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Estimation of greenhouse gas and odour emissions from a cold region municipal biological nutrient removal wastewater treatment plant

Journal of Environmental Management, ISSN: 0301-4797, Vol: 281, Page: 111864
2021
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Metric Options:   Counts1 Year3 Year

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Article Description

Seasonal temperature variations in cold regions worldwide lead to variable gas emissions from municipal wastewater treatment plants (MWTPs) due to changing wastewater temperatures in open-to-air treatment processes. The objective of this study was to determine the greenhouse gas (including carbon dioxide, CO 2 ; methane, CH 4 ; and nitrous oxide, N 2 O) and odour (including ammonia, NH 3 ; and hydrogen sulphide, H 2 S) emission rate estimates (EREs) from the open-to-air processes of a biological nutrient removal (BNR) type MWTP in Saskatoon, SK, Canada. This MWTP experiences seasonal temperatures from −40 °C to 30 °C with the resultant wastewater temperatures considered herein of 13 °C and 17 °C being chosen based on monitoring data for winter and summer, respectively. Laboratory-scale reactors simulating anaerobic, anoxic, aerobic, and settling treatment processes were used to monitor gas EREs using wastewater samples taken from the analogous MWTP processes during the winter and summer seasons. Results indicated that the overall winter EREs for CO 2, CH 4, and N 2 O were 45,129 kg CO 2 /d, 21.9 kg CH 4 /d, and 3.20 kg N 2 O/d, respectively, while the H 2 S EREs were insignificant. The higher temperature for the summer samples resulted in increased EREs for CH 4, N 2 O, and H 2 S EREs of 33.0 kg CH 4 /d, 3.87 kg N 2 O/d, and 2.29 kg H 2 S/d, respectively. However, the CO 2 EREs were reduced to 37,794 kg CO 2 /d. Overall, the aerobic reactor was the dominant source of the GHG emissions for both seasons. In addition, studied changes in the aerobic reactor aeration rates (in reactor) and BNR treatment configurations (from site) further impacted the EREs.

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