ANDRADE, C. A. de

CAMARGO, O. A. de

PIRES, A. M. M.

RIBEIRINHO, V. S.

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ICOBTE 2013 Abstract 0220-000185Long- Term Disposal of Sewage Sludge in an Oxisol andMetaIs Avaíla bilitv"Victor Sanches RibeirinhoI, Cristiano Alberto de Andrade ', AdrianaMarlene Moreno Pires2, Otávio Antonio de Camargo'Instituto Agronômico de Campinas, Campinas,victor.ribeirillho@gmail.com.br; 2 Empresa Brasileira deJaguariúna, São Paulo, Brazil.Sôo Paulo, Brazil,Pesquisa Agropecuária,ABSTRACT: Search for sustainable destination of sewage sludge is being sought by the scientificcommunity over time. One oí' the most sustainable and lowest cost manageruent is its use inagriculture. However, several factors musr be evaluated to avoid the occurrence of negativeenvironmental impacts. One such factor is the possibility of metals accumulation and their dynamicsin the soil over succéssive .~vasteapplications.We aimed to evaluate Cu, Zn, Mn and Fe availability in an Oxisol which received successiveapplications of industrial sewage sludge, which have stopped eight years ago. The experimentconsisted iu the application of five sewage sludge doses.calculated based 011 N reconunendation formaize culrivation: control treatment (01'), N recommended dose for maize 01'), two- (21'), four-(41'), and eight times the recommendation (81'). Available metals were extracted by DTPA (pH 7.3)and were determined by inductively coupled plasma optical emission spectrometry (ICP-OES) i11 soilsamples taken froin different layers (0-20, 20-40 and 40-60 em). Metais availability in the superficiallayer increased linearly with sludge dose raise.Concentration (mg dm") ranges for lhe metals were: Fe=39 to 149; Mn= 1.6 to 3.6; Cu= 0.8 to 18.6:Zn= 3.6 to 52,6. lu lhe 20-40 em layer, Fe availability increased following a quadratic mo dei, whilethe orher metais had a linear increase. In this case, conce~ltration (mg dm") ranges 10r the metalswere: Fe -x: 413 to 125: tv1n= 1.7 to 2.3: Cu= 0.9 to 10.8: Zn '" 2.8 to 33.1. Mn availability did 110tincrease in the 40-60Clll layer and its concentrarion average was 1.25 mg dm". The other metals had alinear increase. and their concentrarion ranges (mg dm') were: Fe= 30 to 105.7: Cu= 0.6 to 2.53; Zn=2.8 to 14.4.The increasing dose 01' sewage sludge raised nietals availability in the layers up to 40 em. Zinc wasthe elemeut uiat had a niost significaut iucrease iu alI Iayers, These results show that rnetalsavailability could be an environrnental problem afrer discoutiuuing the applications of industrialsludge; therefore it should be better studied and iuonitored./

Long-term disposal of sewage sludge in an oxisol and metals availability.

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