Experimental study on the intensive treatment of coal mine domestic sewage by biofilm A/O

Abstract

In recent years, China attached much significance to the reuse and high standard discharge of domestic sewage. Coal mines in China are mainly distributed in north and northwest t areas with shortage of water. To improve the treatment effects and reuse standard of coal mine domestic sewage, the biofilm A/O reactor with one anoxic zone and two aerobic zones was used to carry out an experiment. The pollutants removal effects and influencing factors were analyzed. The results indicate: Under the conditions of HRT=5.92 h, ρ(DO)A=0.5±0.2 mg/L, ρ(DO)O1=2±0.2 mg/L, ρ(DO)O2=2.5±0.2 mg/L, and R (reflux ration)=100%, the maximal concentration of NH4 +-N, COD, TN and TP in the last effluent were respectively 0.52mg/L, 15.3 mg/L, 13.1 mg/L and 0.78mg/L. Under the conditions of HRT=4.74 h and R=50%, the reactor achieved optimal performance. Moreover, the effluent concentration of NH4 +-N, COD, TN, TP met The reuse of urban recycling water - Water quality standard for industrial uses (GB/T 19923-2005).