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This project will focus on methods to decrease turbidity in source water prior to treatment by solar water disinfection (SODIS). It is based on preliminary experiments performed for the design of a low-cost filter unit for pre-SODIS treatment. This new study explores the use of a natural agent to facilitate coagulation-flocculation and settling of particles.

Full article

Brittney Dawney and Joshua M. Pearce, "Optimizing the solar water disinfection (SODIS) method by decreasing turbidity with NaCl", Journal of Water, Sanitation and Hygiene for Development 2(2) pp. 87-94 (2012). DOI Open access

Abstract

Solar water disinfection (SODIS) has proven to be effective at reducing diarrheal incidence in epidemiological intervention studies. However, the SODIS method is limited to waters of low turbidity (<30 NTU). This study investigates the use of common table salt (NaCl) to reduce the turbidity of water containing suspended colloidal clay particles for use in the SODIS method. Three representative clays found in tropical soils (kaolinite, illite and bentonite) were tested at three levels of turbidity (50, 100 and 200 NTU) for their flocculating behavior with multiple NaCl concentrations to find the optimum. Supernatants were tested for sodium concentration for comparison against health and taste thresholds. Results show that unlike kaolinite and illite, pure bentonite solutions were shown to be very responsive to NaCl and produced supernatants with as low as 4 NTU (98% particle removal efficiency). This study has shown that NaCl, in combination with high-activity clay particles in solution, may effectively reduce turbidity to levels suitable for SODIS treatment, thereby expanding the number of people who can utilize the technology effectively.

Background

Over a billion people around the world do not have access to clean, safe drinking water and over 2.4 billion people do not have access to water for sanitation purposes. This puts these people - who are concentrated in the global south - at risk for waterborne diseases as a result of enteric microbial content. These pathogenic viruses, bacteria, and parasites (largely of fecal origin) are considered one of the biggest threats to human health in developing countries.

Over 4 billion cases of diarrhea occur annually as a result of waterborne diseases. Diarrhea causes 4% of the world's deaths and is the leading cause of death among children under the age of five. Other diseases, such as trachoma - the leading cause of blindness in developing countries - are rampant as a result of inadequate sanitation.

All of this calls for access to clean water for drinking and sanitation purposes. The World Health Organization, the United Nations, and Red Cross all advocate for the implementation of low-cost treatment at the household level as a means of providing water that is free of the enteric microbes associated with waterborne diseases. By providing safe water alone, diarrheal and other enteric diseases can be reduced by 6 to 50%; the challenge remains in offering simple, sustainable treatment methods that are appropriate for the user at the household level.

Treatment of water by solar water disinfection (SODIS) has been tested in both epidemiological and microbiological studies and is considered an appropriate technology for treatment of water at the household level. The combination of ultraviolet radiation and heat is highly effective at disinfecting water, though the technology is significantly limited to clear water (turbidity of <30 NTU). For the considerably large number of people who collect water from sources affected by overland flow, erosion, and pollution, SODIS is not a viable treatment option. There is therefore significant need for a method to reduce turbidity prior to solar treatment for efficient inactivation of microbes.

Project

An effective method to reduce turbidity has the potential to appreciably increase the number of people with access to SODIS treatment. This study is focused on providing a simple, low-cost method of reducing turbidity of source water prior to SODIS treatment.

Open access to full results of study 1

The second study will measure the effectiveness of natural coagulants on a variety of soil media in water. Availability of materials will be considered a strong determinant in the viability of treatment. Global soil distribution and solar energy potential will be considered in determining which areas of the world will benefit most from this type of treatment.

The following is a time lapse video of the settling of a suspended solution of bentonite clay at an initial turbidity of 200 NTU, with 0.01M, 0.05M, and 0.1M NaCl (Jars 3, 4, 5, respectively). Settling shown occurred over 60 minutes. Recorded February 16, 2011.

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Future work

Can use this method to treat water for discharge. Make work for fresh water if under limits - but this turbidity treatment method; if the receiving water body is an ocean then we have no limits on the sodium, chloride, or Total Dissolved Solids in the treated water, so this treatment method for most sites near the ocean is acceptable. For inland receiving waterbodies, like creeks, rivers, lakes or storm drain systems that are considered “fresh” water receiving waterbodies there are limits on Total Dissolved Solids, Sodium and Chlorides that are pretty low, from about 500 mg/L TDS and 120 mg/L chlorides so we would not use this method for removing the sodium chloride requires a RO system...or perhaps look at other salts.

Media

Clean Drinking Water for Everyone - Michigan Tech News
- Clean drinking water for everyone Phys.org
- Reddit
Simple way to remove mud from drinking water - Science Daily
Clean Drinking Water For Everyone Even From Muddy Water Before It Is News
Optimizing the Solar Water Disinfection (SODIS) Method by DecreasingTurbidity with NaCl WASHplus Blog
A New, Simple Way to Purify Drinking Water in Developing Countries - Newswise
Keukenzout maakt drinkwater helder en beter desinfecteerbaar C2W (Dutch)
Magic of Salt: Clear Muddy Water - Nerdy Science Blog
Common Kitchen Ingredient Helps Clean Drinking Water - Treehugger
Una manera sencilla de quitar el barro del agua potable: Enfermedades en los países en desarrollo está vinculado a agua de mala calidad... - Datoanuncios.org (Spanish)
New method can make even muddy water safe for drinking - ANI (India)
Clean drinking water for everyone, everywhere - Homeland Security Newswire
Michigan Tech Prof Develops New Way of Purifying Drinking Water - Lab Manager Magazine
Purifying Murky Drinking Water - Aqualog - Wisconsin's Water Library
Simple Way to Remove Mud from Drinking Water - Water Spouts Blog
New method can make even muddy water safe for drinking - Web India
Abordagem utiliza sal e radiação solar para tornar água segura para consumo -Isaude
Keukenzout maakt modderwater drinkbaar - ZapLog (Dutch)
New method can make even muddy water safe for drinking - India Vision
Salz macht trübes Wasser trinkbar - Wissenschaft Aktuell (Science News Germany)
Simple Way to Remove Mud from Drinking Water - Eng tips
Técnica utiliza luz solar e sal para tornar água própria para o consumo - Correio Braziliense (Portugese)
Simple Way to Purify Water in Developing Countries -Michigan Ag Connection
Разработан простой и дешевый способ очистки воды - CHEMRAR-Russia
[1]
This Guy Is Making Dirty Water Safe To Drink By Using A Common Kitchen Ingredient - The Business Insider
Recipe For Safer Drinking Water? Add Sun, Salt And Lime NPR
We drink safe water -- China
Table salt key in treating unsafe drinking water: Queen's University study - Queens U. News
Table Salt Discovered to be Key in Water Purification Method - Kingston Herald
A gram of salt helps treat murky water - CBC News
To Disinfect Water Cheaply, Just Add Sunlight (and Salt or Lime Juice) - Discover Magazine - 80 Beats blog
Solar Disinfection Method Clears Muddy Water - Enviro News
A gram of salt helps treat murky water - Yahoo News India
Purifying Drinking Water with Sun, Salt and Limes - Environmental Health Perspectives Aug. 2012
Simple Way to Remove Mud from Drinking Water -- GhanaWeb
Common Kitchen Ingredient Helps Clean Drinking Water- Water Guide
Innovations in Water Purification - How Stuff Works
Simple Methods May Help Bring Clean Water To Developing Countries - Green Building Elements, Sustainable Cities Collective
Sonne reinigt Wasser - Technology Review (German)
Green Ways to Clean Water for Drinking- Green Tumble

@@ Line 1: / Line 1: @@
+{{MOST}}
 {{QASpage}}
-This project will focus on methods to decrease turbidity in source water prior to treatment by solar water disinfection ([http://www.sodis.ch/methode/index_EN| SODIS]).  It is based on preliminary experiments performed for the [[Design_of_a_low-cost_SODIS_water_treatment_unit|design of a low-cost filter unit for pre-SODIS treatment]].  This new study will explore the use of a natural agent to facilitate coagulation-flocculation and settling of particles.
+<center>{{#widget:YouTube|id=XF0DNdYASkM}}</center>
+This project will focus on methods to decrease turbidity in source water prior to treatment by solar water disinfection ([http://www.sodis.ch/methode/index_EN| SODIS]).  It is based on preliminary experiments performed for the [[Design_of_a_low-cost_SODIS_water_treatment_unit|design of a low-cost filter unit for pre-SODIS treatment]]. This new study explores the use of a natural agent to facilitate coagulation-flocculation and settling of particles.
+=Full article=
+Brittney Dawney and Joshua M. Pearce, "Optimizing the solar water disinfection (SODIS) method by decreasing turbidity with NaCl", ''Journal of Water, Sanitation and Hygiene for Development'' 2(2) pp. 87-94 (2012). [http://dx.doi.org/10.2166/washdev.2012.043 DOI]
+[http://mtu.academia.edu/JoshuaPearce/Papers/1590504/Optimizing_the_solar_water_disinfection_SODIS_method_by_decreasing_turbidity_with_NaCl Open access]
+==Abstract==
+[[image:Sodis.jpg|left]]Solar water disinfection ([[SODIS]]) has proven to be effective at reducing diarrheal incidence in epidemiological intervention studies. However, the SODIS method is limited to waters of low turbidity (<30 NTU). This study investigates the use of common table salt ([[NaCl]]) to reduce the turbidity of water containing suspended colloidal clay particles for use in the SODIS method. Three representative clays found in tropical soils (kaolinite, illite and bentonite) were tested at three levels of turbidity (50, 100 and 200 NTU) for their flocculating behavior with multiple NaCl concentrations to find the optimum. Supernatants were tested for sodium concentration for comparison against health and taste thresholds. Results show that unlike kaolinite and illite, pure bentonite solutions were shown to be very responsive to NaCl and produced supernatants with as low as 4 NTU (98% particle removal efficiency). This study has shown that NaCl, in combination with high-activity clay particles in solution, may effectively reduce turbidity to levels suitable for SODIS treatment, thereby expanding the number of people who can utilize the technology effectively.
 ==Background==
-Over a billion people around the world do not have access to clean, safe drinking water and over 2.4 billion people do not have access to water for sanitation purposes. This puts these people  - who are concentrated in the global south - at risk for waterborne diseases as a result of enteric microbial content.  These pathogenic viruses, bacteria, and parasites (largely of fecal origin) are considered one of the biggest threats to human health in developing countries.
+Over a billion people around the world do not have access to clean, safe drinking [[water]] and over 2.4 billion people do not have access to water for [[sanitation]] purposes. This puts these people  - who are concentrated in the global south - at risk for waterborne diseases as a result of enteric microbial content.  These pathogenic viruses, bacteria, and parasites (largely of fecal origin) are considered one of the biggest threats to human health in developing countries.
 <br>
 <br>
@@ Line 10: / Line 20: @@
 <br>
 <br>
-All of this calls for access to clean water for drinking and [[sanitation]] purposes. The World Health Organization, the United Nations, and Red Cross all advocate for the implementation of low-cost treatment at the household level as a means of providing water that is free of the enteric microbes associated with waterborne diseases.  By providing safe water alone, diarrheal and other enteric diseases can be reduced by 6 to 50%; the challenge remains in offering simple, sustainable treatment methods that are appropriate for the user at the household level.
+All of this calls for access to clean water for drinking and sanitation purposes. The World Health Organization, the United Nations, and Red Cross all advocate for the implementation of low-cost treatment at the household level as a means of providing water that is free of the enteric microbes associated with waterborne diseases.  By providing safe water alone, diarrheal and other enteric diseases can be reduced by 6 to 50%; the challenge remains in offering simple, sustainable treatment methods that are appropriate for the user at the household level.
 <br>
 <br>
@@ Line 16: / Line 26: @@
 ==Project==
-An effective method to reduce turbidity has the potential to appreciably increase the number of people with access to SODIS treatment.  This study is focused on providing a simple, low-cost method of reducing turbidity of source water prior to SODIS treatment.  This study will measure the effectiveness of natural coagulants on a variety of soil media in water.  Availability of materials will be considered a strong determinant in the viability of treatment.  Global soil distribution and solar energy potential will be considered in determining which areas of the world will benefit most from this type of treatment.
+An effective method to reduce turbidity has the potential to appreciably increase the number of people with access to SODIS treatment.  This study is focused on providing a simple, low-cost method of reducing turbidity of source water prior to SODIS treatment.
+* [http://mtu.academia.edu/JoshuaPearce/Papers/1590504/Optimizing_the_solar_water_disinfection_SODIS_method_by_decreasing_turbidity_with_NaCl Open access to full results of study 1]
+The second study will measure the effectiveness of natural coagulants on a variety of soil media in water.  Availability of materials will be considered a strong determinant in the viability of treatment.  Global soil distribution and solar energy potential will be considered in determining which areas of the world will benefit most from this type of treatment.
+<br>
+<br>
+'''The following is a time lapse video of the settling of a suspended solution of bentonite clay at an initial turbidity of 200 NTU, with 0.01M, 0.05M, and 0.1M NaCl (Jars 3, 4, 5, respectively). Settling shown occurred over 60 minutes.  Recorded February 16, 2011.'''
+<br>
+<center>{{#widget:YouTube|id=rrYF1ehC0pY}}</center>
 ==See also==
-[[Literature Review: Decreasing turbidity to optimize solar water disinfection]]<br>
+* [[Literature Review: Decreasing turbidity to optimize solar water disinfection]]<br>
-[[Coagulation-flocculation jar test protocol]]
+* [[Coagulation-flocculation jar test protocol]]
+* [[Protocol for measuring metals content in water]]
+* [[Evaluating the Geographic Viability of the Solar Water Disinfection (SODIS) Method by Decreasing Turbidity with NaCl: A Case Study of South Sudan]]
+* Main SODIS website: http://www.sodis.ch/index_EN
+==Future work ==
+* Can use this method to treat water for discharge. Make work for fresh water if under limits - but this turbidity treatment method; if the receiving water body is an ocean then we have no limits on the sodium, chloride, or Total Dissolved Solids in the treated water, so this treatment method for most sites near the ocean is acceptable.  For inland receiving waterbodies, like creeks, rivers, lakes or storm drain systems that are considered “fresh” water receiving waterbodies there are limits on Total Dissolved Solids, Sodium and Chlorides that are pretty low, from about 500 mg/L TDS and 120 mg/L chlorides so we would not use this method for removing the sodium chloride requires a RO system...or perhaps look at other salts.
+== Media ==
+* [http://www.mtu.edu/news/stories/2012/april/story67534.html Clean Drinking Water for Everyone] - Michigan Tech News
+** [http://phys.org/news/2012-05-clean-drinking-water-for-everyone.html Clean drinking water for everyone] Phys.org
+** [http://www.reddit.com/r/Health/comments/t1e8t/nearly_80_percent_of_disease_in_developing/ Reddit]
+* [http://www.sciencedaily.com/releases/2012/05/120501134315.htm Simple way to remove mud from drinking water] - Science Daily
+* [http://beforeitsnews.com/story/2083/171/Clean_Drinking_Water_For_Everyone_Even_From_Muddy_Water.html Clean Drinking Water For Everyone Even From Muddy Water] Before It Is News
+* [http://blogs.washplus.org/drinkingwaterupdates/ Optimizing the Solar Water Disinfection (SODIS) Method by DecreasingTurbidity with NaCl] WASHplus Blog
+* [http://www.newswise.com/articles/a-new-simple-way-to-purify-drinking-water-for-people-in-developing-countries A New, Simple Way to Purify Drinking Water in Developing Countries] - Newswise
+* [http://www.c2w.nl/liever-brak-dan-aan-de-racekak.256570.lynkx Keukenzout maakt drinkwater helder en beter desinfecteerbaar] C2W (Dutch)
+* [http://science.kukuchew.com/2012/05/02/2270/ Magic of Salt: Clear Muddy Water] - Nerdy Science Blog
+* [http://www.treehugger.com/clean-water/kitchen-ingredient-clean-drinking-water.html Common Kitchen Ingredient Helps Clean Drinking Water] - Treehugger
+* [http://www.datoanuncios.org/?a=37352 Una manera sencilla de quitar el barro del agua potable: Enfermedades en los países en desarrollo está vinculado a agua de mala calidad...] - Datoanuncios.org (Spanish)
+* [http://www.aninews.in/newsdetail9/story48978/new-method-can-make-even-muddy-water-safe-for-drinking.html New method can make even muddy water safe for drinking] - ANI (India)
+* [http://www.homelandsecuritynewswire.com/dr20120501-clean-drinking-water-for-everyone-everywhere Clean drinking water for everyone, everywhere] - Homeland Security Newswire
+* [http://www.labmanager.com/?articles.view/articleNo/7535/article/Michigan-Tech-Prof-Develops-New-Way-of-Purifying-Drinking-Water Michigan Tech Prof Develops New Way of Purifying Drinking Water] - Lab Manager Magazine
+* [http://aqualog2.blogspot.com/2012/05/purifying-murky-drinking-water.html Purifying Murky Drinking Water] - Aqualog - Wisconsin's Water Library
+* [http://water-spouts.blogspot.com/2012/05/simple-way-to-remove-mud-from-drinking.html Simple Way to Remove Mud from Drinking Water] - Water Spouts Blog
+* [http://news.webindia123.com/news/Articles/India/20120502/1976881.html New method can make even muddy water safe for drinking ] - Web India
+* [http://www.isaude.net/pt-BR/noticia/27453/saude-publica/abordagem-utiliza-sal-e-radiacao-solar-para-tornar-agua-segura-para-consumo Abordagem utiliza sal e radiação solar para tornar água segura para consumo  ] -Isaude
+* [http://zaplog.nl/zaplog/article/keukenzout_maakt_modderwater_drinkbaar Keukenzout maakt modderwater drinkbaar   ] - ZapLog (Dutch)
+* [http://www.indiavision.com/news/article/scitech/302199/new-method-can-make-even-muddy-water-safe-for-drinking/ New method can make even muddy water safe for drinking ] - India Vision
+* [http://www.wissenschaft-aktuell.de/artikel/Salz_macht_truebes_Wasser_trinkbar1771015588440.html Salz macht trübes Wasser trinkbar ] - Wissenschaft Aktuell (Science News Germany)
+* [http://eng-tips.nethawk.net/blog/simple-way-to-remove-mud-from-drinking-water Simple Way to Remove Mud from Drinking Water] - Eng tips
+* [http://www.correiobraziliense.com.br/app/noticia/tecnologia/2012/05/04/interna_tecnologia,300799/tecnica-utiliza-luz-solar-e-sal-para-tornar-agua-propria-para-o-consumo.shtml Técnica utiliza luz solar e sal para tornar água própria para o consumo] - Correio Braziliense (Portugese)
+* [http://www.michiganagconnection.com/story-state.php?Id=344&yr=2012 Simple Way to Purify Water in Developing Countries ] -Michigan Ag Connection
+* [http://www.chemrar.ru/i-news/index.php?ELEMENT_ID=13815  Разработан простой и дешевый способ очистки воды] - CHEMRAR-Russia
+* [http://m.medindia.net/news/news.asp?id=100953 ]
+* [http://www.businessinsider.com/clean-drinking-water-using-table-salt-2012-5 This Guy Is Making Dirty Water Safe To Drink By Using A Common Kitchen Ingredient] - The Business Insider
+* [http://www.npr.org/blogs/thesalt/2012/05/07/152206711/recipe-for-safer-drinking-water-add-sun-salt-and-lime Recipe For Safer Drinking Water? Add Sun, Salt And Lime] NPR
+* [http://www.langge.net/toefl/read/20120503100352.html We drink safe water ]  -- China
+* [http://www.queensu.ca/news/articles/table-salt-key-treating-unsafe-drinking-water-queens-university-study Table salt key in treating unsafe drinking water: Queen's University study] - Queens U. News
+* [http://kingstonherald.com/tech/table-salt-water-purification-201038759 Table Salt Discovered to be Key in Water Purification Method] - Kingston Herald
+* [http://www.cbc.ca/news/technology/story/2012/05/17/salt-water-treatment-solar-disinfection-study.html A gram of salt helps treat murky water] - CBC News
+* [http://blogs.discovermagazine.com/80beats/2012/05/16/to-disinfect-water-cheaply-just-add-sunlight-and-salt-or-lime-juice/ To Disinfect Water Cheaply, Just Add Sunlight (and Salt or Lime Juice)] - Discover Magazine - 80 Beats blog
+* [http://www.enviro-news.com/news/solar-disinfection-method-clears-muddy-water.html Solar Disinfection Method Clears Muddy Water] - Enviro News
+* [http://in.news.yahoo.com/solar-water-disinfection-method-promises-clean-water-everyone-072807842.html A gram of salt helps treat murky water] - Yahoo News India
+* [http://ehp03.niehs.nih.gov/article/info%3Adoi%2F10.1289%2Fehp.120-a305 Purifying Drinking Water with Sun, Salt and Limes] - ''Environmental Health Perspectives'' Aug. 2012
+* [http://www.ghanaweb.com/GhanaHomePage/features/artikel.php?ID=257519 Simple Way to Remove Mud from Drinking Water] -- GhanaWeb
+* [http://waterguide.org/featured/common-kitchen-ingredient-helps-clean-drinking-water/ Common Kitchen Ingredient Helps Clean Drinking Water]- Water Guide
+* [http://science.howstuffworks.com/environmental/green-tech/sustainable/10-innovations-water-purification6.htmn10 Innovations in Water Purification] - How Stuff Works
+* [http://greenbuildingelements.com/2013/05/07/simple-methods-may-help-bring-clean-water-to-developing-countries/ Simple Methods May Help Bring Clean Water To Developing Countries] - Green Building Elements, [http://sustainablecitiescollective.com/grmeyers/149201/simple-methods-may-help-bring-clean-water-developing-countries Sustainable Cities Collective]
+* [http://www.heise.de/tr/artikel/Sonne-reinigt-Wasser-2074512.html Sonne reinigt Wasser] - Technology Review (German)
+* [http://greentumble.com/green-ways-to-clean-water-for-drinking/ Green Ways to Clean Water for Drinking]- Green Tumble
-[[Category:Queens Applied Sustainability Group]]
+[[Category:MOST completed projects and publications]]
+[[Category:QAS completed projects and publications]]
+[[Category:Water_purification]]
+[[Category:Water_and_sanitation_for_developing_countries]]
+[[Category:International_development]]
+[[Category:Videos]]
+[[Category:Health and safety videos]]
+[[Category:Water videos]]

Decreasing turbidity to optimize solar water disinfection: Difference between revisions