KLARO One small wastewater treatment plant

SBR cycle & effluent values
Save money

KLARO One is the latest development in fully biological wastewater treatment plant from KLARO. It operates based on the tried and tested KLARO principle: No pumps, or mechanical and electrical parts in the wastewater. KLARO One offers maximum flexibility for new construction or retrofit.

KLARO One stands for ...


... safety

  • Large buffers, designed for the total daily volume
  • Automatic level measurement
  • Excellent effluent values

... sophisticated technology

  • Microprocessor control
  • Whisper quiet stepper motors
  • Plug & Play retrofit kit
  • No putrid odours

... low running costs

  • Low level of sewage sludge
  • Minimal power consumption
  • Minimal maintenance
KLARO One in single chamber pit

Flexibility in installing


KLARO One is constructed in a way, that it is possible to install the system in nearly every tank.

  • Can be installed for a new construction or as retrofit in existing pits
  • Can be retrofitted to 1, 2, 3 or 4 chamber pits
  • Suitable for round and rectangular pits
  • Can be used in tanks made of different materials (concrete, plastic, fibreglass, ...)
KLARO One in single chamber pit
Single chamber pit
KLARO One in two chamber pit
Two chamber pit
KLARO One in three chamber pit
Three chamber pit
KLARO One in four chamber pit
Four chamber pit

Components of the KLARO One


Aeration unit


Two (or more - depending on the number of chambers) newly developed aeration beams are used in every variant of the KLARO One. The membrane is protected from damage by high quality stainless steel braces.

KLARO One aeration unit

Components in a single chamber pit

KLARO One components in single chamber pit



A customisable partition is used in the single chamber pit, which leaves sufficient space below for the transfer of water and sludge.


Sludge disposal tube


The disposal operator draws the sludge through here. The inlet is arranged so that sufficient seed sludge always remains in the system.

Components in a two or more chamber pit

KLARO One components in two or more chamber pits

Dividing wall


In the two, three or four chamber pit the transfer of the wastewater occurs through at least one hole in the dividing wall. In the second chamber a plate protects against excessive turbulence through the incoming water.

Prepared for every situation

Step motors


The KLARO One is controlled via the new step motors, which are most of all characterized by low power consumption, silent operation and low maintenance.

Further information can be found here.


Level measurement


KLARO One measures the fill level with a pressure sensor and thus monitors the flow situation. Consequently the system can respond optimally to the current conditions (underload or overload) and adjust purification accordingly.


Underload detection


If there is little or no flow, or the fill level is low, the cleaning cycle is not run and only slight aeration applied. As a result both electricity is saved and the cleaning performance is maintained. With the automatic underload detection, the run time of the plant automatically adjusts itself to the actual amount of wastewater.


Overload detection


If the flow is raised or too high and the fill level is too high, the cleaning cycle is stopped and the settle phase automatically initiated. The activated sludge settles out. A clear water zone forms in the upper part of the activated phase. This is followed by clear water discharge. Therefore this prevents sludge drifting away with overloading or unpurified wastewater being drawn off with excess backwater.

KLARO One EPP switch cabinet

The SBR cycle


KLARO One is a fully biological wastewater treatment plant, which basically consists of an aerobic treatment stage after the sequencial batch reactor (SBR) process. This treatment stage is divided into a pre-treatment stage and an aeration stage, which are interconnected by an overflow.

KLARO One SBR process

1. Aeration phase

The raw sewage enters the pre-treatment stage and directly undergoes aerobic purification. Through the aerobic purification activation of micro-organisms occurs.


2. Settle phase

When aeration is interrupted by the control system the activated sludge settles to the bottom. A clear water zone forms in the upper part of the container. If raw sewage enters into the system during this, it is retained by the dividing wall or baffle in the pre-treatment stage.


3. Discharge phase

In the final purification step, the clarified wastewater from the aeration stage is removed by means of a compressed air lift. The purification process can start over again.

KLARO One effluent values

Save money with the KLARO One

Minimal power consumption


KLARO One saves power in operation. The small number of airlift operations, and the use of step motors reduces power consumption dramatically.

KLARO One saves power

Low level of sewage sludge


The aeration of the entire wastewater leads to immediate activation of sewage. The formation of sludge is reduced to a minimum, therefore extending emptying intervals. Disposal costs are reduced.

KLARO One minimum level of sewage sludge

Low maintenance costs


The high-grade components of KLARO One are characterised by quality and robustness. The parts are arranged so that the time required during maintenance is minimized.

KLARO One low maintenance costs