Antibiotic pretreatment for wastewater backfires on cleanup bacteria
Wang Y, Wen J, Wang S, Zhu X, Wu J
Soil Health
If you've ever wondered what happens after water swirls down the drain, this study shows how a single pretreatment misstep can let harmful bacteria take over a treatment system meant to keep phosphorus out of your local streams and lakes.
Wastewater treatment plants use helpful bacteria to soak up excess phosphorus so it doesn't pollute rivers and lakes. This study tried adding a chemical pretreatment step to break down a stubborn antibiotic first, but the pretreatment accidentally killed off the good phosphorus-removing bacteria and let a different, less helpful microbe take over, causing phosphorus removal to crash from 98 down to just 11 milligrams per liter.
Key Findings
Phosphorus accumulation in the treatment system dropped sharply from 98.12 to 11.08 mg/L after adding the Fenton (Schorl/H2O2) pretreatment effluent
The abundance of the key phosphorus-removing microbe Casimicrobium huifangae fell from 13.6% to 2.3%, while the organophosphorus-degrading microbe Acidovorax sp. KKS102 rose from 0.8% to 14.3%
Key functional genes for phosphate accumulation and release (PPK2, yjcG, PhaC) decreased, while pathways for oxidative stress response and phosphonate/phosphinate metabolism increased
chevron_right Technical Summary
Scientists tested a pretreatment method to break down an antibiotic in wastewater before biological phosphorus removal, but found it accidentally wiped out the beneficial bacteria that do the phosphorus removal, cutting efficiency by nearly 90%.
Abstract Preview
Original paper
Impact of the Fenton pretreatment on enhanced biological phosphorus removal: emphasizing variations in microbial community and metabolism.
The enhanced biological phosphorus removal (EBPR) process is widely used to remove inorganic phosphorus from wastewater. Phosphorus-accumulating organisms (PAOs) play a central role in this process...
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