Flocon 885. Biodegradable Antiscalant for Reverse Osmosis

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1 Flocon 885 Biodegradable Antiscalant for Reverse Osmosis

2 Flocon 885 General information Flocon 885 isa unique, biodegradable& Phosphorusfree 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

3 Regulatory& Biodegradation Information Flocon 885 iscertifiedtonsf/ansi Standard 60 foruse 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

4 Laboratory& PilotTests

5 Calcium Carbonate Test Calcium 250 ppm as Ca 2+ Chloride ppm as Cl - Sodium ppm as Na + Carbonate 396 ppm as CO 2-3 ph Temperature 40 o C Duration Additive dose level 3h 10 ppm (as product) LSI > +4 SDSI > +4 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.

6 Inhibition of calcium carbonate with Flocon % Inhibition Dose level (ppm) NB: For reference, 10 ppm of Flocon 190 (phosphonate) gives 38% inhibition in this severe test

7 Calcium 4500 ppm as Ca 2+ Sulfate ppm as SO 4 2- Sodium ppm as Na + Chloride ppm as Cl - Magnesium 1611 ppm as Mg 2+ ph 8.1 Temperature Duration 40 o C 3h Calcium 4500 ppm as Ca 2+ Sulfate ppm as SO 4 2- 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

8 Inhibition of calcium sulfate with Flocon % Inhibition Dose level (ppm) NB: For reference, 15 ppm of Flocon 190 (phosphonate) gives 8% inhibition in this test

9 RO Pilot Plant Tests

10 Membranes Membranes Schematic of RO Pilot Plant Membranes Reject line Feed line P in P out Permeate line Feed flowmeter Permeate flowmeter Reject flowmeter Feed Tank High pressure pump Low pressure pump

11 Seawater Chemistry Calcium 450 ppm Magnesium 1250 ppm Total Alkalinity 150 ppm TDS ppm ph 8.6

12 Operating Conditions Feed Flow 1 m 3 /h Recovery 35% Pressure 51 barg Permeate Flow 0.36 m 3 /h Membranes Filmtec SW (2.5x40 inch) Temperature 30 o C Duration 312h SDSI(Concentrate) 1.53 Flocon 885 dosed into the feed at 1 ppm

13 Seawater Test Percent Recovery (Flows) 50 Recovery (%) Time (h)

14 SeawaterTest Ca & Mg concentration in feed & reject Ca/Mg concentration (ppm) Time (h) Ca 2+ feed Ca 2+ reject Mg 2+ feed Mg 2+ reject

15 Cleaning procedure 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

16 Deposition rate on the membrane Calcium (mg/h) Magnesium (mg/h) % Inhibition of CaCO 3 % Inhibition of Mg(OH) 2 Blank Flocon 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

17 Brackish Water Chemistry Calcium 61 ppm Magnesium 20 ppm Total Alkalinity 171 ppm TDS 1761 ppm ph 8.06

18 Operating Conditions Feed Flow 1 m 3 /h Recovery 80% Pressure 56 barg Permeate Flow 0.8 m 3 /h Membranes Filmtec SW (2.5x40 inch) Temperature 30 o C Duration 312h LSI/SDSI(Concentrate) 2.4/2.24 Flocon 885 dosed into the feed at 2 ppm

19 Brackish Water Test Percent Recovery (Flow Rates) Recovery (%) Time (h)

20 Ca/Mg concentration (ppm) Brackish Water Test Ca & Mg Concentrationin thefeed & reject Ca2+ conc. tank, ppm Time (h) Mg2+ conc. reject, ppm Ca 2+ feed Ca 2+ reject Mg 2+ feed Mg 2+ reject

21 Deposition rate on the membrane Calcium (mg/h) Magnesium (mg/h) % Inhibition of CaCO 3 % Inhibition of Mg(OH) 2 Blank Flocon 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

22 Performance profile of Flocon 885 CaCO3 (LSI or SDI = 1.65 / 1.75) % Phosphorus free realtive to P CaCO3 (LSI or SDI = >+4) 0 Biodegradability (OECD 306 test) Flocon 885 Phosphonate CaSO4 (SI = 6.6)

23 Summary Antiscalant propertiesof Flocon 885 Excellent Calcium Carbonate inhibitor Excellent Barium Sulfate inhibitor Excellent Magnesium Hydroxide inhibitor Good Calcium& Strontium Sulfate inhibitor Good Calcium Fluoride inhibitor

24 CONCLUSIONS Flocon 885 isa highperformance antiscalant Good Biodegradation Profile Phosphorus& Nitrogen free Neutralised for ease of handling& transportation NSF certifiedforpotable wateruse at 10 ppm Compatible with membranes