How to prevent scale and fouling in RO plants
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Transcript of How to prevent scale and fouling in RO plants
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Welcome
• Dr. Jens Nähring • Combating biofouling and reducing total cost in water
treatment since 1995 • Company distributes Genesys products • Company produces membrane cleaners and
antiscalants for niche markets
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What is your biggest challenge today?
• Is it biofouling? • Is it cartridge filter exchange rate? • Is it cleaning frequency? • Please tell us NOW
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Antiscalants can be different.
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Plant performance can be different.
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Chlorination can make a difference.
• Feed water is chlorinated
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Chlorination is stopped
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• Feed water quality
• System design
• Operational practices
Any Combination
CAUSE OF MEMBRANE PROBLEMS
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• Chemical
• Mechanical
• Operational
Any Combination
SOLUTIONS TO MEMBRANE PROBLEMS
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FreeFlow 5115 Membrane antiscalant
• FreeFlow 5115 was developed to reduce the rate of biofilm formation and biofilm thickness as compared to conventional or low-fouling antiscalants: • Components non-toxic for the production of
water for human consumption. • Not a biocide, but a biostatic:
• biocide kills, whereas a biostatic aims at a steady state
Properties
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FreeFlow 5115 Membrane antiscalant
• FreeFlow 5115 is used up to LSI +2,6 to 2,8. • Excellent against calcium, barium, strontium
sulfate and calcium fluoride. • Helps to keep particles and colloides in solution. • Has a dispersing effect on
• metallic particles • CaCO3 particles.
Properties
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1) Stabilising power of FreeFlow 5115 on Iron, Manganese, Aluminium particles
2) Dosing pump failure leads to immediate increase of delta p in the cartridge filter
3) User realises anomaly in increase of delta p and repairs antiscalant dosing pump
4) Dispersing power of FreeFlow 5115 cleans cartridge filter online of metallic particle
Surface water, coagulation, Fe(III)Cl3, MMF, AS, CF, RO
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FreeFlow 5115 Membrane antiscalant
• Dosed after the media filter prior to the cartridge filters
• Dose rate typically 2 - 5 mg/l • Iron and aluminium are also stabilised
• Iron stabilisation leads to apparent algea toxicity
• The dose rate will be calculated based on
concentrate composition and water chemistry calculations of ion pairs and free ions.
In use
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FreeFlow 5115 Membrane antiscalant
• Reduces cartridge filter exchange rate. • Compatible with all membrane types. • Reduces or replaces acid addition. • Systems operate at their highest possible
recovery rate, reducing total costs.
Benefits
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FreeFlow 5115 Membrane antiscalant
• Any questions?
Thank you