Please tell me what solution do you recommend to remove MDEA(C5H13NO2) from the wastewater to reduce COD very much
MDEA(C5H13NO2) is used for the gas sweetening process and is a type of amine
Considering that ozone gas breaks macromolecules, molecules with aromatic rings, and finally, produce By- compounds.
Therefore, these compounds increase the amount of soluble COD.
And the ozonation process should continue until all these side compounds are mineralized.
Ali Gholamian , If you observed increased COD after partial ozonation I propose the the reason is the first ozonation product formed from MDEA likely is the amide oxide. The significance of this is that chromic acid will oxidise an amine to ammonium, but but amine oxide will become nitrate. This result in MDEA oxide requires 1.75 O2 more than MDEA to be fully oxidised in the COD analysis.
Henrik Rasmus Andersen Thanks a lot. So I add 1.75 more ozone and see what results I get
Ali Gholamian. It is a bit more complicated. MDEA oxidation in the COD analysis would be: 4 C5H13NO2+26 O2 -> 4 NH4+ + 20 CO2 + ..
MDEA-O oxidation in the COD analysis would be: 4 C5H13NO3+34 O2 -> 4 NO3- + 20 CO2 + ..
The ozone demand for complete oxidation of MDEA would be: 4 C5H13NO2+78 O3 -> 4 NH4+ + 20 CO2 + 50 O2 + ..
You mention about MDEA wastewater. Did you remove suspend particles before ozonation? If not, other possibility is that ozone brakes the organic particles to dissolved organic, leading to higer COD.
We obtained an analogous effect when ozonating the effluent from car washes. The raw wastewater was pre-treated with PIX-18 coagulation, and the level of suspended solids was negligible. Mercury compounds were used in the determination method to eliminate the effect of chlorides on the COD increase.
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