A sewage treatment plant does not fail all at once. It fails one skipped maintenance cycle at a time, until the gap becomes impossible to ignore.
What's Happening at the Plant
The sewage treatment plant serving the Government Medical College in Chevayur, Kozhikode, is running at roughly half its rated capacity, with insufficiently treated wastewater being discharged directly into the Canoli Canal. The facility comprises a 1 MLD plant and a 2 MLD plant, and the shortfall traces back to a basic maintenance failure: the reactor electrodes, which need replacement every six months, have not been changed since 2024.
The plant's previous contractors stopped work once their contract expired, leaving temporary staff appointed by the Corporation to keep the facility running in the meantime, without the parts needed to restore it to full treatment capacity.
Why a Missed Part Becomes a Pollution Story
Reactor electrodes are not a cosmetic component. In most STP configurations, they are central to the treatment process itself, and operating past their replacement interval degrades treatment efficiency well before the plant visibly fails. That is exactly the gap this case shows: a plant still technically running, still discharging water, but no longer treating it to the standard the design intended, with the difference going straight into a public waterway.
This is a pattern that shows up wherever an STP's annual maintenance contract (AMC) lapses or is left unrenewed during a contractor transition. Unlike total plant failure, inadequate treatment during a maintenance gap often goes unnoticed for months, since the plant appears operational even as what it discharges quietly falls short of safe limits.
The Cost of Letting It Slide
Authorities now estimate that replacing electrodes across both plants, along with activated carbon and sand for the filter tanks, will cost over ₹60 lakh, with the annual maintenance contract itself running close to ₹1 crore. Those are substantial figures for what began as a routine six-monthly part replacement, illustrating how deferred maintenance compounds rather than stays flat over time.
A functioning operation and maintenance contract exists precisely to prevent this kind of gap: a lapse during a contractor transition is a known risk point for any STP, and bridging it with continuity of service, rather than leaving a facility to run on temporary staff without replacement parts, is typically far cheaper than the eventual catch-up cost once a canal becomes the visible symptom of a maintenance failure.
What Happens Next
The Corporation plans to hire new contractors to resume full operations, though no timeline has been set. Until that happens, the Canoli Canal continues to receive wastewater that has not been treated to the plant's intended standard, a reminder that an STP's rated capacity on paper and what it actually delivers day to day can diverge quietly, long before anyone outside the plant notices.
Key Highlights
- The Government Medical College STP in Kozhikode is running at roughly half capacity
- Reactor electrodes due for replacement every six months have not been changed since 2024
- Insufficiently treated wastewater is being discharged into the Canoli Canal
- Fixing both plants is estimated to cost over ₹60 lakh, with an annual maintenance contract near ₹1 crore
