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Kelani River Water Treatment Plant in Colombo

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Treatment plant capacity – 180,000 m3/day; Construction of Raw Water Intake pumping station (4 pumps with each pump capacity 737 l/s), Flocculation and Clarification Units (total V=12500m3), Gravity Filters (total V=7000m3), Contact/Clear Water Tanks (totalV=10000m3), Treated Water PS, Sludge treatment Units, Chemical, Chlorine and Administrative buildings. Total in-situ reinforced concrete quantity – 21000m3;

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Kelani River Water Treatment Plant in Colombo

  1. 1. KELANI RIGHT BANK WATER TREATMENT PLANT PROJECT <ul><li>CLIENT </li></ul><ul><li>NATIONAL WATER SUPPLY AND DRAINAGE BOARD </li></ul><ul><li>CONTRACTOR </li></ul><ul><li>AARSLEFF-SALCON JV </li></ul>NATIONAL WATER SUPPLY & DRAINAGE BOARD
  2. 2. KELANI RIGHT BANK WATER TREATMENT PLANT PROJECT <ul><li>MINISTRY OF WATER SUPPLY & DRAINAGE </li></ul><ul><li>NATIONAL WATER SUPPLY & DRAINAGE BOARD </li></ul><ul><ul><li>CONTRACTOR - AARSLEFF – SALCONJV </li></ul></ul><ul><ul><li>CONTRACT AMOUNT - 8100 MILLION SLR (57 MEUR) </li></ul></ul><ul><ul><li>DATE OF COMMENCEMENT - 22 nd OCT 2008 </li></ul></ul><ul><ul><li>CONTRACT PERIOD - 02 YEARS </li></ul></ul><ul><ul><li>TREATMENT PLANT CAPACITY - 40 MILLION GALLONS PER DAY (180,000 m3 PER DAY) </li></ul></ul><ul><li>Scope of Work: </li></ul><ul><ul><li>Design, construction and completion of all civil and structural component. </li></ul></ul><ul><ul><li>Design, manufacture, supply, installation, testing and commissioning of all M&E plant </li></ul></ul><ul><ul><li>Testing and commissioning of the Works. </li></ul></ul><ul><ul><li>Training of NWSDB personnel for the O&M of the W orks. </li></ul></ul><ul><ul><li>THE PROJECT WAS FUNDED BY THE GOVERNMENT OF DENMARK AND GOVERNMENT OF SRILANKA </li></ul></ul>NATIONAL WATER SUPPLY & DRAINAGE BOARD
  3. 3. The Project consist of three main Parts Raw water intake Water treatment Plant Staff Quarters
  4. 4. RAW WATER INTAKE SITE NATIONAL WATER SUPPLY & DRAINAGE BOARD <ul><li>Main function: </li></ul><ul><li>Coarse scree n s </li></ul><ul><li>Band scree n s </li></ul><ul><li>Pumping station with 4 pumps to be installed for Phase 1 (each pump capacity is 737 l/s) </li></ul>
  5. 5. Raw water intake <ul><li>Construction of cofferdam with protection by perimeter by 12 m sheet piles (400 pcs; aver. 360 N/mm2) </li></ul><ul><li>Sheet piles supported by 2-3 layers struts (305x305x158 kg/m ), wallers (356x406x467 kg/m ) and king posts (254x254x89 kg/m ) (H beams) </li></ul><ul><li>Deepest excavation up to 8,5 m from existing earth level….. </li></ul><ul><li>Works were going 7 days per week, unless….. </li></ul>
  6. 6. … .unless it was not raining to much…
  7. 7. WT P P LANT LAYOUT STAGE I STAGE II
  8. 8. NATIONAL WATER SUPPLY & DRAINAGE BOARD 3000 m3 concrete 4700 m3 concrete 2300 m3 concrete 3750 m3 concrete 1050 m3 concrete Sludge Units + Administration, Chemical, Chlorine and Staff Quarters buildings = 3700 m3 concrete ALL TOGETHER = 18500 m3 concrete
  9. 9. RAW WATER REGULATION TANK <ul><li>Purpose – to receive the raw water from intake plant </li></ul><ul><li>Pre-Chlorine will be added at the upstream via submerged distributor (for algae control) </li></ul>RAW WATER
  10. 10. FLOCCULATOR AND CLARIFER Clarifier 1 Floc Tank 1 Floc Tank 2 Floc Tank 3 Floc Tank 4 Floc Tank 5 Floc Tank 6 Clarifier 2 Clarifier 3 Clarifier 4 Clarifier 5 Clarifier 6
  11. 11. FLOCCULATION & CLARIFIER <ul><li>Double Stage Flocculation </li></ul><ul><li>Flocculation time = 27 minutes </li></ul><ul><li>2 flocculators in each tank </li></ul><ul><li>Flocculator type : propeller type </li></ul><ul><li>Driver : 1 st and 2 nd stage flocculator with variable speed drive </li></ul>CLARIFIEDWATER
  12. 12. LAMELLA CLARIFIER
  13. 13. FLOCCULATOR AND CLARIFIER <ul><li>Total: S=1900m2, V tanks =12500m3; V concrete =4700m3 </li></ul><ul><li>Total completion on 11.07.10 = 60% (2835m3 out of 4700m3) </li></ul>
  14. 14. FILTER - Design <ul><li>8 nos. of sand filter to be constructed. </li></ul><ul><li>Double bed rapid gravity filter </li></ul><ul><li>Constant flow, constant head type. </li></ul><ul><li>False bottom underdrain system. </li></ul><ul><li>Filtration Rate </li></ul><ul><ul><li>All in service – 8.3 m/hr </li></ul></ul><ul><ul><li>One out of service – 9.5 m/hr </li></ul></ul><ul><ul><li>Two out of service – 11.0 m/hr </li></ul></ul>
  15. 15. FILTER - Design <ul><li>Filter bed dimension : 14.73m (L) x 8.0m (W) </li></ul><ul><li>Each filter area : 117.8 m 2 </li></ul><ul><li>Each concrete slab : 1.203m (L) x 0.972m (W) x 0.1m (thk.) (small size of slab for easy maintenance and repair) </li></ul><ul><li>Nozzle bush is cast into the concrete slab where filter nozzle can be screwed in. </li></ul><ul><li>Filter nozzle is made of polypropylene material which is resistant to chemical (ie. Chlorine) . </li></ul>
  16. 16. FILTER - Design <ul><li>Filter Media: Sand + Gravel </li></ul><ul><ul><li>Sand effective size : 0.9 – 1.0 mm </li></ul></ul><ul><ul><li>Gravel effective size : 4.0 – 8.0 mm </li></ul></ul><ul><ul><li>Depth of sand media : 900 mm </li></ul></ul><ul><ul><li>Depth of gravel media : 100 mm </li></ul></ul><ul><ul><li>Uniform coefficient of sand media : ≤1.7 </li></ul></ul>
  17. 17. FILTER – In Service Filter 1 Filter 2 Filter 3 Filter 4 Filter 5 Filter 6 Filter 7 Filter 8
  18. 18. FILTER – In service CLARIFIED WATER FILTERED WATER CLARIFIED WATER
  19. 19. FILTER – In service Filter 1 Filter 2 Filter 3 Filter 4 Filter 5 Filter 6 Filter 7 Filter 8 FILTERED WATER TO CLEAR WATER TANK
  20. 20. FILTER
  21. 21. FILTER – Backwashing Combined Wash Rinsing Surface Sweeping Air Scour Air Scour Combined Wash Rinsing Surface Sweeping
  22. 22. FILTERS <ul><li>Total: S=1400m2, V tanks =7000m3; V concrete =1800m3 </li></ul><ul><li>Total completion on 11.07.10 = 62% (1125m3 out of 1800m3) </li></ul>
  23. 23. CONTACT/ CLEAR WATER TANK <ul><li>Contact Tank </li></ul><ul><ul><li>One R.C baffled contact tank with 2 compartments to be constructed </li></ul></ul><ul><ul><li>Post-lime is dosed at the outlet weir for pH adjustment </li></ul></ul><ul><ul><li>Volume: 3266 m 3 </li></ul></ul><ul><li>Clear Water Tank </li></ul><ul><ul><li>One Clear water tank with 2 compartments to be constructed </li></ul></ul><ul><ul><li>Volume: 6736 m 3 </li></ul></ul>
  24. 24. CONTACT/ CLEAR WATER TANK CONTACT TANK 1 CLEAR WATER TANK 1 FILTERED WATER TO CLEAR WATER TANK TREATED WATER TO PUMP HOUSE
  25. 25. Clear Water Tank <ul><li>Total: S=2200m2, V tanks =10000m3; V concrete =3750m3 </li></ul><ul><li>Total completion on 11.07.10 = 22% (816m3 out of 3750m3) </li></ul>
  26. 26. Organisation Chart <ul><li>Main Contractor Aarsleff (Civil works) –Salcon (M&E) Joint Venture </li></ul><ul><li>Aarsleff – 37 empl. (15 engineers – 6 expatriates (5DK+1LV), other locals); </li></ul><ul><li>Salcon – 3 engineers (1 from Malasia) + 8 prof. labor&supervisers for installation works; </li></ul><ul><li>Main Sub-Contractor from China - CGEO – 455 empl. (12 engineers (6 from China), 20 foreman (locals), 175 skill labor, 248 operators and helpers. </li></ul><ul><li>Client (Water Board) = Engineer ( 10-12 engineers); </li></ul><ul><li>ALL TOGETHER AROUND 50 ENGINEERS INVOLVED IN THE PROJECT </li></ul><ul><li>20 FOREMAN AND 225 SKILLED AND UNSKILLED LABOUR </li></ul>
  27. 27. …… .SOMETIMES THERE ARE MORE WHITE HELMETS THAN LABOUR ON SITE …… ..WALKING TO INSPECTION READY FOR INSPECTION
  28. 28. QUALITY ASSURANCE <ul><li>Batching plant is provided with two Silos 40tn/each; Capacity 30-35m3/h; Bar bending station is established on Site; </li></ul><ul><li>Laboratory on Site is organized for all kind of tests (soil, compaction, concrete cubes…and etc); </li></ul><ul><li>More than 40 Method Statements provided for every stage of the works (construction of structures, surveying setting out, clearing and grubbing, concrete repairs, hydrostatics pressure test, temporary and permanent sheet piling , traffic management and etc); </li></ul><ul><li>2 Quality Assurance Engineers from PAA and 2 from CGEO + 2 Safety Engineers daily participate in construction procedures….  </li></ul><ul><li>2 kinds of Daily reports, weekly&monthly reports, weekly production coordination meeting, weekly site meetings and etc are established on Site… </li></ul>
  29. 29. Isn ’ t it too much??
  30. 30. TOTAL PROGRESS FOR CIVIL WORKS = 45,5% (8430m3 out of 18500m3); MINIMUM 12 MONTHS DELAY IS EXPECTED
  31. 31. On my way to work I should be carefull….
  32. 32. Some living conditions are terrible….
  33. 33. Sometimes also selling too much….
  34. 34. Animals more often too meet at home….
  35. 35. PAA i n Sri Lanka
  36. 36. People in Sri Lanka….
  37. 37. … but the country is beautiful….

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