Heavy metals in a degraded soil treated with sludge from water treatment plant

Scientia Agricola

Sandra Tereza Teixeira¹  Wanderley José De Melo¹  Érica Tomé Silva¹ 

[1] ,UNESP FCAV Depto. de TecnologiaJaboticabal SP ,Brasil

关键词: soil reclaim;    tin mining;    Mehlich 1;    environmental pollution;    recuperação de solo;    mineração de estanho;    Mehlich 1;    poluição;   

DOI  :  10.1590/S0103-90162005000500016

来源: SciELO

【 摘 要 】

The application of water treatment sludge (WTS) to degraded soil is an alternative for both residue disposal and degraded soil reclaim. This study evaluated effects of the application of water treatment sludge to a Typic Hapludox soil degraded by tin mining in the National Forest of Jamari, State of Rondonia, Brazil, on the content of heavy metals. A completely randomized experimental design with five treatments was used: control (n = 4); chemical control, which received only liming (n = 4); and rates D100, D150 and D200, which corresponded to 100, 150 and 200 mg of N-sludge kg-1 soil (n = 20), respectively. Thirty days after liming, period in which soil moisture was kept at 70% of the retention capacity, soil samples were taken and analyzed for total and extractable Fe, Cu, Mn, Zn, Cd, Pb, Ni, and Cr. The application of WTS increased heavy-metal contents in the degraded soil. Although heavy metals were below their respective critical limits, sludge application onto degraded areas may cause hazardous environmental impact and thus must be monitored.

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