Presentation for the institute of engineering and technology on anaerobic digestion using poultry waste. Published paper. Sustainable development of Mauritius.

3.  Operation process of Lazaret broiler farm.
 Lazaret broiler farm consumes around 2.5 M equivalent LPG yearly which is used for
heating up of sheds.
 Provide a win-win solution by producing bio gas from the litter generated by the broiler
farm.
 Company’s investment in the set-up of a anaerobic digestion to meet its energy
needs.
 Anaerobic Digestion (AD) Process.

4. Some of the key objectives of the study include;
1. Characterisation of broiler litter
3. Design and Construction of modern digester
5. Enhance purity of bio gas for methane.
7. Satisfy heating needs using bio gas
9. Evaluate electricity potential
11. Evaluate potential of reducing green house gas emissions
13. Financial Analysis

6. DESCRIPTION OF PROBLEM

7. • Amount of money spent on the purchase of liquefied
petroleum gas
Rs 2.5M on LPG, hence the need to review the energy budget.
• Waste Disposal
120 tons of broiler litter mixed up with wood shavings disposed each
month.

8. ANALYSIS OF ACTUAL SYSTEM

9.  Analysis of past LPG consumption pattern
 Analysis on the amount of heating required to raise temperature to
32oC.
 Quantify the level bio gas production needed in view of meeting the
heating requirements.
 Proper Waste disposal

10. RESEARCH METHODOLOGY

11. O (1) Characterisation of the broiler litter into its physico-
chemical properties.
• Moisture tests,
•pH test,
• The level of Chemical Oxygen Demand (COD),
•The amount of volatile solids (VS) present,
•Suspended solids and
•Bulk Density
O (2) Feed Preparation
• F:M ratio 4:1

12. O (3) Evaluating the heating needs of the farm;
• Shed Dimensions (90.0 m x 9.0 m x 3.5 m)
•Initial Heating
•Heat loss by conduction through structures
Q = amount of heat, (kJ)
cp = specific heat ,(kJ/kg.K)
m = mass, (kg)
dT = temperature difference, (K)
Qstructures = Heat transfer through walls, (W)
Ustructure = heat transfer coefficient, (W/m2.K)
A = Area of exposure, (m2)
dT = temperature difference, (K)

13. O (4) Clean Development Mechanism
• Amount of CO2 emissions avoided with the AD process.
O (5) Power production capability
• Prospect of using the excess amount of methane produced
for producing electricity.
O (6) Bio gas burning heat capacity
• Flame purity for an enhanced heating capability.

14. DESIGN OF DIGESTER

15. (1) 2 Lab scale digesters
• Check for viability of methane production,
•Assess and control the evolution of pH, COD, VS.

16. (2) 3x250 litres Prototype digester
• Same ratio used for feed preparation,
• Pressurised, controllable storage tank using water counter-weight,
• Bio gas purification using a scrubbing tower and a condensation
column.

17. (2.1) 2D schematic of digester

18. (2.2) 3D schematic of digester

19. (2.3) 3D video of digester

20. RESULTS

21. The study confirmed that methane production using broiler
waste is possible. Key results include;
(1) The corresponding amount of methane produced was linked with
the feed the broilers were entailed to.
(2) The results for the physico-chemical properties of the broiler litter
and innoculum are shown below.

22. (3) The ratio used for feed preparation for lab scale digesters and prototype
digesters is shown below;
Volume of Innoculum = 15,000 ml
Volume of Substrate = 65,000 ml
Volume of water = 120,000 ml
Total Volume = 200,000 ml

23. (4) The cumulative volume of methane produced for both set-ups are shown of
which the pH for Run2 was modified to suit the alkaline range.

24. (5) The cumulative volume for the prototype digester.

25. (6) The pH evolution of the lab scale digesters.

26. (7) The COD evolution for both lab scale digesters.

27. (8) The VS evolution for second lab scale digester.

28. (10) Flame analysis.

29. FINANCIAL ANALYSIS

32. CONCLUSION

33. • The amount of bio gas that can be produced per day is
estimated to be around 151.660 m3 which is more than sufficient
to heat the sheds,
•Surplus bio gas can be used to produce electricity,
•Implementation can lead to further growth using other types of
waste,
•Third party gaining acknowledgement for investing in green
initiative.

34. FURTHER WORKS

35. (1)The use of waste heat recovery to trigger methane production,
(2)The use of SCADA to maintain a level of safety in operations.

36. Thanking you
for your attention