KLARO One
The fully aerated wastewater treatment plant
KLARO One is a single-stage, fully biological wastewater treatment plant based on the SBR process with simultaneous aerobic sludge stabilization. Thanks to the integrated sludge storage tank and buffer, the system is extremely compact and efficient. Since its market launch in 2015, the KLARO One has established itself as a popular solution for small system sizes and demanding areas of application. It is particularly suitable for private households, sensitive locations and systems with 4, 6 or 8 population equivalents (PE).
A decisive advantage: The KLARO One does not require pre-treatment. The incoming wastewater is directly subjected to aerobic treatment, which makes the process particularly efficient and easy to maintain.
- From domestic wastewater treatment plants (4 PE) to small villages (600 PE)
- For the treatment of domestic, commercial or industrial wastewater
- From new systems to retrofitting existing systems
Advantages and features of the
KLARO One system
- No risk of concrete corrosion
- Separation of wastewater and technology
- Air lift instead of submersible pump
- Set-up kit made of wastewater-resistant plastic / built-in parts made of wastewater-resistant stainless steel
- No risk of rotting odor
- Stable process against impact loads and underloads
- Stable cleaning performance even in winter
- High operational safety
- Sophisticated technology - on the market since 2015 - in use worldwide
- No sealed partition wall required
- Independent of container material and geometry
- Drainage classes and approvals for C, N, D
- Wide range of process customization options via the control system
- Sludge stabilization and mineralization, no digestion
- Very low sludge accumulation and therefore low desludging frequency
- Low maintenance - no sludge measurement required in primary sedimentation
- Low energy consumption due to fine-bubble ventilation
- User-friendly, thanks to automatic operation
Single-stage SBR purification process:
Effective wastewater treatment in three steps
1st aeration phase
The raw wastewater is fed directly into the front section of the system and undergoes aerobic treatment. Membrane aerators at the bottom of the tank ensure uniform aeration, while an external air compressor supplies the required compressed air. The intermittent aeration supplies the microorganisms in the activated sludge with the oxygen required to break down the pollutants. At the same time, the sludge is mineralized, which optimizes the cleaning performance and reduces the amount of sludge.
2nd weaning phase
During the 120-minute settling phase, aeration is paused so that the activated sludge can sediment. A sludge layer forms at the bottom, while a clear water zone forms in the upper area. The inflowing raw wastewater is held back in the front area of the plant so as not to disturb the process. This process ensures a clear separation of purified water and sludge.
3. clear water outlet
An air lift at the rear of the system drains some of the clear water from the tank. Thanks to its special design, the pumping of any floating sludge on the clear water layer is reliably prevented. At the same time, an inlet slope minimizes the ingress of activated sludge during the aeration phase. The air lift also ensures that the desired minimum water level in the system is maintained - without any additional components.
Tested cleaning quality with the KLARO One system
The KLARO One system achieves outstanding effluent values that are comparable to those of municipal wastewater treatment plants. This performance is confirmed by the results of extensive tests and the numerous plants in operation worldwide, which are regularly maintained and inspected. The system has undergone intensive practical testing at the PIA testing institute in accordance with the EN 12566-3 standard and therefore meets the highest quality standards for efficient wastewater treatment.
- Outstanding cleaning performance: Clean and safe discharge water.
- Efficient nitrification: Reliable conversion of ammonium into nitrate.
- Constant discharge values: Stable even with changing loads.
- Reliable operation: No malfunctions or frequent interventions.
- Energy-efficient: Low power consumption for maximum sustainability.
- Minimal sludge accumulation: Proven sludge disposal frequency almost zero.
In addition, several voluntary endurance tests were carried out to confirm performance:
- Sludge growth
- Bathtub impact
- Sludge removal and restart
Discharge values
| Waste water values | Effluent values* | Efficiency* |
| COD | 43 mg/l | 94,2 % |
| BOD5 | 7 mg/l | 96,0 % |
| NH4-N | 0.5 mg/l | 96,3 % |
| Nges | 7.9 mg/l | 87,0 % |
| Pges | 1.6 mg/l 0.4 mg/l* | 80.0 % 95.1 %* |
| AFS | 14 mg/l | 96,3 % |
* with P-precipitation
Drainage classes
| C | Plants with carbon capture |
| N | Plants with carbon degradation and nitrification |
| D | Plants with carbon degradation, nitrification and denitrification |
| +P | Plants with phosphate precipitation |
| +H | Plants with hygienization |
In Germany, when approving a small wastewater treatment plant, the authorities specify the required discharge class ("purification quality"), which the plant must safely achieve during operation. With the KLARO system, all discharge classes are possible - all certifications and approvals are available. This means that operators of KLARO systems are also future-proof: if requirements become more stringent, it is possible to switch to a higher discharge class.
By the way: The requirements in Austria, Switzerland and other European countries are also met.
Certified reliability
The certified reliability of the KLARO One is ensured by innovative and patented siphon solutions that effectively prevent sludge discharge. In addition to improving the siphon technology, correct dimensioning also plays a decisive role - an aspect that KLARO consistently implements. This dimensioning ensures that impact loads, such as those caused by external feed peaks, are easily compensated for.
A typical example of an inflow peak is the simultaneous emptying of two bathtubs, which means around 400 liters of water in just 3 minutes. A special test was carried out on the KLARO One to check the performance of the system even with extreme hydraulic peak loads. A 5-EW system was operated at full load and an additional 400 liters of water were added in just 3 minutes - a simulation of two bathtubs being emptied at the same time.
Thanks to the specialized siphon design, the water remained clean in the drain during the entire process, both at peak load and during the subsequent pumping process. This confirms the high functionality of the KLARO One even under extreme conditions.
The result of this test is impressive and has been officially confirmed by the PIA certificate. The process and dimensioning of the KLARO One ensure perfect functionality and avoid undesirable operating problems such as sludge discharge, which is now also confirmed by the PIA certification.
