Bioavailability of water-polluting sulfonoaromatic compounds

Area of Science:

• Environmental microbiology
• Biochemistry
• Industrial chemistry

Background:

• Highly substituted arenesulfonates are chemically stable and widely used industrially.
• These compounds are generally considered recalcitrant and poorly biodegradable in the environment.

Purpose of the Study:

• To investigate the microbial degradation of aromatic sulfonates.
• To identify bacteria capable of utilizing the sulfonate group of arenesulfonates.
• To determine the environmental prevalence of aromatic sulfonate degradation pathways.

Main Methods:

• Enrichment cultures were used to isolate bacteria capable of desulfonating 14 different arenesulfonate compounds.
• Products of desulfonation were identified, typically as the corresponding phenols.
• Pure cultures, such as Pseudomonas putida S-313, were used for quantitative analysis of degradation pathways.

Main Results:

• Mixed microbial cultures were successfully enriched for the desulfonation of all 14 tested arenesulfonates.
• The primary degradation products were identified as phenols, many of which are known to be biodegradable.
• Pure culture studies confirmed the generation of phenols from arenesulfonates, indicating specific enzymatic activities.

Conclusions:

• The capacity for extensive aromatic sulfonate degradation is likely widespread in the environment.
• Degradation pathways are distributed among various microorganisms and environmental conditions.
• Aromatic sulfonates, despite their stability, can be effectively processed by microbial communities, with phenols as key intermediates.