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ABSTRACT:The aim of this study was to evaluate the performance of Tifton 85 grass cultivated in soil columns and fertilized with different wastewater doses of swine slaughterhouse. The experiment was conducted in the Environmental Engineering Center and Sanitary of UFLA/MG in PVC columns filled with Dark Red Latosol (Oxisol) and randomly distributed. The treatments applied with nitrogen based load (300 kg ha de N years -1 ) consisted of four doses of SW and AQT0 control at random. Three cuts were performed, at 60, 90 and 120 days after planting. The highest yields were 10.06, 16.82 and 20.39 t ha -1 in AQT0, AAT4 and AAT3 treatments, respectively. With the increase of nutrients by N rates and root development of Tifton 85 grass, we observed higher extractions of N, P and K in the second and third cut, with maximum extraction of 384 and 10.3 kg ha -1 of N and P in the higher dose treatments (AAT4), while the maximum extraction of the potassium was 117.7 kg ha -1 in the AAT3 treatment. There was productivity restriction in the third cut due to the reduction of availability of essential nutrients and losses by leaching.

Resumo: Durante o processo de potabilização da água são gerados resíduos (lodo) que, na maioria das estações de tratamento, não são tratados e são devolvidos diretamente ao manancial, impactando-o negativamente. O presente trabalho apresenta os resultados de parâmetros físico-químico-biológicos obtidos para o lodo gerado na estação de tratamento de água do Serviço Autônomo de Água e Esgoto de Formiga -MG, a fim de quantificar seu potencial poluidor. Os resultados obtidos foram confrontados com os padrões estabelecidos na Resolução n° 430/2011 do Conselho Nacional de Meio Ambiente para lançamento de efluentes em corpos receptores. O lodo da estação de tratamento de água de Formiga -MG, em ambos os períodos analisados, não atendeu à legislação, sendo indevido seu descarte direto em corpos d'água. Entretanto, as concentrações de cádmio, cálcio, chumbo, cobre, cromo, fósforo, magnésio, matéria orgânica, mercúrio, níquel, sódio e zinco no lodo não sofreram alterações dentro do intervalo de tempo analisado nesse estudo. Palavras-chave:Resíduos. Metais pesados. Padrões de lançamento. CHARACTERIZATION OF SLUDGE GENERATED AT A WATER TREATMENT STATIONAbstract: In the water purification process, waste (sludge) is generated and, in most treatment plants, this sludge isn't treated, being returned directly to the river, negatively impacting it. This study aimed at determining physical, chemical and biological parameters of the sludge generated at the water treatment station of the Water and Sewage Autonomous Service of the city of Formiga, Minas Gerais, Brazil, to quantify its polluting potential. Results were compared to standards established by National Environment Council, in Resolution No. 430/2011, for effluents discharge at rivers. The sludge from studied water treatment station, in both periods analyzed, didn't comply with the legislation. However, sludge's concentrations of cadmium, calcium, lead, copper, chromium, phosphorus, magnesium, organic matter, mercury, nickel, sodium and zinc didn't change within time interval analyzed in this study.

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ABSTRACT:The objective of this study was to evaluate the quality of the percolate in soil columns cultivated with Tiffon-grass 85 under different wastewater rates from swine slaughterhouse and dairy. The experiment was conducted at the Department of Engineering at the Federal University of Lavras, in PVC columns with 0.30 m of diameter and 1.2 m deep, filled with Dark Red Latosol cultivated with Tifton-grass 85. The treatments consisted of a (AQT0) control with recommended chemical fertilization for Tifton-grass 85 (300 kg ha -1 year -1 of N), and four doses of SSW and DPW (100, 200, 300 and 400% of the recommendation) in a CRD with 3 replications. The samples of percolated were collected and characterized weekly. The treatments of highest dosage have obtained COD, after 120 days, of 47.7 mg L -1 (AAT3) and 38.6 mg L -1 (AAT4). Although nitrate concentrations were elevated on the earlier months, the greater assimilation of nutrients by the Tifton-grass 85 and the reduction of the mineralization of organic material resulted in lower nitrate concentrations of 10 mg L -1 .