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SBR-Wastewater treatment plant

KANKYO realizes biological wastewater treatment plants in accordance to the SBR-process (“Sequencing-Batch-Reactor”) for the treatment of sewage.

Typical for the SBR-process is the combination of the procedural functions “Aeration” and “Clarification” in one reaction tank. Herefrom a stable and flexible process flow results.

Furthermore the SBR-process enables a compact plant design and a minimization of the investment costs. Because of the flexible plant geometry (tanks with circular, quadratic or rectangular footprint) SBR-wastewater treatment plants of KANKYO can be simply realized also under hindered project conditions (tourism areas, recreation centers, tower buildings etc.).


A possible configuration for a biological wastewater treatment plant is a batch reactor. In certain cases the aeration process and the settling process take place in the same basin to avoid the cost of a clarifier. In this case, the different steps of the treatment process are performed after each other. This type of wastewater treatment plant is called a sequencing (or sequential) batch reactor (SBR).

The water treatment process in a SBR consists of at least four steps:

In case of biological nitrogen removal, an anoxic step has to be added to the treatment
program. In this step the reactor is mixed but not aerated.


SBR wastewater treatment is interesting for wastewaters with a relatively high concentration of organic pollutants. In the case of continuously produced wastewaters a buffer is needed to store the wastewater during the settling and release phases. In certain cases multiple SBR reactors are used simultaneously and at least one reactor is fed at each moment.

Operational costs

Besides the water treatment infrastructure there are also operational costs associated with water treatment. The most important among these are the energy cost for aeration and the handling of the produced biological waste sludge.