Design, Supply, Transportation, Construction, Installation, Testing, And Commissioning Of A 2.50 Mld Capacity Sewage Treatment Plant Stp At Haflong Municipality On A Design, Build, And Operate In Technology Such As Activated Sludge Process Design, Supply, Transportation, Construction, Installation, Testing, And Commissioning Of A 2.50 Mld Capacity Sewage Treatment Plant At Haflong Municipality On Dbo Basis Including Operation And Maintenance Of The Complete System