1 / 8

Bag Biodigester: Conceptual Design Sizing

Bag Biodigester: Conceptual Design Sizing. Engineers Without Borders University of Minnesota Leo A. Kucek 19 Jan 2009. Bag Biodigester: Sizing. L. D. Bag Biodigester: Sizing. L. D. A: 1 m 3 total D: 0.8 m; L: 2.0 m B: 10 m 3 total D: 1.25 m; L: 8.0 m C: 100 m 3 total

clyde
Download Presentation

Bag Biodigester: Conceptual Design Sizing

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Bag Biodigester:Conceptual Design Sizing Engineers Without Borders University of Minnesota Leo A. Kucek 19 Jan 2009

  2. Bag Biodigester:Sizing L D

  3. Bag Biodigester:Sizing L D • A: 1 m3 total • D: 0.8 m; L: 2.0 m • B: 10 m3 total • D: 1.25 m; L: 8.0 m • C: 100 m3 total • D1: 2.0 m; L: 32.0 m 1: If D > 2.0 m is available, then use larger diameter

  4. Bag Biodigester:Slurry Fraction L D A: 0.75 m3 slurry B: 7.5 m3 slurry C: 75 m3 slurry Assuming a 75% filled reactor volume

  5. Bag Biodigester:Human Manure • Assumptions • Human produces 1.5 ft3 biogas/ dayi • Human dung produces 0.025 m3 biogas/kgii • 0.45 kg/lb; 0.3048 m/ft • 1.5 ft3 gas/day*(0.3048 m/ft)3*0.025kg/m3 gas = 1.70 kg/ day  ~1.5 kg/day ~3 lb/(person*day)??? i: Water Environmental Federation, 2004 ii: FAO

  6. Bag Biodigester:Reactor Flow Rates V/ν = Θ V = 75 x 10n m3 slurry Θ = 20 days v = 3.76 x 10n m3 slurry/day If ρ = 5% v manure / v water ρ = 5 kg (Dry) / 100 L m = 3.76 x 10n m3 slurry/day *1000 L /m3 *5 kg (Dry)/ 100 L m = 188 x 10n kg (Dry)/day If people provide 1.5 kg (Dry)/day Requires 125 x 10n people If 0.025 m3 biogas/kg Produces 4.7 x 10n m3 biogas/day n = 0,-1,-2 (C,B,A)

  7. Bag Biodigester:The Next Step • Are assumptions reasonable? • Human Manure Output • Slurry Concentration • Length of Biodigesters • Operation (Flows, Valves, Scheduling…) • Biogas Produced • Is a continuous biodigester favorable? • Transport? • Pathogens?

  8. References • Water Environment Federation, “High Performance Anaerobic Digestion”, White Paper, January 2004, http://www.wef.org/NR/rdonlyres/4D51F55C-2CDD-42A0-AB9C-D77C4139F51C/0/AnaerobicDigestion.pdf • FAO, “A system approach to biogas technology”, Posted June 1997, http://www.fao.org/sd/EGdirect/EGre0022.htm

More Related