STP for Airports & Aviation Facilities

Airports are complex, multi-use facilities generating wastewater from passenger terminals, airline catering units, aircraft maintenance hangars, airport hotels, and staff facilities — each with distinct wastewater characteristics. A 5 MPPA airport generates 1,000–2,000 KLD of combined wastewater, with peaks driven by flight schedules that produce 6–8 hour surges well above daily average flow. Under MoEFCC environmental clearance conditions and AAI guidelines, STPs are mandatory for airports of all categories, and CPCB Consent to Operate must be maintained to avoid closure notices. India's airport expansion programme — both greenfield and brownfield development — makes compliant airport STP design an active infrastructure priority. Learn more about our sewage treatment plant capabilities.

The primary challenge in airport STP design is stream management. Terminal kitchens and airline catering units produce high-FOG wastewater requiring grease interceptors before biological treatment. Aircraft maintenance facilities generate oily wastewater that requires an API or CPI oil-water separator before entering the biological stage. These pre-treated streams combine with regular domestic sewage in the equalisation tank before MBBR or MBR biological treatment. MBR is increasingly preferred for airports where treated water must meet Class B reuse quality for runway washdowns and toilet flushing without additional polishing steps. See our pages on DAF/dissolved air flotation and MBR technology for further detail.

Spans Envirotech designs and supplies STP systems for airports from 200 KLD to 5 MLD, with modular expansion capability as passenger volumes grow. Our airport STP designs are engineered for unattended or low-staffed operation through SCADA monitoring with mobile alerts, with treated water reuse distribution networks integrated into the STP project scope to maximise the return on investment from treated water reuse.