Investigation of the potential mobility of Pb, Cd and Cr(VI) from moderately contaminated farmland soil to groundwater in Northeast, China

Heavy metal contaminant remediation study of western Xiamen Bay sediment, China: Laboratory bench scale testing results

“…of experimental aeration rates (5-30 L/min) increasing oxygen content have no significant impact on the removal efficiencies of As, Cd, Cr, Cu, Ni and Zn from the contaminated sediment. This observation is consistent with other studies in metal remediation [24][25][26][27], although aeration shows effectiveness on removing volatile organic carbon due to oxidation [28][29][30][31]. Variation in solid (sediment) to liquid (solution) ratio (S:L ratio) on metal removal efficiency was tested using 0.20 M H 2 C 2 O 4 under aeration (5 L/min) for 16 h. When S:L ratio decreased from 1:10 to 1:50, metal removal efficiencies increased from 9% to 27% for Cd, from 21% to 35% for Cr, from 28% to 52% for Cu, from 23% to 46% for Ni and from 19% to 47% for Zn (Fig.…”

Adsorption and Desorption of Lead (Pb) in Sandy Soil Treated by Various Amendments

“…These mechanisms are pseudo-order 1 (R2=0.902) for soil, pseudo-order 2 for bentonite, crab meal and eggshells with respective coefficients of determination (R2=0.749, R2=R20, 985 and=0.915). These findings are consistent with the work of several researchers [11][12][13][14][15][16][17]. The low coefficient of determination for adsorption of Pb by bentonite suggests other competing mechanisms such as diffusion [14,18].…”

“…Ref. [15,40,41] reported that the number of negative sites increases with pH resulting in more pronounced Pb adsorption.…”

Preparation and mechanism of ultra-lightweight ceramics produced from sewage sludge

“…The concentration of total Pb was 6.07 mg kg −1 of DSS, and exceeded the value of threshold (≤5.00 mg kg −1 of hazardous waste) obviously. High leaching concentration of Pb would be harmful to the groundwater [23,24]. Depending on this case, more attention should be paid to the concentration of Pb in ULWC.…”