Page 168 - ro membanes

7.5 CONSTRUCTION COSTS OF LAMELLA SETTLERS AND DAF CLARIFIERS 151 TABLE 7.2 Example of DAF Clarification System for 50,000 m3/day (13.2 MGD)
SWRO Desalination Plant
Component/Parameter
FEED WATER
• Design flow rate, m3/day (MGD) • Turbidity, NTU
• SDI
DESIGN CHEMICAL DOSAGES
• Ferric chloride, mg/L
• Cationic polymer, mg/L
• Sulfuric acid, mg/L e Target pH e 6.7
FLOCCULATION TANK
• Number per DAF tank • Total number
• Width, m (ft)
• Length, m (ft)
• Depth, m (ft)
• Number of mixers per tank • Total retention time
DAF TANKS
• Number
• Width, m (ft)
• Length, m (ft)
• Depth, m (ft)
• Total surface area
• Surface contact zone area
• Surface flotation area
• Surface loading rate @ 15% recycle
CIRCULATION PUMPS
• Number
• Capacity
• Delivery head
AIR COMPRESSOR
• Number
• Capacity
• Delivery pressure
DAF SATURATOR TANKS
• Number
• Capacity per tank
• Net volume per tank
Specifications/Design Criteria
127,910 (33.8 MGD) 0.5e80
6e16
15 (0.5e50 mg/L) 0.5 (0.0e1.0 mg/L) 8 (0e30 mg/L)
1
6
4.85 (15.9 ft) 8.0 (26.4 ft) 4.9 (16.1 ft) 2
13 min
6
4.85 (15.9 ft)
10.0 (32.8 ft)
4.9 (16.1 ft)
291 m2 (3132 ft2)
57 m2 (620 ft2)
234 m2 (2548 ft2)
26.2 m3/m2 h (10.7 gpm/ft2)
6þ1
133 m3/h (680 gpm) 7 bars (100 psi)
6þ1
15 m3/h (66 gpm) 10 bars (142 psi)
6
100 m3/h (440 gpm) 4 m3 (1060 gallons)