Industry had a complex and toxic waste water and their demands for a new waste water treatment process were harsh : total detoxification and more than 95% removal of complex organic compound.
A unique biological process based on A nox kaldnes TMMBBR technology were chosen : micro fungi take care of toxicity in a three stage reactor, while bacteria reduce TOC in the following three reactor.
Toxicity: Non emeasurable
Inhibe oapproached An oxkaldnes is order to obtain astate of art solution for a new treatment plant. The waste water from the pharmaceutical production washighly toxic and in addition contain edmany difficult to degrade organic compounds. The recipient wasth every sensitive Lake, which surround several cities.
To be able to discharge waste water in to lake it had to be totally detoxified and at same time at least 95% of the organic content had to be removed.
Several Activated sludge processes were initially unsuccessfully tested. The main problem was that the waste water was toxic not only animals and plants but also for the bacteria used in biological treatment processes. An R&D project was then launched based on the newly developed An oxkaldnes TMMBBR technology.
The flow is approx. 1800m3/day. Incoming TOC averaging 440kg/day but varies considerably because of batch wise production.
The hydraulic retention time in each reactor is 3-4h. The biological treatment process is complemented with chemical phosphorous precipitation and polishing with activated carbon and a sand filter to take care of any residual toxicity and suspended solids, respectively.
The treatment plant has been operational and treatment result have been superior. In addition, the built in tolerance to peak loads and toxicity in the MBBR process has provide a very stable operation that could not have been obtained with conventional treatment processes.
The treated waste water is totally detoxified by the action of the micro fungi thatal so takes care of 80% of TOC. The bacterial communities in the following reactors remove additional organic substances so that the overall TOC removal is 97%. Approximately 80% of incoming nitrogen is removed(far more than the discharge limit). Phosphorous removal is 99%.
During the years, environmental studies of the discharge point have shown that the recipient has not received any residual toxicity from the treatment process and that the amount of nitrogen, phosphorous, COD and the suspended solid shave decreased in the area.