Study on Catalytic Degradation of Oilfield Wastewater Containing Polymer by Non-equilibrium Plasma and AC/Mn + TiO

The polymer flooding tertiary oil recovery technology also produces a large amount of polymer-containing produced water while improving oilfield recovery. The direct discharge of polymer-containing produced water without treatment will cause great damage to the ecological environment. Therefore, the efficient degradation of polymer-containing wastewater has become a research hotspot. In this paper, the degradation of polyacrylamide (PAM) solution by AC/Mn + TiO photocatalyst was generated by dielectric barrier discharge (DBD), and the degradation of PAM solution by different PAM solution concentrations, different discharge voltages, and different numbers of AC/Mn + TiO particles was studied. At the same time, the morphologies of PAM before and after DBD reaction were obtained by environmental electron microscope scanner (ESEM), and AC/Mn + TiO was characterized by ESEM and EDS. The results showed that the soluble degradation rate of DBD to polyacrylamide with a concentration of 1000 mg/L was 74%, while that of 5000 mg/L polyacrylamide was only 53%. The degradation rate of PAM solution was improved by 88%, and the nitrogen oxides generated by DBD reaction can rapidly decrease the pH of PAM solution within 30 min; when the discharge was about 180 min, the PAM molecular chain was obviously broken and gradually mineralized to form water and other inorganic substance thing.