Denitrification as oxygen-free water filtration removes toxic nitrogen compounds from a (partially)-closed aquaculture facility. In this process, nitrate (NO3) is broken down from the water in the plant with the aid of special bacteria, the denitrifiers. In nitrate respiration, the bacteria use the nitrogen (NO3‑N) bound in the nitrate as well as a carbon source (substrate, e.g. acetic acid CH3COOH) to generate energy and build cell structures. The bacteria extract the nitrogen from the process water, whereas the carbon source must be added as required. This dosage is decisive for stable denitrification. After the conversion of the nitrate, only molecular nitrogen remains. This is harmless to the environment and escapes from the plant as a gas without leaving any residue. The denitrification process significantly improves the water quality in fish farming systems. As a result, fish feel less stress and mortality can be significantly reduced.
The required size of a denitrification depends on the amount of nitrogen introduced daily by the feed. With a volume of 1000 L (IBC), our standard product is designed for a feed load of about 5 kilograms per day. Other sizes can be offered individually on request.
Our automation solution uses sensors to monitor and optimally control the biological processes in denitrification. A modular, expandable measuring and control system is installed, which is based on a programmable logic controller. The SPS takes over the supply of nitrogen-rich plant process water as well as the dosing of the carbon source. Target values are automatically set by the system depending on the feed quantity entered on the touch display. If a measured value is outside the desired limits or if a component of the denitrification fails, the controller displays corresponding error or warning messages on the info display.
Our system is also suitable for integration into existing process control systems or, on request, can record additional data from existing measuring instruments.
In our denitrification we use for denitrification reactors optimized carrier pellets made of food-safe polypropylene plastic. Carrier pellets serve the bacterial cultures as a place to settle during biological water treatment. This prevents the bacteria from being constantly flushed out of the filter. At the same time, the special structure and geometry of the pellets increase their specific surface area. This offers the bacteria plenty of space to grow. In addition, openings and bars in the pellets ensure that the bacteria are well washed around by the process water and the substrate. This ensures an optimal supply of nutrients to the cultures. The result is a particularly high filter performance.
Are you interested?
We would be glad to make you an individual offer for a stable denitrification!