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Application of phagotrophic algae in waste activated sludge conversion and stabilization.

Water environment research : a research publication of the Water Environment Federation·2021
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Membrane thickening aerobic digestion processes.

Bryen Woo1

  • 1OVIVO USA, LLC, 2404 Rutland Drive, Austin, Texas 78758 USA

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|April 11, 2014
PubMed
Summary

Membrane thickening aerobic digestion offers an efficient solution for wastewater sludge management. This process reduces costs and environmental impact by producing reusable water and stabilizing sludge effectively.

Area of Science:

  • Environmental Engineering
  • Water Treatment Technologies
  • Biotechnology

Background:

  • Sludge management constitutes ~60% of wastewater treatment costs.
  • Stringent sludge disposal regulations necessitate efficient solids handling.
  • Optimizing sludge treatment is crucial for operational and environmental compliance.

Purpose of the Study:

  • To introduce and evaluate the Membrane Thickening Aerobic Digestion (MTAD) process.
  • To highlight the advantages of integrating membrane technology with aerobic digestion.
  • To assess the MTAD process for meeting stringent nutrient discharge limits.

Main Methods:

  • Integration of controlled aerobic digestion with membrane pre-thickening of waste activated sludge.
  • Utilizing an anoxic tank, aerated membrane thickener, and two-stage digestion.

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  • Operating the membrane thickener in a loop with the first-stage digester.

    • Main Results:

    • Production of high-quality permeate with low total phosphorus and nitrogen, suitable for recycling.
    • Reliable sludge thickening to 4% solids without polymers or decanting attention.
    • Protection of biological nutrient removal processes without chemical addition.
    • Class B sludge stabilization achieved.

    Conclusions:

    • Membrane thickening aerobic digestion is a versatile process applicable to various liquid treatment sludges.
    • The MTAD process offers significant cost savings and environmental benefits.
    • It effectively meets low nutrient discharge limits and enhances sludge management efficiency.