F. Wayne Hill, Water Resources Center, Extension, GA, USA
Key Data:
Treatment capacity
Phase I - 75,000m³/d; phase II - 152,000m³/d; final - 228,000m³/d
3D modelling package
AutoPlant
Project cost
$450 million
PHASE II PERMIT LIMITS
COD
25mg/L
NH3
0.5mg/L
Phosphorus
0.13mg/L (original); 0.1mg/L (EPD 2005); 0.08mg/L (compromise agreement)
Turbidity
1 NTU
Faecal coliforms
23 CFU/100ml
Maximum flow
152,000m³/d (monthly average); 190,000m³/d (weekly average)
MEMBRANE SYSTEM
Ultra-filter pore size
0.02µm (nominal)
Minimum driving pressure
3m water column (30kPa)
Operating mode
Direct (dead-end) filtration with periodic air and water backwash
Final installed capacity
1,800L/s
INCLINED PLATE SEPARATORS
Installation
72 stainless steel plate packs in 4 sedimentation basins
Effective flow rate range
55L/min to 660,000L/min
Project Timeline:
Commencement
March 2000
Plant design modelling wins award
July 2005
Compromise agreement reached
April 2005
DNR approve change to discharge rules
October 2005
Anticipated completion / opening
2007
Key Players:
Client
Gwinnett County
Operator
Department of Public Utilities (Gwinnett County)
Design and construction management
CH2M Hill, Jordan James & Goulding and Precision Planning
Site preparation
Beers Skansa
Biological facilities
Pizzagalli / Western Summit (JV)
Storage facilities
Atlantic Skansa (Beers)
Tertiary treatment membranes
Zenon
3D modelling software
Bentley
Clarifiers and inclined plate separators
US Filters
