Process emissions

PROCESS
EMISSIONS

LET’S GET STARTED
WHERE ARE WE NOW?

Scottish Water treats 983ML* of wastewater per day.

Our biological treatment processes generate nitrous oxide (N2O) and methane (CH4). Both are greenhouse gases.

This is the equivalent of 43kt CO2e pa.

*1 ML (megalitre) = 1 million litres

Remaining emissions chart

2019/20 POSITION

983ML

PER DAY

WASTEWATER
TREATED

43kt CO2e

PER ANNUM

NITROUS OXIDE AND
METHANE PRODUCED

2019/20 POSITION

983ML

PER DAY

WASTEWATER
TREATED

43kt CO2e

PER ANNUM

NITROUS OXIDE AND METHANE PRODUCED

TOP 3 CONTRIBUTORS FOR PROCESS EMISSIONS
NITROUS OXIDE
34%

WASTEWATER
AERATION

NITROUS OXIDE
22%

WASTEWATER
SLUDGE TREATMENT

METHANE
20%

WASTEWATER
SLUDGE STORAGE

TOP 3 CONTRIBUTORS FOR PROCESS EMISSIONS
NITROUS OXIDE
34%

WASTEWATER
AERATION

NITROUS OXIDE
22%

WASTEWATER
SLUDGE TREATMENT

METHANE
20%

WASTEWATER
SLUDGE STORAGE

OUR APPROACH

REDUCE
EMISSION PRODUCTION

MAXIMISE ENERGY
RECOVERED FROM BIORESOURCE

These tables illustrate the key activities we are
exploring to reduce our process emissions.

We will keep these under review
with our expert advisory panel.

Reducing our production of process emissions

UP TO

2025

• Identify and implement more accurate measurement and accounting for process emissions.

UP TO

2030

UP TO

2040

• Demonstrate optimisation of WWTWs and Sludge Treatment Centres to decrease production of N2O.

• Implement optimisation of WWTWs and Sludge Treatment Centres to decrease production of N2O.

• Complete optimisation of WWTWs and Sludge Treatment Centres to decrease production of N2O.

• Identify, assess and demonstrate sludge storage and transport optimisation to decrease methane emissions.

• Implement sludge storage and transport optimisation to decrease methane emissions.

• Complete sludge storage and transport optimisation to decrease methane emissions.

• Technology scouting for innovative technology to reduce process emissions.

Reducing our production of process emissions

UP TO

2025

• Identify and implement more accurate measurement and accounting for process emissions.

• Demonstrate optimisation of WWTWs and Sludge Treatment Centres to decrease production of N2O.

• Identify, assess and demonstrate sludge storage and transport optimisation to decrease methane emissions.

• Technology scouting for innovative technology to reduce process emissions.

UP TO

2030

• Implement optimisation of WWTWs and Sludge Treatment Centres to decrease production of N2O.

• Implement sludge storage and transport optimisation to decrease methane emissions.

UP TO

2040

• Complete optimisation of WWTWs and Sludge Treatment Centres to decrease production of N2O.

• Complete sludge storage and transport optimisation to decrease methane emissions.

INNOVATION
CHALLENGES

DEVELOP RECOVERY OF
AMMONIA FROM WASTEWATER
AVOIDING PROCESS EMISSIONS

DEVELOP METHANE
CAPTURE TECHNOLOGY,
AVOIDING PROCESS EMISSIONS

IDENTIFY CIRCULAR ECONOMY
OPPORTUNITIES FOR USE OF
RECOVERED AMMONIA

INNOVATION CHALLENGES

DEVELOP RECOVERY OF
AMMONIA FROM WASTEWATER

DEVELOP METHANE
CAPTURE TECHNOLOGY,
AVOIDING PROCESS EMISSIONS

IDENTIFY CIRCULAR ECONOMY
OPPERTUNITIES FOR USE OF
RECOVERED AMMONIA

INNOVATION CHALLENGES

DEVELOP RECOVERY OF
AMMONIA FROM WASTEWATER

DEVELOP METHANE
CAPTURE TECHNOLOGY,
AVOIDING PROCESS EMISSIONS

IDENTIFY CIRCULAR ECONOMY OPPORTUNITIES FOR USE OF RECOVERED AMMONIA

KEY ENABLERS TO SUPPORT
REDUCING PROCESS EMISSIONS

PEOPLE CAPABILITY

Expand our process
science skills

TECHNOLOGY

Developing improved process
monitoring equipment

MARKETS

Develop a quality product
for the circular economy

KEY ENABLERS TO
SUPPORT REDUCING PROCESS EMISSIONS

PEOPLE CAPABILITY

Expand our process
science skills

TECHNOLOGY

Developing improved process
monitoring equipment

MARKETS

Develop a quality product
for the circular economy

EXTERNAL FACTORS THAT SUPPORT
REDUCING PROCESS EMISSIONS

INCENTIVES

to stimulate technology
development for
energy recovery

INTERNATIONAL REVIEWS OF GREENHOUSE GAS
EMISSIONS FACTORS

for methane and
nitrous oxide

REGULATORY FRAMEWORK

developed for how we
measure process emissions

EXTERNAL FACTORS THAT SUPPORT  REDUCING PROCESS EMISSIONS

INCENTIVES

to stimulate technology
development for
energy recovery

INTERNATIONAL REVIEWS OF GREENHOUSE GAS
EMISSIONS FACTORS

for methane and
nitrous oxide

REGULATORY FRAMEWORK

developed for how we
measure process emissions

INTRODUCTION

TRANSFORMATION

REDUCING
EMISSIONS
SUPPORTING A
FLOURISHING SCOTLAND

ELECTRICITY

PROCESS
EMISSIONS

GAS &
FUEL OIL

TRANSPORT
& TRAVEL

INVESTMENT

STORING
CARBON