Green River Filtration Facility

Plant Overview

PNWS-AWWA Conference

Bellevue, WA

Gary Fox & Hilary Lorenz

April 29, 2015

IN THE BEGINNING…

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PILOT PLANT – OWNED AND OPERATED

BY TACOMA WATER STAFF

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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

GREEN RIVER

FILTRATION FACILITY

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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

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GRFF SITE PLAN – WEST VS. SOUTH LAYOUT

SOLIDS

FILTERED WATER

PROCESS FLOW DIAGRAMS

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MAY 15, 2012 - 0 MONTHS

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DECEMBER 21, 2012 – 7 MONTHS

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MAY 15, 2013 – 12 MONTHS

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DECEMBER 19, 2013 – 19 MONTHS

Upwards of 190 workers per day.

Pumping ~ 10 MGD Ground Water

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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

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DECEMBER 2, 2014 – 33 MONTHS

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Substantial Completion – December 16!

Declare filtration 5-1-15

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APRIL 5, 2015

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MAIN WATER PROCESS FLOW

INTAKE STRUCTURE

IMPROVEMENTS

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GREEN RIVER INTAKE PROJECT

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GUIDE VANE ARRAY

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BRUSH SCREEN CLEANER

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BEHIND SCREEN-EDUCTOR BASIN

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THE GREEN RIVER SUPPLY CONDUITS

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PROJECT AREA 1: 736’ - 8’ Diam. Polyurethane lined Steel (2003)

PROJECT AREA 2: 1180’ – concrete lined tunnel (1912, lined 1966)

PROJECT AREA 3: 716’ – 8’ Diam. Coal Tar lined Steel (1979)

PROJECT AREA 4: 506’ – TWIN 5’ Diam. Coal Tar lined Steel (1930 & 1960)

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AREA 2- CONCRETE FINAL TUNNEL

Tunnel Before Repair Work Tunnel After Repair Work

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AREA 4: 1930’S 60” PIPELINE

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1930’s Pipe Before Repair Work 1930’s Pipe Pitting Before Repair Work

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AREA 4: 1930’S 60” PIPELINE

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1930’s Pipe After Repair Work 1930’s Pipe During Repair Work (prior to polyurea lining)

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AREA 4: 1960’S 60” PIPELINE

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1960’s Pipe Before Repair Work 1960’s Pipe After Repair Work

NORTH FORK

SUPPLY

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NORTH FORK SUPPLY

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Natural river bank filtration

Remote sites – 7 miles upstream of GRFF

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NORTH FORK TANK = 3MG

BACKWASH SUPPLY TANK = 10 MG

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Blending Valves

Existing 10 MG Tank (BW Supply)

NFW Tank

TANK PIPING

30 From NFW

Wellfield

BF-14-RW-101

Ozone Injector

Pump Station

BF-14-RW-103

BF-14-RW-102

NFW Tank

Existing 10 MG Tank

2-way

Isolation

Vault

3-way

Isolation

Vault

NEW NFW TANK VS. EXISTING 10 MG TANK

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From North

Fork Wellfield

NFW Tank 10 MG Tank

To Filter

Backwash

Overflow

To Blending

Facility

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INSIDE THE 10MG TANK

OZONE SYSTEM

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OZONE GENERATION AND SIDE-STREAM

INJECTION

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PRE-TREATMENT

AND FLASH MIX

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RAW WATER METERING STRUCTURE

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FLASH MIX INJECTION AT THE DECK

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CHEMICAL INJECTION GRID

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FLASH MIX ACROSS A CHANNEL

16’

CHEMICAL BUILDING

AND COMPONENTS

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NUMBER OF NEW TANKS: 20 INCLUDING NEW

HYPO TANKS

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COMPLEX CHEMICAL PIPING - REDUNDANCY

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POINT A TO POINT Z FLEXIBILITY

MANIFOLD ASSEMBLY

COMMISSIONING AND STARTUP

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PUMPS AND ACCESSORIES

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Polymer Blending

Units

EMULSIFIED POLYMER ACTIVATION

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CHEMICALS - FROM POINT A TO POINT B

CPB 1

CPB 2

CPB 3

CPB 4 CPB 5

CPB 6 CPB 7

CPB 8

CPB 12

CPB 11

CPB 15

CPB 9

CPB 10

CPB 13

CPB 14

RED = Acidic

PURPLE = Basic

LABELS, LABELS, LABELS- LEFT OR RIGHT?

FLOCCULATION /

SEDIMENTATION

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FLOCCULATION AND SEDIMENTATION

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• 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

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FLOW THROUGH FLOCCULATION AND SEDIMENTATION BASIN

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PLATE SETTLERS

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SLUDGE SCRAPERS

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SOLIDS BUILDUP

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CONSIDER THE MATTER SETTLED

FILTERS

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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)

-One Off-Line 8.9 gpm/sf (150 mgd)

9.9 gpm/sf (168 mgd)

FILTER MEDIA SPECS:

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Criterion Value

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

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Filtration

Low Rate Backwash

with Air Scour

LOADING FILTER MEDIA

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FILTERING SOLIDS

SETTLED WATER INTO FILTERS

BACKWASH WATER OUT OF FILTERS

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FILTER PIPE GALLERY

FINISHED WATER

PUMP STATION

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5 PUMPS – 200 HP EACH – 73 MGD CAPACITY

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FILTER OUTLET WEIR STRUCTURE

Filtered unchlorinated

SHC, CS, F- added

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108” BUTTERFLY VALVE

CLEARWELLS

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CLEARWELLS

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6.6 MG Capacity

1.3 MG Capacity

285’D x 15’H

80’D x 35’H

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

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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.

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NaO

H

SH

C

NaO

H

SH

C

SHC

HF

A

HF

A

NaO

H

SH

C PEG

10 MG Tank

From Filter Effluent

Filter Outlet

Weir Structure

Finished Water

Pump Station

Backwash

Pump Station

P1 Clearwell

P5 Clearwell

P1

P5

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SA18

SA19

SA20

SA21

Existing

Sample

Station #5

Stormwater

Wetpond

Max WSE 905’

Min Service EL 893’

Max WSE 876’

Min Service EL 860’

Max WSE 957.5’

Min Service EL 922’

Energy

Dissipation

structure

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M

M

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P1 CLEARWELL & STAND PIPE

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BF-07-FW-101

BF-07-FW-102

BF-07-FW-103

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P1 CLEARWELL – 10’ STAND PIPE

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SCHEMATIC OF BACKWASH SUPPLY – FIGURE

13-1

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P5 CLEARWELL

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EL 874.00

INSIDE P5 CLEARWELL

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SOLIDS

PRODUCTION

FACILITY

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SOLIDS HANDLING – MAIN PROCESS FLOW

SOLIDS PROCESS FLOW DAIGRAM

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FWW

From

Filters

Washwater

Equalization

Basins

Washwater

Equalization

Basins

Pump

Station PE

G

M

Sludge From

Flocculation/

Sedimentatio

n Basins

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M

Washwater

Clarifiers Solids Metering

Vault

PE

G

Thickener Sludge

Blending Tank

Sludge

Thickener

Decant

Screw Press No. 1

Screw Press No. 2

PE

G

PE

G

Hauled Offsite

Hauled Offsite

Hauled Offsite Pressate

Pressate

Thickened

Sludge Pump

Station

Return Water To

Ozone Reactors

Return Water To

Rapid Mix Channel

Decant Structure

Return

Equalizatio

n Basin

Sludge Storage Basin

Geobags

From

FTW

Floc/Sed Drain

and Sludge

Bypass

Decant

Overflow

Ove

rflo

w

Sludge Storage

Basin

Pump Station

SH

C

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EAST PLANT SOLIDS PRODUCTION

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RETURN WATER PS

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THICKENER

WASHWATER CLARIFIERS

• 2 BASINS (20’X42’ EACH)

• SIDE WATER DEPTH =

15 FEET

• DESIGN FLOW:

o 3,200 gpm (Normal)

o 6,400 gpm (Max)

• SURFACE LOADING

RATE =

3.8 GPM/SF

• EFFECTIVE PLATE

LOADING RATE =

0.35 GPM/SF

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Inflow pipes from Washwater

EQ Basins Pump Station

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

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SLUDGE BLENDING 3-5% SOLIDS

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THICKENED SLUDGE PUMP STATION – PROGRESSIVE

CAVITY PUMPS

MECHANICAL

DEWATERING

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SCREW PRESS CROSS SECTION

STEAM INLET

http://www.fkcscrewpress.com/spintro.html

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SCREW PRESSES - 24 DRY TONS / DAY

3.3’

18’

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SCREW PRESS FLOCCULATION TANK

-SNF Polydyne Chemical A-6320 (Anionic polymer) -Dosing 7 lbs active polymer per dry ton of solids

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PRESSATE

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CAKE- 25% SOLIDS

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CONTAINER BAYS

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AWAY THEY GO