Field Testing Study on Upgradation In Situ of the Wastewater of Viscous Oil

The B/C value of wastewater of viscous oil in the Second Factory of Henan Oilfield was only 0.04,so it was difficult to be biodegraded.GC-MS Analysis was conducted in the laboratory,and the results showed that the organic pollutants were mainly alkane materials.According to the characteristics of organic pollutants and the lower B/C value,two strains of high-efficient hydrocarbon degradation bacteria and two strains of surfactant-resistant bacteria were screened.After bacteria addition and biofilm culturing were conducted in the anaerobic unit of the existing biochemical treatment device,the COD removal rate of anaerobic unit was up to about 35%,the COD removal rate of aerobic unit was up to about 30%,the total COD removal rate was 60%,and the COD of effluent was stably below 120 mg·L-1.