Biological filtration and oxygenated reactors - Sewage Treatment Plant Manufacturers

June 1, 2024

Biological filtration and oxygenated reactors are essential components in wastewater treatment plants. They facilitate the removal of organic matter, suspended solids, and other pollutants through biological processes. These systems rely on microorganisms to break down contaminants, ensuring efficient wastewater purification.

Importance in Wastewater Treatment and Environmental Applications

Wastewater treatment is crucial for protecting public health and the environment. Biological filtration and oxygenated reactors play a vital role in reducing the organic load and nutrient levels in wastewater. This prevents the discharge of untreated effluents into water bodies, which could lead to eutrophication, oxygen depletion, and damage to aquatic ecosystems.

Principles of Biological Filtration

Biological filtration involves passing wastewater through a porous medium, such as sand, gravel, or synthetic materials. Microorganisms, including bacteria and protozoa, attach to the filter media and form a biological film or slime layer. As the wastewater flows through the filter, organic matter and suspended solids are removed through various mechanisms, including adsorption, entrapment, and biodegradation.

Types of Biological Filters

  1. Trickling Filters: Wastewater is distributed over a bed of highly permeable media, allowing it to trickle downward while microorganisms attached to the media break down organic matter.
  2. Rotating Biological Contactors (RBCs): Partially submerged discs rotate through the wastewater, providing a large surface area for microorganisms to grow and treat the influent.
  3. Submerged Biological Filters: These filters are fully submerged in the wastewater, with the media providing a surface for microorganisms to attach and degrade pollutants.

Oxygenated Reactors

Oxygenated reactors are designed to facilitate aerobic biological treatment processes. They introduce oxygen into the wastewater, promoting the growth of aerobic microorganisms that can effectively degrade organic matter.

Types of Oxygenated Reactors

Common types of oxygenated reactors include:

  1. Activated Sludge Reactors: Wastewater is aerated and mixed with a concentrated culture of microorganisms (activated sludge) to facilitate aerobic biodegradation.
  2. Membrane Bioreactors (MBRs): These combine activated sludge treatment with membrane filtration, enabling effective solid-liquid separation and producing high-quality effluent.
  3. Moving Bed Biofilm Reactors (MBBRs): Small plastic carriers provide a large surface area for biofilm growth, allowing efficient treatment while minimizing footprint.


Biological filtration and oxygenated reactors are widely employed in various settings, including:

  1. Municipal Wastewater Treatment Plants: Treating domestic sewage and protecting water bodies from pollution.
  2. Industrial Wastewater Treatment: Removing organic and inorganic contaminants from industrial effluents before discharge.
  3. Aquaculture Systems: Maintaining water quality and removing waste products in fish farming operations.
  4. Constructed Wetlands: Utilizing natural biological processes for wastewater treatment in engineered wetland systems.


Netsol Water, a leading manufacturer and supplier of wastewater treatment plants, incorporates biological filtration and oxygenated reactor technologies in their Sewage Treatment Plants (STPs). Their advanced systems make use of microorganisms to effectively remove pollutants and produce high-quality effluent. By combining expertise in biological treatment processes with innovative design, Netsol Water ensures efficient and sustainable wastewater management for municipalities, industries, and various applications.

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