Heavy Metal Contamination of Soil with Domestic Sewage Sludge

Kirkham, M.B.; Juhasz, A. L.; Magesan, G. N.; Naidu, Ravi

doi:10.1201/9781482280173-11

Waste Management 2004

DOI: 10.1201/9781482280173-11

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Heavy Metal Contamination of Soil with Domestic Sewage Sludge

M.B. Kirkham¹,

A. L. Juhasz²,

G. N. Magesan³

et al.

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2006

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Auxin-Enhanced Root Growth for Phytoremediation of Sewage-Sludge Amended Soil

Liphadzi¹,

Kirkham²,

Paulsen³

2006

Environmental Technology

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A technology to increase root growth would be advantageous for phytoremediation of trace metal polluted soil, because more roots would be available for metal uptake. The objective of this study was to determine if the auxin, indole-3-acetic acid (IAA), would increase root growth in soil with metals from sewage sludge, when the tetrasodium salt of the chelate EDTA (ethylenediamine-tetraacetic acid) was added to solubilize the metals. Sunflower (Helianthus annuus L.) plants grew in large pots containing either soil from a sludge farm or composted sludge. The EDTA salt was added at a rate of 1 g kg(-1) soil 37 days after planting. IAA at the rate of 3 or 6 mg l(-1) was sprayed on the leaves (500 ml) and added to the soil (500 ml) three times: 41, 50, and 74 days after planting. At harvest 98 days after planting, oven-dry weights were measured, and plant organs were analyzed for Cd, Cu, Fe, Mn, Ni, Pb, and Zn. Metal uptake was determined as the product of metal concentration in an organ and weight. IAA increased root growth of plants grown in the soil with sludge when no EDTA was present. With no EDTA, Mn and Ni in leaves of plants grown in the soil were higher at 3 and 6 mg l(-1) IAA compared to 0 mg l(-1) IAA. With and without EDTA, Cd and Pb in leaves of plants grown in the compost were higher with 3 and 6 mg l(-1) IAA compared to 0 mg l(-1) IAA.

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Auxin-Enhanced Root Growth for Phytoremediation of Sewage-Sludge Amended Soil

Liphadzi¹,

Kirkham²,

Paulsen³

2006

Environmental Technology

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show abstract

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Heavy Metal Contamination of Soil with Domestic Sewage Sludge

Cited by 1 publication

References 1 publication

Auxin-Enhanced Root Growth for Phytoremediation of Sewage-Sludge Amended Soil

Auxin-Enhanced Root Growth for Phytoremediation of Sewage-Sludge Amended Soil

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