scholarly journals Turbidity and chlorine demand reduction using alum and moringa flocculation before household chlorination in developing countries

2009 ◽  
Vol 8 (1) ◽  
pp. 60-70 ◽  
Author(s):  
Kelsey Preston ◽  
Daniele Lantagne ◽  
Nadine Kotlarz ◽  
Kristen Jellison
Keyword(s):  
Developing Countries ◽  
Disease Incidence ◽  
Water System ◽  
Diarrhoeal Disease ◽  
Water Disinfection ◽  
Waterborne Diseases ◽  
Household Water Treatment ◽  
Turbid Waters ◽  
Chlorine Demand ◽  
Water Treatments

Over 1.1 billion people in the world lack access to improved drinking water. Diarrhoeal and other waterborne diseases cause an estimated 1.87 million deaths per year. The Safe Water System (SWS) is a household water treatment intervention that reduces diarrhoeal disease incidence among users in developing countries. Turbid waters pose a particular challenge to implementation of SWS programmes; although research shows that a 3.75 mg l−1 sodium hypochlorite dose effectively treats turbid waters, users sometimes object to the strong chlorine taste and prefer to drink water that is more aesthetically pleasing. This study investigated the efficacy of two locally available chemical water treatments—alum and Moringa oleifera flocculation—to reduce turbidity and chlorine demand at turbidities of 10, 30, 70, 100 and 300 NTU. Both treatments effectively reduced turbidity (alum flocculation 23.0–91.4%; moringa flocculation 14.2–96.2%). Alum flocculation effectively reduced chlorine demand compared with controls at 30, 70, 100 and 300 NTU (p=0.01–0.06). Moringa flocculation increased chlorine demand to the point where adequate free chlorine residual was not maintained for 24 hours after treatment. Alum pretreatment is recommended in waters≥30 NTU for optimum water disinfection. Moringa flocculation is not recommended before chlorination.

scholarly journals Turbidity and chlorine demand reduction using locally available physical water clarification mechanisms before household chlorination in developing countries

2009 ◽  
Vol 7 (3) ◽  
pp. 497-506 ◽  
Author(s):  
Nadine Kotlarz ◽  
Daniele Lantagne ◽  
Kelsey Preston ◽  
Kristen Jellison
Keyword(s):  
Developing Countries ◽  
Disease Incidence ◽  
Water System ◽  
Diarrhoeal Disease ◽  
Waterborne Diseases ◽  
Sand Filtration ◽  
Household Water Treatment ◽  
Turbid Waters ◽  
Household Water ◽  
Chlorine Demand

Over 1.1 billion people in the world lack access to improved drinking water. Diarrhoeal and other waterborne diseases cause an estimated 1.9 million deaths per year. The Safe Water System (SWS) is a proven household water treatment intervention that reduces diarrhoeal disease incidence among users in developing countries. Turbid waters pose a particular challenge to implementation of SWS programmes; although research shows that a 3.75 mg l−1 sodium hypochlorite dose effectively treats turbid waters, users sometimes object to the strong chlorine taste and prefer to drink water that is more aesthetically pleasing. This study investigated the efficacy of three locally available water clarification mechanisms—cloth filtration, settling/decanting and sand filtration—to reduce turbidity and chlorine demand at turbidities of 10, 30, 70, 100 and 300 NTU. All three mechanisms reduced turbidity (cloth filtration −1–60%, settling/decanting 78–88% and sand filtration 57–99%). Sand filtration (P=0.002) and settling/decanting (P=0.004), but not cloth filtration (P=0.30), were effective at reducing chlorine demand compared with controls. Recommendations for implementing organizations based on these results are discussed.

Excystation ofCryptosporidium parvumat temperatures that are reached during solar water disinfection

Parasitology ◽  
2009 ◽  
Vol 136 (4) ◽  
pp. 393-399 ◽  
Author(s):  
H. GÓMEZ-COUSO ◽  
M. FONTÁN-SAINZ ◽  
J. FERNÁNDEZ-ALONSO ◽  
E. ARES-MAZÁS
Keyword(s):  
Solar Radiation ◽  
Cryptosporidium Parvum ◽  
Gradual Increase ◽  
Water Disinfection ◽  
Waterborne Diseases ◽  
Pathogenic Microorganisms ◽  
Simple Method ◽  
Solar Water ◽  
Solar Water Disinfection ◽  
Notable Increase

SUMMARYSpecies belonging to the generaCryptosporidiumare recognized as waterborne pathogens. Solar water disinfection (SODIS) is a simple method that involves the use of solar radiation to destroy pathogenic microorganisms that cause waterborne diseases. A notable increase in water temperature and the existence of a large number of empty or partially excysted (i.e. unviable) oocysts have been observed in previous SODIS studies with water experimentally contaminated withCryptosporidium parvumoocysts under field conditions. The aim of the present study was to evaluate the effect of the temperatures that can be reached during exposure of water samples to natural sunlight (37–50°C), on the excystation ofC. parvumin the absence of other stimuli. In samples exposed to 40–48°C, a gradual increase in the percentage of excystation was observed as the time of exposure increased and a maximum of 53·81% of excystation was obtained on exposure of the water to a temperature of 46°C for 12 h (versus8·80% initial isolate). Under such conditions, the oocyst infectivity evaluated in a neonatal murine model decreased statistically with respect to the initial isolate (19·38%versus100%). The results demonstrate the important effect of the temperature on the excystation ofC. parvumand therefore on its viability and infectivity.

Paralytic Ileus, a Serious Complication in Acute Diarrhoeal Disease among Infants in Developing Countries

1989 ◽  
Vol 78 (5) ◽  
pp. 701-705 ◽  
Author(s):  
A. MURTAZA ◽  
S. R. KHAN ◽  
K. S. BUTT ◽  
Y. FINKEL ◽  
A. APERIA
Keyword(s):  
Developing Countries ◽  
Paralytic Ileus ◽  
Diarrhoeal Disease

scholarly journals Cost and financial sustainability of a household-based water treatment and storage intervention in Zambia

2007 ◽  
Vol 5 (3) ◽  
pp. 385-394 ◽  
Author(s):  
Anyana Banerjee ◽  
Deborah A. McFarland ◽  
Ritu Singh ◽  
Robert Quick
Keyword(s):  
Water Treatment ◽  
Water System ◽  
Financial Loss ◽  
Household Water Treatment ◽  
Safe Water ◽  
Start Up ◽  
Household Water ◽  
Before And After ◽  
Program Costs ◽  
And Behavior

Providing safe water to >1 billion people in need is a major challenge. To address this need, the Safe Water System (SWS) - household water treatment with dilute bleach, safe water storage, and behavior change - has been implemented in >20 countries. To assess the potential sustainability of the SWS, we analyzed costs in Zambia of “Clorin” brand product sold in bottles sufficient for a month of water treatment at a price of $0.09. We analyzed production, marketing, distribution, and overhead costs of Clorin before and after sales reached nationwide scale, and analyzed Clorin sales revenue. The average cost per bottle of Clorin production, marketing and distribution at start-up in 1999 was $1.88 but decreased by 82% to $0.33 in 2003, when >1.7 million bottles were sold. The financial loss per bottle decreased from $1.72 in 1999 to $0.24 in 2003. Net program costs in 2003 were $428,984, or only $0.04 per person-month of protection. A sensitivity analysis showed that if the bottle price increased to $0.18, the project would be self-sustaining at maximum capacity. This analysis demonstrated that efficiencies in the SWS supply chain can be achieved through social marketing. Even with a subsidy, overall program costs per beneficiary are low.

scholarly journals Feast and famine: Socioeconomic disparities in global nutrition and health

1998 ◽  
Vol 1 (1) ◽  
pp. 23-31 ◽  
Author(s):  
I Darnton-Hill ◽  
ET Coyne
Keyword(s):  
Developing Countries ◽  
Young Children ◽  
Low Income ◽  
Disease Incidence ◽  
Protein Energy Malnutrition ◽  
Sub Saharan Africa ◽  
Socioeconomic Disparities ◽  
Differential Mortality ◽  
Nutrition And Health ◽  
Global Nutrition

AbstractObjective:To review current information on under- and over-malnutrition and the consequences of socioeconomic disparities on global nutrition and health.Design:Malnutrition, both under and over, can no longer be addressed without considering global food insecurity, socioeconomic disparity, both globally and nationally, and global cultural, social and epidemiological transitions.Setting:The economic gap between the more and less affluent nations is growing. At the same time income disparity is growing within most countries, both developed and developing. Concurrently, epidemiological, demographic and nutrition transitions are taking place in many countries.Results:Fully one-third of young children in the world's low-income countries are stunted because of malnutrition. One-half of all deaths among young children are, in part, a consequence of malnutrition. Forty per cent of women in the developing world suffer from iron deficiency anaemia, a major cause of maternal mortality and low birth weight infants. Despite such worrying trends, there have been significant increases in life expectancy in nearly all countries of the world, and continuing improvements in infant mortality rates. The proportion of children malnourished has generally decreased, although actual numbers have not in sub-Saharan Africa and south Asia. Inequalities are increasing between the richest developed countries and the poorest developing countries. Social inequality is an important factor in differential mortality in both developed and developing countries. Many countries have significant pockets of malnutrition and increased mortality of children, while obesity and non-communicable disease (NCDs) prevalences are increasing. Not infrequently it is the poor and relatively disadvantaged sectors of the population who are suffering both. In the industrialized countries. cardiovascular disease incidence has declined, but less so in the poorer socioeconomic strata.conclusions:The apparent contradicitions found represent a particular point in time (population responses generally lag behind social and environmental transitions). They do also show encouraging evidence that interventions can have a positive impact, sometimes despite disadvantageous circumstances. However, it seems increasingly unlikely that food production will continue to keep up with population growth. It is also unlikely present goals for reducing protein-energy malnutrition prevalence will be reached. The coexistence of diseases of undernutrition and NCDs will have an impact on allocation of resources. Action needs to be continued and maintained at the international, national and individual level.

Waterborne Diseases and Climate Change: Impact and Implications

2018 ◽  
pp. 469-484
Author(s):  
Maha Bouzid
Keyword(s):  
Climate Change ◽  
Developing Countries ◽  
Disease Transmission ◽  
Waterborne Diseases ◽  
Vector Borne Diseases ◽  
Significant Burden ◽  
Change Impact ◽  
Vector Borne ◽  
The Impact ◽  
Adaptation Options

Waterborne diseases are caused by a multitude of pathogens and associated with a significant burden in both developed and developing countries. While the assessment of the adverse impacts of climate change on human heath from infectious diseases has mainly focused on vector-borne diseases, waterborne diseases prevalence and transmission patterns are also likely to be impacted by environmental change. This chapter will outline relevant waterborne pathogens, summarise the impact of climate change on disease transmission and explore climate change adaptation options in order to reduce the increased burden of waterborne diseases.

Waterborne Diseases and Climate Change

2017 ◽  
pp. 1041-1055
Author(s):  
Maha Bouzid
Keyword(s):  
Climate Change ◽  
Developing Countries ◽  
Disease Transmission ◽  
Waterborne Diseases ◽  
Waterborne Pathogens ◽  
Vector Borne Diseases ◽  
Significant Burden ◽  
Vector Borne ◽  
The Impact ◽  
Adaptation Options

Waterborne diseases are caused by a multitude of pathogens and associated with a significant burden in both developed and developing countries. While the assessment of the adverse impacts of climate change on human heath from infectious diseases has mainly focused on vector-borne diseases, waterborne diseases prevalence and transmission patterns are also likely to be impacted by environmental change. This chapter will outline relevant waterborne pathogens, summarise the impact of climate change on disease transmission and explore climate change adaptation options in order to reduce the increased burden of waterborne diseases.

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