With the mobile pilot plant, the ILS process for nitrogen recovery can be tested in various operating environments. We developed the ion exchanger loop stripping process (ILS) in the ReNOx-project. ILS has already been successfully tested on a municipal sewage treatment plant for ammonium recovery from effluents of mechanical sludge dewatering. As a novel hybrid process, it combines the ion exchange on natural zeolites for pre-enrichment of ammonium with a simultaneous air stripping of the (concentrated) regeneration solution.
The pilot plant consists of three ion exchange columns made of polypropylene (PP), which can each be filled with 100 kg of zeolite. The columns are charged individually or in series from bottom to top with the liquid medium to be purified, which is continuously supplied from a separate storage container. The plant is designed for a treatment capacity of 500-1000 liters of medium per hour. The pilot plant has two identical, packed stripping and scrubbing columns (PP). Stripper and scrubber are equipped with heated sumps (max. 80°C) to hold the regeneration and washing solution. In addition to several sampling options, the system is equipped with appropriate measuring and control equipment for safe operation and testing of the ILS process with different media.
The complete system is installed in a 20 'container and can therefore be transported by truck to the respective test location. For on-site operation only power and cooling water connections are required together with an operato