Cement-Based Solidification/Stabilization as a Pathway for Encapsulating Palm Oil Residual Biomass Post Heavy Metal Adsorption

Abstract

Heavy metal pollution is a serious issue currently affecting the environment and public health, which has been faced by applying several alternatives such as adsorption. In this work, the adsorption technique was employed to remove nickel and lead ions from an aqueous solution using palm oil residual biomass as a biosorbent. Desorption experiments were also conducted to evaluate the desorption capacity of this biomass over sorption–desorption cycles. The polluted biomass was used to prepare bricks (5 and 10% biomass content) to encapsulate heavy metal ions into the cement matrix. Both mechanical resistance and leaching testing were performed to determine the suitability of these bricks for construction applications. The experimental results revealed a good biosorbent dosage of 0.1 g/L. The highest desorption yields were calculated in 11 and 83.13% for nickel and lead, respectively. The compression resistance when 10% biomass was incorporated into the bricks was reported to be below the acceptable limit. Leaching testing suggested a successful immobilization of heavy metal ions onto the cement matrix. These results indicate that the application of this immobilization technique allows solving disposal problems of biomass loaded with heavy metal ions.

A Review on Cassava Residues as Adsorbents for Removal of Organic and Inorganic Contaminants in Water and Wastewater

“…In the literature, various parts of cassava are reported to be adsorbents used in the removal of heavy metals, for example, zinc ( [10][11][12][13]), copper ([11, 13-21]), lead ( [20][21][22][23][24][25][26][27][28]), cobalt ( [29,30]), vanadium [30], chromium ([13, 17, 30, 31]), and cadmium ( [12,15,[32][33][34]), dyes such as rhodamine B [35], direct red [36], methylene blue ( [36][37][38][39][40]), methyl orange [40], and reactive dyes [41], antibiotics ([22, 42-44]), phosphorous [45], biodiesel purifcation [46], organic pollutants from industrial efuents ( [29,47,48]), and free fatty acid [49]. In addition, ZnO nanoparticles synthesized from cassava starch are used as adsorbents [50].…”