If so, then what could be the possible reason? I am asking this question in context of a wastewater stream with COD ~ 1200 ppm and TDS close to 13000 ppm.
Thanks!
It depends upon quality of TDS, it means it is important what forms TDS and if TDS comprises oxidizable compounds.
Best regards
Vit
Dear Vit Mateju : Thanks for pointing out the vagueness of my question. I should have been more specific. My sample has inorganic TDS mostly in the form of sulphates of sodium and zinc.
In that case Fenton´s oxidation is not an optimal choice, according to my opinion.
Best regards
Vit
Vit Mateju : I asked this question based on my laboratory experimental observation on using Fenton for COD reduction which also saw a moderate TDS reduction. Hence I thought of putting this question out in the community. Thanks for your comment.
Regards
Ramendra
Yes, I agree with Vit Mateju comment "it depend on quality of TDS and if TDS comprises oxidizable compounds".
Fenton increase TDS. If COD is contributed by suspended solids, Pre-sdimentation and coagulation will be helpful to keep TDS concentration low.
Like what @nafees mentioned, TDS increases after Fenton, this is so since there would be degradation of larger contaminants to smaller ones. Also there is an addition of ferrous iron which contributes to TDS. The likely reason why your TDS actually increases is probably due to the coagulation phase post Fenton. I would assume that you adjusted the pH to precipitate out the iron. This act actually reduces the TDS due to the coagulation of compounds in wastewater with the ferric sludge. This was also observed in my thesis although not reported.
https://www.researchgate.net/publication/339385978_A_FEASIBILITY_STUDY_ON_COMBINED_FENTON-BAFBAC_SYSTEM_FOR_INDUSTRIAL_WASTEWATER_TREATMENT
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