Updated: April 30, 2021 13:38 IST Inspection by officials found the CETP discharging effluents from its tank into a defunct oxidation pond. Share Article AAA The Perundurai District Environmental Engineer inspected the CETP on April 18 following complaints, and found the CETP discharging effluents from its tank into a defunct oxidation pond. | Photo Credit: Special Arrangement Inspection by officials found the CETP discharging effluents from its tank into a defunct oxidation pond. The chairman of the Tamil Nadu Pollution Control Board (TNPCB) has directed officials here to close down the Common Effluent Treatment Plant (CETP), run by tannery units, at the SIPCOT Industrial Growth Centre, Perundurai.