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Laminar flow represents a smooth, orderly fluid motion where particles move along parallel paths, resulting in minimal mixing between layers. Streamlined particle paths characterize this flow regime and occur under conditions where viscous forces dominate over inertial forces. The distinction between laminar, transitional, and turbulent flow is primarily determined by the Reynolds number, a dimensionless quantity calculated as:
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In aerobic fermentations, oxygen is vital for microbial growth and metabolite production. Since air comprises only about 20% oxygen and the gas is poorly soluble in water—just 9 ppm at 20°C—supplying sufficient oxygen becomes a critical challenge, especially in high-demand processes like yeast growth or citric acid production. Even a fully saturated broth may offer only a few seconds of oxygen availability.To address this, sterile or scrubbed air is introduced into the...
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Strain improvement is a foundational strategy in industrial microbiology aimed at maximizing microbial productivity, particularly because natural isolates typically yield commercially valuable products in very low concentrations. Although optimizing the culture medium and environmental conditions can improve yields, these adjustments are inherently limited by the organism’s genetic potential. As a result, the focus shifts toward genetic modifications to enhance biosynthetic capacity. The...
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Lactic acid, an important organic acid extensively applied in food, pharmaceutical, and biodegradable polymer industries, is primarily produced via microbial fermentation. This method is favored over chemical synthesis due to its environmental sustainability and capacity for enantiomerically pure product formation. Among various microbial processes, the fermentation of starch-based substrates stands out due to the abundance and renewability of raw materials like corn and potatoes.Hydrolysis of...
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Continuously-stirred Anaerobic Digester to Convert Organic Wastes into Biogas: System Setup and Basic Operation
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Continuous flow aerobic granular sludge: recent developments and applications.

Cheng Yu1, Kaijun Wang2

  • 1State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|March 14, 2024
PubMed
Summary
This summary is machine-generated.

Aerobic granular sludge (AGS) in continuous-flow reactors (CFRs) show promise for wastewater treatment, offering comparable efficiency to traditional methods. These systems can intensify existing plants with minimal retrofitting, though further research on granulation is needed.

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Area of Science:

  • Environmental Engineering
  • Microbiology
  • Wastewater Treatment

Background:

  • Aerobic granular sludge (AGS) in continuous-flow reactors (CFRs) has gained traction over the last 20 years.
  • AGS-CFRs demonstrate comparable morphology, settleability, and pollutant removal to sequencing batch reactors, despite smaller particle sizes.
  • Shear force and selection pressure are key drivers for granulation, with feast/famine conditions and bioaugmentation aiding stability and nutrient removal.

Approach:

  • This review assesses the application of AGS-CFRs in full-scale wastewater treatment plants (WWTPs).
  • Examines two distinct AGS-CFR processes: hydrocyclone-based densified activated sludge and microaerobic-aerobic configurations with internal separators.
  • Evaluates their impact on sludge characteristics, treatment capacity, stability, and infrastructure requirements.

Key Points:

  • Hydrocyclone-based systems improve sludge density, settleability, and phosphorus removal, boosting treatment capacity.
  • Microaerobic-aerobic configurations with internal separators induce granulation, ensuring stability and reducing the need for external clarifiers.
  • AGS-CFRs offer significant potential for intensifying existing WWTPs with minimal retrofitting.

Conclusions:

  • AGS-CFRs present a viable technology for upgrading wastewater treatment infrastructure.
  • Further research into granulation mechanisms, long-term stability, and nutrient removal is essential for broader adoption.
  • These systems can lead to reduced land and energy consumption in wastewater treatment.