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7/29/2019 Brass for Purification of Water in Rural India
http://slidepdf.com/reader/full/brass-for-purification-of-water-in-rural-india 1/50
Brass (and copper) containers forpurification of water in rural India
Rob Reed,Division of Biomedical Sciences,
Northumbria University
7/29/2019 Brass for Purification of Water in Rural India
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Outline:
• Indian context (Rajasthan & Kerala)
• [Solar disinfection]
• Current usage of brass/copper vessels
• Work at Northumbria/Panjab Universities
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Indian context (Rajasthan & Kerala)
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Rajasthan (Jodhpur)
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Kerala (Alappuzha)
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[Solar disinfection]
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0
1
2
3
4
0 1 2 3
Time (h)
L o g C F
U / 1 0 0 m l
Field studies - inactivation of faecal indicator bacteriaRajasthan water sample in full sunlight.
Faecal Coliforms
Enterococci
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Solar disinfection – time for 99.9% inactivation
• High light: 180-220 minutes (within 3-4 hours)
• Moderate light: 300-360 minutes (within 5-6 hours)
• Low light: 500-1000 minutes (over 1 day)
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Current usage of copper/brass vessels
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Work at Northumbria & Panjab Universities
(inactivation of faecal bacteria during storage)
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Puja Tandon
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1
100
10000
1000000
100000000
N Mac mFC-R mEndo mLSA
E. coli NCTC 8912 kept for 6 h in a brass pitcher
(initial inoculum show n as dotted line; aerobic counts
unshaded bars; ROS-neutralised counts shaded bars)
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E.faeca lis NCIM B 775,12hr in bras s po t.
0
1
2
3
4
5
6
7
8
N KF SB
Aer
AC+P
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1
100
10000
100 00 00
Mac mFC-R mEndo mLSA
Khanpur river water kept fo r 6 h in a bras s p itcher
(init ial inoculum shown as d o t ted line; aero b ic co unt
unshaded b ars; ROS-neutralised count shaded bars)
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Summary of lab findings:
• Pure culture of all tested strains of
E. coli and Enterococcus faecalis werefully inactivated after 48 hours storagein brass/copper vessels
• Similarly, natural water samples tested
negative for faecal indicator bacteriaafter 48 hours in brass/copper
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initial count after 48 hours
faecal coliforms
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initial count after 48 hours
enterococci
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To t a l C o lif o rms is o la t ed fro m Bras s po t
0
1
2
3
4
Mac mLSA mEndo mFC-R
Aer
An+P
Chandigarh fieldwork: water stored overnight in pitcher
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To tal Co lifo rms is o late d fro m Earthern po t
0
1
2
3
4
Mac mLSA mEndo mFC-R
Aer
An+P
Chandigarh fieldwork: water stored overnight in pitcher
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13050Brasspitcher
16701270Earthernpitcher
17701420Source
water
ROS-neutralisedAerobic
Coliform counts per mL on MacConkey agar
Comparison of source and stored water: Gujrawala village
C l i f ill t t
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Conclusions from village tests:
• For all 3 village locations, a decrease in
coliforms of around 90% was recorded afterovernight storage in brass pitchers
• However, overnight storage was not longenough to achieve total inactivation(48 hours required)
C l i
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Conclusions:
• Water stored in brass (and copper) vesselsinactivates the major faecal indicator bacteria
• Initially (6-24 hours), there is evidence ofsub-lethal injury, but after 48 hours no viable
bacteria can be isolated from water stored inbrass/copper
• These results indicate the direction for
further research into the practical applicationof copper for water disinfection
N xt st ps
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Next steps……
• Extend range of microbes tested
• Investigate effects of water quality
(especially pH)
• Alternatives to copper pitchers?
• Field trials (case-control studies)
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