Conference Agenda

Overview and details of the sessions of this conference. Please select a date or location to show only sessions at that day or location. Please select a single session for detailed view (with abstracts and downloads if available).

Session Overview
Plenary 11: In-Sewer Processes 2 - H2S
Thursday, 25/Aug/2022:
3:30pm - 4:40pm

Session Chair: Roni Penn
Location: Lecture Hall BMT

BMTEG138 (HS BMT), Biomedical Engineering Building at Stremayrgasse 16, 8010 Graz, ground floor

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3:30pm - 3:50pm

H2S control through an original channel

Gislain Lipeme, Gaëlle Ducom, Françoise Jolly, Pierre Buffiere

UNIV LYON, INSA LYON, DEEP, 69621 Villeurbanne, France

Hydrogen sulphide (H2S) is one of the most common gases encountered in gravity sewers. It causes odour nuisance and is also dangerous for humans. It can have serious consequences on the health of sewage workers. In this paper a nature-based solution favouring the release of H2S and its filtration in an original channel is proposed and is evaluated through CFD modelling approach.The proposed channel operates in a proper way. The hydraulic jump increases the turbulent kinetic energy leading to the massive release of H2S. Then natural ventilation directs the air to the filter.

3:50pm - 4:10pm

Liquid H2S Online Measurement for Optimized Sewer System Insights and H2S Control

Marie INIZAN1, Tim ALIG2

1Hach, France; 2Hach, USA

In order to prevent corrosion in the collection system and prevent public complaints caused by nuisance odours, water utilities use chemicals to mitigate hydrogen sulfide (H2S). By dynamically adjusting the chemical dosing rate to match real-time liquid-phase H2S concentrations from an online sensor, the effectiveness of ferrous sulfate (FeSO4) dosing at the end-of-pipe improved while chemical consumption dropped by 50%.

4:10pm - 4:30pm

Continuous measurement of dissolved sulphide in sewers

Esther Vollertsen1, Yansi Jesuloganathan2, Bo Snediker Jacobsen2, Jes Vollertsen3

1EnviDan A/S; 2Aarhus Water A/S; 3Aalborg University, Denmark

The city of Aarhus, Denmark, with its 400,000 PE and its 1,632 km of sewers, experiences odour and corrosion problems. These have intensified over the last decades as wastewater treatment has been centralized, combined systems converted to separate ones, and water consumption has declined. In this presentation, a catchment-wide measuring campaign of pH and dissolved H2S gas (using SulfiLoggerTM) is presented, and benefits and issues related to the approach discussed. Finally, the applicability for calibrating a sewer process model, Mega-WATS, is touched on.

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