Household Water Treatment and Safe Storage Factsheet: Source ...

More documents

Recommendations

Info

Household Water Treatment and Safe Storage Factsheet: Settling Key Data Direct Cost Capital Cost Operating Cost Replacement Cost US$0 US$0 US$0 Note: Program, transportation and education costs are not included. Costs will vary depending on location. References Sobsey, M. (2002). Managing Water in the Home: Accelerated Health Gains from Improved Water Supply. Water, Sanitation and Health, Department of Protection of the Human Environment, World Health Organization, Geneva, Switzerland. CAWST (Centre for Affordable Water and Sanitation Technology) Calgary, Alberta, Canada Website: www.cawst.org Email: cawst@cawst.org Wellness through Water.... Empowering People Globally Last Update: June 2011
Household Water Treatment and Safe Storage Factsheet: Natural Coagulants The Treatment Process Potential Treatment Capacity Very Effective For: Somewhat Effective For: Not Effective For: Turbidity Bacteria Viruses Protozoa Helminths Taste, odour, colour Dissolved chemicals What are Natural Coagulants? The sedimentation process can be quickened by adding coagulants to the water. Coagulation with extracts from natural and renewable vegetation has been widely practiced since recorded time. There is a variety of natural coagulants used around the world, depending on the availability. Extracts from the seeds of Moringa oleifera can be used, the trees of which are widely present in Africa, the Middle East and the Indian subcontinent. Strychnos potatorum, also known as clearing nuts or the nirmali tree, is found in India to treat water. Prickly pear cactus is prevalent and traditionally used in Latin America. There are also reports of other natural coagulants being used, such as fava beans. How Does it Remove Contamination? Coagulants contain significant quantities of water-soluble proteins which carry an overall positive charge when in solution. The proteins bind to the predominantly negatively charged particles that cause turbidity (e.g. sand, silt, clay). Coagulation happens when the positively and negatively charged particles are chemically attracted together. They can then accumulate (flocculation) to form larger and heavier particles (flocs). The flocs can be settled out or removed by filtration. Bacteria and viruses can attach themselves to the suspended particles in water that cause turbidity. Therefore, reducing turbidity levels through coagulation may also improve the microbiological quality of water. Moringa seed pods (Credit: www.moringanews.org)
Page 1 and 2: Household Water Treatment and Safe
Page 5: Household Water Treatment and Safe
Page 57 and 58:
Household Water Treatment and Safe
Page 59 and 60:
Page 61 and 62:
Page 63 and 64:
Page 65 and 66:
Page 67 and 68:
Page 69 and 70:
Page 71 and 72:
Page 73 and 74:
Page 75 and 76:
Page 77 and 78:
Page 79 and 80:
Page 81 and 82:
Page 83 and 84:
Page 85 and 86:
Household Water Treatment for Arsen
Page 87 and 88:
Page 89 and 90:
Page 91 and 92:
Page 93 and 94:
Page 95 and 96:
Page 97 and 98:
Page 99 and 100:
Page 101 and 102:
Page 103 and 104:
Household Water Treatment for Fluor
Page 105 and 106:
Page 107 and 108:
Page 109 and 110:
Page 111 and 112:
Page 113 and 114:
Page 115 and 116:
Page 117 and 118:
Page 119 and 120:
Page 121:
show all

Household Water Treatment and Safe Storage Factsheet: Source ...

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?