Presentation Title

Monitoring Diurnal Variability of Organic Matter in Anaerobic DEWATS with an Emphasis on FOG, Scum Accumulation, and Scum Removal

Faculty Mentor

Natalie Mladenov, Monica Palomo, Chris Buckley, Bjoern Pietruschka

Start Date

18-11-2017 12:30 PM

End Date

18-11-2017 1:30 PM

Location

BSC-Ursa Minor 106

Session

Poster 2

Type of Presentation

Poster

Subject Area

engineering_computer_science

Abstract

The Anaerobic Baffled Reactor (ABR) is a type of decentralized wastewater treatment system (DEWATS) that yields water suitable for nonpotable purposes. The ABR has many benefits and is thought to be relatively low-maintenance, but issues can arise when wastewater influent exhibits high diurnal variability of organic matter (OM) and high concentrations of fats, oils, and greases (FOG) which engender scum accumulation. The experiments conducted for this study (post scum removal and diurnal variability) investigated the impact that FOG and scum accumulation have on OM biodegradation, and the trends in daily variability with respect to FOG, scum accumulation, and scum removal. The experiments were performed at a site treating domestic wastewater from a community in Durban, South Africa. Performance was determined with temporal in-situ fluorescence measurements of tryptophan-like (TRP) and fulvic acid-like (CDOM) compounds using the C3 Submersible Fluorometer, and with chemical oxygen demand (COD) concentrations. This study found that the variability of OM was exacerbated by high FOG concentrations as well as scum accumulation and removal. COD measurements and fluorescence measurements often correlated, but greatly varied by chamber and with respect to scum accumulation and removal. If scum accumulation and removal are not managed properly, the ABR will not biodegrade OM as efficiently. In worst-case scenarios, scum accumulation becomes so excessive that scum escapes the settling chambers and infiltrates the ABR chambers, further affecting OM biodegradation. Appropriate and individualized operation and maintenance strategies should be implemented for DEWATS to monitor OM and FOG concentrations as well as scum accumulation.

Keywords: Anaerobic Baffled Reactor (ABR), Scum, Fats, Oils, and Greases (FOG), Diurnal Variability, Chemical Oxygen Demand (COD), Tryptophan (TRP), Chromophoric Dissolved Organic Matter (CDOM)

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Nov 18th, 12:30 PM Nov 18th, 1:30 PM

Monitoring Diurnal Variability of Organic Matter in Anaerobic DEWATS with an Emphasis on FOG, Scum Accumulation, and Scum Removal

BSC-Ursa Minor 106

The Anaerobic Baffled Reactor (ABR) is a type of decentralized wastewater treatment system (DEWATS) that yields water suitable for nonpotable purposes. The ABR has many benefits and is thought to be relatively low-maintenance, but issues can arise when wastewater influent exhibits high diurnal variability of organic matter (OM) and high concentrations of fats, oils, and greases (FOG) which engender scum accumulation. The experiments conducted for this study (post scum removal and diurnal variability) investigated the impact that FOG and scum accumulation have on OM biodegradation, and the trends in daily variability with respect to FOG, scum accumulation, and scum removal. The experiments were performed at a site treating domestic wastewater from a community in Durban, South Africa. Performance was determined with temporal in-situ fluorescence measurements of tryptophan-like (TRP) and fulvic acid-like (CDOM) compounds using the C3 Submersible Fluorometer, and with chemical oxygen demand (COD) concentrations. This study found that the variability of OM was exacerbated by high FOG concentrations as well as scum accumulation and removal. COD measurements and fluorescence measurements often correlated, but greatly varied by chamber and with respect to scum accumulation and removal. If scum accumulation and removal are not managed properly, the ABR will not biodegrade OM as efficiently. In worst-case scenarios, scum accumulation becomes so excessive that scum escapes the settling chambers and infiltrates the ABR chambers, further affecting OM biodegradation. Appropriate and individualized operation and maintenance strategies should be implemented for DEWATS to monitor OM and FOG concentrations as well as scum accumulation.

Keywords: Anaerobic Baffled Reactor (ABR), Scum, Fats, Oils, and Greases (FOG), Diurnal Variability, Chemical Oxygen Demand (COD), Tryptophan (TRP), Chromophoric Dissolved Organic Matter (CDOM)