tender for design, supply, transportation, construction, installation, testing, and commissioning of 3 nos. of sewage treatment plants (stps) of total 3.5 mld capacity at k ur mb (1 mld) using waste stabilization pond (wsp), digboi mb (1.5 mld) and titabar mb (1.0 mld) ) using activated sludge process (asp) or extended aeration (ea) or any mechanized technology as per cpheeo manual on design, build, and operate (dbo) basis with sewage pumping station, nallah/drain outfall interceptor and diversion works, along with all associated civil, electrical, mechanical, piping, and instrumentation works, as well as operation and maintenance (o&m) of the complete system for a period of five (05) years after successful commissioning under sbm (u) 2.0.