Enhanced in-situ biodegradation and aquifer permeability reduction

Stewart W. Taylor, Peter R. Jaffe

Research output: Contribution to journalArticle

36 Scopus citations

Abstract

A model describing the enhanced in-situ biodegradation of an organic substrate in ground water is presented. This model simulates the transport and aerobic utilization of substrate and oxygen; the transport and growth of biomass dispersed in the water phase and in the biofilm; changes in porous-media properties as a result of biofilm growth; and biofilm shearing and filtration. The model is applied to a recharge well to simulate the injection of an electron donor (substrate) and electron acceptor (oxygen) into an aquifer. Results show that a porous medium having a high porosity, wide range of pore sizes, and a small maximum pore radius is most susceptible to biofouling; and alternately pulsing the electron donor and acceptor reduces the biofouling propensity. The model is also applied to a hypothetical aquifer to simulate the process of bioremediation. Results show that increasing the oxygen concentration in the injection water, increasing the well-pumping rate, and introducing oxygen through multiple injection wells all result in improved levels of bioremediation without causing excessive biofouling.

Original languageEnglish (US)
Pages (from-to)25-46
Number of pages22
JournalJournal of Environmental Engineering (United States)
Volume117
Issue number1
DOIs
StatePublished - Jan 1 1991

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Civil and Structural Engineering
  • Environmental Science(all)

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