Effect of treated zeolite, iron waste, and liming on phytoavailability of Zn, Cu, and Ni in long-term biosolids-amended soils

Abstract

Two metal-contaminated biosolids-amended soils (moderately and highly contaminated) from the Bromley Sewage Treatment Farm, Christchurch, New Zealand, were used to evaluate the effect of remedial treatments on Ni, Zn, and Cu phytoavailability to sunflower (Helianthus annus L.). Two different chemical treatments (iron waste and treated zeolite), at 2 rates of application (5% and 10% w/w), in combination with 3 rates of a liming material (Ca(OH)2 at 0%, 0.33%, and 0.66% w/w) were evaluated for their metal remediation potential using pot experiments. Under the moderately acidic pH conditions of the original soils (pH 5.4–5.7), neither of the materials had substantial effects on plant metal concentrations, and the application of treated zeolite resulted in a large decrease in plant yield (>60% reduction). However, in the presence of Ca(OH)2, both materials showed some potential for reducing Ni and Zn concentrations in sunflowers compared with Ca(OH)2 alone. The best combinations of zeolite or iron waste with Ca(OH)2 resulted in reductions in shoot Ni concentrations to below the detection limit. For Zn, the best combinations of materials resulted in reductions in sunflower shoot Zn concentrations of 91% for the moderately contaminated soil and 75% for the highly contaminated soil. Combinations of iron waste and Ca(OH)2 in particular resulted in substantial decreases in soluble soil Zn concentrations (>90% reduction) and increases in plant yield (63% increase for highly contaminated soil), attributed to the remediation of Zn toxicity. There was little effect of any treatment on Cu concentration in the sunflower plants.

Interaction of vascular streak dieback disease of cocoa with soil nutrient status in Indonesia

“…However, in this study no significant decrease in copper and zinc concentration in young cocoa plants was observed. Use of zeolite as an amendment is usually practised in soils with very high micronutrient availability where the levels of these nutrients tend to be toxic to plant growth but this was not the case here (Valente et al 1982;Burriesci et al 1984;Nissen et al 2000;Gheshlagi et al 2008;Lin & Lou 2009;Menzies et al 2009;Antoniades et al 2012;Peter et al 2012). The soil used in this experiment was high in copper and zinc, but the levels may not be categorized as being toxic for cocoa plant growth.…”

Superfosfato triplo, lama vermelha e zeólitas para remediação de metais pesados em solo contaminado

“…Gheshlaghi et al (2008) determinaram redução da biodisponibilidade de Zn e Ni para girassol, em solos remediados com zeólitas e calcário.…”

“…O potencial remediador da lama vermelha e zeólitas já é bem fundamentado por pesquisas de base, como estudos de adsorção (RIBEIRO FILHO, 2003;CORREIA, 2007) e pesquisas aplicadas, como experimentos de incubação em vasos (OSTE et al, 2002;LOMBI et al, 2002;LOMBI et al, 2003;GHESHLAGHI et al, 2008 ; Z 10: zeólitas 10 g kg Entretanto, a principal alteração apresentada por este metal pesado consiste no deslocamento de Zn para a fração oxi-hidróxidos, nos três tratamentos partindo, principalmente, das frações carbonatos e matéria orgânica do solo contaminado.…”