clean and safe drinking water workshop … workshop gander 22nd september 2004. ... use of peaty...
TRANSCRIPT
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CLEAN AND SAFE DRINKING WATER WORKSHOP
GANDER
22ND SEPTEMBER 2004
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SAFE WATER FOR CONNE RIVER
LEWIS PAINPCI MEMBRANE SYSTEMS, INC
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The ProblemUse of peaty lake and river waters for water supply in small communities.The brown color from natural organics in these surface waters reacts with chlorine, used for disinfection, and produces high levels of carcinogenicTHM’s & HAAs
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Bacteria and viruses and chlorine resistant pathogens in these surface waters can make the water unsafe fordrinking e.g. Beaver Fever and other dangerous stomach disorders
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These surface waters often have high levels of Iron, Manganese and Aluminum in them requiring removal to meet standards
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Current drinking water standards:
Canadian: 100 µg/l THMs, no regs for HAAs
USA: 80 µg/l THMs, 60 µg/l HAAs
Future: further tightening?
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Source: A dammed stream off the Southwest Pond
Prior Treatment: chlorination only
THMs: average of 66 samples was 189 µg/l (according to latest figures on Dept. of Environment website)
Conne River
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Early in 2001 DMG (of Gander) & 3D-N Engineering Services (of Markham Ontario) were asked to look at treatment options
Different technologies considered: various types of filtration (rapid, direct, slow sand, etc.), adsorption technologies, micro-sand filters, membrane technology
Initial Study
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Questions asked:• Would the colour requirements be met?• Was the technology capable of 4 log removal of
giardia cysts?• Was the technology proven?• Additional requirements (i.e. chemical
precipitation)?• Other considerations included serviceability,
ease of operation & community benefit• Decision: To pilot adsorption & membrane
technologies
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What is a membrane?A Basic View
Permeating Species
Retained Species
Driving Force
Membrane
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Membrane Structure
Dense Layer Retentate or Reject
Macroporous sub-layer
Substrate LayerPermeate(Treated Water)
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Membrane TechnologiesMembrane TechnologiesReverseOsmosis
Nanofiltration Ultrafiltration Microfiltration
RO NF UF MF
Susp SolidsBugs +OrganicsSalinity
Susp SolidsBugs +Organics
Susp SolidsBugs +
Susp SolidsBugs
DesalinationNO3 removal
Colourremoval
Crypto/virusremoval
Cryptoremoval
99% NaClretention
500 MWCO 0.03µ 0.2µ
tighter separation
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Membrane SeparationsA Basic View NF
Suspended solids, turbidity, colloidal material, microbes
Driving Force
Membrane
SaltsWater
Colour
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Relative sizesRelative sizes
Crypto cyst 4µE.Coli 0.5 x 2.5µ
Bacillus Spore 0.8 x 1.5µ
Virus 0.03-0.05µ
. 0.005-0.01µ
NF Membrane pore size < 0.005µNF Membrane pore size < 0.005µNF Membrane pore size < 0.005µ
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60% to 85% Recovery of
Raw Water
Treated Water or Permeate
Reject / Surplus Water
15% to 40%
Design Parameters: Flux & Recovery of Water
Flux is the volume of water or permeate produced per unit area in a certain time i.e. liters per m2 per hour (lmh)
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Membrane selection for piloting:
• Nanofiltration: for removal of colour and dissolved organics
• Spiral wound configuration:- capacity > 0.5 MLD therefore most economic configuration
- high membrane surface area per unit volume - compact
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Spiral membrane configuration:Two layers of membranes separated by a spacer -
glued around three edges
Raw Water Flow Direction above and below leaf
Product Tube
Filtrate Flow Direction
Filtered Water out Leaf
Multiple leaves connected to product tube and wrapped around tube to form an element
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Spiral Membrane Elements
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Spiral Membrane Pressure VesselSpiral Membrane Pressure Vessel
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Membrane Pressure VesselMembrane Pressure VesselMembrane Pressure Vessel
raw water in
permeate
raw water out
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Spiral Membrane Pilot Plant
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Membrane pilot plant flow diagramDual media filters:1 duty, 1 in backwash or on standby
Cartridge Filter
Recycle Pump
Raw Water
Recycle Flow
Surplus Water (reject)
Treated Water (permeate)
Membrane Pressure Vessels
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Conne River Pilot Data
0.010.020.030.040.050.060.070.080.090.0
3/22/2
002
3/31/2
002
4/6/20
024/1
1/200
24/1
6/200
24/2
1/200
24/2
7/200
25/2
/2002
5/7/20
025/1
2/200
25/1
7/200
25/2
2/200
25/2
7/200
26/1
/2002
6/6/20
02
Date
LMH@5CRecovery
Flux
Recovery
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Membrane Pilot Plant Results• Pilot ran for 110 days• Simple operation• Minimal fouling• Minor adjustments required once or
twice a week to maintain flux & recovery• Chemical cleaning every 2½ weeks• Reduction of colour (100%), TOC (70%),
& metals including aluminum (70%)
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Reasons for Selecting Membranes• High quality water to meet current guidelines and
upcoming regulations
• Reliable in its simplicity
• No chemicals used as part of the treatment process
• Low labour cost
• Low maintenance cost• Low life cycle cost• Easily expanded/shrunk to meet rising/falling demand
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Raw Water Spec for Conne River• Colour up to 80 Colour Units• DOC 5 to 10 mg/l• Iron up to 0.25 mg/l• Aluminum up to 0.13 mg/l• pH 5.3 to 6.0• Turbidity Up to 10 NTU• Temperature 3 to 20 deg C
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Simplified Flow Diagram
MEDIA F ILTER
CARTRIDGEFILTER
BACKWASH
WASTESTORAGE
CLEANINGTANK
RECYCLESURPLUSWATER
TREATEDWATER
CARBONATE DOSING
MEMBRANESTACK
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Membrane System Equipment • Media filters: 6 pressure vessels -
backwash on time or ∆P• Cartridge filters: 10 micron nominal• Membrane plant: 29 eight inch pressure vessels• Membrane area: 5,684 m2• Cleaning tank: 2,000 gallons• Post-treatment: sodium carbonate dosing (pH
7) & chlorination
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Membrane System Equipment (Cont.) • Installed power: 52.5 kW for feed & recycle
pumps (production); 4.7 kW for mixers & 30 kW cleaning tank heater (intermittent use)
• Waste tank: 90 m3 - holds sand filter backwash & spent cleaning solutions
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Membrane System Equipment (Cont.) • Instrumentation:
• pressure sensors• differential pressure sensors • raw and treated water turbidity• temperature sensors• final water pH• flow meters (recycle, surplus water & treated water)
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Operation
• Start up on June 1st• System runs in auto according to demand (level
in reservoir)• Top up chlorine tank weekly• Top up sodium carbonate tank every 3 weeks• to date chemical clean (mild citric acid) on
membranes completed every 2-3 weeks; chlorine flush once every 2-3 weeks
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Water Quality
• Turbidity (on-line): 0.02-0.03 NTU• Chlorine demand: dropped by approx.
55%• Colour: <3 TCU• TOC: 1.0*• THM: 30-35 microg/l*• Iron: 0.01 mg/l*
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Membrane System Performance
0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
80.0
0 20 40 60 80 100 1200
0.5
1
1.5
2
2.5
3
3.5
4
Average Pressure (bar)
Capacity (m3/hr)
Capacity
Pressure
Temperature (deg C)
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Temperature Corrected Capacity
0.00
1.00
2.00
3.00
4.00
5.00
6.00
7.00
8.00
9.00
10.00
m3/hr/bar
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Capital & Operating Costs
• Capital equipment $1.2m• Projected operating costs:
• approx. $50,000 a year• $0.10 per m3 of treated water• $0.027 per 1000 usgallons of treated water
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Environmental Impact
• No wastewater treatment needed
• 10 to 25% of extracted water returned unused to source with no chemicals added
• Membrane washwater and sand filter backwash - low volume, non toxic, meets surface water discharge standards in Newfoundland when bled out with unused water
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The Fyne Process
• Barrier to pathogens and viruses
• Disinfection By Products (THMs & HAAs) removed to well below recommended safe levels
• No Chemical Hazards