How do microbes clean up pollution?

Many microorganisms can use organic pollutants as food, breaking them down through metabolism into simpler, less harmful substances such as carbon dioxide and water; bioremediation creates conditions that encourage this natural degradation.

What is the difference between biostimulation and bioaugmentation?

Biostimulation enhances the activity of microbes already present at a site by adding nutrients or oxygen, while bioaugmentation introduces specially selected or cultured microorganisms; which approach is used depends on the contaminant and the native microbial community.

Bioremediation

Bioremediation uses microorganisms or plants to degrade, transform, or immobilize contaminants in the environment.

Definition

The application of living organisms, principally microorganisms but also plants, to degrade, transform, or immobilize environmental contaminants into less harmful forms.

Scope

This topic covers the use of biological agents to clean up contamination. It addresses how microorganisms metabolize organic pollutants into less harmful products, the distinction between stimulating native organisms (biostimulation) and adding cultured organisms (bioaugmentation), the application of bioremediation in situ and ex situ, and the environmental conditions that control biological activity. Plant-based phytoremediation is treated as a related approach.

Core questions

How do microorganisms degrade organic contaminants?
What is the difference between biostimulation and bioaugmentation?
What conditions control the rate of bioremediation?
Which contaminants are amenable to biological treatment?

Key theories

Microbial degradation of organics: Microorganisms can use many organic contaminants as carbon and energy sources, oxidizing them, ideally to carbon dioxide and water, so bioremediation harnesses this natural metabolism to break down pollutants.
Biostimulation versus bioaugmentation: Bioremediation can be enhanced either by supplying nutrients, oxygen, or other amendments to stimulate existing microbes, or by introducing specialized cultured organisms, with the appropriate strategy set by site conditions and contaminant type.

Clinical relevance

Bioremediation offers a relatively low-cost, low-disturbance route to treat organic contamination such as petroleum and many solvents; matching biological capability to contaminant and site conditions determines its effectiveness.

Evidence & guidelines

Bioremediation design relies on understanding microbial metabolism and the environmental factors that limit it; this is described here to explain the approach rather than as prescriptive guidance.

History

Interest in bioremediation grew through the 1980s and 1990s, with high-profile application to oil-spill cleanup demonstrating that stimulating microbial degradation could accelerate the breakdown of hydrocarbon contamination.

Key figures

Ronald M. Atlas

Seminal works

atlas1991
suthersan1996
manahan2017

Frequently asked questions

How do microbes clean up pollution?: Many microorganisms can use organic pollutants as food, breaking them down through metabolism into simpler, less harmful substances such as carbon dioxide and water; bioremediation creates conditions that encourage this natural degradation.
What is the difference between biostimulation and bioaugmentation?: Biostimulation enhances the activity of microbes already present at a site by adding nutrients or oxygen, while bioaugmentation introduces specially selected or cultured microorganisms; which approach is used depends on the contaminant and the native microbial community.