shoal creek brochure (pdf)

33

Our MissionThe mission of Shoal Creek Filter Plant and the Gwinnett Department of Water Resources is to enhance quality of life by providing excellent water, wastewater, and stormwater services at the best possible valueto our customers while preserving natural water resources.

www.gwinnettcounty.com I (770) 904-3200 I Gwinnett County Department of Water Resources I Shoal Creek Filter Plant

Turbidity.....................................1.0-2.0 NTUpH...................... ............. 6.9 Avg.Alkalinity.. ..... ..... ...... 16 Mg/l Color....... ................ 9 APHA Units Hardness......................................... 14 Mg/l

Raw Water Source

> lake lanier > raw water pump station

External View of Facility

Internal View of Facility

Pump Station Facts

Raw Water Characteristics

Lake Facts

Constructed from 1946 to 1956

Named after Poet Sidney Lanier

Fed by the Chattahooch-ee and Chestatee Rivers

39,000 acres and 540 miles of shoreline

Water Source for Metro Atlanta and 60-70% of Georgia

(2) 72” Transmission Lines

(4) Pumps for Shoal Creek Filter Plant700 HP Pumps w/ 30 MGD Capacity each

(4) Redundant - Lanier Filter Plant Pumps2500 HP Pumps w/ 50 MGD Capacity each

(2) 4 million gallon tanks, open top, with a 35’ depth

Serviced by twin 72’ steel pipes from the raw water pumping station

96” outlet to Ozone Facility

Low profile - Eco Friendly

Intake Shaft located at a level of 1025 ft

Tunnel is 12’ in diameter and 627’ long

Feeds raw water from lake into pump station wet well

> raw water intake & storage

Raw Water Equalization Storage Tanks

Raw Water Intake

Pump Shaft 12 Foot Diameter Tunnel

Lake Lanier

Elevation - 1025 Feet

Raw Water 2-3 I Ozonation 4-5 I Aerial Overview 6-7 I Filtration 8-9 I Quality Control & Distribution 10-11

2 3 www.gwinnettcounty.com I (770) 904-3200 I Gwinnett County Department of Water Resources I Shoal Creek Filter Plant

> > > >

> >

> >

Liquid O

Benefits and Purpose of Ozone Treatment

Generator

J - Tube

Ozone (O3) at the Shoal Creek Filter Plant is produced by passing pure oxygen through a 4000 Volt DC electrical discharge which ruptures the individual oxygen molecule and forms two oxygen radicals. These radicals combine with oxygen molecules to form

ozone. (O2 + O = O3)

* Inactivation of cryptosporidium, giardia, viruses, bacteria, and other microbial contaminants.

* Effective in the oxidation of tastes, odor, and colors.

* Aids in the coagulation and flocculation process.

* Eliminates Trihalomethanes when used in place of chlorine as a pre-treatment disinfectant.

Shoal Creek Ozone Facility Facts* (3) Ozonia Generators rated at 2400 lbs/day production capacity.

* Sized for 1 log removal credit of Cryptosporidium.

* (2) One Million Gallon Serpentine Baffled Contactors with 15 minute

contact time at maximum plant capacity.

GaseousOxygen

Fuses

Ozone gas from the generator is introduced through a side stream injector into an exter-nal J-Tube applicator for mixing with the raw source water. The ozi-nated water then flows through a one million gallon, serpentine baf-fled contactor to pro-vide disinfection and oxidation contact times.

Unused and unreacted ozone gathers in the upper levels of the contactor. This remaining ozone is collected and passed through a thermal and catalytic ozone

destruct unit for environmentally safe dis-charge well below EPA guidelines.

Evaporatorsygen

Ozone Destruct Unit

Liquid Oxygen

To Filtration

Contactor

Ozone Gas

> ozone generation and removal

> >

> >

> >

> > > >



To Clearwells

Fluoride

Phosphate

Rapid Mix Flocculation Basin

Filter Bed

Post Chemical Application

Rapid Mix Overview* (2) 12’ by 12’ two-stage rapid Mix basins.

* Injection points for Coagulants (Ferric Chloride and Cationic Polymer).

* Coagulants (+ Charge) are rapidly mixed with the incoming flow of water to promote the attraction of suspended particles (- Charge).

* (3) 21’ by 21’ three-stage flocculation basins.

* Mixing is progressively slowed down to form a larger and more durable cluster of particles known as “floc”, which is ready for removal by filtration.

Flocculation Overview

Filter Bed Overview* (6) High rate Gravity Filters with 1512 square feet each.

* Filtration Rate - 7.5 gallons per minute per square foot.

* Dual Media consisting of 6’ of Anthracite coal and 1’ of Silica Sand.

Filtration Process Overview* Floc is captured as it passes through the filter media.

* Under drain system of porous plates provide filter media support and uniform collection of filtered water.

Anthracite Coal

Silica Sand

Under drain

Chlorine

Lime

Ferric Chloride Injection

Polymer Injection



> filtration process

> laboratory

Process & Quality Control

Lab testing performed every hour.

Water samples tested at numerous points in the treatment process.

Testing Includes - Turbidity, pH, electrical - conductivity, chlorine, phosphate, and fluoride.

> maintenance & operations

Preventative & Continuous

Quality Control

The maintenance group is an integral part of the water production process. Maintaining the electrical / electronic mechanical equipment to a high degree of reliability is accomplished via implementation of an aggressive preven-tative maintenance program as well as open communication with the operational group to identify any corrective proce-dures that need to be performed.

Tests Performed Goals

Turbidity............................ .000 - .050 NTUpH................................................7.10 - 7.30Chlorine.................................1.60 -1.80 ppm Phosphate......................................1.20 ppmFluoride........................................ .80 ppm

Operations Control Center

Licensed operators continuously monitor, interpret, and adjust online plant systems to produce the best possible drinking water for the citizens of Gwinnett County.

> finished water > distribution

High Service Pump Station & Storage

4 Filter to Waste Pumps

4 Backwash Pumps

2 Lanier Transfer Pumps

2 Central Pumps

3 Plant Water Pumps.

Water saving filter backwash equalization in three con-centric tanks allow the water to be returned for maxi-mum conservation.

Backwash Water & Handling

Serving Gwinnett CountyThe county distributes safe drinking water to over 800,000 citizens through a network of 3,500 miles of water mains ranging in size from 10” to 78”. Nine booster stations are strategically placed throughout the county to maintain proper water pressures for 250,000 service connections and fire fighting protection. Distribution processes including tank levels and system pressures are monitored and con-trolled 24 hours a day through the county’s computerized SCADA system.

Scada

78

20

29

29

24

48

48

48

24

48

48

30

30

3024

36

48

48 16

24

24

24

78

78

85

985

85

85

85

985

OLD PEACHTREE RD

PEACHTREE INDUSTRIA

L BLVD

OAK RD

FENCE RD

LEE RD

ROSE

BUD

RD

NEW HOPE RD

ROCKBRIDGE RD

FIVE FORKS TRICKUM RD

PLEASANT HILL RD

CLUB DR

KILLIAN HILL RD

PATE RD

HARBINS RD

OLD NORCROSS RD

HOG MTN RD

LENO

RA C

HURC

H RD

BROOKS RD

COLLINS HILL RD

HEWATT RD

RONALD REAGAN PKWY

DACULA RD

SPALDING DR

ROSS RD

SATELLITE BLVD

CHANDLER RD

NORT

H RD

SEVER RD

RIVER DR

LUKE EDWARDS RD

DOGWOOD RD

WEBB GIN HOUSE RD

COLE DR

RUSSELL RD

CEDARS RD

OZORA RD

EWING CHAPEL RD

SIMONTON RD

BOGGS RD

OLD FOUNTAIN RD

GRAYSON PKWY

RIDG

E RD

BURNS RD

ANNISTOWN RD

MINK LIVSEY RD

LENORA RD

SKYLAND DR

HILLSIDE DR

INDIAN SHOALS RD

SINGLETON RD

OLD LOGANVILLE RD

S LEE ST

ROCK SPRINGS RD

DICK

ENS

RD

N BOGAN RD

PINEHURST RD

LESTER RD

HURRICANE SHOALS RD

ARNOLD RD

SHAN

NON

RD

PIRKLE RD

BUSH RD

S BOGAN RD

DEAN RD

ALCOVY RD

BOLD SPRINGS RD

S ROCKBRIDGE RDHERRINGTON RD

BRITT RD

BUNTEN RD

PADEN DR

HAMILITON MILL RD

HUFF D

R

KILGORE R

D

SARD

IS C

HURC

H RD

HIGHPOINT RD

SHADBURN AVE

MINERAL SPRINGS RD

MILLER RD

CLACK RD

PARKWOOD RD

BEST FRIEND RD

STONE DR

McGINNIS FERRY RD

N BR

OWN

RD

SUGARLOAF PKWY

MT M

ORIAH RD

JAMES RD

MCDANIEL RD

WOODWARD MILL RD

BETHANY CHURCH RD

STO

NE M

TN S

T

PATTERSON RD

LAKE LUCERNE RD

HOSEA RD

PHARRS RD

MEA

DOW

CHU

RCH

RD

POND RD

MOON PLACE RD

MOON RD

ZOAR RD

JOHNSON RD

MITCHELL ST

E JONES BRIDGE RD

HOLCOMB BRIDGE RD

ROBERTS ST

ROGERS BRIDGE RD

PURC

ELL

RD

CRUSE RD

CAM

PBEL

L RD

LAWRENCE RD

MARTINS CHAPEL RD

AMWILER RD

ATKINSON RD

MAIN ST

NORT

HBRO

OK P

KWY

MARTIN NASH RD

W PRICE RD

DROWNING CREEK RD

BURNETTE RD

SIM

PSON

CIR

OLD

ROSS

ER R

D

S SCALES RD

JONES MILL RD

BAILEY WOODS RD

THOMPSON MILL RD

GRAVES RD

N DE

SHON

G RD

N PUCKETT RD

SUGARLOAF PKWY

JOHNSON RD

PLEASANT HILL RD

HARBINS RDNEW HOPE RD

SATELLITE BLVD

RIDGE RD

OLD NORCROSS RD

OZORA RD

20

324

124

29

23

78

120

141

378

21120

20

20

LANIER INTAKE

ROCK QUARRYTANK

SHOAL CREEK INTAKE

LANIER FILTER PLANTSHOAL CREEK FILTER PLANT

NOB HILL TANK

GRAYSONTANK & PUMP

NORCROSSTANK & PUMP

BOGAN ROADTANK & PUMP

ROCKBRIDGETANK & PUMP

MEDLOCK BRIDGETANK & PUMP

GOSHEN SPRINGSTANK & PUMP

LANIER MOUNTAIN TANK & PUMP



2

Ozone gas is produced onsite and then injected into the raw water as it flows through (2) one million gallon contactors. The highly effective ozone gas destroys Cryptosporidium, bacteria, and viruses and oxidizes organics, taste, odors and color for a safe and aesthetically pleasing drinking water.

Safe drinking water is distributed to Gwinnett County through a network of 3,500 miles of water mains. Distribution processes including tank levels and system pressures are monitored and controlled 24 hours a day through the county’s computerized SCADA system.

Raw Water is pumped from Lake Lanier’s 35,000-acre reservoir into the plant’s (2) four million gallon equalization storage tanks. Operators set the plant production rate and gravity feed the raw water into the Ozone facility for the first stage of treat-ment.

Water quality parameters are continuously monitored through in-line analyzers which are strategically placed throughout the plant process. Hourly grab sample testing includes; turbidity, pH, electrical conductiv-ity, as well as chlorine, phosphate and fluo-ride residuals. Licensed operators monitor, interpret, and adjust online plant systems to produce the best possible drinking water for the citizens of Gwinnett County.

Filtration is the next stage of treatment where the destroyed microorganisms and other suspended particles are clumped together and then removed as the water passes though the high rate filters consisting of anthracite coal and silica sand.

The ozinated and filtered water is then injected with chlorine, phosphate, lime and fluoride as it flows into (2) ten million gallon clearwells for storage before dis-tribution. These post filtration chemicals protect the piping system from corrosion and the drinking water from bacterial intru-sion during distribution to the citizens of Gwinnett County.

Safe Drinking Water is the key to the continuous improvement of the quality of life for the citizens of Gwinnett County.

shoal creek brochure (pdf)

Documents