Proceedings

Designing a process solution to a network issue

Robinson, D.1 and Sherwood, A.2, 1MWH, UK, 2United Utilities, UK PRESENTATION ONLY

(free)

Integrated Catchment Model (ICM)

• Integrates pollutant sources with receiving water.

• Includes – WwTW Point Sources – CSO Discharges – Urban storm run-off – Background River Flow and Quality

• Driven by rainfall

Question – Can enhancements to the treatment at the WwTW reduce or eliminate the need for network storage?

Rochdale ICM Solutions

• PR09 work was based on actual WwTW quality performance. At that time this was 95%ile 6.4 BOD and 2.1 Ammonia

• EA Asked us to re-model based on the WwTW achieving it’s 95%ile consent of 5 mg/l Ammonia

• Using the consented value we cannot achieve FIS un-ionised ammonia compliance

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