-Dry matter yield and chemical composition of forage grasses harvested from an area degraded by urban solid waste deposits were evaluated. A split-plot scheme in a randomized block design with four replicates was used, with five grasses in the plots and three harvests in the subplots. The mineral content and extraction and heavy metal concentration were evaluated in the second cut, using a randomized block design with five grasses and four replicates. The grasses were Brachiaria decumbens cv. Basilisk, Brachiaria ruziziensis, Brachiaria brizantha cv. Marandu and cv. Xaraés, and Panicum maximum cv. Tanzânia, cut at 42 days of regrowth. The dry matter yield per cut reached 1,480 kg ha -1 ; the minimum crude protein content was 9.5% and the average neutral detergent fiber content was 62.3%. The dry matter yield of grasses was satisfactory, and may be an alternative for rehabilitating areas degraded by solid waste deposits. The concentration of heavy metals in the plants was below toxicity levels; the chemical composition was appropriate, except for phosphorus. The rehabilitated areas may therefore be used for grazing.
Uma grande quantidade de medicamentos é consumida anualmente, o que vem gerando uma grande preocupação com relação à contaminação ambiental, especificamente a contaminação de efluentes. Dentre os fármacos mais utilizado, destaca-se os antibióticos. O composto Metronidazol (MNZ) tem sido alvo de estudos. Os estudos realizados comprovaram a eficiência das NPs na remoção do MNZ, de acordo com os parâmetros avaliados e estabelecidos -pH, massa de nFZV/SBA-15 e concentração do fármaco. Processo de tratamento redutor alternativo utilizando NPs contendo Fe é muito promissor para a eliminação de fármacos.Palavras Chave: nanopartículas de fe 0 ; remoção, metronidazol; sba-15.A large number of medicines are consumed annually which has generated a great concern about environmental contamination, specifically the contamination on effluents. Among the most widely used drugs, antibiotics are highlighted. The metronidazole compound (MNZ) has been the subject of studies. The studies carried out demonstrated the efficiency of NPs in the removal of the MNZ, according to the evaluated and established parameters -PH, NFZV/SBA-15 mass and concentration of the drug. The process of alternative reductive treatment using Fe-containing NPs is very promising for the elimination of drugs.
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