Flocculants Use and dosage :
The flocculants must be completely dissolved before use.
● For products in solid form : after good dispersion of each grain separately in the water, agitation for approximately one hour is necessary for reaching maturation.
The agitation should be sufficient to maintain the product in suspension, but not too fast thereby avoiding the mechanical degradation of the polymer.
After maturation, a uniform, viscous solution should be obtained.
● For emulsions : violent agitation is necessary when the emulsion comes into contact with the water.
Maturation is quicker and the solution can be used immediately, however an aging time of some 10 minutes is preferable.
● For liquids : an in-line dilution with a static mixer is sufficient.
We recommend active material concentrations of 1 g/l for the anionic flocculants and 3 g/l for the cationic flocculants.
A post-dilution is then often set up to facilitate the mixing of the flocculant and the solution to be treated, by reduction of the concentration and therefore of the viscosity of the flocculant solution.
Notes :
- The solutions, even diluted, are extremely viscous. The viscosity of a flocculant solution is mainly linked with its molecular weight.
- Polymers are sensitive to mechanical degradation (agitation).
- The grains tend to agglomerate if they are not correctly dispersed.
- These products spread over damp surface are extremely slippery.
- The dissolution speed of powders is affected by:
ionicity, particle size, concentration, water temperature.
- Dissolution time for non-ionic powder flocculants may reach 4 hours.
- The solutions of cationic flocculant are not very stable over time (hydrolysis phenomenon) due to the hardness of the water and a fresh solution should be prepared each day with a control of the solution’s pH.
A pH lower than 5.5 is recommended. All flocculant solutions are sensitive to Fe2+.
Keywords:
water treatment, wastewater treatment, water treatment chemical,Water purifier, water purifying
PAC, polyaluminum chloride, polyDADMAC, cationic polymer coagulant, cationic polymer flocculant, coagulant, flocculant, Polyelectrolyte,
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