The significance of microbial processes in hydrogeology and geochemistry
Hydrogeology Journal
By: F. H. Chapelle
Links
- More information: Publisher Index Page (via DOI)
- Download citation as: RIS | Dublin Core
Abstract
Microbial processes affect the chemical composition of groundwater and the hydraulic properties of aquifers in both contaminated and pristine groundwater systems. The patterns of water-chemistry changes that occur depend upon the relative abundance of electron donors and electron acceptors. In many pristine aquifers, where microbial metabolism is limited by the availability of electron donors (usually organic matter), dissolved inorganic carbon (DIC) accumulates slowly along aquifer flow paths and available electron acceptors are consumed sequentially in the order dissolved oxygen > nitrate > Fe(III) > sulfate > CO2 (methanogenesis). In aquifers contaminated by anthropogenic contaminants, an excess of available organic carbon often exists, and microbial metabolism is limited by the availability of electron acceptors. In addition to changes in groundwater chemistry, the solid matrix of the aquifer is affected by microbial processes. The production of carbon dioxide and organic acids can lead to increased mineral solubility, which can lead to the development of secondary porosity and permeability. Conversely, microbial production of carbonate, ferrous iron, and sulfide can result in the precipitation of secondary calcite or pyrite cements that reduce primary porosity and permeability in groundwater systems.
Suggested Citation
Chapelle, F.H., 2000, The significance of microbial processes in hydrogeology and geochemistry: Hydrogeology Journal, v. 8, no. 1, p. 41-46, https://doi.org/10.1007/PL00010973.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | The significance of microbial processes in hydrogeology and geochemistry |
| Series title | Hydrogeology Journal |
| DOI | 10.1007/PL00010973 |
| Volume | 8 |
| Issue | 1 |
| Year Published | 2000 |
| Language | English |
| Publisher | Springer |
| Contributing office(s) | Toxic Substances Hydrology Program |
| Description | 6 p. |
| First page | 41 |
| Last page | 46 |