ClearFox® SBR Retrofitting Kit

ClearFox® SBR Retrofitting Kit systems present a cost effective and efficient way to create an advanced biological wastewater treatment system using existing tanks and infrastructure. They allow septic tanks that are currently in place at houses, hotels, schools and other applications to be transformed into high efficiency wastewater treatment plants. Effluent storage tanks on industrial sites can also be upgraded in the same way. Retrofitting kits offer a very cost effective method of achieving compliance with environmental regulations and discharge consents with low OPEX and CAPEX.


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SBR Industrial Systems

Flexible biological treatment upgrade

For industrial applications SBR Retrofitting Kist can be designed for 15 m³/day to > 5,000 m³/day. For municipal and household applications the standard systems are available from 5 to 1,000 persons. Larger systems are designed specifically for each project.

Regardless of the tank dimensions or capacity, our process engineers can design SBR equipment kits that are compatible. Compared to other process technologies that require tanks with specific shapes and numbers of chambers, the ClearFox® SBR presents total flexibility. The tank to be retrofitted can be of any shape, any material and can have any number of chambers.


When upgrading a septic tank system or failing wastewater treatment plant to achieve compliance with effluent standards, an SBR kit retrofit of existing tanks is the most cost-effective solution available on the market. A summary of the key advantages to this process technology selection are as follows:

  • SBR equipment in kit form to install into any tank configuration (above or below ground)
  • Can be installed in tanks with 1, 2 or 3 chambers of any shape (subject to minimum volumes)
  • Systems can be installed in Concrete / GRP / Plastic tanks
  • SBR Retrofitting Kit can also be installed into existing tanks for upgrade works
  • Kits designed for large projects (no limits)
  • Simple installation requires no previous experience as kits are preassembled
  • A low-cost, high-quality solution for tank manufacturers
  • Suitable for the treatment of domestic, municipal and industrial wastewaters
  • Kits designed also for large projects (up to 15,000 PE)
  • Complete support from ClearFox® for engineering, design and installation
  • Airlift or submersible pump options depending on discharge / population are delivered
ClearFox SBR industrial wastewater treatment solution


How does a ClearFox® SBR Retrofitting Kit Wastewater plant work?

SBR refers to sequential batch reactor. This technology is a controlled wastewater treatment process. Batches of wastewater undergo treatment in sequence. This control process allows each batch of wastewater to undergo treatment for any required time frame. This enables the achievement of any level of treatment as a result.

In brief, the typical steps in the SBR Retrofitting Kit process are as follows:
The activated sludge treatment plant with SBR has an upstream coarse separator that serves as storage for the primary and secondary sludge and to buffer the inlet water. Sludge filling and Clearwater extraction are completed by means of airlift pumps. The plants control system recognises four main states in the Normal cycle.

ClearFox SBR wastewater treatment solution

The is SBR Cycle is variable and changes can be made to the duration, frequency and arrangement of the phases.

  1. Filling phase: the sewage enters the first chamber and any large solids are retained. The filling pump then conveys waste water into the second chamber which is the biological reactor.
  2. Purification/Aeration stage: The waste water is circulated in the SBR reactor using air fed by the membrane plates and the bacteria are supplied with oxygen, thus supporting the actual biological treatment by microorganisms. Short aeration and non-aeration stages (for denitrification) alternate and are controlled by the computer software. An activated sludge grows with millions of microorganisms which completely break down the wastewater.
  3. Sedimentation/settling stage: A rest phase follows. The activated sludge sinks (sedimentation) to the bottom of the water column. This allows a clarified water zone to form at the top of the reactor chamber.
  4. Clearwater extraction stage: A Clearwater pump conveys the purified waste water that remains above the “Clearwater discharge point” to the plant outlet, lowering the water level in the reactor. The settled activated sludge is then transferred back into the first chamber and the process repeats with the next batch of wastewater.

A complete purification cycle takes approximately 7 hours

Energy-saving cycle: The purification cycle programme continues running unabated, but with a shorter aeration phase, which reduces the amount of energy required. Depending on the inlet quantity to the prechamber, the programme then decides fully automatically, whether the energy- saving cycle should continue, or whether it should switch back to normal operating mode.

wastewater treatment process

Read More About ClearFox® SBR Projects

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