Activated Sludge Process
Activated Sludge Process - Related Videos
15:19
Development of Sulfidogenic Sludge from Marine Sediments and Trichloroethylene Reduction in an Upflow Anaerobic Sludge Blanket Reactor
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Cited by 4 •
2015
Microbial sulfate reduction is a process of great importance in environmental biotechnology. The success of the sulfidogenic reactors depends among other factors on the microbial composition of the sludge. Here, we present a protocol to develop sulfidogenic sludge from hydrothermal vents sediments in a UASB reactor for reductive dechlorination purposes.
02:34
Preparing an Anaerobic Sludge Culture under Oxygen-Free Conditions
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2025
Source: Wagner, A. O.,et al., Medium Preparation for the Cultivation of Microorganisms under Strictly Anaerobic/Anoxic Conditions. J. Vis. Exp. (2019)This video demonstrates the preparation and inoculation of anaerobic cultures using oxygen-free sludge under strictly controlled, deoxygenated conditions.
06:10
Extraction of Structural Extracellular Polymeric Substances from Aerobic Granular Sludge
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Cited by 201 •
2016
The protocol provides a methodology to solubilize aerobic granular sludge in order to extract alginate-like extracellular polymers (ALE).
09:27
Measuring the Shape and Size of Activated Sludge Particles Immobilized in Agar with an Open Source Software Pipeline
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2019
The size and shape of particles in activated sludge are important parameters that are measured using varying methods. Inaccuracies arise from non-representative sampling, suboptimal images, and subjective analysis parameters. To minimize these errors and ease measurement, we present a protocol specifying every step, including an open source software pipeline.
06:11
Measuring Biomethane Potential of Food Scrap Waste Anaerobically Co-Digested with Waste-Activated Sludge Using Respirometry
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2024
This protocol describes a best practice for determining methane production and microbial kinetic parameters using respirometry for anaerobic microbiota co-digesting food scrap waste and waste-activated sludge.
FAQs
Microorganisms grow together with trapped suspended material to form flocs, which provide a concentrated biological community in the aeration tank. The organisms consume dissolved and suspended organic pollutants as they grow and metabolize, while the resulting flocs can later be separated from treated water by settling. Effective floc formation therefore links biological degradation with physical solids removal.
Oxygen supports microbial growth and metabolism during aeration, allowing bacteria and other organisms to process organic matter in the wastewater. The aeration tank must provide conditions that sustain this biological activity, because oxygen availability directly affects how efficiently microorganisms consume pollutants. Aeration control consequently influences treatment performance, biomass development, and the quality of the resulting effluent.
Sludge age describes how long the biological solids remain within the treatment system, while recycling returns a portion of settled biomass to the aeration tank. Together, these controls influence the amount and activity of microorganisms available for pollutant removal. They also affect solids production and can change how effectively the process supports removal of nutrients such as nitrogen.
Wastewater first enters an aeration tank, where oxygen and microorganisms support the consumption of organic pollutants. The mixed liquid then flows to a settling tank, allowing biomass flocs to separate from the treated water. A portion of the settled sludge returns to the aeration tank to maintain the biological population, while the clarified effluent continues onward.
Treatment facilities use this process for both municipal wastewater and industrial wastewater. Its biological stage can reduce dissolved and suspended organic pollutants before the treated water leaves the system. Because operators can adjust aeration, sludge age, and biomass recycling, the process can be managed to influence effluent cleanliness, solids production, and nutrient removal according to treatment needs.
Nitrogen removal is one of the treatment outcomes that can be influenced by operating conditions in an activated sludge system. Aeration, sludge age, and recycling affect the biological environment and the organisms retained in the system, which can alter nutrient-processing performance. Monitoring and adjusting these controls helps facilities pursue improved nitrogen removal while managing biomass and solids production.