Treatment of wastewater containing methylpyrrolidone

Its biochemical stability is not very good; it belongs to the heterocyclic category. Many heterocyclic compounds have poor biochemical stability, and conventional methods cannot completely treat such wastewater. When the COD level drops to a certain extent, the presence of these substances in the wastewater prevents further reduction of its concentration, making it difficult to meet the discharge standards. Are there other substances such as methamine present in the wastewater? This should be carefully considered

Thank you. Where can I find the biochemical data for such substances?

Biochemical degradation is the main method used to determine whether biological bacteria can be employed for treatment. This is generally assessed through the BOD/COD ratio; if this value is greater than 0.25, the issue can be resolved through biochemical methods. When the value lies between 0.2 and 0.25, it is necessary to use trained bacterial strains to address the problem. Therefore, the B/C ratio becomes one of the key indicators for determining biogradability. (Of course, there are times when false readings occur, but that’s another matter.) Companies can usually carry out tests for BOD and COD on their own or by having other departments do it. Last edited by fhjq on 2007-12-6 09:02

You can try using macroporous adsorption resins, which have excellent adsorption properties for benzene rings and benzene-like heterocyclic organic compounds.

I’ll post it back on exchangeresin. Thank you for your guidance! By the way, how is desorption achieved from macroporous adsorption resin after adsorption? And how can secondary pollution be avoided?

After saturation with adsorption, desorption can be carried out using an organic solvent suitable for your product. The desorbed liquid can then be separated through processes such as distillation to recover the active ingredients.

Thank you very much for posting on exchangeresin; however, it might still be a bit difficult to use in practice

Hello, OP. If this wastewater is subjected to biochemical treatment directly, there are still significant risks; based on the analysis of its molecular structure, it belongs to heterocyclic compounds that are difficult to treat through biochemical methods, with the primary functional groups being thio groups. It is recommended that the poster first employ advanced oxidation treatment, using the overpotential electrolysis method; for biochemical treatments, hydrolysis combined with secondary biochemical processes should be adopted. Generally, the salt content in such wastewater is not low, and it must be taken into account. At the same time, the main inorganic components of your wastewater are unknown; if sulfates are present in large quantities, then when anaerobic treatment cannot be carried out completely, care must be taken during the hydrolysis process to ensure that it does not last too long. Reference.

Reply to ipgood and post it; thank you very much! We will give proper consideration to your suggestion!

I’ve seen some information suggesting that the stripping method could be used; I’m not sure if I’m remembering incorrectly.