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.

Filling Pellets

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!

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