Riser Pipe and Port Design for the Toronto Ashbridges Bay Treatment Plant Outfall

Waher, Kevin; Henderson, Graeme D; Gammie, Colleen; Kempa-Teper, Justyna; Petran, Vlad

doi:10.1061/9780784481646.009

“…This optimal ratio is influenced by the specific makeup of the sludge, which will differ between WWTPs. Unlike the above mentioned Beenyup WTP, the Ashbridges Bay plant (ABTP) in Toronto, had previously identified a sludge target ratio of 33% to 67% TWAS to PS with 15 days HRT (Toronto Water, 2021). This ratio is believed to be the favorable ratio to accommodate TWAS processing and digester gas production within the ABTP.…”

Section: List Of Tablesmentioning

confidence: 99%

Co-Digestion of Primary Sludge and Waste Activated Sludge for Methane Production

Mahdi

2024

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The ratio of primary sludge (PS) and thickened waste activated sludge (TWAS) is a vital factor in the production of digester gas in the wastewater plants. Many wastewater plants do not track sludge ratio, but instead, use a specific monthly or annual sludge ratio that is calculated as an average for their processed PS and TWAS. Lab scale batch biochemical methane potential (BMP) and semi-continuous experiments were used to study different PS and TWAS ratios in a municipal wastewater treatment plant. The batch BMP study showed that the mixing ratio 67% to 33% (PS:TWAS) was the optimum ratio for the highest digester gas yield of 209 mL CH 4g TCOD. The semi-continuous study showed that the ratio 72% to 28% (PS:TWAS) at 15 days hydraulic retention time was better than the ratio 67% to 33% (PS:TWAS) in producing higher yield (188 mL CH /g4TCOD compared to 163 mL CH /g TCOD4 respectively).

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“…This optimal ratio is influenced by the specific makeup of the sludge, which will differ between WWTPs. Unlike the above mentioned Beenyup WTP, the Ashbridges Bay plant (ABTP) in Toronto, had previously identified a sludge target ratio of 33% to 67% TWAS to PS with 15 days HRT (Toronto Water, 2021). This ratio is believed to be the favorable ratio to accommodate TWAS processing and digester gas production within the ABTP.…”

Section: List Of Tablesmentioning

confidence: 99%

Co-Digestion of Primary Sludge and Waste Activated Sludge for Methane Production

Mahdi

2024

Preprint

0

View full text Add to dashboard Cite

The ratio of primary sludge (PS) and thickened waste activated sludge (TWAS) is a vital factor in the production of digester gas in the wastewater plants. Many wastewater plants do not track sludge ratio, but instead, use a specific monthly or annual sludge ratio that is calculated as an average for their processed PS and TWAS. Lab scale batch biochemical methane potential (BMP) and semi-continuous experiments were used to study different PS and TWAS ratios in a municipal wastewater treatment plant. The batch BMP study showed that the mixing ratio 67% to 33% (PS:TWAS) was the optimum ratio for the highest digester gas yield of 209 mL CH 4g TCOD. The semi-continuous study showed that the ratio 72% to 28% (PS:TWAS) at 15 days hydraulic retention time was better than the ratio 67% to 33% (PS:TWAS) in producing higher yield (188 mL CH /g4TCOD compared to 163 mL CH /g TCOD4 respectively).

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“…The event resulted in 13 vehicles being stranded in water over 1 m deep (Davies, 2018). Despite the 9 years of green roof development that preceded this event, it still led to a CSO, with Toronto Water reporting a 127,350 m 3 bypass event at Ashbridges Bay correlating to the storm (Toronto Water, 2019). The costs of this flood were ultimately miniscule in comparison to Toronto's costliest rain event which occurred on July 8th, 2013.…”

Section: Introductionmentioning

confidence: 99%

Evapotranspiration Rates of Representative Green Roof Systems and the Implications for Green Roof Policies

Wright

2024

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Urban intensification, population growth and climate change are creating multiple issues within cities on a global scale. As more buildings are constructed to support increasing urban populations, cities are having a more difficult time managing sporadic weather events; especially managing stormwater from intense rainfall. Toronto currently has in place a mandatory green roof bylaw, that is designed to utilize shallow green roofs (GRs) on all new buildings as a measure to intercept rainfall and transpire the water back into the atmosphere. Four green roof modules with varying system buildups were constructed and instrumented on top of a downtown building to analyze how the amounts of retained rainfall and evapotranspiration varied amongst the systems. It was determined that the total evapotranspiration (ET) volume of blue/green roofs and vegetable producing green roofs were considerably higher than a traditional extensive green roof; 236% higher in the blue/green roof and 356% higher in the vegetable roof. It was also determined that unvegetated blue roof systems are also a viable method of managing stormwater on rooftops, with the blue roof module showcasing a total evaporation volume of 134 mm over the duration of the study. The results from this research exhibit that higher hydrological benefit can be derived from green roofs using blue-green technology or vegetable producing assemblies.

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Riser Pipe and Port Design for the Toronto Ashbridges Bay Treatment Plant Outfall

Cited by 4 publications

References 1 publication

Co-Digestion of Primary Sludge and Waste Activated Sludge for Methane Production

Co-Digestion of Primary Sludge and Waste Activated Sludge for Methane Production

Co-Digestion of Primary Sludge and Waste Activated Sludge for Methane Production

Evapotranspiration Rates of Representative Green Roof Systems and the Implications for Green Roof Policies

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