Specialty chemicals company LANXESS, one of the world’s foremost suppliers of water treatment solutions, is exhibiting for the first time at the top tradeshow IFAT in Munich from May 30 to June 3.
Its presentation at this international innovation platform for environmental technologies focuses on high-performance ion exchange resins from the Lewatit product range for wastewater treatment and the new reverse osmosis membrane elements from the Lewabrane ASD series with their novel feedspacer design.
Ion exchange resins that remove heavy metals from wastewater – as they occur in the metal processing industry, for example – can prevent pollution of groundwater and thus indirectly ensure clean drinking water.
The hybrid adsorber Lewatit FO 36 – a polymer-based anion exchange resin modified with a special, nanoscale iron oxide – allows highly efficient and selective removal of arsenic anions from drinking water. Arsenate and arsenite ions are attached via a covalent bond to the iron oxide surface and can thus be removed from the surrounding water.
Lewatit MonoPlus TP 207 is a weakly acidic, macroporous cation exchange resin with iminodiacetate groups for the selective binding of heavy metal cations from weakly acidic to slightly alkaline solutions. It is characterized by a very tight particle size distribution, which means it consists of beads of very similar size. Its superior kinetic behavior results in faster uptake of ions and better capacity utilization compared to heterodisperse ion exchange resins.
Lewatit MonoPlus TP 207 is ideal for the selective removal of trace heavy metals, particularly copper and nickel ions, from wastewater in metal surface finishing, for recovery of metals from electroplating rinses, removal of metal contaminants from processing and pickling baths, drinking water production and groundwater remediation.
A further development of the ion exchange resin Lewatit TP 214, which has proven its worth over more than 25 years, is the monodisperse, macroporous chelate resin Lewatit MonoPlus TP 214. Its thiourea groups have a high affinity with precious and platinum metals and mercury. It is thus used in particular for removing mercury, for example in off-gas scrubbing, chloralkali electrolysis plants, groundwater purification and metal separation and recovery in hydrometallurgy.
Lewatit MonoPlus TP 214 is used, for instance, in flue gas scrubbing in the waste incineration plant at the Abfallentsorgungs- und -verwertungsgesellschaft Köln mbH (AVG Köln). All of Cologne’s non-recyclable domestic waste and non-recyclable remnants of bulk, industrial and building site waste are incinerated here – in 2014, this totaled around 740,000 metric tons. One kilogram of this contains on average half a milligram of mercury.