Influence of sewage and pharmaceuticals on soil microbial function
Gerty J H P Gielen1, Peter W Clinton, Michael R Van den Heuvel
1Scion, Rotorua, New Zealand. gerty.gielen@scionresearch.com
Environmental Toxicology and Chemistry
|February 12, 2011
Summary
Sewage effluent irrigation with pharmaceuticals alters soil microbial communities. Prior exposure to ambient pharmaceutical levels primes microbes, enhancing their resilience to high pharmaceutical concentrations and improving soil health.
Area of Science:
- Environmental Science
- Soil Science
- Microbiology
Background:
- Sewage effluent irrigation recycles water and nutrients but introduces bioactive pharmaceuticals.
- Pharmaceuticals in effluent can negatively impact soil microbial communities and soil quality.
- Disentangling pharmaceutical effects from other effluent constituents is challenging.
Purpose of the Study:
- To assess the impact of high pharmaceutical concentrations on soil microbial properties.
- To evaluate the effect of long-term, low-level effluent irrigation on microbial function.
- To determine if prior effluent exposure enhances microbial resilience to acute pharmaceutical stress.
Main Methods:
- Comparison of soil microbial communities with and without 12 years of sewage effluent irrigation.
- Exposure of these communities to high levels of specific pharmaceuticals (acetaminophen, aspirin, carbamazepine, chlorpromazine, tetracycline).
- Measurement of soil microbial respiration (CO2), biomass carbon, and substrate utilization.
Main Results:
- High pharmaceutical concentrations induced stress, evidenced by increased CO2 respiration, reduced biomass carbon, and altered substrate utilization.
- Prolonged effluent irrigation modified the soil microbial genetic profile.
- Pre-exposed microbial communities showed mitigated responses to high pharmaceutical loads and degraded salicylic acid after aspirin exposure.
Conclusions:
- Long-term exposure to ambient pharmaceutical levels in sewage effluent enhances soil microbial community resilience.
- Microbial communities adapted to effluent irrigation can better withstand acute pharmaceutical contamination.
- This adaptation suggests a potential for improved soil health management in wastewater irrigation systems.
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