|Title||Biochar Derived from a Bioenergy Production Industry for Immobilization and Phytotoxicity Reduction of Cr in Tannery Waste Polluted Soils|
|Publication Type||Conference Paper|
|Year of Publication||2014|
|Authors||Herath, Indika, and Vithanage Meththika|
|Conference Name||2nd CLEAR|
Soil contaminated from untreated tannery industrial effluents contains Cr in large extent. When crops plants are cultivated on or adjacent to tannery waste polluted soil (TWS), they can experience reduced growth due to phytotoxicity. This study was aimed to investigate the potential of biochar (BC), a waste byproduct of a bioenegy industry in Sri Lanka, as a soil amendment to immobilize and reduce phytotoxicity of Cr in TWS. A pot experiment was conducted by adding three BC applications 1, 2.5 and 5 % (w/w) to investigate the uptake and bioaccumulation of Cr in tomato (Lycopersicon esculentum L.). Bioavailability of Cr was assessed by 0.01 mol L-1 CaCl2 extraction. Sequential extractions were utilized to evaluate metal ion fractionation in soil. The total Cr concentration in TWS was 10151 mg kg-1. The biomass of tomato plants grown in the 5 % BC amendment soil doubled compared to the biomass in BC unamended soil. Bioaccumulation of Cr in plants grown in 5 % BC amended TWS showed a decrease by 97 % compared to that of the BC unamended soil. The CaCl2-extractability of Cr indicated that the bioavailability of Cr in the 5 % BC amendment has decreased by 68 % compared to the control. Sequentially extracted Cr in the exchangeable fraction of the 5 % BC amendment decreased by 99 % compared to the residual fraction. Results suggested that the addition of BC into TWS reduces the bioavailability and phytotoxicity of Cr in crops plants.