Abstract
It is expected that the future construction of the Paraná Medio Hydroelectric Project on the middle Paraná River in Argentina will lead to the accumulation of floating hydrophytes, mainly water hyacinth. Several problems are related to aquatic plants, and steps for efficient control of the vegetation should be taken. If mechanical control is used, the biomass must be processed, preferably in a useful way. Water hyacinth growth in the middle Paraná River has been measured and its bioconversion to methane by anaerobic fermentation determined. It is estimated that gross methane production may be between 1.0 and 4.1 × 10 m 3/yr. The fermentation residue production, with a potential value as soil condition, may represent between 54.9 and 221.4 × 10 3 t nitrogen/year, i.e., between 2 and 8 times the present nitrogen fertilizer demand in Argentina.
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