Pre-assembled greywater recycling systems

Prefiltration and bioreactor

In the AQUALOOP complete greywater systems, we use prefabricated, stable, opaque and reinforced internal tanks.

The greywater from showers, bathtubs and hand washbasins is pre-filtered through a highly efficient PURAIN filter before entering the bioreactor. The dirt collected in the PURAIN filter is regularly flushed back into the sewer using a backwash nozzle.

In the core of the plant, the bioreactor, continuous biodegradation takes place. This is achieved by means of a tubular diffuser located at the bottom of the plant and packing floating in the water. This fine-beaded diffuser, which is supplied with oxygen by a blower, creates an aerated fluidized bed, which is a prerequisite for the growth of bacteria within the greywater. Settlement occurs here on the many hundreds of AQUALOOP packed beds, which are special suspended bodies with a large surface area. A sludge pump, which is also located at the bottom, periodically removes any sediment that is formed.

Membrane station and control

The bioreactor also contains the AQUALOOP membrane stations, which filter the greywater into the clear water storage tank. For this purpose, all membrane stations with a treatment volume of 600 to 21,00 liters per day are equipped with a filtration and backwash pump. For plants with a treatment volume of 32,400 liters per day or more, one central filtration and backwash pump each is used. Due to the small membrane pore size of 0.02 µm, particles, bacteria and viruses are retained by ultrafiltration.

The membranes are periodically cleaned by backwashing and by coarse air bubbles. The three plants in the smallest category are controlled here with the aid of an AQUALOOP controller. Systems with a treatment volume of 5,400 l/day or more are equipped with the browser-capable I-CONNECT control system  and the automatic chemical cleaning technology I-CON-ADS. This enables even more economical and low-maintenance operation, especially for the larger systems. Smaller systems, on the other hand, are equipped with the triple membrane surface to minimize the required maintenance intervals.

Further process

The clean service water is pumped to the consumers by our various pressure boosting systems, such as the RAINMASTER systems, depending on the calculated and required flow rate and pressure. The service water can be used for consumers such as toilets, washing machines or irrigation. In order to achieve the greatest possible safety, the already ultrafiltrated service water passes through a UV treatment as the last stage. The dimensioning of the UV disinfection system is done according to the dimensioning of the pressure boosting system.