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May 18th

biofuels class

QuestionAnswer
What our categories of traits matter in agriculture? 1. productivity 2. harvestability 3. crop protection 4. product profile
How do you measure productivity in fuel? 1. $/gal aka EROI 2. gm/ m2/day 3. tons/ acre/year 4. gallons/acre/year
outdoor ponds are also called ___ and are __ vs photobioreactors raceway ponds 1. less efficient 2. less expensive
For outdoor growth, light is other parameters a limiting factor 1. temperature fluctuations 2. evaporation
what plays a role in the level of evaporation wind speed humidity temperature
what is the importance of mixing temperature stratification light penetration
mixing is __ but results in increased ____ and _____ which results in increased biomass productivity expensive 1. light utilization 2. gas exchange
methods of mixing 1. low speed paddle wheel 2. propeller aspirator pump
___ is the most expensive part of the process and ___ biomass concentration reduces the effective harvesting cost harvesting higher
three types of closed bioreactor systems 1. flat plate photobioreactor 2. tubular photobioreactor e. column photobioreactor
what is 1. relatively cheap 2. low energy but 1. has low biomass productivity 2. difficult crop production raceway pond
what has 1. cheapest bioreactor but 1. high capex expensive temperature control tubular photobioreactor
what has 1. high biomass productivities 2. best light penetration but 1. high cap ex 2. expensive temperature control flat plate photobioreactor
what has 1. compact but 1. high capex expensive temperature control column photobioreactor
methods of harvesting 1. flocculation 2. centrifugal sedimentation 3. biomass filtration
two step harvesting process 1. bulk harvesting: separation of biomass and water 2. thickening: concentrate the biomass
pathogens of algae 1. chytrid fungi 2. rotier
crop protection types 1. naturally resistant strains 2. cropping practices 3. chemical protectants
algae= 3 parts 1. water 2. protein 3. lipids
2 types of conversions from algae biomass 1. thermochemical conversion - gasification - thermochem liqui - pyrolysis - direct combustion 2. biochemical conversion - anarobic digestion - alcohol fermentation - photobioreaction (H2)
Baseline goal energy out >> energy in
ways that chemical engineering can help 1. harvesting process 2. extraction process 3. pond and reactor design 4. scale up
Created by: sunying12
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