Abstract
Heavy metal pollution of the soil environment has become a major source of concern and continues to pose serious health problems to both humans and ecological systems worldwide. Phytoremediation is a biological treatment whereby plants are used to remove pollutant from the environment. An experiment was conducted to evaluate the potential of Melastoma malabathricum as a phytoremediator to absorb heavy metals from soil contaminated with sewage sludge. Melastoma malabathricum seedlings were planted on six different growth media: T0 - Control (100 % soil), T1 (80 % soil + 20 % sewage sludge), T2 (60 % soil + 40 % sewage sludge), T3 (40 % soil + 60 % sewage sludge), T4 (20 % soil + 80 % sewage sludge) and T5 (100 % sludge). There were differences found in both growth parameters and plant biomass. The highest growth performance such as plant height and number of leaves was found in T3. Iron was highly accumulated in the roots, Cu in the stems in T3, while Pb was accumulated in leaves in T5. The results showed the lowest Translocation Factor (TF) and highest Bioconcentration Factor (BCF) values in relation to the following elements: Cu, Fe, Mn, Pb and Zn. Melastoma malabathricum roots are able to uptake and translocate the elements into the plant's shoots. Therefore, it can be considered a good accumulator plant due to its capability of concentrating contaminants in aerial tissue. Melastoma malabathricum were thus found to be suitable for absorbing heavy metals in contaminated soils, and this species can also be considered an effective phtyoremediator of contaminated soil and mitigator of soil pollution.
Highlights
The ever expanding urbanization and population boom has caused a huge increase in the volume of domestic and industrial waste such as sewage sludge which poses a major threat to the environment and human beings
An experiment was conducted to evaluate the potential of Melastoma malabathricum as a phytoremediator to absorb heavy metals from soil contaminated with sewage sludge
Melastoma malabathricum were found to be suitable for absorbing heavy metals in contaminated soils, and this species can be considered an effective phtyoremediator of contaminated soil and mitigator of soil pollution
Summary
The ever expanding urbanization and population boom has caused a huge increase in the volume of domestic and industrial waste such as sewage sludge which poses a major threat to the environment and human beings. The most common way to reduce sewage sludge is to dispose of it in the land or in the sea (Odegaard et al, 2002) It is suitable as fertilizer material and suitable for being used as an amendment to the soil because it contains high amounts of nutrient (Korentajer, 1991; Abdu et al, 2011). Sewage sludge such as anthropogenic sources of heavy metals contains numerous contaminants which can be hazardous to living organisms (Murtaza et al, 2010)
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