Deducing the distribution of terminal electron-accepting processes (TEAPs) in hydrologically

diverse groundwater systems

Chappelle et al. (1995)Water Resources Research, Vol 31, No. 2

Introduction

•The Importance•The Problem•The Alternative

I TEAPs It Real

• The Basics• Water chem can determine TEAPs by

1. Tracking electron acceptor consumption2. Tracking final product accumulation3. Tracking intermediate product concentrations

• Previous studies fail to TEAPs it real• Hydrogen (H2) concentrations an important

intermediate product indicator of TEAPs

PURPOSE OF

THEPAPER

Hierarchical Framework for Identifying TEAPs

STUDYSITES

Black Creek Aquifer, South Carolina

Black Creek Aquifer, South Carolina

Floridan Aquifer - Baldosta, Georgia

Floridan Aquifer - Baldosta, Georgia

Alluvial-Lacustrine Aquifers – San Joaquin Valley

Alluvial-Lacustrine AquifersSan Joaquin Valley

Petroleum Hydrocarbon-Contaminated Aquifer: Hanahan, South Carolina

Petroleum Hydrocarbon- Contaminated Aquifer:

Hanahan, South Carolina

CONCLUSIONS

• The main, important observation is that H2 concentration ranges for different TEAPs are consistent between the diverse hydrologic systems studied

• H2 Concentrations are a useful indicator for TEAPs and increase confidence when used in conjunction with electron acceptor consumption and final product production.