| 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" |
| 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" |
