Delivered by Ms. Ruth Stringer, Science and Policy Coordinator, Health Care Without Harm (HCWH) at the Global Forum 2020 Innovators from the Field session.
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Biodigestion for Pathological and Biodegradable Waste Management in Tanzania
1. GLOBAL FORUM2020
3 R D S A V I N G L I V E S S U S T A I N A B L Y:
SUSTAINABLE PRODUCTION IN THE HEALTH
SECTOR GLOBAL FORUM|2020 RIYADH
Ruth Stringer,
Science and Policy Coordinator, Health
Care Without Harm (HCWH)
Honest Anicetus,
Deogratius Mkembela,
Christoper Kellner
Biodigestion for Pathological and
Biodegradable Waste Management
in Tanzania
3. Pathological & organic waste
disposal
Placentas are hard to burn
Placenta pits smell and fill
up
Food waste attracts
disease vectors, creates a
nuisance
Worst case- waste on
streets
Rotting organic waste
releases greenhouse gases
4. Nepal
Biodigesters at major hospitals
including KMC and TUTH
2-chamber design to maximise
retention time
Gas value of over 2 US cents
per kg of waste treated
Digestate goes to sewer
without further handling
Potential lifetime 20+ years
5. Mwanayamala Hospital,
Dar es Salaam, Tanzania
250 bed hospital
60 deliveries per
day
Placentas input
directly from
maternity unit
Food input via
hatch outdoors
Construction
~$10,000
7. Special burners for biogas
Bio-gas is used for water
heating
Cooking is another efficient
use
Value of gas ~USD 2.20/day
Also reduces waste disposal
costs
8. Will it work for you?
• Minimum 10-12kg of waste/day
• Works for pathological/food/garden
waste
• Space that will not be built on (or cars
parked)
• Ideally close to waste sources
• Source of water to keep digester contents
flowing
• Min 1litre water/kg waste. Too much
reduces retention time
• Connection to sewer or septic tank for
digestate
• Location for use of gas
• As close as possible to digester
• Acceptance by users
• Capable designers/construction
companies
• Capacity for basic maintenance (eg piping,
burners)
9. Sinza Hospital, Dar es
Salaam, Tanzania
Constructed late
2019
Two digesters,
14m3 and 19m3
Treats ~15kg
placenta and ~25kg
food waste each
day
Construction cost
approx. $15,000