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Related Experiment Video

Updated: May 2, 2026

Development of Sulfidogenic Sludge from Marine Sediments and Trichloroethylene Reduction in an Upflow Anaerobic Sludge Blanket Reactor
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Sludge reduction and performance analysis of a modified sludge reduction process.

Zhen Zhou1, Weimin Qiao1, Can Xing1

  • 1College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|March 14, 2014
PubMed
Summary
This summary is machine-generated.

A new wastewater treatment, sludge process reduction activated sludge (SPRAS), significantly cuts sludge production by 76.6%. This advanced system also enhances effluent quality and pollutant removal compared to traditional methods.

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Area of Science:

  • Environmental Engineering
  • Wastewater Treatment Technologies
  • Microbial Ecology

Background:

  • Activated sludge processes are widely used but generate significant excess sludge.
  • Minimizing sludge production is crucial for sustainable wastewater treatment.
  • Existing methods like the anaerobic/anoxic/aerobic (AAO) process have limitations in sludge reduction.

Purpose of the Study:

  • To develop and evaluate a modified activated sludge process for reduced sludge production.
  • To investigate the impact of a novel sludge process reduction (SPR) module on sludge yield.
  • To compare the performance of the SPRAS system with the conventional AAO process.

Main Methods:

  • Introduction of a sludge process reduction (SPR) module (aeration tank and settler) before the activated sludge system.
  • Long-term operational monitoring (217 days) of the SPRAS system.
  • Analysis of sludge production, oxidation-reduction potential (ORP), pH, and effluent quality parameters (COD, SS, ammonium nitrogen, total nitrogen).

Main Results:

  • SPRAS technology reduced sludge production by 76.6% compared to the AAO process.
  • Extended solids retention time (approx. 121.5 days) in the SPR module promoted sludge decay.
  • Decreased ORP and pH in the SPR settler favored sludge reduction.
  • Improved removal efficiencies for suspended solids, chemical oxygen demand, and ammonium nitrogen.
  • Total nitrogen concentration in the effluent was reduced by 50%.

Conclusions:

  • The SPRAS process offers a significant reduction in excess sludge production.
  • The integrated SPR module enhances overall wastewater treatment efficiency and effluent quality.
  • SPRAS technology presents a more sustainable and cost-effective alternative to conventional AAO processes.