Case studies of remediation of groundwater contamination and land subsidence/earth fissure in China

Department of Hydrology and Atmospheric Sciences
Special Seminar

Friday, November 8, 2019
11:00 am ~ Kisiel Conference Room, Harshbarger 232

Dr. Shujun Ye
Professor of Hydrogeology, Department of Hydrosciences
School of Earth Sciences and Engineering, Nanjing University

Abstract

Soil and groundwater pollution is a serious problem in China. The Chinese central and local governments very concern on the issue. The Ministry of Science and Technology of China budged 1.15 billion RMB for 33 key projects in 2018 and 22 key projects in 2019, which focus on remediation of soil and groundwater contamination in the sites. We have been working on a chlorobenzene-contaminated industrial site in Nanjing since 2012. Field investigation, risk assessment, source search, and remediation including bioremediation, chemical oxidation, electrokinetic treatment and natural attenuation were studied at the site. Natural attenuation and anaerobic benzene detoxification processes at the chlorobenzene-contaminated site were inferred from field investigations and microcosm studies.

Land subsidence caused by overly exploitation of groundwater is another serious problem in China. The subsidence-affected area with cumulative subsidence greater than 200 mm is more than 90,000 km2 and covers 22 provinces (cities), and more than 1,000 earth fissures accompanying the subsidence. We have been working on numerical simulation of land subsidence in the Yangtze Delta area, China since 2001. The regional land subsidence models including 3D groundwater model and 1D/3D geomechanic models were developed and applied to simulate and predict land subsidence in the Yangtze Delta Area. A nested two-scale approach associated with an original nonlinear elastoplastic finite element/interface element simulator were proposed to model the mechanics of earth discontinuities. and applied to model earth fissures in Wuxi City, the Yangtze Delta Area.

Bio

Dr. Shujun Ye is a professor of Hydrogeology in the Deptartment of Hydrosciences, School of Earth Sciences and Engineering at Nanjing University, China, and a member of the UNESCO Land Subsidence International Initiative (LaSII). She received her Bachelor degree from the Jilin University in 1997, and her Master degree from the Nanjing University (NJU) in 2000, then joined NJU as a lecturer. She received her Ph.D. from NJU in 2004. She was promoted to associate professor in 2005 and professor in 2012 at NJU. Her current interests of research are primarily in two areas. One is numerical modeling of ground water flow, including studies on numerical methods which are used to solve mathematical models of ground water flow, and studies on land subsidence and earth fissure simulation which are caused by overly ground water exploitation. The other is remediation of organic contaminants in ground water, including field investigation, risk assessment, lab experiments and numerical modeling. She focuses on bioremediation, chemical oxidation, electrokinetic treatment and natural attenuation, and the impact of these remediation on ground water flow, multiphase flow and mass transport in porous media and fractured media.