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Achieving stable and efficient single-stage deammonification using plug flow reactor.

Zhengyang Peng1, Dawen Gao2, Tao Xiang1

  • 1State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China.

Environmental Science and Pollution Research International
|July 29, 2019
PubMed
Summary
This summary is machine-generated.

Stable deammonification was achieved in a plug flow fixed biofilm reactor for wastewater treatment. This system demonstrated high ammonium and total nitrogen removal, with suppressed nitrite-oxidizing bacteria (NOB) in the initial stages.

Keywords:
DeammonificationDomestic sewageFixed biofilmHigh-throughput sequencingNOB suppressionPlug flow

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Area of Science:

  • Environmental Engineering
  • Microbiology
  • Wastewater Treatment Technologies

Background:

  • Deammonification is a promising wastewater treatment technology.
  • Achieving stable deammonification, particularly in plug flow systems, remains a challenge for domestic sewage treatment.

Purpose of the Study:

  • To investigate the stability and performance of deammonification in a plug flow fixed biofilm reactor.
  • To assess the removal efficiencies and microbial community dynamics under low-strength synthetic wastewater conditions.

Main Methods:

  • A plug flow fixed biofilm reactor was established and operated with synthetic low-strength wastewater.
  • Ammonium and total nitrogen removal efficiencies were monitored.
  • Nitrate production ratio and microbial community composition (anammox bacteria and NOB) were analyzed at different sampling points.

Main Results:

  • The reactor achieved an average ammonium removal efficiency of 90.0 ± 10.0% and total nitrogen removal efficiency of 79.4 ± 9.3%.
  • Superior nitrate production ratio (∆Nitrate/∆Ammonium) of 9.5 ± 3.4% was observed.
  • Candidatus Jettenia was the predominant anammox bacteria, dominating in most sampling points, while the relative abundance of NOB increased along the reactor.

Conclusions:

  • The plug flow system demonstrated stable deammonification performance for low-strength wastewater.
  • Higher residual ammonium concentrations at the reactor's front effectively suppressed NOB, with this suppression weakening along the reactor.