Hello everyone,
We've started using the acidic waste from the anodization bath instead of pure 98% sulfuric acid to neutralize our wastewaters from the rincing bath of our anodization plant.
We observed that the flocculation got quite better, the floc became bigger the turbidity of the water from the reactor of flocculation decreased slightly and the sedimentation got faster in the decanter.
What I wonder about is how exactly did this came to be what reactions occured, knowing that our flocculent is anionic polyacrylamide and that our wastewaters are a blending of rincing bath from mainly etching and anodization.
Could the presence of Aluminium sulfate have stimulated the flocculation ?
I thank you all.
If aluminium sulphate was present, since it is an inorganic coagulant, then it will increase the settling rate of suspended solids and improves clarity of the resulting water. The resulting sludge will depend on the pH, for example you are more likely to form metal hydroxide sludges at pH above 8, which will include Al(OH)3. The turbidity will decrease since the suspended solids form their respective sludges.
Aluminum salts are commonly used inorganic flocculants. I understand that co-application of inorganic flocculants and polymeric flocculants (such as anionic PAM) can be very effective for flocculanting. It seems like you may have accidentally made a great process improvement!
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