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Tuesday February 16th 2010 Richard Wilson Mallinckrodt Research Professor of Physics

This article discusses the challenges of providing safe drinking water in Bangladesh and proposes solutions such as deep aquifers, household water treatment, and surface water sources. It also highlights the importance of proper maintenance and sanitation practices for long-term sustainability.

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Tuesday February 16th 2010 Richard Wilson Mallinckrodt Research Professor of Physics

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  1. Tuesday February 16th 2010 Richard Wilson Mallinckrodt Research Professor of Physics Harvard University Completion and sustaining safe drinking water in Bangladesh http://arsenic.ws http://physics.harvard.edu/~wilson/arsenic/ arsenic_project_introduction.html

  2. Nuclear PhysicsHigh energy particle physicsProton RadiotherapyRisk AnalysisNuclear Reactor safetyChemical Carcinogens animal/man comparisonEnergy and environment problemsWhat not to do about climate changeResponses to terrorist Risks

  3. DYSPIGMENTATION KERATOSIS GANGRENE BOWEN”S CARCINOMA

  4. 1982: R.C Saha observed keratoses and dyspigmentation in West Bengal -IGNORED1995 DCH physicians saw lesions in Bangladesh.30,000,000 drinking water with >50 ppb arsenicACTION BEGAN in 1998(1) Use uncontaminated deep aquifer(2) Treat the water at household level (3) return to surface watersALL WILL WORKEach has different problems of sustainability

  5. Replacing water Well switchingonly 30% of tube wells contaminatedBUT80% in some villages Deep tube wellsDhaka uses thesenot so good in Jessore

  6. Removing arsenic:This seems first choice of many people by town by village by householdCan it be maintained?

  7. In 1965 Dipenkar Chakriborti reported that 70% of household filters in West Bengal were abandonedNGOs bought themgave them to villagersand walked awayVillagers could not cope

  8. When there is a local group it works better (Abul Munir of Kushtia and SONO filter)but now overloadedVillage size units can educate a caretaker for 1000 peopleDas Gupta West BengalSIDDKO

  9. Surface water GoB policy in 2003yet no emphasis on sanitationICDDR’B said nothingAdopted by Dhaka Community HospitalDugwellsRiver Sand filtersPond Sand filtersRainwater collection

  10. Electrically pumped to tank (R) Sanitary well: no animals fall in no buckets! (L) Lady has running water for first time in history

  11. Piped water system very popular among women who carry the waterEnables more families to be served by one well.Large (INDARA) wells can serve 50 families(1) Maintenance cost spread(2) Large size ensures oxidization and inhibits arsenic release(3) Easier to keep free of bacteriaBut electricty only on twice a day because of cost

  12. Faecal coliform coun/ 100 ml No. of days after chlorination >10 after 23 days and reached from 35 to 180+ in the water samples of all dugwells at the end of the month. Fig 1: Faecal coliforms count in water samples of 10 dugwells (DW2, DW3, DW6, DW7, DW8, DW10, DW21, DW29, DW34, and DW66) of Pabna district in the month of July.

  13. Chlorination method of DCH:Shock ChlorinationDoes not work for flooded tube wells. (Luby, Johnston 2006)Works for sufcae dugwellsBUT CHLORINE TASTE IS NOT GOODAbout 0.5 mg/Liter1/50 of that used by DCH for shock treatmentIn last 10 years we have lots of measurements

  14. BUTlow level daily chlorination does not work in a dugwell. Sides and bottom soak up chlorineShould work in overhead tank and in last box of river sand filtersI propose to study this in the next year

  15. I know of no one who drinks Dhaka or Pabna water without boilingYETI am happy to drink RSF or dugwell waterBut I would still like to have it verifiable by a cheap field test

  16. A lot of work on Chlorination at Point of UseKarachi, Zambia, Kenya, and Boliviavey polluted wells but diarhea reducedCost less than bottled water

  17. MY recommendation for BangladeshIf deep tube wellsONLY FOR HOUSEHOLD: NEVER FOR IRRIGATIONUse surface waters for irrigationONLY build to WHO standards (DCH) River water filtersPond sand fiktersDugwellsChlorine (household bleach every week in summerUse piped water system; it leads to the long termemphasize large systems:Indara wells

  18. ALL DCH tests are on the web at:http://DCHTests.arsenic.wshttp://physics.harvard.edu/~wilson/arsenic/remediation/dugwells/DCHtestsSome project well tests also:

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