CHEN Yan-jie,FU Guo-kai,LI Xuan,et al.Treatment of Low Concentration Polluted Surface Water by Rotating Biological Contactor at Low Temperature[J].China Water & Wastewater,2021,37(3 3):85-1.
Treatment of Low Concentration Polluted Surface Water by Rotating Biological Contactor at Low Temperature
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
3 3
Page:
85-1
Column:
Date of publication:
2021-02-01
- Keywords:
- rotating biological contactor (RBC); start-up at low temperature; low concentration polluted surface water; pollutant reduction; microbial community composition
- Abstract:
- In order to quickly start rotating biological contactor (RBC) to treat low concentration polluted surface water at low temperature between 8 ℃ and 15 ℃ in winter, biofilm was successfully attached on the media through three methods, namely natural cultivation (G1), cultivation by inoculating activated sludge (G2) and cultivation by inoculating nitrifier (G3), respectively, and the effluent quality, morphology of the biofilm and microbial community were compared. In term of starting time and anti-shock load capacity, G3 was better than G2, and G2 was superior to G1. After 25 days, the removal rate of ammonium nitrogen could reach 88.78% in G3 system inoculated with nitrifier. During stable operation, similar treatment performance of surface water was obtained in G1, G2 and G3 systems, and the removal rates of NH4+-N and COD could be stabilized at 90% and 20%, respectively. Microbial abundance and species of G1, G2 and G3 systems were similar to each other. Nitrosospira, Candidatus nitrotoga, and Nitrosomonas were the main nitrifiers, and the relative abundance of nitrifiers in G1, G2 and G3 systems were 15.85%, 12.04% and 12.47%, respectively. Reyranella, Thermomonas, Polymorphobacter, Sphingomonas and Arenimonas were responsible for degradation of COD, and the relative abundances were 10.69%, 12.39% and 15.02% in G1, G2 and G3 systems, respectively. The back-end disks of the rotating biological contactor exhibited higher microbial uniformity and richer diversity than those in the front disks of the rotating biological contactor, indicating that the species and uniformity of the microbial community were related to the type and concentration of pollutants.
Last Update:
2021-02-01