1-Installation

The plant is completely prefabricated and can be installed above ground or underground. The installation in earth  doesn't require a special foundation if the ground bearing  capacity would stand the weight of the filled plant. The diameter of the pit has to be chosen  60 cm larger than the diameter of the tank .Backfilling has to be done with sand or fine-grained gravel.

2-Electric Control

The control for the operation of the sewage treatment plant is installed in a separate control cabinet. The control cabinet may be set up even where it is not protected from the weather . Direct exposure to sunlight should be avoided . The safety class IP 65  applies to the delivery . Faults are indicated by the red malfunction  signal lighting up ( Alarm Red ) and by an acoustic alarm. The compressor for the aeration and the solenoid valve /pump for the sludge recirculation are controlled via a programmable control unit . The settings can be altered by the push buttons on the board

3-Starting up

The system must be filled before starting operations. Please use tap water for this purpose or processed water free of solid material (well water and the likes). As soon as all chambers connected with each other via fluid currents are filled, the system may be started by turning on the master switch at the control cabinet. After a waiting time, the aerator starts up and air bubbles arise in the fixed-bed chamber.  A consistent bubbling indicates the proper functioning of the aerator. The return sludge pump operates periodically.  During this process, it should be clearly audible that water from the final clarification is being pumped into the first chamber of the preliminary clarification.

4-Start-up period / Continuous operation

The aeration intervals are adjusted by the factory to the maximum connectable inhabitant equivalent values. These settings must be kept during the start-up period for the development of a stable biology. During the start-up period, the outflow values must be regularly controlled by authorized specialists. When the required outflow values are reached, the intervals may be adjusted to the actual connected inhabitant equivalent values res. to the corresponding pollution. The alterations of the aeration settings must only be carried out after directly consulting NDG or your NDG retailer