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IMPROVED ISOLATION OF CADMIUM FROM PADDY SOIL BY NOVEL TECHNOLOGY BASED ON PORE WATER DRAINAGE WITH GRAPHITE-CONTAINED ELECTRO-KINETIC GEOSYNTHETICS
Tang, X., Q. Li, Z. Wang, Y. Hu, Y. Hu, and M. Scholzy.
Environmental Science and Pollution Research 25:14244-14253(2018)

Two mutually independent field plot experiments A and B were conducted to test electrokinetic geosynthetics ability to isolate Cd in paddy soil. After saturation using ferric chloride (FeCl3) and calcium chloride (CaCl2), assessment of soil water drainage capacity, soil Cd removal performance, energy consumption, and residual soil iron and chloride was performed. Cd was dissolved in the soil matrix and resulted in a 100% increase of diethylenetriaminepentaacetic acid (DTPA)-extracted phyto-available Cd. The total soil Cd content reductions were 15.20% and 26.58% for groups A and B, respectively, and electric field applications resulted in a 74.87% increase of soil total Cd removal. Drainage by gravity contributed to > 90% of the overall soil dewatering capacity. Compared to conventional electrokinetic technology, fast soil water drainage resulted in negligible hydrogen ion and hydroxide ion accumulation at nearby electrode zones. External addition of FeCl3 and CaCl2 led to 4.33-7.59% and 139-172% acceptable augments in total Fe and Cl content compared to original untreated soils. This article is Open Access at https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5978830/pdf/11356_2018_Article_1664.pdf



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