Biodegradable Antiscalant for Reverse Osmosis - Dormeco · 2013-01-07 · Regulatory&...
Transcript of Biodegradable Antiscalant for Reverse Osmosis - Dormeco · 2013-01-07 · Regulatory&...
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Flocon®885
Biodegradable Antiscalant
for Reverse Osmosis
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Flocon® 885 – General information
• Flocon® 885 is a unique, biodegradable & Phosphorus free antiscalant
for Reverse Osmosis systems
• Based on Polycarboxylic chemistry
• Neutralised for easy handling & transportation
• It enables RO facilities to easily comply with effluent discharge limits
& offers an environmentally friendly treatment solution for the
elimination of a range of inorganic fouling problems
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Regulatory & Biodegradation Information
• Flocon® 885 is certified to NSF/ANSI Standard 60 for use in reverse osmosis
systems producing potable water
• Studies commissioned by BWA demonstrate that Flocon® 885 is readily
biodegradable in salt water conditions & inherently biodegradable in fresh
water conditions
• Overall it can be concluded from testing performed with Flocon® 885 that its
probable environmental fate involves adsorption onto particulate matter
followed by degradation to non-toxic metabolites, with no bioaccumulation
in food chains, nor any toxic effect to aquatic species
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Laboratory &
Pilot Tests
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Calcium 250 ppm as Ca2+
Chloride 16589 ppm as Cl-
Sodium 10775 ppm as Na+
Carbonate 396 ppm as CO32-
pH 10.75
Temperature 40oC
Duration 3h
Additive dose level 10 ppm (as product)
LSI > +4
SDSI > +4
Calcium Carbonate Test
Measure the amount of soluble calcium ions remaining at the end of the test.
The higher the level maintained the better the inhibition of calcium carbonate.
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0
20
40
60
80
100
5 10 15 20 25
% I
nh
ibit
ion
Dose level (ppm)
Inhibition of calcium carbonate with Flocon 885
NB: For reference, 10 ppm of Flocon 190 (phosphonate)
gives 38% inhibition in this severe test
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Calcium 4500 ppm as Ca2+
Sulfate 10800 ppm as SO42-
Sodium 12677 ppm as Na+
Chloride 324246 ppm as Cl-
Magnesium 1611 ppm as Mg2+
pH 8.1
Temperature 40oC
Duration 3h
Calcium 4500 ppm as Ca2+
Sulfate 10800 ppm as SO42-
Calcium sulfate SI 6.6
Calcium Sulfate Test
Measure the amount of soluble calcium ions remaining at the end of the test.
The higher the level maintained the better the inhibition of calcium sulfate
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0
20
40
60
80
100
0 5 10 15 20
% I
nh
ibit
ion
Dose level (ppm)
Inhibition of calcium sulfate with Flocon 885
NB: For reference, 15 ppm of Flocon 190 (phosphonate)
gives 8% inhibition in this test
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RO Pilot Plant Tests
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Schematic of RO Pilot Plant
Pin Pout
Permeate
flowmeter
Reject
flowmeter
Feed Tank
Low pressure
pump
High pressure
pump
Feed line
Membranes
Reject
line
Permeate
line
Feed flowmeter
Membranes
Membranes
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Seawater Chemistry
Calcium 450 ppm
Magnesium 1250 ppm
Total Alkalinity 150 ppm
TDS 29400 ppm
pH 8.6
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Operating Conditions
Feed Flow 1 m3/h
Recovery 35%
Pressure 51 barg
Permeate Flow 0.36 m3/h
Membranes Filmtec SW (2.5x40 inch)
Temperature 30oC
Duration 312h
SDSI (Concentrate) 1.53
Flocon 885 dosed into the feed at 1 ppm
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0
10
20
30
40
50
0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320
Re
cove
ry (
%)
Time (h)
Seawater Test Percent Recovery (Flows)
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400
600
800
1000
1200
1400
1600
1800
2000
0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320Ca
/Mg
co
nce
ntr
ati
on
(pp
m)
Time (h)
Seawater Test Ca & Mg concentration in feed & reject
Mg2+ rejectCa2+ rejectCa2+ feed Mg2+ feed
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• Cleaning – circulation of citric acid (5%)
• Determine deposition rate from the
concentration of calcium & magnesium in
the cleaning solution at the end of the test
Cleaning procedure
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Calcium
(mg/h)
Magnesium
(mg/h)
%
Inhibition
of CaCO3
%
Inhibition of
Mg(OH)2
Blank 44.1 3.4 - -
Flocon 885 0.55 0 98.8 100
This test demonstrates that 1 ppm of Flocon 885 in the feed can effectively control
the deposition of calcium carbonate & magnesium hydroxide at SDSI of 1.53
Deposition rate on the membrane
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Brackish Water Chemistry
Calcium 61 ppm
Magnesium 20 ppm
Total Alkalinity 171 ppm
TDS 1761 ppm
pH 8.06
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Operating Conditions
Feed Flow 1 m3/h
Recovery 80%
Pressure 56 barg
Permeate Flow 0.8 m3/h
Membranes Filmtec SW (2.5x40 inch)
Temperature 30oC
Duration 312h
LSI/SDSI (Concentrate) 2.4/2.24
Flocon 885 dosed into the feed at 2 ppm
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50
60
70
80
90
100
0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320
Re
cove
ry (
%)
Time (h)
Brackish Water Test Percent Recovery (Flow Rates)
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0
50
100
150
200
250
300
350
0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320Ca
/Mg
co
nce
ntr
ati
on
(pp
m)
Time (h)
Brackish Water TestCa & Mg Concentration in the feed & reject
Ca2+ conc. tank, ppm Mg2+ conc. reject, ppm
Mg2+ feed Mg2+ rejectCa2+ rejectCa2+ feed
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Calcium
(mg/h)
Magnesium
(mg/h)
%
Inhibition
of CaCO3
%
Inhibition of
Mg(OH)2
Blank 15.4 0 - -
Flocon 885 0.68 0 95.6 100
Deposition rate on the membrane
This test demonstrates that 2 ppm of Flocon 885 in the feed can effectively control
the deposition of calcium carbonate & magnesium hydroxide at SDSI of 2.24
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Performance profile of Flocon® 885
0
20
40
60
80
100
CaCO3 (LSI or SDI = 1.65
/ 1.75)
CaCO3 (LSI or SDI = >+4)
CaSO4 (SI = 6.6)Biodegradability (OECD
306 test)
% Phosphorus free
realtive to P191
Flocon 885 Phosphonate
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• Excellent Calcium Carbonate inhibitor
• Excellent Barium Sulfate inhibitor
• Excellent Magnesium Hydroxide inhibitor
• Good Calcium & Strontium Sulfate inhibitor
• Good Calcium Fluoride inhibitor
Summary – Antiscalant properties of Flocon® 885
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CONCLUSIONS
• Flocon® 885 is a high performance antiscalant
•Good Biodegradation Profile
• Phosphorus & Nitrogen free
• Neutralised for ease of handling & transportation
• NSF certified for potable water use at 10 ppm
• Compatible with membranes