Abstract
The process of removing organic components from wastewater as BOD5 through wastewater treatment plants has been proven to be a significant source of greenhouse gas emissions, mainly methane CH4, carbon dioxide CO2 and nitrous oxide N2O. The reduction of these emissions has attracted more interest given their major contribution to global warming. This study was able to identify and estimate the amount of methane and CO2 emissions on a monthly basis by a simple modeling approach and an empirical method (IPCC) for N2O emissions, in the case of Ain-Taoujdate wastewater treatment plant, throughout the years 2013, 2018 and 2019. The results showed that anaerobic ponds were the main source of on-site emissions with 66% of total contribution and 33% for facultative ponds, followed by the energy consumption of the pumping station as off-site GHG emissions.
Highlights
Greenhouse gas emissions from anthropogenic sources such as use and production of fossil fuel, industrial and agricultural activities,[1] have been scientifically proven worldwide to be the main cause of global warming
Since the launch of the National Program of Sanitation and Wastewater treatment in 2006, Morocco has seen the creation of 140 wastewater treatment plants, which natural lagoon process is the most widely used at the national level, accounting for more than 82% of the Wastewater treatment plants (WWTP) carried out and 56% of the volume of treated wastewater
The simple modelling approach for direct and indirect estimation has demonstrated accurate results on each unit of the treatment plant, better than the methods proposed by the IPCC guidelines
Summary
Greenhouse gas emissions from anthropogenic sources such as use and production of fossil fuel, industrial and agricultural activities,[1] have been scientifically proven worldwide to be the main cause of global warming. Wastewater treatment plants (WWTP) have been recognized as a major source of greenhouse gases due to their on-site and off-site production of three main gases: carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O), with a global warming potential (GWP) of 1, 28 and 265 respectively (IPCC 2014). On-site emissions are source of different wastewater treatment procedures such as biological processes (CO2 emissions from aerobic microbiological respiration, N2O source of nitrification and denitrification, CH4 from anaerobic digestion). Off-site GhG emissions are from the energy consumption by different units of the station, in this case the power consumption of the WWTP and the pumping station. The city of AinTaoujdate has a natural lagoon-type wastewater treatment plant. consisting of pretreatment facilities (screen, sand trap), four anaerobic basins and two Facultative basins, drying beds and an operating building
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