Adjustment of cosmetic wastewater

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Dear seniors and teachers, I’ve just started working in the field of wastewater treatment, so there’s still a lot I don’t understand. I have some basic questions and would like to seek advice from those with more experience. One question is regarding how to handle the scum produced by the flotation machine. Is it also necessary to determine the appropriate dosage of PAC and PAM through beaker experiments? Additionally, the micro-pore release device is installed on the pipeline leading to the contact chamber of the flotation machine, rather than inside the contact chamber itself; will this result in it being ineffective? ； Secondly, is it possible that the Fe(OH)3 flocs will float on the surface of the sedimentation tank? I placed the water obtained through electrocoagulation in a beaker and added alkali to it; when the pH was adjusted to around 9, a layer of light brown floc-like substance was observed on the surface. Could this be Fe(OH)3 flocs? ； Thirdly, could the experienced colleagues advise on how to cultivate the activated sludge in biological contact oxidation tanks? Are there any books on the training of activated sludge? Also, since we are dealing with wastewater from cosmetics, can we use the activated sludge from domestic sewage treatment plants for this purpose? ； Finally, I wonder if anyone has any good methods for defoaming. Since it’s cosmetic wastewater containing many surfactants, there’s foam everywhere, and spraying water doesn’t work very well; it’s hard to know where to start. There are quite a few questions, and they’re a bit mixed up. I sincerely ask all the more experienced members to help answer them if they have time. Thank you everyone