Aamir Khan Decentralized wastewater treatment system (DEWATS or DWTS) for medium strength wastewater. Aamir khan - Islamabad IESE (SCEE) NUST 2019 - 73p. H.B - MS Environmental Engineering . Thesis MS EE Subjects--Topical Terms: Environmental Engineering LC Class. No.: 628 Dewey Class. No.: 628 / KHA