Reducing the Greenhouse Gas Emissions of Water and Sanitation Services:

This report approaches the question from the angle of energy use in the water sector rather than the better-known water requirements for the energy sector. The report also aims to provide an overview of possible levers to reduce the greenhouse gas emissions of water and sanitation services and provides an analysis of how adaptation measures can embrace this low-carbon approach.

Anglian Water 2030 strategy

For many years we have been at the forefront of carbon reduction in the water industry. With a committed leadership and a determined supply chain, by 2020 we had reduced capital carbon by 61 per cent in our capital programmes from our original 2010 baseline and reduced operational emissions by 34 per cent from a new baseline set in 2014/2015. We are also supporting system-wide decarbonisation in the region, for example by exporting waste heat to warm tomato greenhouses in our region year-round – something we are looking to repeat at other sites

Full-Scale Evaluation of Conventional Activated Sludge and MABR N2O emissions

Nitrous oxide (N2O) is a greenhouse gas with a global warming potential 265 times stronger than carbon dioxide on a 100-year time horizon (Eickemeier et al., 2014) and therefore, even emitted in small amounts, it can contribute significantly to global warming. In addition, nitrous
oxide is acknowledged as an important threat to the ozone layer (Ravishankara et al., 2009). N2O is an undesired bioproduct emitted during the biological nitrogen removal process in wastewater treatment systems and despite the recent efforts in understanding nitrous oxide
emissions from wastewater treatment, data from full-scale plants is still scarce.

Greenhouse Nitrogen Emissions from Wastewater Treatment Operation: Phase I: MOLECULAR LEVEL THROUGH WHOLE REACTOR LEVEL CHARACTERIZATION

Engineered biological nutrient removal (BNR) processes have been identified by the Intergovernmental Panel on Climate Change (IPCC) as potential contributors to atmospheric nitrous oxide (N2O) emissions. This is a significant concern to wastewater utilities because the greenhouse impact of nitrous oxide emissions on a mass equivalent basis is 300 times that of carbon dioxide. This study differs from other studies in that it characterizes the microbial pathways for N2O formation in addition to measurement of emission rates from several BNR and non-BNR plants across the U.S. As the production and emission pathways are understood, operational strategies to minimize N2O emissions appear highly likely.

Greenhouse gas emissions from membrane bioreactors: analysis of a two-year survey on different MBR configurations

This study aimed at evaluating the nitrous oxide (N2O) emissions from membrane bioreactors (MBRs) for wastewater treatment. The study investigated the N2O emissions considering multiple influential factors over a two-year period: (i) different MBR based process configurations; (ii) wastewater composition (municipal or industrial); (iii) operational conditions (i.e. sludge retention time, carbon-to-nitrogen ratio, C/N, hydraulic retention time); (iv) membrane modules. Among the overall analysed configurations, the highest N2O emission occurred from the aerated reactors. The treatment of industrial wastewater, contaminated with salt and hydrocarbons, provided the highest N2O emission factor (EF): 16% of the influent nitrogen for the denitrification/nitrification-MBR plant. The lowest N2O emission (EF = 0.5% of the influent nitrogen) was obtained in the biological phosphorus removal-moving bed-MBR plant likely due to an improvement in biological performances exerted by the co-presence of both suspended and attached biomass. The influent C/N ratio has been identified as a key factor affecting the N2O production. Indeed, a decrease of the C/N ratio (from 10 to 2) promoted the increase of N2O emissions in both gaseous and dissolved phases, mainly related to a decreased efficiency of the denitrification processes

Assess your utility’s carbon footprint
X Close

Assess your utility’s energy performance and GHG emissions

Assess my system