A breakthrough in wastewater treatment could soon reshape how cities and industries manage one of their most persistent challenges—cleaning water efficiently while cutting energy use. A team led by Zahra Abolhasanzadeh from Shahid Beheshti University in Tehran has demonstrated that pairing traditional biological treatment with a modest electrical boost can dramatically improve performance, achieving near-complete removal of organic pollutants and phosphorus while significantly reducing sludge and energy demand.
In a study published in *Environmental Science* (محیط شناسی), the researchers tested a sequencing batch reactor (SBR)—a widely used wastewater treatment method—enhanced with low-voltage electrochemical technology. Their results show that applying just 3 volts could push organic contaminant removal to 98%, compared with 60–70% in conventional SBRs. Phosphorus removal hit an impressive 99%, and ammoniacal nitrogen removal reached 69%, both well above typical biological system outputs.
“What excites us isn’t just the higher removal rates,” says Abolhasanzadeh. “It’s that we’re doing this with minimal energy input—under 2 kWh per cubic meter at optimal conditions—and improving sludge quality at the same time.” The sludge volume index (SVI), a key measure of sludge settleability, dropped to one-third of conventional levels when higher voltages were applied, suggesting easier dewatering and lower disposal costs.
For the energy sector, this could translate into real-world savings. Wastewater treatment plants are energy-intensive, often consuming 1–3% of a city’s electricity. By integrating low-voltage electrochemical cells, operators could reduce treatment time, cut chemical use, and lower overall power demand—all while meeting stricter nutrient discharge regulations.
The team tested both real and synthetic wastewater, ensuring the findings translate beyond the lab. They found that voltages below 5 volts delivered the best balance of performance and energy efficiency, making the approach scalable for retrofitting existing SBR systems.
“This isn’t about reinventing the wheel,” Abolhasanzadeh notes. “It’s about giving a second spin to a proven system with a small but smart electrical intervention.”
As water quality regulations tighten globally, such hybrid systems could become a cornerstone of next-generation treatment infrastructure—delivering cleaner water, greener operations, and a lighter load on the grid. The study, published in *Environmental Science* (محیط شناسی), points to a future where treatment plants do more with less, one volt at a time.