Peter Hillis, Water Treatment Technical Expert, UU
Engineering

Upgrading the longest
running microfiltration plant
in the...
Outline



  Background and History
  Drivers for Change
  Pilot Trials
  Comparison Pilot vs. Full-Scale
  Outcome




  ...
Background and History



                         Lake District, NW England
                         59 Ml/d (15 MGD)
   ...
Current Process Flow Diagram
                    Primary
                    Microfiltration
                             ...
Intake at Ennerdale Lake




                           4
Ennerdale WTW




                5
Ennerdale WTW




                6
Primary Membrane Operation



  Backwash Interval – 60 minutes
  Backwash Duration – 2.5 minutes
  Monthly caustic clean (...
Secondary Membrane Operation



  Feed to secondary units is blend of
  • primary backwash water (20 mg/l )

  • clarifier...
Drivers for Change



  Plant has operated successfully for over 10 years
  Membrane life of PP >10 Years
  Why change fro...
Historic Performance TMP and Flow




                                    10
Historic Performance Membrane Resistance




                                           11
Feed water quality 2000 to 2009




                                                       Manganese   Aluminium
         ...
Pilot Trials – Main Plant Comparison



  Pilot Plant                      Main Plant
  PVdF Membrane                    P...
Pilot Plant Results



Run #    Start    Days               TMP                       Resistance          Flux          BW...
Pilot Plant Results




                      15
Pilot Plant Results




                      16
Comparison with Full-scale




                             17
Identified Benefits



  Reduced energy
  Reduced chemical consumption
  Simplified CIP – Hypochlorite only
  Reduced volu...
One Step Beyond?




                   19
Copy of Presentation



  Email Peter.Hillis@uuplc.co.uk


  Download at LinkedIn.com




                                ...
Thank You




            21
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Trondheim June 2010

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Trondheim June 2010

  1. 1. Peter Hillis, Water Treatment Technical Expert, UU Engineering Upgrading the longest running microfiltration plant in the UK
  2. 2. Outline Background and History Drivers for Change Pilot Trials Comparison Pilot vs. Full-Scale Outcome 1
  3. 3. Background and History Lake District, NW England 59 Ml/d (15 MGD) Cryptosporidium Commissioned in late 1999 Longest running MF plant in UK This is a single source supply – no alternatives 2
  4. 4. Current Process Flow Diagram Primary Microfiltration 59 Ml/d Pre-screen Contact Tank 17 x 90M10C 2 x 90M10C Clarifier Secondary Microfiltration PACl Tanker 3 2% Sludge
  5. 5. Intake at Ennerdale Lake 4
  6. 6. Ennerdale WTW 5
  7. 7. Ennerdale WTW 6
  8. 8. Primary Membrane Operation Backwash Interval – 60 minutes Backwash Duration – 2.5 minutes Monthly caustic clean (1.25%) Six monthly Peroxide clean Sulphuric acid clean as required (pH2) Zero Discharge Site – no sewer or discharge to the Lake 7
  9. 9. Secondary Membrane Operation Feed to secondary units is blend of • primary backwash water (20 mg/l ) • clarifier decant (5 - 25 NTU) Clarifier is fed from blend of • secondary backwash water (100 - 200 mg/l) • neutralized CIP solution Lake water low in dissolved solids (50 S/cm) • coagulation sensitive to neutral CIP waste Clarifier sludge 2%, 18 m³/day • most difficult area, problems can shut plant 8
  10. 10. Drivers for Change Plant has operated successfully for over 10 years Membrane life of PP >10 Years Why change from something that works well? Improved efficiency – power, chemicals, waste Improved flexibility – operation Improved waste treatment 9
  11. 11. Historic Performance TMP and Flow 10
  12. 12. Historic Performance Membrane Resistance 11
  13. 13. Feed water quality 2000 to 2009 Manganese Aluminium TOC (mg/l) Turbidity (NTU) Iron (ug/l) (ug/l) (ug/l) Average 1.09 0.68 26.61 6.67 38.57 Max 4.22 3.99 166 39 245 Min 0.25 0.12 5 2 14.24 Std Dev 0.48 0.48 18.25 5.26 22.89 No 241 171 171 191 171 12
  14. 14. Pilot Trials – Main Plant Comparison Pilot Plant Main Plant PVdF Membrane PP Membrane Siemens Memcor L10V Siemens Memcor M10C 23m2 membrane area per module 28m2 membrane area per module Flux 73 lmh Design Flux 41 lmh Backwash Interval – 60 minutes Backwash Interval – 60 minutes Backwash Volume – 17 l/module Backwash Volume – 55 l/module Backwash Duration – 2.5 mins Backwash Duration – 1.5 mins 13
  15. 15. Pilot Plant Results Run # Start Days TMP Resistance Flux BW Interval (Minutes) Date (kPa) ( lm-2h-1 ) Run Start Run End Run Run Start End 1 21/9/06 34 30 114 1.80 5.73 73 60 2 2/10/06 42 30 137 1.25 4.92 73 60 3 6/12/06 39 33 149 1.23 5.23 73 60 4 16/1/07 30 34 103 1.23 3.43 73 60 5 20/2/07 35 30 58 1.21 2.65 56 60 6 27/3/07 66 27 97 1.24 5.28 56 60 7 1/6/07 34 27 60 1.46 3.35 56 60 8 5/7/07 43 24 110 1.53 6.40 56 120 9 10/9/07 47 24 110 1.40 5.00 56 120 14
  16. 16. Pilot Plant Results 15
  17. 17. Pilot Plant Results 16
  18. 18. Comparison with Full-scale 17
  19. 19. Identified Benefits Reduced energy Reduced chemical consumption Simplified CIP – Hypochlorite only Reduced volumes to thickener – estimated at 25% the volume with 4 times solids loading improving operation of thickener 18
  20. 20. One Step Beyond? 19
  21. 21. Copy of Presentation Email Peter.Hillis@uuplc.co.uk Download at LinkedIn.com 20
  22. 22. Thank You 21

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