What is the best pH conditions to use different coagulant from FeCl3.6H2O, Al2SO4.18H2O, Fe2SO3 and AlCl3 for wastewater treatment?

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Nabeel Hameed Al-Saati

The same as for water between 6-8. Refer to the link:-

https://www.ncbi.nlm.nih.gov/m/pubmed/20188465/

Regards

Sutanto Latif

Coagulant from FeCl3.6H2O, Al2SO4.18H2O, Fe2SO3 and AlCl3, wil be hydrolysis in the water and create H+. You should make the waste water to be 8-9 before coagulant treatments