• Phyto-restoration Potential of Soil Properties using Secale cereale for Recycle of Soils with Residual TPHs (Total Petroleum Hydrocarbons) after Off-site Treatment
  • Park, Jieun;Bae, Bumhan;Joo, Wanho;Bae, Seidal;Bae, Enjoo;
  • Department of Civil and Environmental Engineering, Gachon University;Department of Civil and Environmental Engineering, Gachon University;HplusEco, Ltd.;HplusEco, Ltd.;HplusEco, Ltd.;
  • 잔류유분 함유 반출처리토 재활용을 위한 호밀 식재 식물상 토성회복 가능성
  • 박지은;배범한;주완호;배세달;배은주;
  • 가천대학교 토목환경공학과;가천대학교 토목환경공학과;(주)에이치플러스에코;(주)에이치플러스에코;(주)에이치플러스에코;
Abstract
The amount of TPH contaminated soil treated at off-site remediation facilities is ever increasing. For the recycle of the treated-soil on farmlands, it is necessary to restore biological and physico-chemical soil characteristics and to remove residual TPH in the soil by an economic polishing treatment method such as phytoremediation. In this study, a series of experiments was performed to select suitable plant species and to devise a proper planting method for the phyto-restoration of TPH-treated soil. Rye (Secale cereale) was selected as test species through a germination test, among 5 other plants. Five 7-day-old rye seedlings were planted in a plastic pot, 20 cm in height and 15 cm in diameter. The pot was filled with TPH-treated soil (residual TPH of 1,118 mg/kg) up to 15 cm, and upper 5 cm was filled with horticulture soil to prevent TPH toxic effects and to act as root growth zone. The planted pot was cultivated in a greenhouse for 38 days along with the control that rye planted in a normal soil and the blank with no plants. After 38 days, the above-ground biomass of rye in the TPH-treated soil was 30.6% less than that in the control, however, the photosynthetic activity of the leaf remained equal on both treatments. Soil DHA (dehydrogenase activity) increased 186 times in the rye treatment compared to 10.8 times in the blank. The gross TPH removal (%) in the planted soil and the blank soil was 34.5% and 18.4%, respectively, resulting in 16.1% increase of net TPH removal. Promotion of microbial activity by root exudate, increase in soil permeability and air ventilation as well as direct uptake and degradation by planted rye may have contributed to the higher TPH removal rate. Therefore, planting rye on the TPH-treated soil with the root growth zone method showed both the potential of restoring biological soil properties and the possibility of residual TPH removal that may allow the recycle of the treated soil to farmlands.

Keywords: Phytoremediation;Residual TPH removal;Root growth zone;rye;TPH polishing;

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This Article

  • 2014; 19(3): 25-32

    Published on Jun 30, 2014

  • 10.7857/JSGE.2014.19.3.025
  • Received on Jan 13, 2014
  • Revised on Jun 3, 2014
  • Accepted on Jun 3, 2014