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Related Concept Videos

Bioreactor Controls-II01:18

Bioreactor Controls-II

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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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Bioreactor Design and Operational System01:29

Bioreactor Design and Operational System

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Bioreactors are engineered vessels designed to cultivate microorganisms under controlled conditions for industrial bioprocessing. They maintain sterility and allow precise regulation of pH, temperature, oxygen, and nutrient levels to optimize microbial growth and metabolite production. Bioreactors range from small laboratory units of 1 liter to industrial systems holding up to 500,000 liters, though only about 75% of their volume is actively used for fermentation. The remaining headspace...
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Bioreactor Controls-I01:28

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Maintaining optimal conditions within fermenters is essential for maximizing microbial productivity and ensuring process efficiency. This lesson focuses on key parameters—temperature, foam, pH, carbon dioxide, oxygen, and pressure—and their precise measurement and control strategies in fermentation systems.Temperature ControlTemperature regulation is critical due to the exothermic nature of many fermentation processes. In small laboratory fermenters, temperature is commonly...
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Scale-Up Processes01:14

Scale-Up Processes

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The scale-up of microbial fermentation processes is essential in industrial biotechnology, allowing the transition from laboratory-scale experiments to commercial-scale production while aiming to maintain product yield and quality. This process requires meticulous adjustment of equipment design, process parameters, and contamination control strategies to accommodate increasing culture volumes.At the laboratory scale, cultures are typically maintained in 1 to 10-liter glass or autoclavable...
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Batch vs Continuous Culture01:14

Batch vs Continuous Culture

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Fermentation is a foundational biotechnological process used to produce pharmaceuticals, biofuels, enzymes, and food additives. Among industrial strategies, batch and continuous fermentation are the two most widely applied. Although both rely on microbial conversion of substrates into desired products, they differ markedly in operation, productivity, and suitability for specific applications.Batch fermentation occurs in a closed system in which nutrient media and inoculum are added at the...
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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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Deciphering the granulation process in aeration self-circulating reactors: A robust strategy for continuous-flow

Zhi-Ming Qu1, Yue-Mei Wu2, Yu-Zhu Jiang2

  • 1National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing, 100124, China; Research and Development Center of Beijing Drainage Group Ltd., Beijing, 100124, China.

Environmental Research
|April 12, 2026
PubMed
Summary
This summary is machine-generated.

Continuous-flow aerobic granular sludge (AGS) systems benefit from the novel Zier reactor. This self-circulating design enhances biomass retention and stability for effective wastewater treatment.

Keywords:
Aerobic granular sludgeContinuous flowSelf-circulationSeparate aeration

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Area of Science:

  • Environmental Engineering
  • Wastewater Treatment Technologies
  • Biotechnology

Background:

  • Continuous-flow aerobic granular sludge (AGS) application is hindered by challenges in in-situ selection mechanisms, impacting biomass retention and stability.
  • Effective biomass retention and long-term stability are crucial for the successful implementation of AGS in wastewater treatment.

Purpose of the Study:

  • To evaluate an integrated self-circulating reactor (Zier) for continuous-flow aerobic granulation.
  • To investigate the granulation trajectory and process robustness of the Zier system.
  • To assess the Zier process's ability to overcome limitations in AGS technology.

Main Methods:

  • Utilized a self-circulating reactor (Zier) driven by hydrostatic pressure and density gradients.
  • Decoupled aeration and selection zones to provide consistent hydrodynamic shear.
  • Investigated granulation using two reactors inoculated with different sludge types and fed synthetic wastewater (COD ~300 mg/L, NH4+-N 50-65 mg/L).

Main Results:

  • Achieved rapid transition to granular dominance (>80% granular fraction >0.2 mm) within 170 days.
  • Maintained stable settling properties and sustained granular sludge at upflow velocities below 15 m/h.
  • Demonstrated effective organic removal (>85% COD) and total nitrogen removal (>70% TN).

Conclusions:

  • The Zier self-circulating configuration offers a structurally simplified and robust strategy for long-term continuous-flow aerobic granulation.
  • The decoupled aeration and selection zones effectively promote biomass retention and process stability.
  • This approach enhances the feasibility of AGS technology for efficient wastewater treatment.