Purification capacities of ornamental plants to biogas slurry
To investigate the purification capacities of ornamental plants to biogas slurry,seven plants were selected to study the growth characteristics and the purification efficiencies to pollutants with the hydroponics experiments.Results showed that the relative growth and the adaptability of Rohdea japonica,Spathiphyllum kochii,Anthurium andraeanum and Alocasia macrorrhiza were significantly higher than others.The COD removal rates for most plants increasd with the hydraulic retention time increasing,and were almost 80％,finally.When the hydraulic retention time was 7 d,the TN removal rates of Anthurium andraeanum,Spathiphyllum kochii and Rohdea japonica reached to almost 80％.The TP removal rates of all plants during the experiments were below 60％.The removal efficiencies of seven plants to different pollutants were significantly higher than that of control (p ＜ 0.05),while significant differences were exsisted among these plants (p ＜ 0.05).The results indicated that Rohdea japonica,Anthurium andraeanum and Spathiphyllum kochii could be selected for purifying the biogas slurry.
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