Abstract：
:A fixed-film (biofilm) reactor was designed and its performance was determined at various retention times. The goal was to find the optimal retention time for recycling plant nutrients in an advanced life support system, to minimize the size, mass, and volume (hold-up) of a production model. The prototype reactor was tested with aqueous leachate from wheat crop residue at 24, 12, 6, and 3 h hydraulic retention times (HRTs). Biochemical oxygen demand (BOD), nitrates and other plant nutrients, carbohydrates, total phenolics, and microbial counts were monitored to characterize reactor performance. BOD removal decreased significantly from 92% at the 24 h HRT to 73% at 3 h. Removal of phenolics was 62% at the 24 h retention time, but 37% at 3 h. Dissolved oxygen concentrations, nitric acid consumption, and calcium and magnesium removals were also affected by HRT. Carbohydrate removals, carbon dioxide (CO2) productions, denitrification, potassium concentrations, and microbial counts were not affected by different retention times. A 6 h HRT will be used in future studies to determine the suitability of the bioreactor effluent for hydroponic plant production.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Krumins V,Hummerick M,Levine L,Strayer R,Adams JL,Bauer Jdoi
10.1016/s0960-8524(02)00129-3subject
Has Abstractpub_date
2002-12-01 00:00:00pages
243-8issue
3eissn
0960-8524issn
1873-2976pii
S0960-8524(02)00129-3journal_volume
85pub_type
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