Biological treatment systems are commonly used to treat municipal wastewater and sewage, as well as sludge and industrial effluents. Read More

Biological systems use bacteria, in either aerobic or anaerobic conditions, to break down organic matter into carbon dioxide and cellular mass.

Packaged treatment plant are typically suitable for population equivalents under 400. They range from plants for single houses to systems for housing estates, caravan parks or leisure applications.

Engineered systems tend to be specified for population equivalents over 400, and particularly in industrial applications. Engineered systems can consist of a modular arrangement of packaged plant.

Submerged aerated filters (SAF) are small footprint units with few moving parts. They are designed for treating municipal wastewater, producing effluent <20mg/l BOD, <20mg/l TSS and <5mg/l NH3.

Membrane bioreactors (MBRs) combine a submerged membrane filtration process with a bioreactor. They are compact and produce a high-quality effluent, generally <2mg/l BOD, <2mg/l TSS and <0.6mg/l NH3.

Other technologies include biological aerated filters (BAF), sequencing batch reactors (SBR), moving bed biofilm reactors (MBBR) and continuous flow reactors (CFR).

Reedbeds and constructed wetlands  are an alternative biological treatment system that use bacteria attached to the surface of soild, sand or gravel media to treat wastewater, run-off, sewage and other contaminants. 

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Biological treatment - helping you find the best solution for your project.

  • 2H Water Technologies: Trickling Filters deliver guaranteed performance
    Trickling Filters deliver guaranteed performance
    2H Water Technologies
    Having already supplied a number of trickling filter solutions on various wastewater sites in Scotland, 2H Water was approached by Scottish Water Solutions. They needed to treat effluent from the city of Stranraer and...
  • Puriflo - a division of ESE Engineering: Submerged aerated media plant
    Submerged aerated media plant
    Puriflo - a division of ESE Engineering
    Puriflo specialises in the design of submerged aerated media plant, which can deal with much higher loadings per cubic metre of tank volume than an activated sludge plant. No daily checks are required on the mixed liquor...
  • H+E UK: Watercell containerised wastewater treatment with MBR
    Watercell containerised wastewater treatment with MBR
    H+E UK
    Watercell is a pre-fabricated, containerised membrane bioreactor for wastewater treatment. The system is fully transportable and is scalable to meet requirements. An ultrafiltration membrane stage ensures high-quality...
  • ARM Ltd: Success case studies using aerated reed beds
    Success case studies using aerated reed beds
    ARM Ltd
    Buffalo Airport is in Washington State (USA) and generates significant loads of runoff contaminated with anti-freeze. This had been a difficult issue to resolve in wintertime, as large volumes of runoff and snow melt...
  • H+E UK: BIOFIT®.Oxyd2 advanced oxidation process
    BIOFIT®.Oxyd2 advanced oxidation process
    H+E UK
    The BIOFIT®.Oxyd2 process is used for the treatment of wastewater where the pollutants are difficult or impossible to remove using conventional biological processes alone. It uses a chemical oxidation process to break down...
  • Puriflo - a division of ESE Engineering: Sequential batch reactors
    Sequential batch reactors
    Puriflo - a division of ESE Engineering
    Puriflo has wide experience in building sequential batch reactors, a form of activated sludge treatment in which both aeration and settling take place in the same tank. The process can only be applied in cases where the flow...
  • ARM Ltd: Ferric sludge reed bed treatment for potable water
    Ferric sludge reed bed treatment for potable water
    ARM Ltd
    Essex & Suffolk Water installed the world’s first natural reed bed system to treat ferric sludge produced during the production of drinking water at its Hanningfield Water Treatment Works. It was estimated that the reed beds...
  • ARM Ltd: Phytocube compact reedbed treatment system
    Phytocube compact reedbed treatment system
    ARM Ltd
    Phytocube is a compact, modular reedbed treatment system designed for low flowrates of wastewater. Suitable for single houses and small industrial applications, the Phytocube provides all the benefits of reedbed treatment...
  • ARM Ltd: Vertical flow aerated wetland for Severn Trent Water
    Vertical flow aerated wetland for Severn Trent Water
    ARM Ltd
    ARM Ltd was contracted by Severn Trent Water through their framework contractor MWH Treatment to design and construct the first full-scale constructed wetland technology to be used by a UK water company for full treatment of...
  • Puriflo - a division of ESE Engineering: Membrane bioreactors
    Membrane bioreactors
    Puriflo - a division of ESE Engineering
    Puriflo's membrane bioreactors feature submerged aerated media, offering high performance with low electrical running costs and requiring little maintenance. They are manufactured with flat-sheet membranes and are designed...
  • ELIQUO HYDROK: Microdyn-Nadir BIO-CEL® MBR
    Microdyn-Nadir BIO-CEL® MBR
    ELIQUO HYDROK
    ELIQUO HYDROK has the rights for the UK distribution of the Microdyn-Nadir BIO-CEL® Membrane Bio Reactors to add to a portfolio of wastewater treatment processes. The MBR process is a combination of a classic activated...
  • 2H Water Technologies: Trickling filters reduce ammonia level for Severn Trent
    Trickling filters reduce ammonia level for Severn Trent
    2H Water Technologies
    Severn Trent Water had been operating the Longbridge STW with rock media trickling filters but, whilst the BOD reduction was being achieved, the existing plant would not be able to meet future ammonia consent levels.
  • Warden Biomedia: Biological filter media - Yorkshire Water Danesmoor site
    Biological filter media - Yorkshire Water Danesmoor site
    Warden Biomedia
    Biomarble was selected from Warden Biomedia's random filter media range to provide ultra-efficient and cost-effective tertiary treatment in WPL Ltd's wastewater process solution (N-SAF) for Yorkshire Water's Danesmoor site
  • ARM Ltd: Aerated vertical flow reed bed for Highland Spring
    Aerated vertical flow reed bed for Highland Spring
    ARM Ltd
    Highland Spring's wastewater treatment plant at its Blaen Twyni site in the Brecon Beacons had been struggling to achieve reliable performance and maintain discharges within consent. ARM installed an aerated vertical reed...
  • ELIQUO HYDROK: IFAS enhanced biomass fixed bed system
    IFAS enhanced biomass fixed bed system
    ELIQUO HYDROK
    The Hydrok IFAS™ (Integrated Fixed-Film Activated Sludge) system utilises Biotextil Cleartec media for the growth of biomass for the treatment of effluent. Biotextil Cleartec is a polypropylene product that creates a large...
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Biological treatment- helping you find the best companies for your project.