Coagulation-flocculation
Water treatment
Wastewater treatment
Neutralisation
No, it is not recommendable
The pH varies and depends strongly on the coagulant used and the quality of the water to be treated
There is no general rule for this reason that the Jar Test tests are strongly recommended
Dear Dr. Nabeel Hameed Al-Saati,
I think with the adding various coagulants, it may be affected on pH of wastewater treated. you can report your results as the type of used coagulant, pH of wastewater before and after treatment, and the amount of coagulant. However, you could be studied the results of previous researchers or continue your experiments at pH 6-8 to recommend optimum amount of coagulant which is caused to obtain maximum removal.
I strongly suggest you that use the Design Expert software with CCD analysis to achieve the maximum percentage of removal at neutral pH, the various amount of coagulants and different concentration of pollutants for next experiments.
Regards
Thanks a lot dear colleagues . As I expected logically. You strengthened my confidence.
I think you should stress something about the coagulant and the treated wastewater.In the pH of 3-4(initial pH when not add coagulant),can produce considerable flocs?and you shuold also take the buffer capacity of the real wastewater into account.
Dear Yonghai Gan, why do you seek those boundary conditions? My question is related to unusual pH range for the clarified water/ wastewater after coagulation-Flocculation. Let me put it in this way: Can we supply water after clarification with a pH range (3-4)? Or can we dispose a wastewater to the receiving water body with this pH range? Without neutralisation?
Does the pH change with the volume treated? think about that too. But I think for pH 3-4 to recommend it no. But check bigger volumes and lower dose.
pH 3-4 is pretty strongly acidic. If the wastewater already has that pH, then such a coagulant would be excellent for that wastewater. Following the coagulation and clarification steps, the resultant effluent would need to be neutralized to around pH 7 prior to discharge to any natural receiving water (river, lake, ocean). It would never make sense to acidify a wastewater just to be able to use such a coagulant.
Dear Floyd Mitchell, a residential ( Municipal) wastewater could never reach this pH range .it is always neutral. Likewise is the raw river water entering water treatment plants. The only probable case is the industrial wastewater and this is a very rare case.But what I meant in my question is that the coagulant optimum pH range is (3-4).and this is a very complicated recommendation as it requires neutralization at the final step.
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