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Experience in Closed Anaerobic Digesters Operation for POME Biogas Harnessing Under CDM Project

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. www.greens.com.my. Anaerobic Technology (no air required for microbial survival).

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Experience in Closed Anaerobic Digesters Operation for POME Biogas Harnessing Under CDM Project

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  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. www.greens.com.my

  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 CO2

  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 – MASTM Palm Oil Mill Effluent – Mesophilic Anaerobic SystemTemperature range 320C – 400C

  10. POME-MASTMSystem

  11. System used in 4 Palm Oil MillsTotal digesters : 12 Sizes:1700m3, 2200m3, 3600m3, 5800m3

  12. Results COD Reduction Efficiency

  13. Graph Showing Typical Results On Daily Basis Figure 1: 1700 m3 Anaerobic Digester Monitoring Results

  14. Figure 2: 3600 m3 Anaerobic Digester Monitoring Results

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

  16. Biogas production depends on • Effluent flow rate • Incoming COD value • Effluent temperature

  17. Typical Values Mill production: 40T FFB/HrPOME: 24m3/HrIncoming COD total: 55,000 mg/l COD reduction efficiency in the digester: 92% Methane production: 425m3/hrBiogas at 60% CH4 content: 708m3/Hr Theoretical power generation potential: 1274kW-1558kW

  18. COD reduction values measured in POME-MASTM varies from 90% to 95%

  19. CH4 (Methane) values measured in POME-MASTMvaries from 60% to 75%

  20. * Can vary from 1.8kW to 2.3kW per m3 of biogas based on generator efficiency

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

  22. Flare CDM compliant GREEN-FLARETM Exhaust temperature set 6100C maintained at 610 + 30C Gas retention time about 0.86 seconds

  23. Conclusion • POME-MASTM system gives high COD reduction efficiency > 90% • Takes shock loads • CH4 contents 60% to 75% in Biogas • Runs in sustainable manner either on continuous or batch feed mode • GREEN-FLARETM (CDM compliant closed flare) maintains same set exhaust temperature for different gas flows

  24. Thank You Presenter: Ir. RM.Subbiah (012-2181903) Green & Smart Sdn. Bhd. www.greens.com.my

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