Effective use of iron-aluminum rich laterite based soil mixture for treatment of landfill leachate

Feasibility of biodegradation of Azamethiphos; odour and fly controlling chemical used in open solid waste dumpsite at Karadiyana, Colombo, Sri Lanka

“…Pesticides that sorb weakly to soil particles are more likely to move through the soil profile via infiltration to water (Nayanthika et al, 2018). In this study the sorption coefficient (K OC ) values were relatively high in each soil sample (Table 3) which depicts that a high amount of pesticides is likely to be in sorbed status combining with the organic matter.…”

Experimental Study on Viscoplastic Property of Unsaturated Reticulate Red Clay Used as an Engineered Barrier

“…Engineered barriers in landfills are often placed in an unsaturated condition to avoid direct contact with the atmosphere and changes in the groundwater level [3,4]. Because of their low permeability, self-healing through swelling, low cost, and high adsorption capacity, clays such as red clays (or laterite) and bentonite are widely used in seepage control systems in contaminated sites [5][6][7]. The viscoplastic property of compacted clay is a relevant factor that must be considered in the design and operation of engineered barriers and liner systems.…”

Geochemical processes during the stabilization of potentially toxic elements (PTEs) in contaminated soil by using mineral amendments

“…The retention of PTEs (Pb, Cd, Cu) on Fe-coated quartz sand has been confirmed by Benjamin et al (1996) and Covelo et al (2007a). Soil leachates treated with laterite showed significant retention of Pb, Cu, Ni, Cd and Zn related to sorption on Fe-coated quartz present in the amendment (Nayanthika et al, 2018). The removal of As, Sb and Pb by amorphous Al-Fe-oxides was also confirmed by Maji et al (2012) and Álvarez-Ayuso et al (2013).…”

“…The reduction of Cd by ~25% was also observed in an agricultural soil treated with sepiolite and palygorskite, which was correlated to the alkaline pH leading to cadmium stabilization even after 2 years (Zhu et al, 2010;Liang et al, 2014Liang et al, , 2016. Additional treatments have been applied in waste landfill leachates using laterite (30-100% removal) (Mohamad et al, 2018;Nayanthika et al, 2018). When smectites were applied, the leachate migration through the soil was inhibited not only by sorption, but also by minimizing the soil permeability, forming a barrier to contaminants (Ruiz et al, 2012).…”

“…Most static or dynamic sorption studies investigate selectivity and competition in laboratory multi-elemental aqueous solutions (Kubilay et al, 2007;Zhu et al, 2011;Chotpantarat et al, 2012;Bourliva et al, 2015;Nguyen et al, 2015). In some studies the artificial PTE solutions simulate industrial, agricultural or mining wastewaters and leachates (Ruiz et al, 2012;Vhahangwele & Mugera, 2015), whereas there are few recent studies that employ natural contaminated solutions (Arfaoui et al, 2005;Oubagaranadin et al, 2010;Mohamad et al, 2018;Nayanthika et al, 2018). Experiments showed that selectivity depends on the physicochemical properties of both the sorbate and the sorbent.…”