Reduction of Micropollutants
LaboSafe has developed, through several projects for WWTP and for miscellaneous industries, as well as during a recent pilot project, a process allowing to reduce the concentration of micropollutants with a remarkable efficiency. The analyzes, made during the pilot project by EAWAG, in Dübendorf, showed that the process allowed reducing dramatically the dosing and the contact time in comparison to former pilot projects or other processes.
LaboSafe proposes the planing and the turn-key construction of Microzon® installations, allowing to offer, thanks to the proven efficiency of the process, in terms of reduction of ozone production and reduction of the volume of the contact reactors, important investment, operation and energy savings.
The main components of a
are one or several ozone generators, a control cabinet and control equipment, a cooling and energy recuperation system, and reactors and contact tanks. The ozone generator is fed with oxygen and nitrogen, stored in tanks or produced with compressors. The water is pumped from the last WWTP basins into the reactors, which are grouped in order to optimize the contact time with varying flows. The ozone is injected at the bottom of the reactors, by the means of ceramic porous diffusers, to be dissolved in the water through the contact tanks.
Results of the pilot tests
The first analyzes showed results allowing to consider a reduction of the dosing and the contact time.
The optimum dosing appeared to be between 3 and 4 g of dissolved ozone per m3 water to treat ( 3-4 mg/l). The optimum contact time appeared to be between 5 and 10 min. The analyzes also indicated that, with a dosing up to 5 mg/l, there were only a few percent of residual ozone after less than 10 min. contact time.
A procedure and a standard pilot test installation, for a max. flow of 12m3/h, are avalable for WWTP.