Solidification/stabilisation of arsenic bearing fly ash from the metallurgical industry. Immobilisation mechanism of arsenic

Heavy Metal Leaching, CO2 Uptake and Mechanical Characteristics of Carbonated Porous Concrete with Alkali-Activated Slag and Bottom Ash

“…However, the leached concentration of As in PC2 specimen was relatively lower than that from the NS2 and SS2 specimens. Vandecasteele et al reported that As can be reacted with Ca(OH) 2 in OPC paste to form the insoluble Ca 3 (AsO 4 ) (Vandecasteele et al 2002). In contrast, Ca(OH) 2 is not present in the AAS matrix (Shi and Fernandez-Jimenez 2006).…”

Environmental, technical and technological aspects of hazardous waste management in Poland

“…Obtained sediments are dehydrated in order to decrease their volume. The solid waste is subject to processes of solidification in a matrix of Portland cement with an addition of calcium, iron compounds and fly ashes [24][25][26][27][28][29][30].…”

Environmental Pollution Remediation through Solidification/Fixation of Heavy Metal Ions in Portland Cement

“…The only sample in the study showing reasonable leaching performance was that using Portland cement alone, at a dosage of 1.0 part soil in 0.44 part cement. While the research to date indicates that the use of iron, lime and cement can be beneficial in the solidification/stabilization of arsenic, it is difficult to differentiate between the results obtained by the numerous researchers and draws any firm conclusions on which S/S processes are the most efficient and effective [72][73][74][75][76][77]. Despite the extensive efforts by several researchers, there is very less data reported in the literature especially about the quantitative effects of addition of different metal ions on initial and final setting times of ordinary Portland cement, therefore, efforts have been made to fill void in this data.…”

“…Besides water or other solvents e.g., citric acid, to simulate the effect of soil acids or of acid rain [82][83][84][85]. Leaching tests can also be used for durability testing, although they do not reflect in all cases the real situation, where a bulky structure is attacked instead of a powder [77,[86][87][88][89][90]. Amal et al investigated the microstructure of cementitious wastes containing different metal ions like Pb, Cd, As and Cr and examined the implications of the microstructure on the leaching of the heavy metal ions [91].…”