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[Aerobic Granular Sludge System with Multiple Influent-Aeration Operation Strategy].

Jie Zhang1,2, Yu-Ying Wang1, Dong Li1

  • 1Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China.

Huan Jing Ke Xue= Huanjing Kexue
|July 2, 2020
PubMed
Summary

Multiple influent-aeration strategies enhance aerobic granular sludge formation and pollutant removal in wastewater treatment. This method improves nutrient removal and enriches key microbial communities for better overall performance.

Keywords:
aerobic granular sludge(AGS)domestic sewagemultiple influent-aeration operation strategynitrogen and phosphorus removalone influent-aeration operation strategy

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Area of Science:

  • Environmental Science
  • Microbiology
  • Environmental Engineering

Context:

  • Wastewater treatment plants (WWTPs) face challenges in efficiently removing nutrients like nitrogen and phosphorus.
  • Sequencing Batch Reactors (SBRs) are a common technology, but optimizing their operation for sludge granulation and pollutant removal is crucial.
  • Aerobic granular sludge (AGS) offers advantages in settling properties and pollutant removal efficiency compared to conventional activated sludge.

Purpose:

  • To investigate the effectiveness of single versus multiple influent-aeration strategies in SBRs for achieving sludge granulation.
  • To compare the removal efficiencies of chemical oxygen demand (COD), total nitrogen (TN), and total phosphorus (TP) under different aeration strategies.
  • To analyze the microbial community shifts, specifically the ratio of denitrifying phosphorus-accumulating organisms (DPAO) to total phosphorus-accumulating organisms (PAOs), and their impact on performance.

Summary:

  • Two SBR reactors, R1 (single influent-aeration) and R2 (multiple influent-aeration), were inoculated with activated sludge and fed domestic sewage.
  • Both reactors achieved sludge granulation, with R2 reaching granulation faster (39 days) than R1 (56 days).
  • R2 demonstrated superior effluent quality, with lower concentrations of NO3--N and TP, and higher removal rates for COD, TN, and TP compared to R1. The average particle size in R2 (791 μm) was also larger than in R1 (740 μm).
  • The multiple influent-aeration strategy in R2 led to a significant increase in the DPAO/PAO ratio (34.08%) compared to R1 (25.47%), indicating better enrichment of DPAO and improved phosphorus removal performance.

Impact:

  • The multiple influent-aeration strategy is more effective in promoting rapid sludge granulation and enhancing the removal of COD, TN, and TP in SBR systems.
  • This operational strategy supports the enrichment of DPAOs, leading to improved biological phosphorus removal efficiency.
  • Findings suggest that optimizing influent-aeration patterns can significantly improve the performance and stability of aerobic granular sludge processes in wastewater treatment.