Download - How to prevent scale and fouling in RO plants

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

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.

Plant performance can be different.

Chlorination can make a difference.

• Feed water is chlorinated

Chlorination is stopped

• Feed water quality

• System design

• Operational practices

Any Combination

CAUSE OF MEMBRANE PROBLEMS

• Chemical

• Mechanical

• Operational

Any Combination

SOLUTIONS TO MEMBRANE PROBLEMS

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


• 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

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


• 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


• 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


• Any questions?

Thank you