Articles
MICROBIAL COMMUNITIES IN SLOW FILTERS
Article number
548_73
Pages
591 – 602
Language
English
Abstract
Functional microbial communities inhabiting the filter beds of slow filters, connected to closed cultivation systems with Dracena marginata cv.
Tricolor, were compared with respect to flow rate (100 resp. 200 L m-2 h-1) and position in the filter (0, 10, 20 and 40 cm depth of the filter bed) using Biolog GN-panel.
Utilization of sole carbon sources by the collected microflora was analyzed with or without recultivation of the microflora in full-strength TSB prior to inoculation.
Cluster analysis of the microbial communities showed for the recultured samples a main effect caused by the flow rate, whereas the position of the layer within the filter was of subordinate importance.
For the non-recultured plots, a similar though less distinct result was found.
No difference in average well color development (AWCD) was obtained within the filters for the treatments apart from the AWCD of the recultured filter skin microflora generated from filters with a flow rate of 100 L m-2 h-1, increasing significantly more rapidly.
Dependent on recultivation treatment, flow rate and position in the filter, quantitative and qualitative differences were found for utilization of single carbon sources.
Analyses of physical and chemical parameters of the nutrient solution at different depths of the filter bed were performed on the basis of temperature, pH and total organic carbon (TOC). Significant differences between filters with different flow rates were found for pH and TOC.
Tricolor, were compared with respect to flow rate (100 resp. 200 L m-2 h-1) and position in the filter (0, 10, 20 and 40 cm depth of the filter bed) using Biolog GN-panel.
Utilization of sole carbon sources by the collected microflora was analyzed with or without recultivation of the microflora in full-strength TSB prior to inoculation.
Cluster analysis of the microbial communities showed for the recultured samples a main effect caused by the flow rate, whereas the position of the layer within the filter was of subordinate importance.
For the non-recultured plots, a similar though less distinct result was found.
No difference in average well color development (AWCD) was obtained within the filters for the treatments apart from the AWCD of the recultured filter skin microflora generated from filters with a flow rate of 100 L m-2 h-1, increasing significantly more rapidly.
Dependent on recultivation treatment, flow rate and position in the filter, quantitative and qualitative differences were found for utilization of single carbon sources.
Analyses of physical and chemical parameters of the nutrient solution at different depths of the filter bed were performed on the basis of temperature, pH and total organic carbon (TOC). Significant differences between filters with different flow rates were found for pH and TOC.
Authors
B.W. Alsanius, L. Nilsson, Jensén, W. Wohanka
Keywords
filter layer, flow rate, functional diversity, slow filter
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