London: Harmful organic substances, such as pharmaceutical residues, can be efficiently removed from wastewater using only electricity, say scientists who tested a process called pulsed corona discharge (PCD).
Electricity can remove drug residues from wastewater
Pilot tests by researchers from Lappeenranta University of Technology (LUT) in Finland showed that pharmaceutical residues, their variants and other similar compounds degrade easily from wastewater because the process is non-selective.
The study also revealed that the momentary reformation of pharmaceutical substances can be considered a normal part of the reaction chain in the purification process. It nevertheless makes the comparison of different technologies more difficult and highlights the importance of a non-selective process. The results gave important new information on energy efficient oxidation, which is significant also in terms of the further development of the technology.
The efficiency of the process depends on temperature, flow rates, delays, and the location of the process in the wastewater treatment chain.