Performance of bioaugmented nitrogen removal by aerobic denitrfication consortium for treating the domestic sewage at low temperatures

Abstract:

Low temperature inhibits the performance of nitrogen removal efficiency during the biological treatment of municipal wastewater. Therefore, the effluent could hardly meet the emission standard. To enhance the performance of nitrogen removal at low temperature, a psychrotolerant aerobic denitrification consortium by fast enrichment and domestication was obtained, which could remove the ammonia, nitrate and organic matter simultaneously and efficiently in aeration environment under 10 ℃. The results showed that the removal efficiency of ammonium and total nitrogen by bioaugmentation was improved by 10.31％-16.89％ and 25.07％-32.44％, respectively. It made the effluent quality meet the grade1A level of national discharge standard. After bioaugmentation terminating for 10 days, the remained consortium could still improve the reactor that the effluent of ammonium, nitrate, total nitrogen and CODCrconcentrations was decreased about 2.3,3.7,6.02 and 3.63 mg／L, respectively. The results indicated that bioaugmentation performed well and persistently.