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[Operational Performance and Microbial Community Structure in a Completely Mixed Aeration System].

Shuo Wang1,2,3, Qiao Xu1,4, Guang-Sheng Zhang1,2,3

  • 1School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China.

Huan Jing Ke Xue= Huanjing Kexue
|July 3, 2018
PubMed
Summary

A novel completely mixed aeration system efficiently removes pollutants from domestic sewage, achieving high removal rates for chemical oxygen demand and nitrogen compounds. This system demonstrates superior performance and enhanced microbial activity for wastewater treatment.

Keywords:
aerobic denitrificationcompletely mixed aeration systemhigh-throughput sequencingperplasmic nitrate reductases

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Area of Science:

  • Environmental Engineering
  • Microbiology
  • Water Treatment

Background:

  • Domestic sewage treatment requires efficient removal of pollutants like chemical oxygen demand (COD) and nitrogen compounds.
  • Simultaneous nitrification and denitrification (SND) processes are crucial for effective nitrogen removal in wastewater treatment plants.
  • Understanding microbial community structure is key to optimizing biological wastewater treatment systems.

Purpose of the Study:

  • To investigate the simultaneous nitrification and denitrification (SND) process in a completely mixed aeration system for domestic sewage.
  • To analyze the microbial community structure within the developed aeration system.
  • To evaluate the system's performance against established wastewater discharge standards.

Main Methods:

  • Implementation and operation of a pilot-scale completely mixed aeration system.
  • Monitoring of key water quality parameters including chemical oxygen demand (COD), ammonium nitrogen (NH4+-N), and total nitrogen (TN).
  • Polymerase Chain Reaction (PCR) amplification to detect genes encoding perplasmic nitrate reductases, confirming aerobic denitrifying bacteria presence.
  • High-throughput sequencing for microbial community structure analysis.

Main Results:

  • The system demonstrated stable operation with high average removal efficiencies: 93.2% for COD, 96.9% for NH4+-N, and 75.2% for TN.
  • Effluent quality surpassed Level A standards of the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002) without an external carbon source.
  • Sludge exhibited a denitrification capacity 2.86 times higher than that of a conventional wastewater treatment plant.
  • Aerobic denitrifying bacteria were confirmed to be present in the system.
  • High-throughput sequencing identified *Zoogloea*, *Thauera*, and *Dechloromonas* as dominant genera.

Conclusions:

  • The completely mixed aeration system is effective for simultaneous nitrification and denitrification in domestic sewage treatment.
  • The system's efficiency in pollutant removal and enhanced denitrification capacity are attributed to its unique microbial community.
  • The findings support the potential of this system for advanced wastewater treatment applications.