# Mogden Sewage Treatment Works

Thames Water October 2013

## Introduction

- Presentation will focus upon
- Background - Odour reduction investment & results
- Mogden STW quality improvements - Operational activities - Future work

## Mogden Background

- One of the largest sewage works in the UK - Built between 1931 and 1935 - Serves 1.9m people - Covers an area of 55 hectares
- Over half of the works is powered by renewable energy           
generated on site 
- Significant investment in the last 10 years

## Historic Odour Complaints Odour Reduction Investment Significant Investment Undertaken Between 2005 And 2010 What Was Involved?

- Odour covers, control and abatement to:
- East inlet screen house and west inlet area 
covered and odour controlled
- Covering of SSTs & conversion to PSTs - Covering of 2 first fill storm tanks - Installation OCUs on east and west side

## Odour Reduction Results

2008 independent odour assessment was carried out to review the success of the odour abatement investment : Assessment concluded that odour has reduced from the STW:
by 82% compared to 2005
by 90% compared to 2003. 

Annual odour assessment carried out each year during the autumn. 2013 odour assessment currently underway. Results known by November.

## Mogden Stw Upgrade: 2010 To 2013

- Completed in April 2013 - Extended treatment capacity by 50 per cent - Odour abatement of new inlet work and primary tanks
- Covering of the existing rectangular west side primary tanks - Significant reduction in use of storm tanks and discharges to 
the Thames
- Communications reaching 10,000 residents - Project value £140m

## Mogden Stw Upgrade 2010 - 2013 Mogden. Use Of Storm Tanks Graph. Operational Activities

•Odour monitors •Joint TW/LBH site inspections •Dedicated phone line 
•Residents meetings •Webpage

## Future

•Complete western embankment landscaping •Continue reviewing odour emissions and abatement •Working with the community •Appraising ways to capture more renewable energy
•'Bin it don't block it' campaign •Continue support for Sustainable Urban Drainage Schemes 

## How Mogden Works