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Hemoglobin (Hb) is a crucial molecule in the human body, consisting of four polypeptide chains, each bound to an iron-containing heme group. This unique structure enables hemoglobin to bind to oxygen, with each molecule capable of combining with four molecules of oxygen, leading to rapid and reversible oxygen loading. When fully loaded with oxygen, it is called oxyhemoglobin, while hemoglobin that has released oxygen is called reduced hemoglobin or deoxyhemoglobin. As hemoglobin binds oxygen,...
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Oxygen therapy is a pivotal aspect of medical care, particularly for patients with respiratory ailments. Two prominent oxygen-delivering systems include the Venturi mask and the transtracheal oxygen catheter.
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Fabrication and Operation of an Oxygen Insert for Adherent Cellular Cultures
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Increasing oxygen transfer efficiency through sorption enhancing strategies.

Manel Garrido-Baserba1, Diego Rosso1, Victory Odize2

  • 1Department of Civil and Environmental Engineering, University of California, 5200 Engineering Hall, Irvine, CA, 92697, USA; Water-Energy Nexus Center, University of California, Irvine, 5200 Engineering Hall, CA, 92697, USA.

Water Research
|July 17, 2020
PubMed
Summary
This summary is machine-generated.

This study links aeration efficiency and biosorption in wastewater treatment, finding that strategies like bioaugmentation significantly improve oxygen transfer and surfactant removal. Enhanced biosorption boosts efficiency in water resource recovery facilities.

Keywords:
Activated sludgeAeration efficiencyAnaerobic selectorBioaugmentationContact stabilizationSurface active agents (SAA)Surfactants

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Area of Science:

  • Environmental Engineering
  • Water Treatment Technologies
  • Biotechnology

Background:

  • Aeration efficiency is crucial for wastewater treatment, but inhibitors like surfactants can reduce its effectiveness.
  • Biosorption capacity is key to removing contaminants, yet its link to aeration efficiency requires further investigation.
  • Water resource recovery facilities (WRRFs) seek strategies to optimize treatment processes and reduce energy consumption.

Purpose of the Study:

  • To investigate the relationship between aeration efficiency and biosorption capacity in WRRFs.
  • To identify and evaluate strategies for maximizing biosorption of oxygen transfer inhibitors.
  • To assess the impact of bioaugmentation on aeration efficiency and contaminant removal over a five-year period.

Main Methods:

  • Bench-scale experiments to determine inhibition coefficients (Ki) for surfactants and colloidal fractions.
  • Pilot batch-scale and full-scale studies to examine biosorption of inhibitors.
  • Evaluation of contact stabilization and anaerobic selector configurations for enhancing biosorption.
  • Measurement of oxygen transfer efficiencies (αSOTE) and surfactant removal rates.

Main Results:

  • Inhibition constants (Ki) were determined for surfactants (2.4 ± 0.4 mg L⁻¹ SDS) and colloidal material (14 ± 1 mg L⁻¹).
  • Enhanced biosorption strategies improved αSOTE by 46% and 54% compared to conventional High Rate Activated Sludge (HRAS).
  • Surfactant removal increased by 27% and 56% with optimized enhancing-sorption strategies.

Conclusions:

  • Optimized biosorption strategies significantly enhance aeration efficiency (αSOTE) and surfactant removal in WRRFs.
  • Bioaugmentation and specific configurations like contact stabilization and anaerobic selectors are effective in improving treatment performance.
  • These findings support the advancement of WRRFs towards energy-positive operations by maximizing sorption potential and aeration efficiency.