Enhanced anaerobic biodegradation of 17α-ethinylestradiol via a flow-through electrode.
Zheng J, Lei Z, Yang Y, Chen M, Chen R
Phytoremediation
The synthetic estrogen that passes through sewage treatment plants is quietly feminizing fish in the streams and rivers that feed your garden's watershed — this new electrode approach could finally stop it at the source.
A common synthetic hormone from birth control pills routinely slips through wastewater treatment and ends up in rivers and soil, where it disrupts wildlife. Scientists added a special electric electrode to the treatment tank, which encouraged hormone-eating bacteria to thrive and work harder. The result: nearly 90% of the hormone was destroyed instead of the usual 60%, using specific bacteria and enzymes that break the hormone's chemical structure apart.
Key Findings
Adding a flow-through electrode to anaerobic wastewater systems increased EE2 removal from 60.1% to 89.4% over long-term operation.
The electrode enriched specific hormone-degrading bacteria (Microbacterium and Methylobacterium) and electroactive bacteria (Geobacter and Pseudomonas) in the biofilm.
Metaproteomic analysis confirmed upregulation of key degradation enzymes (CYPs) that physically bind and break down the synthetic hormone via deethylation and ring-cleavage pathways.
chevron_right Technical Summary
Researchers found that adding a special electrode to anaerobic wastewater treatment systems nearly doubled the removal of a synthetic hormone (EE2, found in birth control pills) that normally survives sewage treatment and harms aquatic life.
Abstract Preview
Removal of 17α‑ethinylestradiol (EE2) remains a major challenge of anaerobic wastewater treatment technologies. In this study, we proposed and demonstrated that integrating a flow-through electrode...
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