Green River Filtration Facility Plant Overview PNWS-AWWA Conference Bellevue, WA Gary Fox & Hilary Lorenz April 29, 2015
2 IN THE BEGINNING
3 PILOT PLANT OWNED AND OPERATED BY TACOMA WATER STAFF
ALL THAT HARD WORK PAID OFF 10 gpm/sf high rate filtration approved by Washington State DOH April 2012. Donating the trailer to education Green River CC 4
GREEN RIVER FILTRATION FACILITY 5
OVERVIEW OF THE GRFF The Big Chunks: Sources - Green River and North Fork Well field Capacity - 90 MGD Conventional / 150 MGD Direct Chemicals Coagulant, coagulant aid, polymers Filter Media Dual media: Sand and anthracite Solids Process flow, Basins, Screw Press, and Haul 6
GRFF SITE PLAN WEST VS. SOUTH LAYOUT FILTERED WATER SOLIDS 7
PROCESS FLOW DIAGRAMS 8
MAY 15, 2012-0 MONTHS 9
DECEMBER 21, 2012 7 MONTHS 10
MAY 15, 2013 12 MONTHS 11
DECEMBER 19, 2013 19 MONTHS Upwards of 190 workers per day. Pumping ~ 10 MGD Ground Water 12
JUNE 17, 2014 26 MONTHS ~30,000 Cu/Yds of concrete poured site-wide 4464 Settling plates (304 SS material), pre-assembled in frames -per basin 13
DECEMBER 2, 2014 33 MONTHS Substantial Completion December 16! Declare filtration 5-1-15 14 14
APRIL 5, 2015 15 15
MAIN WATER PROCESS FLOW 16
INTAKE STRUCTURE IMPROVEMENTS 17
GREEN RIVER INTAKE PROJECT
GUIDE VANE ARRAY 19
BRUSH SCREEN CLEANER 20
BEHIND SCREEN-EDUCTOR BASIN 21
THE GREEN RIVER SUPPLY CONDUITS PROJECT AREA 4: 506 TWIN 5 Diam. Coal Tar lined Steel (1930 & 1960) PROJECT AREA 3: 716 8 Diam. Coal Tar lined Steel (1979) PROJECT AREA 2: 1180 concrete lined tunnel (1912, lined 1966) PROJECT AREA 1: 736-8 Diam. Polyurethane lined Steel (2003) 22
AREA 2- CONCRETE FINAL TUNNEL Tunnel Before Repair Work Tunnel After Repair Work 23
AREA 4: 1930 S 60 PIPELINE 1930 s Pipe Before Repair Work 1930 s Pipe Pitting Before Repair Work 24 24
AREA 4: 1930 S 60 PIPELINE 1930 s Pipe During Repair Work (prior to polyurea lining) 1930 s Pipe After Repair Work 25 25
AREA 4: 1960 S 60 PIPELINE 1960 s Pipe Before Repair Work 1960 s Pipe After Repair Work 26 26
NORTH FORK SUPPLY 27
NORTH FORK SUPPLY Natural river bank filtration Remote sites 7 miles upstream of GRFF 28
NORTH FORK TANK = 3MG BACKWASH SUPPLY TANK = 10 MG Blending Valves Existing 10 MG Tank (BW Supply) NFW Tank 29 29
TANK PIPING Ozone Injector Pump Station 2-way Isolation Vault BF-14-RW-103 BF-14-RW-102 Existing 10 MG Tank BF-14-RW-101 NFW Tank 3-way Isolation Vault 30 From NFW
NEW NFW TANK VS. EXISTING 10 MG TANK From North Fork Wellfield NFW Tank 10 MG Tank To Filter Backwash Overflow To Blending Facility 31
INSIDE THE 10MG TANK 32
33 OZONE SYSTEM
OZONE GENERATION AND SIDE-STREAM INJECTION 34 34
PRE-TREATMENT AND FLASH MIX 35
RAW WATER METERING STRUCTURE 36
FLASH MIX INJECTION AT THE DECK 37
CHEMICAL INJECTION GRID 38
FLASH MIX ACROSS A CHANNEL 16 39
CHEMICAL BUILDING AND COMPONENTS 40
NUMBER OF NEW TANKS: 20 INCLUDING NEW HYPO TANKS
COMPLEX CHEMICAL PIPING - REDUNDANCY 42
POINT A TO POINT Z FLEXIBILITY MANIFOLD ASSEMBLY COMMISSIONING AND STARTUP 43
PUMPS AND ACCESSORIES 44
EMULSIFIED POLYMER ACTIVATION Polymer Blending Units 45
CHEMICALS - FROM POINT A TO POINT B RED = Acidic PURPLE = Basic CPB 1 CPB 2 CPB 8 CPB 5 CPB 3 CPB 4 CPB 6 CPB 7 CPB 9 CPB 10 CPB 11 CPB 12 CPB 13 CPB 14 CPB 15 46
LABELS, LABELS, LABELS- LEFT OR RIGHT?
FLOCCULATION / SEDIMENTATION 48
FLOCCULATION AND SEDIMENTATION 4 flocculation trains 32 flocculators 44 x88 floc trains 20 minutes detention time @ 42 MGD 2 sedimentation basins with 90 MGD capacity winter 168 MGD summer (algae) 89 x89 sed basins Hybrid filtration plant 49 49
FLOW THROUGH FLOCCULATION AND SEDIMENTATION BASIN 50
PLATE SETTLERS 51
SLUDGE SCRAPERS 52
SOLIDS BUILDUP 53
CONSIDER THE MATTER SETTLED 54
55 FILTERS
FILTER SPECS: NUMBERS FOR THE NUMBERS PEOPLE Plant Capacity: 150 mgd Initial 168 mgd Ultimate Filter Type : Constant Level & Rate Number of Filters: 8 Cell Dimensions: 42 ft x 20 ft Cells per Filter: 2 Filter Area (each): 1,680 sf Filter Area (total): 13,440 sf Filtration Rate (Nominal not including recycle): -All 8 Filters 7.7 gpm/sf (150 mgd) 8.7 gpm/sf (168 mgd) 56 -One Off-Line 8.9 gpm/sf (150 mgd) 9.9 gpm/sf (168 mgd)
FILTER MEDIA SPECS: Criterion Value 57 Anthracite Media -Depth 50 in -Effective Size 1.32 ± 0.05 -Uniformity Coefficient <1.4 -Specific Gravity 1.65 Number of super sacks (2500 lbs) 1360 Sand Media -Depth 20 in -Effective Size 0.66 ± 0.03 -Uniformity Coefficient <1.4 -Specific Gravity 2.63 Number of super sacks (4000 lbs) 688
STAINLESS STEEL UNDERDRAINS Low Rate Backwash with Air Scour Filtration 58
LOADING FILTER MEDIA 59
FILTERING SOLIDS BACKWASH WATER OUT OF FILTERS SETTLED WATER INTO FILTERS 60
FILTER PIPE GALLERY 61
FINISHED WATER PUMP STATION 62
5 PUMPS 200 HP EACH 73 MGD CAPACITY 63
64
FILTER OUTLET WEIR STRUCTURE Filtered unchlorinated SHC, CS, F- added 65
108 BUTTERFLY VALVE 66
67 CLEARWELLS
CLEARWELLS 6.6 MG Capacity 285 D x 15 H 1.3 MG Capacity 80 D x 35 H 68
SHC NaOH HFA SHC NaOH HFA SHC NaOH BACKGROUND WHAT IS CLEARWELL USED FOR? Clearwells provide operational storage to accommodate short-term variations between plant production and plant outflow, to allow for a controlled shutdown and to maintain hydraulic grade lines in P1 and P5 pipelines. CT is achieved in P1 and P5 pipelines, not in the clearwells. Total Volume Operational Volume Max. Design Flow of Served Pipeline Emergency Supply Duration at Peak Flow P1 Clearwell 1.3 MG 0.45 MG 73 MGD 25 min (3 hour with 10 MG tank supply) P5 Clearwell 6.6 MG 6.2 MG 95 MGD 1.6 hour Max WSE 957.5 Min Service EL 922 10 MG Tank SHC Max WSE 905 Min Service EL 893 P1 Clearwell SA20 M M M M P1 PEG SA18 Existing Sample Station #5 Backwash Pump Station Max WSE 876 SA21 From Filter Effluent Filter Outlet Weir Structure SA19 Finished Water Pump Station Min Service EL 860 Stormwater Wetpond P5 Clearwell Energy Dissipation structure M M P5 69
P1 CLEARWELL & STAND PIPE N BF-07-FW-103 BF-07-FW-101 BF-07-FW-102 70
P1 CLEARWELL 10 STAND PIPE 71
SCHEMATIC OF BACKWASH SUPPLY FIGURE 13-1 72
P5 CLEARWELL EL 874.00 73
INSIDE P5 CLEARWELL 74
SOLIDS PRODUCTION FACILITY 75
SOLIDS HANDLING MAIN PROCESS FLOW 76
PEG PEG Overflow PEG PEG SHC SOLIDS PROCESS FLOW DAIGRAM FWW From Filters Washwater Equalization Basins Washwater Equalization Basins Pump Station Sludge From Flocculation/ Sedimentatio n Basins Thickener Decant M Pressate Thickener Sludge Blending Tank Overflow Washwater Clarifiers Sludge M Solids Metering Vault M Decant Floc/Sed Drain and Sludge Bypass Geobags From FTW Return Equalizatio n Basin Screw Press No. 1 Hauled Offsite Decant Structure Sludge Storage Basin Pump Station Sludge Storage Basin Screw Press No. 2 Return Water To Ozone Reactors Thickened Sludge Pump Station Pressate Hauled Offsite Hauled Offsite Return Water To Rapid Mix Channel 77
EAST PLANT SOLIDS PRODUCTION 78
RETURN WATER PS 79
THICKENER 80
WASHWATER CLARIFIERS 2 BASINS (20 X42 EACH) SIDE WATER DEPTH = 15 FEET DESIGN FLOW: o o 3,200 gpm (Normal) 6,400 gpm (Max) SURFACE LOADING RATE = 3.8 GPM/SF EFFECTIVE PLATE LOADING RATE = 0.35 GPM/SF Inflow pipes from Washwater EQ Basins Pump Station 81
INCLINED PLATE SETTLERS DESIGN CRITERIA: DESIGN CAPACITY: 6,400 GPM (9.22 MGD); 3,200 GPM / BASIN DESIGN EFFECTIVE LOADING RATE: 0.35 GPM/SF HYDRAULIC CAPACITY: 6,400 GPM / BASIN 0.7 GPM/SF 82
SLUDGE BLENDING 3-5% SOLIDS 83
THICKENED SLUDGE PUMP STATION PROGRESSIVE CAVITY PUMPS 84
MECHANICAL DEWATERING 85
SCREW PRESS CROSS SECTION STEAM INLET http://www.fkcscrewpress.com/spintro.html 86
SCREW PRESSES - 24 DRY TONS / DAY 3.3 18 87
SCREW PRESS FLOCCULATION TANK -SNF Polydyne Chemical A-6320 (Anionic polymer) -Dosing 7 lbs active polymer per dry ton of solids 88
PRESSATE 89
CAKE- 25% SOLIDS 90
CONTAINER BAYS 91
AWAY THEY GO 92