A Numerical Approach to Simulate the Biogeochemical Involvement in a Coastal Reduced Groundwater Environment

作者：Pradeep Edangodage Duminda^*; Jinno Kenji

来源：Water, Air, and Soil Pollution, 2010, 207(1-4): 369-389.

DOI：10.1007/s11270-009-0143-4

• Bacteria-mediated reduction
• Chemical transport/reactions
• Coastal aquifer
• Density-dependent flow
• Organic carbon

Bacteria-mediated reduction processes play a decisive role in the water quality alterations in the subsurface environment of coastal aquifers. Availability of organic carbon as the electron donor with other electron acceptors such as NO(3) (-), MnO(2), Fe(OH)(3) and SO(4) (2-) induces different bacteria to activate under aerobic and anaerobic conditions. A two-dimensional reactive transport model has been developed to simulate the bacteria-mediated reduction reactions in a coastal aquifer. The model explains the utilisation of O(2), NO(3) (-), MnO(2), Fe(OH)(3) and SO(4) (2-) as electron acceptors for the oxidation of organic carbon in the aquifer under aerobic and anaerobic conditions. The conceptual model consists of three different phases named as bio phase, mobile phase and matrix phase. Model parameters are adopted from literature on bacteria-mediated multi-component modelling and bioremediation processes. Monod kinetic equation is assumed to formulate the bacterial growth. The model explains the behaviours of aerobic and anaerobic bacteria under the availability of organic carbon. Two scenarios are tested and numerical results are discussed. The present numerical study highlights the possibility of the simulation of the formation of reduced environments in coastal aquifers which has not received much attention of groundwater modelling community yet.

• 出版日期2010-3