Functioning, types and selection of biodigesters

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Functioning, types and selection of biodigesters

  1. 1. Functioning, types and selection ofFunctioning, types and selection of BiodigesterBiodigester Prakash C. Ghimire Asia-Africa Biogas Programme, SNV
  2. 2. Working of a BiodigesterWorking of a Biodigester • Output: Biogas + bioslurry • Input: Organic material (animal dung & night soil) • Process: Anaerobic fermentation
  3. 3. Based upon type of gas holderBased upon type of gas holder 1.1. Floating gas HolderFloating gas Holder 2. Fixed gas holder2. Fixed gas holder 3. Tunnel/Tubular3. Tunnel/Tubular Types of Biogas Plants Based upon type of FeedingBased upon type of Feeding 1. Continuous Feeding1. Continuous Feeding 2. Batch Feeding2. Batch Feeding 3. Semi3. Semi--batch /continuous Feedingbatch /continuous Feeding Based upon Method of InstallationBased upon Method of Installation 1. Pre1. Pre--fabricatedfabricated 2. Constructed in site2. Constructed in site
  4. 4. Types of BioTypes of Bio--digestersdigesters Floating Gas Holder Type - India Floating Gas Holder Type - Nepal
  5. 5. Types of BioTypes of Bio--digestersdigesters Plastic Tunnel-type
  6. 6. Types of BioTypes of Bio--digestersdigesters Chinese Fixed Dome Type
  7. 7. Types of BioTypes of Bio--DigestersDigesters Janata Model- India Deen-bandhu Model-India
  8. 8. Types of BioTypes of Bio--DigestersDigesters Vietnam Model
  9. 9. Types of BioTypes of Bio--DigestersDigesters German (Borda) Model (Akut)
  10. 10. Types of BioTypes of Bio--DigestersDigesters Tanzanian (CAMARTECH) Model
  11. 11. Types of BioTypes of Bio--DigestersDigesters VACVINA Model-Vietnam, Cambodia
  12. 12. Types of BioTypes of Bio--DigestersDigesters Plug Flow Model
  13. 13. Types of BioTypes of Bio--DigestersDigesters Bangladesh Model
  14. 14. Cambodia Model
  15. 15. Types of BioTypes of Bio--digestersdigesters GGC Model (Nepal, Laos, Rwanda, Ethiopia, Pakistan)
  16. 16. Fiber glass/HDPE Biogas Plants
  17. 17. LPTP DesignLPTP Design--IndonesiaIndonesia Brick Pipe PVC Filter (wire mash/bamboo) Floor A B Stone Masonry Concrete/Stone masonry Sand Filling C Cover Plate Concrete/brick Brick C Outlet chamber A Inlet B Digester LPTP - FIXED DOME TYPE
  18. 18. Plant for Tofu IndistriesPlant for Tofu Indistries A PlatPenyaring Pas.BatuKali PasirUrug BalokPenyangga PipaPVC PipaPVC B Filter C POTONGANBIOGASTAHU PipaPVC ABakEqualisasi B BakSedimentasi DBakPeluapan CAnaerobicFilter D
  19. 19. Selection of Biogas Plant DesignSelection of Biogas Plant Design A biogas plant should be:A biogas plant should be: StrongStrong Reliable/robustReliable/robust Water tightWater tight GasGas--tighttight Built of local materialsBuilt of local materials Cheap to buildCheap to build Easy to buildEasy to build Cost effective to supervise the constructionCost effective to supervise the construction UserUser--friendly (Easy to operate and maintain)friendly (Easy to operate and maintain) Easy to insulate (in cold areas).Easy to insulate (in cold areas).
  20. 20. Selection of Biogas Plant DesignSelection of Biogas Plant Design Models presently in use at the local levelModels presently in use at the local level Models not in use at the local level but are beingModels not in use at the local level but are being widely used in other countries with similar sociowidely used in other countries with similar socio-- economic and climatic conditionseconomic and climatic conditions Models with proven track records of successfulModels with proven track records of successful operationoperation
  21. 21. Selection of Biogas Plant DesignSelection of Biogas Plant Design Climatic and geoClimatic and geo--physical parameters (constructionphysical parameters (construction environment)environment) Ambient temperatureAmbient temperature GeoGeo--physical conditions of the soilphysical conditions of the soil Condition of ground waterCondition of ground water--tabletable Geological stability of the area (landslides,Geological stability of the area (landslides, earthquake etc.)earthquake etc.)
  22. 22. Selection of Biogas Plant DesignSelection of Biogas Plant Design Technological ParametersTechnological Parameters Structural durability against different load conditionsStructural durability against different load conditions Methods of construction and supervisionMethods of construction and supervision Time and efforts in quality controlTime and efforts in quality control Methods of operation and maintenanceMethods of operation and maintenance Applicability/adoptability of the design in differentApplicability/adoptability of the design in different geographical context for mass disseminationgeographical context for mass dissemination Prospects for sharing of technical information andProspects for sharing of technical information and knowknow--howhow
  23. 23. Selection of Biogas Plant DesignSelection of Biogas Plant Design Affordability of potential farmers to install biodigesterAffordability of potential farmers to install biodigester Availability and accessibility of constructionAvailability and accessibility of construction materialsmaterials Availability of human resources (skilled andAvailability of human resources (skilled and unskilled) at the local levelunskilled) at the local level Cost of installation, operation and maintenanceCost of installation, operation and maintenance Transportation facilitiesTransportation facilities Quality and quantity of available feeding materialsQuality and quantity of available feeding materials Type of feeding materials (cattle dung, pig manure,Type of feeding materials (cattle dung, pig manure, human excreta etc.)human excreta etc.) No. of cattle per household and grazing patternNo. of cattle per household and grazing pattern Availability of water for mixingAvailability of water for mixing
  24. 24. Selection of Biogas Plant DesignSelection of Biogas Plant Design Purpose of the use of the biodigester productsPurpose of the use of the biodigester products Use of gas for cooking, lighting and/or operating a duelUse of gas for cooking, lighting and/or operating a duel-- fuel enginefuel engine Use of slurry as organic fertiliserUse of slurry as organic fertiliser Gas use/cooking patternGas use/cooking pattern Performance of existing models, if any, in the local and/orPerformance of existing models, if any, in the local and/or regional conditionsregional conditions Existing physical status and functioningExisting physical status and functioning User's level of satisfactionUser's level of satisfaction
  25. 25. Selection ofSelection of BiogasBiogas Plant DesignPlant Design Any other criteria???Any other criteria???

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