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Achieving stable mainstream deammonification process by a novel combinatorial control strategy.

Yuqi Li1, Tao Xiang1, Hong Liang2

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

Bioresource Technology
|November 2, 2020
PubMed
Summary
This summary is machine-generated.

A novel control strategy ensures stable mainstream deammonification, achieving high nitrogen removal efficiency. This process effectively treats municipal sewage by combining deammonification with heterotrophic denitrification.

Keywords:
Mainstream deammonificationMunicipal sewageNitrogen removalNovel combinatorial control strategy

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Area of Science:

  • Environmental Engineering
  • Wastewater Treatment Technologies
  • Biotechnology

Background:

  • Mainstream deammonification is crucial for efficient nitrogen removal in wastewater treatment.
  • Achieving stability in deammonification processes under varying conditions remains a challenge.

Purpose of the Study:

  • To develop and validate a novel combinatorial control strategy for stable mainstream deammonification.
  • To assess the nitrogen removal efficiency and rate using this strategy in upflow double-blanket filter reactors.

Main Methods:

  • Implementation of a three-step control strategy: upflow air-water washing, short-term increased nitrogen loading rate (NLR), and low oxygen supply.
  • Utilizing two upflow double-blanket filter (UDBF) reactors to perform the deammonification process.
  • Statistical analysis to identify key factors influencing nitrogen removal pathways.

Main Results:

  • Achieved high nitrogen removal efficiencies (NRE) of 84.5 ± 2.2% and 84.6 ± 1.6%.
  • Demonstrated significant nitrogen removal rates (NRR) of 123.8 ± 2.9 and 125.5 ± 6.2 g N·(m³·d)⁻¹.
  • Identified temperature and C/N ratio as critical factors affecting nitrogen removal pathways, explaining over 78% of heterotrophic denitrification contribution.

Conclusions:

  • The developed combinatorial control strategy effectively guarantees a stable mainstream deammonification process.
  • Deammonification significantly contributes to total nitrogen removal, working synergistically with heterotrophic denitrification for efficient municipal sewage treatment.