Trondheim June 2010
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Trondheim June 2010

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Trondheim June 2010 Trondheim June 2010 Presentation Transcript

  • Peter Hillis, Water Treatment Technical Expert, UU Engineering Upgrading the longest running microfiltration plant in the UK
  • Outline Background and History Drivers for Change Pilot Trials Comparison Pilot vs. Full-Scale Outcome 1
  • 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
  • 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
  • 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 (1.25%) Six monthly Peroxide clean Sulphuric acid clean as required (pH2) Zero Discharge Site – no sewer or discharge to the Lake 7
  • 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
  • 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
  • Historic Performance TMP and Flow 10
  • Historic Performance Membrane Resistance 11
  • 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
  • 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
  • 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
  • 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 volumes to thickener – estimated at 25% the volume with 4 times solids loading improving operation of thickener 18
  • One Step Beyond? 19
  • Copy of Presentation Email Peter.Hillis@uuplc.co.uk Download at LinkedIn.com 20
  • Thank You 21