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EEWR Brown Bag Seminar wtih Yiheng Tao and Heather Hunter, Graduate Students

Speaker: Yiheng Tao and Heather Hunter, Graduate Students
Series: EEWR Brown Bag Seminars
Location: Engineering Quad E225
Date/Time: Friday, October 19, 2018, 12:00:00 p.m. - 01:00:00 p.m.


Yiheng Tao: Technical and economic analyses of  the viability of large-scale carbon capture and  storage in China

Yiheng TaoThe coal industry in China, which consists of coal-mining, coal-fired power generation, and coal-to-chemicals industrial processing, is relocating from populated parts of East China to the vast and resource-rich west in an effort to reduce air pollution in the east. My ongoing research focuses on the Junggar Basin in Northwest China’s Xinjiang Province, where escalated carbon emissions are expected and where appears to have large deep saline aquifers suitable for geological carbon storage. Simulation of large-scale CO2 injection using vertically-integrated models should provide a realistic estimate of the CO2 storage capacity in the Junggar Basin as well as the rate at which that capacity can be utilized. Besides technical feasibility, I am interested in investigating what economics are needed to realize CCS in the Junggar Basin and how China’s current policy, including nation-wide carbon market and green financial system, can lead to CCS deployment in China.

Heather Hunter: Strontium removal from wastewater through coprecipitation with barite

Heather HunterThe precipitation of (Ba,Sr)SO4 solid solution can be used to remove both  barium and strontium from contaminated waters such as oil and gas produced water. Thermodynamic theory developed to describe the incorporation of elements in binary coprecipitation reactions is limited by the fact that in many systems kinetic and mechanistic processes have a significant effect. We use X-ray fluorescence (XRF) nanospectroscopy at the Hard X-ray Nanoprobe (HXN) Beamline at National Synchrotron Light Source II (NSLS-II) to quantify Sr incorporation into <10 µm-sized barite (BaSO4) particles. The quantitative, high resolution XRF data obtained at HXN show clearly that (Ba,Sr)SO4 solid solutions form during precipitation and that the amount of Sr incorporated varies widely among particles. We investigate the effect of saturation state on Sr incorporation and compare our results to predictions from thermodynamic models. In all cases we observed significantly more (11-118 times more) Sr incorporation than predicted, leading to dramatic increases in aqueous Sr removal. Our results suggest the possibility of selecting solution conditions to kinetically control the  incorporation of Sr during coprecipitation with barite by limiting sulfate  addition such that the barite saturation index remains less than ~3.