Key Questions
Does a hospital need both an ETP and an STP?
Usually, yes. A hospital's sewage from wards, staff areas and kitchens goes to an STP, while laboratory and diagnostic effluent is segregated and treated in a separate ETP first. Navbharat Water built exactly this arrangement for KMV Projects Hospital in Chaibasa: a 550 KLD STP with a 100 KLD ETP.
The reason is chemistry. Laboratory and diagnostic effluent can carry reagents, disinfectants and chemical residues that inhibit the bacteria a biological STP depends on, so mixing it straight into the sewage line risks upsetting the whole plant. Segregating it at source keeps the volume small and lets the ETP use the right process, typically neutralisation, physico-chemical treatment and disinfection, before the treated stream joins the sewage or is disposed of as the consent allows. The STP then handles the larger domestic flow from wards, outpatient areas, staff quarters and kitchens, with grease traps ahead of the kitchen line. Laundry water and dialysis or RO reject are assessed separately: laundry adds detergents and heat, while RO reject is relatively clean but high in dissolved salts and can often be reused for flushing or landscaping. The exact split, and the discharge limits, are set by the State Pollution Control Board consent for each hospital.
How is hospital sewage disinfected and reused?
After biological treatment in an MBR, MBBR or SBR STP, hospital sewage is disinfected by chlorination or UV before any discharge or reuse. Treated water is commonly reused for toilet flushing, cooling tower make-up and landscaping, which reduces the hospital's freshwater demand.
Disinfection matters more in a hospital than in most buildings because the sewage can carry pathogens from patients. It is placed after biological treatment and filtration, when suspended solids are low enough for chlorine or UV to work reliably. An MBR STP is well suited to space-constrained hospitals: its ultrafiltration membranes replace the secondary clarifier, so the plant fits a smaller footprint and the permeate is already low in solids before disinfection. MBBR and SBR remain good options where space allows. Reuse needs dual plumbing, so it is easiest to plan in a new building or a major expansion. Discharge limits follow the 2017 notification for STPs, BOD 30 mg/L or 20 mg/L in metro cities, although the NGT or the State Pollution Control Board may set stricter limits for a particular site. Navbharat Water designs the reuse quality around the intended use and the consent conditions.
Which hospitals has Navbharat Water built treatment plants for?
Navbharat Water has delivered a 10 KLD ETP for Tata Memorial Hospital in Mumbai, a combined 550 KLD STP and 100 KLD ETP for KMV Projects Hospital in Chaibasa, Jharkhand, and dual-train 1000 LPH and 500 LPH RO systems for L&T Construction at AIIMS Madurai.
Each project covers a different part of a hospital's water cycle. At Tata Memorial Hospital, India's premier cancer institute, the 10 KLD ETP treats clinical and diagnostic effluent to MPCB discharge norms, the laboratory-effluent stream that should never go untreated into a sewage plant. At KMV Projects Hospital, the combined 550 KLD STP and 100 KLD ETP serve the whole hospital complex and were built for full compliance with Jharkhand SPCB standards. At AIIMS Madurai, delivered for L&T Construction, the two RO trains supply 1000 LPH and 500 LPH of purified water for clinical and utility needs. Together they show the three systems most hospitals need: an ETP for laboratory effluent, an STP for sewage and a water treatment or RO plant for clinical and utility water. Each project has its own case-study page, linked in the projects section below.
How do you keep a hospital treatment plant running 24×7?
A hospital plant cannot be shut down for maintenance, so reliability is designed in: standby pumps and blowers, equalisation to absorb peaks, and a maintenance plan that works around live operation. Navbharat Water can run the plant under an O&M contract, with operators, lab testing and compliance records.
Most hospital plant failures are not design failures; they are operating failures. A blower trips at night, a dosing pump drifts, sludge accumulates, and nobody notices until the outlet fails or an inspection finds blank logbooks. Designing for a hospital therefore starts with duty and standby equipment on critical pumps and blowers, enough equalisation volume to ride through peaks, and access that lets one unit be serviced while the other runs. Operation then does the rest. Under an AMC or comprehensive O&M contract, Navbharat Water provides trained operators, preventive maintenance, routine lab testing, disinfection checks, sludge handling and the registers that State Pollution Control Board consent renewals rely on. Existing hospital plants built by other suppliers can be taken over after a site audit and rectification. Connected plants can also stream flow and quality data to Navbharat Water's Smart Water dashboard, so drift is caught between site visits.