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Experience in Closed Anaerobic Digesters Operation for POME Biogas Harnessing Under CDM Project By Ir. RM Subbiah and Tuan Haji Alui Ahmad Green & Smart.

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Presentation on theme: "Experience in Closed Anaerobic Digesters Operation for POME Biogas Harnessing Under CDM Project By Ir. RM Subbiah and Tuan Haji Alui Ahmad Green & Smart."— Presentation transcript:

1 Experience in Closed Anaerobic Digesters Operation for POME Biogas Harnessing Under CDM Project By Ir. RM Subbiah and Tuan Haji Alui Ahmad Green & Smart Sdn. Bhd.

2 Anaerobic Technology (no air required for microbial survival)

3 Traditionally used A.D. types in POME treatment Deep open tanks Deep lagoons (Biogas released to atmosphere, GHG)

4 OPEN TANK

5 GHG contribute to global warming POME Biogas contains 45% to 80% methane, which has 21 times higher global warming potential than CO 2

6 New AD types used for POME treatment based on “Clean Development Mechanism” (CDM) principles Closed lagoon with covering Closed tanks with stirring (Biogas harnessed)

7 CLOSED LAGOON

8 Completely Stirred Tank (CST) System Stir the tank content by: Using biogas itself Using stirrers Using pumps

9 POME – MAS TM Palm Oil Mill Effluent – Mesophilic Anaerobic System Temperature range 32 0 C – 40 0 C

10 POME-MAS TM System

11 System used in 4 Palm Oil Mills Total digesters : 12 Sizes: 1700m 3, 2200m 3, 3600m 3, 5800m 3

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13 Results COD Reduction Efficiency COD Reduction Efficiency All DigestersDesignMill 1Mill 2 COD Inlet (mg/L) Range – Mean Range Mean COD Outlet (mg/L) 5000 Range 2585 – 4537 Mean 3721 Range 2832 – 7690 Mean 4421 COD Reduction 90%93.22%90.10% Feed Quantitym 3 /day120288

14 Graph Showing Typical Results On Daily Basis Figure 1: 1700 m 3 Anaerobic Digester Monitoring Results

15 Figure 2: 3600 m 3 Anaerobic Digester Monitoring Results

16 Reactors are running sustainably for more than 12 months Longest running > 24 months

17 Biogas production depends on Effluent flow rate Incoming COD value Effluent temperature

18 Typical Values Mill production: 40T FFB/Hr POME: 24m 3 /Hr Incoming COD total: 55,000 mg/l COD reduction efficiency in the digester: 92% Methane production: 425m 3 /hr Biogas at 60% CH 4 content: 708m 3 /Hr Theoretical power generation potential: 1274kW-1558kW

19 COD reduction values measured in POME-MAS TM varies from 90% to 95%

20 CH 4 (Methane) values measured in POME-MAS TM varies from 60% to 75%

21 BIOGAS PRODUCTION AT DIFFERENT COD REDUCTION EFFICIENCIES & DIFFERENT METHANE CONTENT Mill capacity FFBm 3 /hr40 Effluent Flow ratem 3 /hr24 Inlet CODMg/l COD reduction efficiencysee table Assumption : Running on full load on above capacity 1 kg COD reduction gives 0.35m 3 Methane Biogas Production at different methane concentration Biogas Production at different COD reduction % (m 3 /hr) 75%80%85%90%95% At 55 % At 60 % At 65 % At 70 %

22 ESTIMATED ELECTRICITY PRODUCTION Electricity Production COD reduction efficiency75%80%85%90%95% Biogas Production at 60% methane concentration Potential electrical power at 2kW* hr/m 3 of biogas (kWh) * Can vary from 1.8kW to 2.3kW per m 3 of biogas based on generator efficiency

23 Efficiency Difference - Commercial Value Every 5% difference in gas production means extra 500,000 RM 0.30/kWh = RM 150,000 For 21 years SREP feed in tariff difference in revenue = RM 3.15million

24 Flare CDM compliant GREEN-FLARE TM Exhaust temperature set C maintained at C Gas retention time about 0.86 seconds

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27 Conclusion POME-MAS TM system gives high COD reduction efficiency > 90% Takes shock loads CH 4 contents 60% to 75% in Biogas Runs in sustainable manner either on continuous or batch feed mode GREEN-FLARE TM (CDM compliant closed flare) maintains same set exhaust temperature for different gas flows

28 Thank You Presenter: Ir. RM.Subbiah ( ) Green & Smart Sdn. Bhd.


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