminated with Salmonella spp. Loads of total coliforms on lettuce leaves ranged from 2.9 × 103 CFU g−1 to 1.3 × 106 CFU g−1, while E. coli averaged 1.1 × 102 CFU g−1. Results on post-harvest handling revealed that microbial loads increased along the trade chain. Overall, half of all lettuce samples (n = 60) were tested positively for Salmonella spp. The experiment showed that appropriate post-harvest handling could prevent the increase of total coliforms.

scholarly journals Breast Feeding versus Formula Feeding and Diarrheal Diseases in Infants and Children- A Review

2014 ◽  
Vol 32 (1) ◽  
pp. 26-30 ◽  
Author(s):  
MUH Begum
Keyword(s):  
Breast Feeding ◽  
Exclusive Breastfeeding ◽  
Diarrheal Disease ◽  
Formula Feeding ◽  
Infants And Children ◽  
World Health ◽  
Human Breast Milk ◽  
Diarrheal Diseases ◽  
Health Organization ◽  
In Infants And Children

The World Health Organization (WHO) and the American Academy of Pediatrics (AAP) emphasize the value of breastfeeding for mothers as well as children. Both recommend exclusive breastfeeding for the first six months of life. Human breast milk is the healthiest form of milk for babies. Breastfeeding promotes health and helps to prevent diseases including diarrheal diseases. It contains all nutrients including antibodies (IgA),and lactoferrin, that potentially prevent infection and diarrhea in infants and children. Studies conducted in both developed and under developed nations have found that breast feeding is associated with significantly ( upto 64%) less diarrheal disease and the protective effect of breast feeding does not persist beyond two months after breast feeding is stopped. On the other hand, formula fed infants are found an upto 80% increased in the risk of developing diarrhea compared to breast fed infants and there is significantly more diarrheal disease in formula fed infants. Infection may be attributable to contamination of bottles, teats, milk, and food in infants who are not exclusively breastfed. Exclusive breastfeeding for the first six months of life and there after complementary feedings while breastfeeding continues for up to two years of age or beyond, enthusiastic support and involvement from clinicians, obstetricians and pediatricians, are essential in “breastfeeding vs formula feeding” issue and to reduce incidence of diarrheal diseases in infants and children. DOI: http://dx.doi.org/10.3329/jbcps.v32i1.21033 J Bangladesh Coll Phys Surg 2014; 32: 26-30

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