Study of Heavy Metals Immobilization of Contaminated Soil by the impetus of Biochar, Red mud & Fly ash

Abstract

Long-term wastewater irrigation or solid waste disposal has resulted in heavy metal contamination in both soil and groundwater, due to the industrial activity nearby Buddha Nullah Area. The remediation of heavy metals merits consideration; however, it is impeded by the expense of these processes. The primary target of this review was to exhibit the theory of concurrent remediation of both heavy metals defiled soil and groundwater by coordinating the compound immobilization strategies. In this study, byproducts such as red mud, biochar and fly ash were used as binders, for the immobilization of heavy metals in combination with sodium silicate solution to produce a geopolymer-based material that can be utilized as building materials. The utilization of biochar for the remediation of debased soils might give another solution to the problem for the soil contamination issue. This study concentrated on the leachability of heavy metals in the unrefined components and the geopolymer as this would be critical in surveying the natural effect of the item. The leachability of heavy metals such as Cu, Zn, Cd, Pb, Fe, and Cr was evaluated based on Indian standards with pH values at 7. The results showed that raw materials (biochar, red mud and fly ash) have higher leachability than geopolymer specimens; also the values of leaching tests for heavy metals in the geopolymer-based materials. Keywords: Immobilization, Heavy Metals, Biochar, Red Mud, Fly Ash.