DUGi

Lemna minor per al tractament de la fracció líquida del purí porcí : estudi preliminar sobre el creixement de biomassa i la composició de nutrient

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Despite the significant improvement in managing livestock manure that is poured into crop fields as manure and fertilizers, it is yet a source of ecosystem contamination, especially in areas with a high number of livestock farms, such as Osona. The purpose of this study is to investigate and design a possible nature-based solution (NBS) for the treatment of swine manure. Specifically, the aquatic plant Lemna minor was used through a phytoremediation process, since recent studies demonstrate the potential of this plant to absorb and accumulate pollutants such as nitrogen, phosphorus and ammonium. Nevertheless, this work consists of a preliminary study focused on evaluating the growth of Lemna minor in different increasing concentrations of swine manure, with the main objective of establish the optimal growth range of this plant. To do it, L. Minor has been grown on dechlorinated water, adding three treatments of different slurry concentrations (33, 66 and 100%) continuously for 42 days through multichannel peristaltic pump. During system monitoring, on the one hand, the physicochemical parameters (temperature, pH, electrical conductivity and dissolved oxygen) of the liquid medium have been evaluated and the concentration of total nitrogen (TN), total phosphorus (TP) and total organic carbon (TOC) has been measured. On the other hand, the growth of L. Minor has been quantified and the plant has been characterized through morphology observation and photosynthetic activity. The results obtained conclude that there is more growth of Lemna when a higher concentration of swine slurry enters. Furthermore, high positive correlations have been obtained between growth and TN and between growth and TP. This indicates that a greater availability of nitrogen and phosphorus, achieved by a greater input of manure, favours plant growth. Possible future research could be focus on the study of nutrient absorption capacity of Lemna, to correlate this absorption with the elimination of contaminants from the media

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