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Advanced nutrient removal and external sludge reduction: Demonstration in a pilot-scale sequencing batch reactor.

Shenhua Yang1,2, Haibin Chang1, Yongzhen Peng1

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Water Environment Research : a Research Publication of the Water Environment Federation
|January 23, 2023
PubMed
Summary

Adding fermented sludge products to wastewater treatment enhanced nutrient removal and reduced sludge, saving costs. This cost-effective method improved nitrogen and phosphorus removal efficiencies significantly.

Keywords:
anaerobic/oxic/anoxic processexcess sludge reductionpilot scalesludge fermentation

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Area of Science:

  • Environmental Engineering
  • Wastewater Treatment Technologies
  • Microbial Ecology

Background:

  • Improving nutrient removal in sewage treatment is crucial for environmental protection.
  • Utilizing excess sludge fermentation products offers a cost-effective approach.
  • Demonstrating the practical application of fermented sludge products in wastewater treatment is limited.

Purpose of the Study:

  • To investigate the effectiveness of adding excess sludge fermentation products to Sequencing Batch Reactors (SBRs) for enhanced nutrient removal.
  • To evaluate the impact of fermented sludge on excess sludge reduction.
  • To analyze the microbial community changes and economic feasibility of this method.

Main Methods:

  • Fermenting excess sludge for 10 days to produce fermentation products.
  • Adding fermented sludge products to SBRs at a 1:15 sewage ratio.
  • Monitoring nutrient levels, sludge reduction rates, and microbial communities using high-throughput sequencing.

Main Results:

  • Achieved a nitrite accumulation ratio of 34.7% in the SBR.
  • Reduced average effluent total nitrogen to 7.3 mg/L and phosphorus to 0.5 mg/L (86.7% and 95.5% removal efficiencies).
  • Increased excess sludge reduction ratio to 42.5% and demonstrated cost savings of $0.011/m³.

Conclusions:

  • Fermented sludge addition is an effective strategy for enhancing nutrient removal and reducing excess sludge in SBR systems.
  • Microbial community shifts, including increased endogenous denitrifiers and polyphosphate-accumulating organisms, drive treatment improvements.
  • This method presents a viable, cost-effective solution for advanced wastewater treatment.