Waste green sands as reactive media for the removal of zinc from water.
Waste green sands are industrial byproducts of the gray iron foundry industry. These green sands are composed of fine silica sand, clay binder, organic carbon, and residual iron particles. Because of their potential sorptive and reactive properties, tests were performed to determine the feasibility of using green sands as a low cost reactive medium in permeable reactive barriers (PRBs). Serial batch kinetic tests and conventional batch sorption tests were conducted to determine the removal characteristics for zinc in aqueous solutions. Removal characteristics for zinc in the presence of green sands are comparable to those of Peerless iron, a common reactive medium used in PRBs. High removal capacities for zinc of green sands are attributed to clay, organic carbon, and residual iron particles, which are known sorptive media for heavy metals. Furthermore, high pH values in the presence of clay and residual iron particles enhanced sorption and precipitation of zinc.
Lee
Taeyoon
T
Construction Environment Research Department, Korea Institute of Construction Technology, 2311 Daehwa-Dong, Ilsan-Gu, Goyang-Si, Gyeonggi-Do 411-712, South Korea. badger74w@kict.re.kr
Park
Jae-woo
JW
Lee
Jae-Ho
JH
D000327:Adsorption; D000538:Aluminum Silicates / Q000737:chemistry; D002244:Carbon / Q000737:chemistry; D000077215:Clay; D007501:Iron / Q000737:chemistry; D007700:Kinetics; D008669:Metallurgy; D010316:Particle Size; D012822:Silicon Dioxide / Q000737:chemistry*; D014866:Waste Products; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*; D015032:Zinc / Q000737:chemistry*
D000538:Aluminum Silicates; D014866:Waste Products; D014874:Water Pollutants, Chemical; D002244:Carbon; D012822:Silicon Dioxide; D007501:Iron; D015032:Zinc; D000077215:Clay