Cary / Apex Water Treatment Plant, NC, USA
Key Data:
Plant treatment capacity
Initial - 60,000m³/d; phase 1 - 90,000m³/d; phase 2 - 150,000m³/d
Plant storage capacity
30,000m³
Flocculator clarifier capacity
30,000m³/d per unit
Filters
10 x multi-media filters
Disinfection
Initial - ozone; final - ammonia and chlorine
Fluoride addition
1ppm
Project cost
$70 million
Water Quality
(Raw Water / Treated Water)
Iron (mg/l)
0.151 / 0.029
Manganese (mg/l)
0.277 / 0.012
Calcium (mg/l)
n/a / 8.48
Magnesium (mg/l)
n/a / 2.20
Sulphate (mg/l)
n/a / 25.1
Chloride (mg/l)
15.3 / 10.5
Dissolved Solids (mg/l)
n/a / 75
Hardness (mg/l)
33.1 / 30.25
Total phosphorus (mg/l)
0.03 / 0.05
Turbidity (NTU)
3.97 / 0.29
pH (pH units)
6.9 / 7.2
Faecal coliforms (per100ml)
333 / 0
Project Timeline:
Plant opened
1993
Expansion programme agreed
1999
Contract awarded
October 1999
Pipeline construction completed
January 2001
Reclaimed water system in service
June 2001
Phase 1 completed
April 2002
Phase 2 completed
August 2002
Water Safety Award
January 2004
Key Players:
Plant joint owners
Towns of Cary and Apex
Plant operator
Cary Public Works & Utilities Department
Consulting engineers
Camp, Dresser and McKee
Main contractor
Crowder Construction
Flocculator clarifier suppliers
Ondeo Degremont (formerly Infilco Degremont)
Electrical work
Bryant Electric
Pipeline construction
Rockdale Pipeline Inc
Other contractors
Dellinger, Acorn Industrial
