giancarlo@ymee.us
First, you just missed to state about your current treatment system for my evaluation ..will be glad if you can share to me,
1. High level of lead due to outdated piping... pvc pipes will do
2. High in aluminum .... you might have used high level of alum containing coagulants. you can replaced it with flocculants- just determine if your waste is cationic or anionic for a specific flocculant to be used
3. Pesticide infiltration....a more serious issue, there are hundreds of pesticide chemical and some are of smaller molecules where it becomes difficult to filter. I suggest to escalate this with the brazilian authorites to at least minimize the release of pesticide wastes.For now, I suggest that you should go back to item#2. It should coagulate is some degrees of ionic flocculants
feel free to contact me. Thank you