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|Type:||Artigo de periódico|
|Title:||Accumulation of metals in the soil of an overland flow wastewater treatment system|
de Figueiredo, RF
|Abstract:||Accumulation of Co, Cu, Cr, Mo, Ni, Pb and Zn was evaluated in a soil profile of an oyerland flow system used for the post-treatment of urban wastewater. A pilot version of the overland flow system received urban wastewater from five up-flow anaerobic filters filled with bamboo (Bambusa tuldoides) rings. The anaerobic effluent was applied,as feed over 18 months at rates varying from 7 to 28 L min(-1), to,a vegetated slope length, covered with Tifton 85 (Cynodon) sp. grass. Soil and plant samples,were collected in triplicate from the top to the bottom of the slope. In addition, the soils were;sampled at the depths 0-20 and 20-40 cm. The metal concentrations found in the overall system were compared to those obtained in a control area located at the beginning of the slope onto which nothing was applied. A month of monitoring the urban wastewater of Limeira City (Sao Paulo State, Brazil) showed a drastic change in metals concentration. due to the irregular discharge of industrial waste. This irregular discharged introduces Cr, Cu, Ni, Pb and Zn into the system used to treat domestic wastewater. The mass balance indicates the accumulation of metals in the soil and the translocation to, the plants; also that they could be evapotranspirated, percolated and discharged.|
|Editor:||Royal Soc Chemistry|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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