In solid-liquid separation processes fine particles are often suspended in large volumes of liquid having a low solids concentration. The large filtration area required to handle such streams is in turn resulting in large filter housings, structures, plant footprints and corresponding high CAPEX and OPEX.
The CONTIBAC® RX slurry thickener technology offers a smart solution for these specific cases. The self cleaning filter elements in the CONTIBAC® RX automatic filter is grouping of multiple long and narrow cores in metal or plastic, surrounded by flat synthetic media cloths; elements are positioned in parallel, collectively providing a large filtration surface area in a compact space: roughly speaking, a certain vessel equipped with CONTIBAC® RX internals can fit up to 3-4 times the filter area with respect to the conventional design.
Cake is typically only few mm thick, which matches well with the low inlet solid concentration.
Both the inner core and the cloths are available in a variety of materials, enabling this technology to fit for a wide range of process conditions (e.g. temperature, chemical composition), which is the distinctive sign of DrM separation systems.
During backwashing, the cloth expands similarly to what happens with the traditional FUNDABAC® and CONTIBAC® design, thus resulting in the same, thorough cleaning typical of DrM filters in conventional execution.
Possible applications are in principle any solid-liquid separation process involving high flows, low solids concentration and no requirement for dry discharge; references are existing for recycling of silicon slicing coolant and for brine polishing in chlor-alkali industry, to name a few.