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AQUATIC MOSS MATS AND THEIR ASSOCIATED BACTERIA: AN ALTERNATIVE TOOL FOR AQUACULTURE AND AQUAPONIC EFFLUENTS TREATING?
Abstract
Wastewater filtration is a physical or mechanical process used to remove impurities from wastewater. It initially involves the removal of suspended solids, bacteria and debris, leading to water clarification and producing safer water for discharge or reuse. Biofiltration adds the microbial metabolism of pollutants to the simple physical removal of solids. Common biofilter materials include inert media such as plastic, ceramic or zeolite, selected for their high surface-to-mass ratio, as biofilm-based processes occur mainly on surfaces. Biodegradable substrates may increase system sustainability but must not release pollutants through degradation. In this context, we evaluated aquatic moss as an alternative substrate for biofiltration of aquaculture or aquaponic effluents. The species Taxiphyllum barbieri, previously identified as promising, was assessed here for its associated microflora before use. Total culturable bacteria at 22 -C and 37 -C were quantified on Plate Count Agar. Vibrio counts were performed on TCBS agar enriched with 2% NaCl. Culturable bacteria reached 5.97 - 106 CFU/mL at 37 -C and 10 - 106 CFU/mL at 22 -C, while no vibrios were detected on TCBS. When moss fragments were placed directly on PCA plates and incubated for 48 h, a visible bacterial coating developed around the moss, whereas no growth appeared on TCBS. Further molecular analyses are needed to characterize the moss-associated microbiota, which may play a key role in bioremediation and offer promising biotechnological applications.
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