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Continuously-stirred Anaerobic Digester to Convert Organic Wastes into Biogas: System Setup and Basic Operation
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SMP Production in an Anaerobic Submerged Membrane Bioreactor (AnMBR) at Different Organic Loading Rates.

Sandra C Medina1,2, Nataly Zamora-Vacca1,3, Hector J Luna1,4

  • 1Environmental Engineering Research Center (CIIA), Department of Civil and Environmental Engineering, Universidad de Los Andes, Cra. 1 #18a 12, Bogotá 111711, Colombia.

Membranes
|November 4, 2020
PubMed
Summary
This summary is machine-generated.

Soluble microbial products (SMPs) significantly contribute to biofouling in anaerobic membrane bioreactors (AnMBRs). Understanding SMPs, especially the unknown chemical oxygen demand (COD) fraction, is crucial for mitigating membrane fouling and improving wastewater treatment efficiency.

Keywords:
anaerobic membrane bioreactor (AnMBR)membrane foulingsoluble microbial products (SMPs)wastewater treatment

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Area of Science:

  • Environmental Science
  • Biotechnology
  • Chemical Engineering

Background:

  • Anaerobic membrane bioreactors (AnMBRs) are effective for domestic wastewater treatment.
  • Biofouling of membranes in AnMBRs increases operational costs and energy demand.
  • Soluble microbial products (SMPs) are a major contributor to biofouling on AnMBR membranes.

Purpose of the Study:

  • To evaluate SMP production in a submerged AnMBR under varying organic loads.
  • To investigate the role of SMPs in membrane fouling.
  • To characterize SMPs by molecular weight and chemical composition.

Main Methods:

  • Long-term operation of a 32 L submerged AnMBR at three different organic loads.
  • Sampling of permeate and sludge at various reactor heights.
  • Characterization of SMPs by molecular weight and chemical analysis (COD, carbohydrates, proteins).

Main Results:

  • Higher SMP production correlated with increased membrane fouling, particularly in phase 2.
  • AnMBR permeate showed significant removal of SMPs (56-70%).
  • SMPs exhibited bimodal molecular weight distribution with a prevalence of fractions < 1 kDa, linked to pore-blocking.
  • The unknown COD fraction dominated SMP composition over carbohydrates and proteins.

Conclusions:

  • SMPs, especially those with low molecular weight (< 1 kDa), are key drivers of AnMBR membrane fouling.
  • The predominance of unknown COD in SMPs highlights a critical area for future research.
  • Further characterization of the unknown COD fraction is essential for developing effective strategies to control membrane fouling in AnMBRs.