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Limitation of pH on DAF operation

Limitation of pH on DAF operation

Limitation of pH on DAF operation

(OP)
What is the optimum range of pH for improving DAF efficiency & what is the maximum limitation on pH for DAF to handle safely.

I have a scenario where pH at the feed of DAF is around 10.5, will there be any effect of DAF efficiency.

Also TDS at the feed of DAF is quite high, around 25000 - 30000 ppm, please let me know the impact if any on DAF performance.

RE: Limitation of pH on DAF operation

The optimum DAF pH will be dependent on several things. Most important is the application which you have not stated. Some applications such as oil & food application need a lower pH. Another major factor is that some coagulants will only work optimally within a certain pH range.

RE: Limitation of pH on DAF operation

The process of air flotation itself is not impacted by pH. However dissolved air flotation processes normally incorporate the use of a coagulant to improve performance. As bimr suggests the coagulent and the coagulation process will have optimum pH ranges for operation. So depending on the coagulant in use if any a pH of 10.5 may or may not be okay.

The high TDS itself should not affect the DAF process substantially although the viscosity and density of the water is different to what freshh water might be be. This might have a very minor impact on bubble formation and particle rise rates, but probably not enough to be a problem.

Without knowing the chemistry of the water being treated you should also check the compatibility and performance of the coagulant in the high TDS conditions.

Regards
Ashtree
"Any water can be made potable if you filter it through enough money"

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