East Cambridgeshire District Council Water Cycle Study Detailed ...

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3.2.2 Results Discussion WwTW Soham This previous section has identified constraints from modelling as follows: Stage 2 Water Cycle Study: Final Report Sept 2011 32 Cambridgeshire Horizons East Cambridgeshire – Detailed WCS • Soham, Haddenham, Witchford, Littleport, Little Downham and Witcham WwTW will exceed their flow consent; however, water quality modelling has shown that a solution is possible within the limits of conventional treatment. Implementation of the solution may require new treatment processes and may have an impact on phasing of development; • Burwell and Bottisham WwTW will exceed their flow consent and water quality modelling has shown that to prevent a deterioration in downstream water quality, a solution beyond the limits of conventional treatment would be required. This section discusses solutions at Soham, Haddenham, Witchford, Littleport, Little Downham, Burwell and Bottisham WwTW. All other WwTW in the study area will not exceed their flow consent and do not need a solution before growth can proceed and hence are not discussed further in this WCS report. Upgrade Requirements For the WwTWs where a solution is theoretically available within limits of conventional treatment (for no deterioration), an assessment of the likely process capacity at each WwTW was undertaken by URS Scott Wilson to determine the impact of timing of upgrades on the early phasing of development sites in East Cambridgeshire. The assessment process included: • a qualitative assessment of process capacity by consideration of whether the change in consent condition for either BOD, ammoniacal-N or phosphorus was significant in relation to the existing consent condition, and if the change was small, whether the change was likely to be achievable with current treatment processes; • using satellite imagery, whether there is potential for suitable additional land available at the WwTW site to expand for the inclusion of new treatment process streams; and • where upstream flow data is available 19 , an assessment of the impact of the additional discharge on flood flows to determine if the impact of growth it is likely to cause an increase in flood risk in the receiving watercourse. The results of the assessment of process capacity and land availability are summarised in Table 3-5 below. Table 3-5: Results summary of treatment process capacity at WwTW requiring an increase in flow consent and change in quality parameters to ensure no downstream deterioration Consent parameter 19 For Burwell, Bottisham and Soham WwTWs Current consent standards Consent limits required for no deterioration Process assessment - Upgrade required? BOD 17A 12 Yes NH4 8 >Current No Is there space to expand WwTW Yes, if adjacent land is available
WwTW Haddenham Witchford Littleport Little Downham Witcham Consent parameter Stage 2 Water Cycle Study: Final Report Sept 2011 Current consent standards Consent limits required for no deterioration consent P 2 20 1 BOD 20A 19 NH4 5 4 P - No change required BOD 20A 18 NH4 12 11 P - No change required 33 Process assessment - Upgrade required? It is likely that the change to the consent could be accommodated within the existing process capacity of the WwTW It is likely that the change to the consent could be accommodated within the existing process capacity of the WwTW No It is likely that the change to the consent could be accommodated within the existing process capacity of the WwTW It is likely that the change to the consent could be accommodated within the existing process capacity of the WwTW BOD 15A 12 Yes It is likely that the change to the consent NH4 5 4 could be accommodated within the existing process capacity of the WwTW P - 1.7 Yes BOD 15A 14 It is likely that the change to the consent could be NH4 10 9 accommodated within the existing process capacity of the WwTW P - No change required No BOD 12A 11 It is likely that the change to the consent could be NH4 6 5 accommodated within the existing process capacity of the WwTW No Cambridgeshire Horizons East Cambridgeshire – Detailed WCS Is there space to expand WwTW Yes, if adjacent land is available Yes, if adjacent land is available Yes, if adjacent land is available Yes, if adjacent land is available Yes, if adjacent land is available 20 Soham WwTWs has a PE greater than 10,000 and discharges to a ‘Sensitive Areas (Eutrophic)’ as designated under the UWWTD, it is therefore required that either: a) the effluent achieves 2 mg/l of P as an annual average; or b) 80% of influent P is removed by the treatment process. Although the WwTW does not have a formal P consent value, it has been assumed for calculation purposes that a 2mg/l consent standard applies.
Page 1 and 2: East Cambridgeshire District Counci
Page 3 and 4: Table of Contents Cambridgeshire Ho
Page 5 and 6: Executive Summary Stage 2 Water Cyc
Page 7 and 8: Stage 2 Water Cycle Study: Final Re
Page 9 and 10: Surface Water Drainage Management S
Page 11 and 12: SWM5 - Linkages to SWMP and SFRA St
Page 13 and 14: Glossary of Acronyms and Abbreviati
Page 15 and 16: Abbreviation Description RTPI Royal
Page 17 and 18: 1.3 Stage 2 - Study Governance Stag
Page 21 and 22: • Surface Water Management Plan f
Page 23 and 24: 2 Proposed Growth 2.1 Preferred Gro
Page 25 and 26: 2.3 Employment Stage 2 Water Cycle
Page 27 and 28: Figure 2-1: Potential development s
Page 29 and 30: Relevant WwTW Stage 2 Water Cycle S
Page 33 and 34: WwTW Soham Burwell Bottisham Hadden
Page 38 and 39: WwTW Consent parameter Stage 2 Wate
Page 46 and 47: Table 3-7: Potential Impact of Clim
Page 48 and 49: 3.3 Ecological Appraisal Stage 2 Wa
Page 60 and 61: 3.4.1 Stage 2 network assessment re
Page 62 and 63: Site Description of potential waste
Page 64 and 65: Site Description of potential waste
Page 66 and 67: Bottisham Site Assessment Site Desc
Page 70 and 71: Impact on Supplies Stage 2 Water Cy
Page 76 and 77: Low flow taps and showers Stage 2 W
Page 80 and 81: Figure 4-1: A typical domestic rain
Page 84 and 85: Medium Scenario The key assumptions
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Table 4-7: Details of new Build Spe
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WN Scenario New development Water u
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Operation of GWR £30 per annum 82
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Table 4-12: Estimated Cost of Neutr
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Figure 4-3: CO2 emissions from a
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Stage 2 Water Cycle Study: Final Re
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4.4.7 Preferred strategy - delivery
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5 Surface Water Management 5.1 The
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• continuous surfaces with an inh
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5.5.1 Ecological opportunities Ely
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Site Stage 2 Water Cycle Study: Fin
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5.5.7 SuDS and groundwater protecti
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Lisle Lane, Ely 2.855 2.28 1,038 -
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Land rear of Fordham Road, Soham 2.
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6.3.3 Wastewater Network constraint
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6.4.4 Phasing Assessment Phase Dwel
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7.2 Climate Change and the Water Cy
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Directive/Legislation/Guidance Desc
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Key Additional development can be a
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Consents to achieve ‘Good Status
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MASS BALANCE CALCULATION: MONTE CAR
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LITTLEPORT STW Current Quality Cons
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HADDENHAM STW Current Quality Conse
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Sequencing Batch Reactor Stage 2 Wa
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Tertiary treatment Stage 2 Water Cy
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East Cambridgeshire WCS Flood Estim
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11 12 12 Is the discharged water on
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37 38 40 41 42 A) Have you provided
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