HNB Engineers emerges as L1 bidder for implementation of 25 mgd to 40 mgd STP Upgradation (Yamuna Vihar Ph-3) and 15 mgd STP Construction (Yamuna Vihar Ph-4) Project in Delhi July 21, 2026 | Awarded, Key Segments, Municipal Wastewater, Project Updates, Wastewater HNB Engineers Private Limited has emerged as Lowest (L1) bidder for the implementation of 25 mgd to 40 mgd STP … This content is restricted.