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DOI:
https://doi.org/10.5007/2175-7925.2008v21n1p17Abstract
Performance of the macrophyte Lemna valdiviana in tertiary pig waste treatment and its contribution to the sustainability of swine production. The present study aims to contribute to the sustainability of swine production by evaluating usage of the aquatic macrophyte Lemna valdiviana in the tertiary treatment of pig waste. Five assays (1 to 5) in triplicate were conducted using swine effl uent with different COD(Che mical Oxygen Demand) concentrations: 400, 550, 700, 850 and 1,000 mg.L-1,respectively. The trial lasted for 21 days and the evaluated variables were: (a) pollutant removal effi ciency, (b) biomass production and (c) plant protein content under the different detention times of 7, 14 and 21 days. In general, assays 1 and 2 (CODs of 400 and 550mg.L-1) presented the best removal effi ciencies under a detention time of 21 days. Regarding the purpose of both nutrient removal and production of high protein biomass, assay 3 (COD of 700mg.L-1) showed the bestresults under 14 days’ detention time (36.81% crude protein). It was established that the use of duckweeds in the tertiary swine waste treatment was able to provide a sustainable alternative regarding its advantages such as effl uent polishing, minimization of environmental impact, and production of high protein feed.
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2011-09-22
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