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DST Newsroom

Dr. Bani Hashemi has Paper Accepted for Publication in WER

16 th Jun 2017

It is our pleasure to announce that DST Project Manager Dr. Bani Hashemi has had his manuscript “General Fate Model for Microconstituents in an Activated Sludge System” selected for publication in Water Environment Research (WER).

Having his paper selected for publication in WER, a well-respected, peer reviewed journal, recognizes Dr. Bani Hashemi for his outstanding contributions to wastewater treatment research.

He first presented the paper to delegates at the international 2016 WEFTEC Conference held last summer in New Orleans where it received special recognition and was nominated for publication.

WEFTEC is the world’s largest water quality conference and the 2016 event had over 20,000 registrants and 1000 exhibitors, making it one of the best attended in the event’s history.  It was a privilege to have been selected to present to wastewater treatment experts from around the world at such a prestigious event.  But, to have his manuscript accepted by the WER Board of Editorial Review for publication is a great honour.  The manuscript will be published in print and online.

Congratulations to Dr. Bani Hashemi on this significant accomplishment and for continuing to be a leader in the wastewater treatment field.

Abstract:  General Fate Model for Microconstituents in an Activated Sludge System

Nine lab-scale continuous flow porous-pot bioreactors operating at various solids retention times and hydraulic retention times were conducted to simulate activated sludge (AS) systems and to evaluate the biodegradation kinetic models for the fate of 17α-ethinylestradiol (EE2), bisphenol-A (BPA), and triclosan (TCS) at the µg/L range. Mathematical models were applied to describe the degradation mechanism of selected microconstituents (MCs) and pseudo second-order model were found to best fit the results when active MCs degraders (XC) were used (r2= 0.99). The result of XC estimation showed that SRT plays an important role in formation of the biomass capable of degrading selected MCs. It is also observed that the MCs degraders are naturally present in the AS system even at low SRTs; however, the concentration of XC is dependent to SRT. It is found that biodegradation studies should incorporate XC and not mixed liquor suspended solids concentration (MLSS) in their kinetic formulations.


About DST Consulting Engineers

DST is a nation-wide, employee owned company with over 40 years of experience. Our ‘product’ is our knowledge, our greatest asset is our brain power, and our business is providing a range of comprehensive, results-driven services to meet the special demands of our clients.


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