In-situ immobilization of selected heavy metals in soils using agricultural wastes and industrial by-products

• Main Authors: Che Fauziah, lshak, Rosazlin , Abdullah
• Format: Conference or Workshop Item
• Published: 2014
• Subjects: Q Science (General); T Technology (General)
• Online Access: http://commonrepo.um.edu.my/13501/1/in%20situ%20immobilization.pdf; http://commonrepo.um.edu.my/13501/
• Institution: Universiti Malaya

Malaysian soils dominantly fall (about 75%) into the Ultisol and Oxisol Orders in Soil Taxonomy. These soils are generally acidic, pH of 4.0-5.0 and contain essentially of variable charge minerals, namely sesquioxides and kaolinite, thus, have low cation exchange capacity or cations retention capacity. Factors controlling heavy metals reactions and mobility in the soil system are pH, CEC, redox potential, etc. and these parameters will be exploited in the management of heavy metals contaminated soils. Amongst the remediation techniques opted are liming, in-situ chemical stabilization using agricultural wastes converted to biochar's, such as oil palm empty fruit bunch and rice husk biochar's, and industrial by-products such as Red gypsum, coal fly ash and water treatment residue, to be applied as soil amendments.