Enhanced remediation of arsenic and chromium co-contaminated soil by eletrokinetic-permeable reactive barriers with different reagents

Phytoremediation of Heavy Metal Pollution: A Bibliometric and Scientometric Analysis from 1989 to 2018

“…These technologies include the use of exogenous substances (e.g., organic additives, inorganic additives, fertilizers, auxin applications, exogenous inoculation of bacteria, and microorganisms) [111,112,113,114]. Recently, more attention has been paid to the effects of bacteria/microorganisms on the uptake of HMs in plants [115,116,117]. In particular, it is possible to gain insights into the enhanced effect of plant-associated microbes, noncultivatable microorganisms in the roots of hyperaccumulators, and genetically engineered microbes/plants [118,119,120].…”

A Novel Method for Treating Heavy Metal-Contaminated Soil: The Combined Electrokinetics and Permeable Reactive Barrier Technique

“…Commonly used materials include zero-valentiron (Fe(0)), activated carbon (AC), zeolite, lime, apatite, transformed red mud (TRM), and biologically reactive materials (Zijlstra et al, 2010;Vermeul et al, 2014;Ranjbar et al, 2017;Vukojević Medvidović et al, 2018;Gibert et al, 2019;Grau-Martí nez et al, 2019;Huang et al, 2019). Pollutants that can be removed with the PRB technique include organic pollutants such as chlorinated hydrocarbons, polychlorinated biphenyls, polyaromatic hydrocarbons, and the benzene series (Chang and Cheng, 2006;Chen et al, 2011;Du et al, 2013; heavy metal and metalloid pollutants including nickel (Ni), copper (Cu), zinc (Zn), lead (Pb), Cd, selenium (Se), arsenic (As), chromium (Cr), and mercury (Hg) (Huang et al, 2015;Robles et al, 2015;Han et al, 2016;Ranjbar et al, 2017;Medvidović et al, 2018;Huang et al, 2019;Xu et al, 2019); radioactive materials such as caesium-137 and strontium-90 (Vermeul et al, 2014;Torres et al, 2017); and inorganic salt pollutants such as nitrate (Li et al, 2017;Gibert et al, 2019). Therefore, PRB is a very promising technique.…”

“…The Fe(0) PRB can also effectively reduce levels of Cd, Ni, Pb, Cu and other heavy metal ions, and significantly improve their stability. In the process of EK-PRB remediation, relative to the zeolite PRB, unstable forms of the four heavy metals fixed in the barrier materials decreased by 61, 60, 61, and 57%, respectively, in a zeolite/Fe(0) iron PRB (Ma et al, 2012 (De Gioannis et al, 2008;Xu et al, 2016;Zhao et al, 2016;Xu et al, 2017Xu et al, , 2019Yu et al, 2019). AC has an extremely large specific surface area and removes heavy metal elements that migrate to its surface through adsorption.…”

Hazardous wastes treatment technologies

“…Results indicated that Cr(VI) removal was 99% and reduced to Cr(III). Xu, Li, et al (2019) studied the removal of As and Cr from soils using EK‐PRB system filled with CaAl‐layered double hydroxide (CaAl‐LDH) and reducing agents (ascorbic acid, sodium citrate) or chelating agent (Na 2 EDTA). The result showed that in the presence of 50 mM of sodium citrate, the As(V) and Cr(VI) removal was 50.5% and 44.1%, respectively, whereas, the As and Cr(VI) removal was 26.3% and 54.28% in the presence of 10 mM of Na 2 EDTA was used.…”

“…Mokhtari et al (2019) reported that a biosurfactant, rhamnolipid, enhanced the removal of n‐hexane from air by BTF. Xu, Bai, Tang, et al (2019), Xu, Bai, Li, Zhao, et al (2019), Xu, Wei, et al (2019), Xu, Zheng, et al (2019), Xu, Wang, and Zhu (2019), Xu, Zhao, Li, et al (2019), Xu, Tan, et al (2019), Xu, Li, et al (2019) investigated the removal of dichloromethane (DCM) and co‐existed toluene from pharmaceutical industrial gas streams using airlift packing reactor (ALPR), a combination of suspended and fixed‐film microbial growth system. The result showed ALPR better performed traditional airlift reactor (ALR) due to a microbial community more significantly augmented for the removal of recalcitrant VOCs.…”