title: Feasibility of biochar manufactured from organic wastes on the stabilization of heavy metals in a metal smelter contaminated soil.
abstract: The main objectives of the current study were to evaluate the potential effects of biochar derived from sugar cane bagasse (SC-BC) and orange peel (OP-BC) on improving the physicochemical properties of a metal smelter contaminated soil, and determining its potentiality for stabilizing Pb and As in soil. To achieve these goals, biochar was produced in a small-scale biochar producing plant, and an incubation experiment was conducted using a silt loam metal-contaminated soil treated with different application rates of biochar (0-10% w/w). The obtained results showed that, the addition of SC-BC and OP-BC increased significantly the soil aggregate stability, water-holding capacity, cation exchange capacity, organic matter and N-status in soil. SC-BC considerably decreased the solubility of Pb to values lower than the toxic regulatory level of the toxicity characteristics leaching procedure extraction (5 mg L(-1)). The rise in soil pH caused by biochar application, and the increase of soil organic matter transformed the labile Pb into less available fractions i.e. "Fe-Mn oxides" and "organic" bound fractions. On the other hand, As was desorbed from Fe-Mn oxides, which resulted in greater mobility of As in the treated soil. We concluded that SC-BC and OP-BC could be used successfully for remediating soils highly contaminated with Pb. However, considerable attention should be paid when using it in soil contaminated with As.
authors: Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Environmental Research Department, Soils, Water and Environment Research Institute (SWERI), Agricultural Research Center (ARC), Giza, Egypt. Electronic address: zizo_2000_2006@yahoo.com.
authors: Ahmed A
authors: AA
authors: Abdelhafez
authors: Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China. Electronic address: leejianhua@tongji.edu.cn.
authors: Jianhua
authors: J
authors: Li
authors: Faculty of Agriculture, Moshtohor, Benha University, Qhalubia, Egypt.
authors: Mohamed H H
authors: MH
authors: Abbas
mesh_terms: D001151:Arsenic / Q000032:analysis*; D002482:Cellulose / Q000737:chemistry; D002606:Charcoal / Q000737:chemistry*; D002681:China; D032084:Citrus sinensis / Q000737:chemistry; D007220:Industrial Waste / Q000032:analysis*; D007854:Lead / Q000737:chemistry*; D031786:Saccharum / Q000737:chemistry; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000737:chemistry*
chemical_list: D007220:Industrial Waste; D012987:Soil; D012989:Soil Pollutants; C540010:biochar; D002606:Charcoal; D007854:Lead; D002482:Cellulose; C027433:bagasse; D001151:Arsenic
keywords: Arsenic; Biochar; Desorption; Lead; Soil; Stabilization