Pesquisa Agropecuária Tropical (Oct 2010)

LEAD AND ZINC LEACHING IN SOIL TREATED WITH IRON SMELTING RESIDUES LIXIVIAÇÃO DE CHUMBO E ZINCO EM SOLO TRATADO COM RESÍDUOS DE SIDERURGIA

  • Leônidas Paixão Passos,
  • Geila Santos Carvalho,
  • Robervone Severina de M. P. do Nascimento,
  • João José Marques

DOI
https://doi.org/10.5216/pat.v40i4.8089
Journal volume & issue
Vol. 40, no. 4

Abstract

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<p style="margin-bottom: 0cm; font-style: normal; font-weight: normal; line-height: 120%; text-decoration: none;" lang="pt-BR" align="JUSTIFY"><span style="color: #000000;"><span style="font-family: Times New Roman,serif;"><span style="font-size: small;">In order to evaluate the dynamics of Zn and Pb in the soil, a greenhouse experiment was set up in pots filled with soil samples (Typic Hapludox) treated with increasing doses of iron smelting residues. It was set under a completely randomized design, in a 3&times;5 factorial scheme, with three replications, combining three iron smelting residues (mill scale, filter press mud, and phosphate mud), with five doses for each residue (0 t ha<sup>-1</sup>, 1 t ha<sup>-1</sup>, 2 t ha<sup>-1</sup>, 4 t ha<sup>-1</sup>, and 8&nbsp;t&nbsp;ha<sup>-1</sup>). Elephant grass was cultivated during 120 days, followed by common beans, for 75 days. In that period, contents of Zn and Pb were determined in the leachate. No Pb was found in the leachate, but Zn proved to be quite mobile in this soil. In soils treated with mill scale and filter press mud, no risk of groundwater contamination was observed, however, the 8 t ha<sup>-1</sup> phosphate mud rate increased Zn contents in the leachate above the maximum allowed by environmental regulations. This fact limits the use of such residue for agricultural purposes. The other two residues should be evaluated in field-scale tests aiming their agricultural use.</span></span></span></p> <p style="margin-bottom: 0cm; font-style: normal; font-weight: normal; line-height: 120%; text-decoration: none;" lang="en-US" align="JUSTIFY"><span style="color: #000000;"><span style="font-family: Times New Roman,serif;"><span style="font-size: small;">KEY-WORDS: Industrial residue; heavy metal; mill scale; filter press mud; phosphate mud.</span></span></span></p><p style="margin-bottom: 0cm; font-style: normal; font-weight: normal; line-height: 120%; text-decoration: none;" lang="pt-BR" align="JUSTIFY"><span style="color: #000000;"><span style="font-family: Times New Roman,serif;"><span style="font-size: small;">Objetivou-se, com este estudo, avaliar a mobilidade de Pb e Zn no solo. Instalou-se um experimento, em casa-de-vegeta&ccedil;&atilde;o, em vasos preenchidos com amostras de Latossolo Vermelho-Amarelo, submetidas a doses de res&iacute;duos sider&uacute;rgicos, sob delineamento inteiramente casualizado, em esquema fatorial 3&times;5, com tr&ecirc;s repeti&ccedil;&otilde;es, combinando-se tr&ecirc;s res&iacute;duos sider&uacute;rgicos (carepa de aciaria, lama de filtro-prensa e lama de fosfato), com cinco doses de cada res&iacute;duo (0 t ha<sup>-1</sup>, 1 t ha<sup>-1</sup>, 2 t ha<sup>-1</sup>, 4 t ha<sup>-1</sup> e 8 t ha<sup>-1</sup>). Cultivou-se capim-elefante, por 120 dias, e, posteriormente, realizou-se o cultivo de feij&atilde;o, durante 75 dias. Neste per&iacute;odo, avaliaram-se as concentra&ccedil;&otilde;es de Pb e Zn no lixiviado. N&atilde;o houve lixivia&ccedil;&atilde;o de Pb, por&eacute;m, o Zn apresentou bastante mobilidade na coluna de solo. Em solo adubado com carepa de aciaria e lama de filtro-prensa, n&atilde;o foram observados riscos de contamina&ccedil;&atilde;o do len&ccedil;ol fre&aacute;tico por Zn e Pb, entretanto, a dose de 8 t ha<sup>-1</sup> de lama de fosfato elevou os teores de Zn no lixiviado acima do m&aacute;ximo permitido pela legisla&ccedil;&atilde;o. Tal fato limita o uso deste &uacute;ltimo res&iacute;duo em doses altas. Os demais res&iacute;duos (carepa de aciaria e lama de filtro-prensa) devem ser testados em experimentos de campo, visando &agrave; sua poss&iacute;vel utiliza&ccedil;&atilde;o agr&iacute;cola.</span></span></span></p> <p style="margin-bottom: 0cm; font-style: normal; font-weight: normal; line-height: 120%; text-decoration: none;" lang="pt-BR" align="JUSTIFY"><span style="color: #000000;"><span style="font-family: Times New Roman,serif;"><span style="font-size: small;">PALAVRAS-CHAVE: Res&iacute;duo industrial; metal pesado; carepa de aciaria; lama de filtro-prensa; lama de fosfato.</span></span></span></p> <!--[if gte mso 9]><xml> Normal 0 21 false false false MicrosoftInternetExplorer4 </xml><![endif]--><!--[if gte mso 9]><xml> </xml><![endif]--><!--[if !mso]><object classid="clsid:38481807-CA0E-42D2-BF39-B33AF135CC4D" id=ieooui></object> <mce:style><! st1:*{behavior:url(#ieooui) } --> <!--[endif]--> <!--[if gte mso 10]> <mce:style><! /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabela normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} --> <!--[endif]-->

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