논문 국내 국내전문학술지(KCI급) 균질한 매질 내 Calcium polysulfide 주입에 따른 고농도 중금속 오염 지하수 정화 타당성 검토
- 학술지 구분 국내전문학술지(KCI급)
- 게재년월 2023-04
- 저자명 고현우, 주진철, 남경필, 문희선, 윤성희, 이동휘, 장소예
- 학술지명 한국지하수토양환경학회지
- 발행처명 한국지하수토양환경학회
- 발행국가 국내
- 논문언어 한국어
- 전체저자수 7
- 연구분야 공학 > 환경공학
- 원문 링크 https://doi.org/10.7857/JSGE.2023.28.1.001
홈페이지논문 초록 (Abstract)
In this study, column tests using relatively uniform Jumunjin sand media were conducted to evaluate the feasibility of calcium polysulfide (CaSx, CPS) in removing high concentration of Zn2+ in groundwater. The injected CPS solution reacted rapidly with Zn2+ in artificial groundwater and effectively reduced Zn2+ by more than 99% through metal sulfide precipitation. Since the density (d = 1.27 g/cm3) of CPS solution was greater than that of water, CPS solution settled down rapidly while capturing Zn2+ and formed stable CPS layer similar to dense nonaqueous phase liquid. Mass balance analysis on Zn2+ in CPS solution suggested that CPS solution effectively reacted with Zn2+ to form metal sulfide precipitates except for high groundwater seepage velocity of 400 cm/d. With greater groundwater seepage velocity, injected CPS did not completely dissolve at the CPS-water interface, but a partially-misible CPS layer continuously moved and reacted with Zn2+ in the direction of groundwater flow. Since hydraulic conductivity (Kh) decreased slightly due to the generated metal precipitates in the inter-pores of media, injection of CPS solution should be optimized to prevent clogging. As evidenced by both XRF and SEM/EDS results, ZnS precipitates were clearly observed through the reaction between the CPS solution and Zn2+. Further study is warranted to evaluate the feasibility of CPS to remove high-concentration heavy metalcontaminated groundwater in complex and heterogeneous media.