Demonstration of a Pilot Scale Leach-bed Multistage Digester for Treating Dry-lot Wastes
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Transcript of Demonstration of a Pilot Scale Leach-bed Multistage Digester for Treating Dry-lot Wastes
Demonstration of a Pilot Scale Leach-bed Multistage Digester for Treating Drylot Wastes April 4, 2013
Lucas Loetscher
Sybil Sharvelle
Department of Civil and Environmental Engineering
Colorado State University
The Feedstock- Mount Manure
Ag/Waste Generation in Colorado
Colorado Manure Wastes % TSBCMP L CH4/kg
Waste
Dry scrape dairy manure 53.1% 23.2
Freshly horse manure 29.9% 35.2
Dairy/horse manure 31.3% 15.6
Wet scrape dairy manure 18.7% 14.0
Dry scrape dairy manure 88.7% 15.9
Dry scrape dairy manure w/ straw 78.8% 49.5
Diluted dry scrape dairy manure 30.9% 13.7
Highly Variable - Yet Promising BCMP
Manure Waste Characteristics
Colorado Manure Wastes % TSBCMP L CH4/kg
Waste
Dry scrape dairy manure 53.1% 23.2
Freshly horse manure 29.9% 35.2
Dairy/horse manure 31.3% 15.6
Wet scrape dairy manure 18.7% 14.0
Dry scrape dairy manure 88.7% 15.9
Dry scrape dairy manure w/ straw 78.8% 49.5
Diluted dry scrape dairy manure 30.9% 13.7
As excreted most of these manures are below 12% TS
Manure Waste Characteristics
Digester Types
Colorado Manure Wastes % TSBCMP L CH4/kg
Waste
Dry scrape dairy manure 53.1% 23.2
Freshly horse manure 29.9% 35.2
Dairy/horse manure 31.3% 15.6
Wet scrape dairy manure 18.7% 14.0
Dry scrape dairy manure 88.7% 15.9
Dry scrape dairy manure w/ straw 78.8% 49.5
Diluted dry scrape dairy manure 30.9% 13.7
As excreted most of these manures are below 12% TS
Manure Waste Characteristics
Compositing Tank
Leachate Bay
Leachate Bay
Leachate Bay
Leachate Bay
Fixed Film Reactor
Leachate Flow Path
Biogas Flow
Hydrolysis Reactors
Acetogenic Reactor
Hydrolysis Reactors
Methanogenic Reactor
The Proposed Solution
Leachate Bay 1
Leachate Bay 2
Leachate Bay 3
Leachate Bay 4
Leac
hate
Sto
rage
Was
tew
ater
Sou
rce
Fixe
d Fi
lm D
iges
ters
Simplified System Flow
Potential System Advantages
Reduced water requirements Substrate flexibility Potential for reduced capital costs Superior process control Process upset is easy to correct
Biogas Production for Various Wastes
Pilot Scale System
Mobile demonstration and research unit System Validation on ~1/100 scale Provides data on how to scale process Able to be self powered and portable
Gas System & Generator
Power
Electrical Panels (2 of 7)
Status of Project
Have filled a single LBR to begin FFR
inoculation
Start operation after 1 month inoculation
phase
Power will be shifted to main panel within the
month
Controls and calibrations to be completed by
June ‘13
Data for scaling the process to be collected by
August ‘13
Tentative Plans for Full Scale System
Full Scale Representation
Vision for Future Developments
Acknowledgments
Colorado Agriculture Experiment StationColorado NRCSColorado Bioscience Discovery GrantColorado Governors Energy OfficeJesse BergdoltBryan GrotzJames Hansen