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Adv Space Res

Title:		Evaluation of an anaerobic digestion system for processing CELSS crop residues for resource recovery
Author(s):		Strayer RF; Finger BW; Alazraki MP;
Address:		"Dynamac Corporation, Kennedy Space Center, FL 32780, USA"
Journal Title:		Adv Space Res
Year:		1997
Volume:		20
Issue:		10
Page Number:		2009 - 2015
DOI:		10.1016/s0273-1177(97)00934-4
ISSN/ISBN:		0273-1177 (Print) 0273-1177 (Linking)
Abstract:		"Three bioreactors, connected in series, were used to process CELSS potato residues for recovery of resources. The first stage was an anaerobic digestor (8 L working volume; cow rumen contents inoculum; fed-batch; 8 day retention time; feed rate 25 gdw day-1) that converted 33% of feed (dry weight loss) to CO2 and 'volatile fatty acids' (vfa, 83:8:8 mmolar ratio acetic:propionic:butyric). High nitrate-N in the potato residue feed was absent in the anaerobic effluent, with a high portion converted to NH4(+)-N and the remainder unaccounted and probably lost to denitrification and NH4+ volatilization. Liquid anaerobic effluent was fed to an aerobic, yeast biomass production vessel (2 L volume; Candida ingens inoculum; batch [pellicle] growth; 2 day retention time) where the VFAs and some NH4(+)-N were converted into yeast biomass. Yeast yields accounted for up to 8% of potato residue fed into the anaerobic bioreactor. The third bioreactor (0.5 L liquid working volume; commercial nitrifier inoculum; packed-bed biofilm; continuous yeast effluent feed; recirculating; constant volume; 23 day hydraulic retention time) was used to convert successfully the remaining NH4(+)-N into nitrate-N (preferred form of N for CELSS crop production) and to remove the remaining degradable soluble organic carbon. Effluents from the last two stages were used for partial replenishment of minerals for hydroponic potato production"
Keywords:		"Aerobiosis Anaerobiosis Biodegradation, Environmental Biofilms Biomass *Bioreactors Candida Carbon Carbon Dioxide/metabolism *Ecological Systems, Closed Evaluation Studies as Topic Life Support Systems/*instrumentation Minerals Nitrates/metabolism Quatern;"
Notes:		"MedlineStrayer, R F Finger, B W Alazraki, M P eng Comparative Study England 1997/01/01 Adv Space Res. 1997; 20(10):2009-15. doi: 10.1016/s0273-1177(97)00934-4"