The microscreen drum filter is an ideal solution for water filtration from wastewater treatment units. The use of these filters can be water filtration in the paper and textile industries, thermal and electric units, fish breeding, zoos, and others. Microscreen filters have high resistance and according to their unique design, have a long life and a minimum amount of wear and damage.
The principle is based on a uniform supporting cartridge with a variable filter cloth for all filter sizes. The filtration cartridge can be installed very quickly without any fastening elements or tools.
Water containing solid particles flows through the inlet pipe or sewer into the centre of the filter drum, solid particles are caught on the inside of the filter cloth and the filtered water flows through the cloth out. The entire filter remains off during this process. The filter cloth slowly becomes clogged by the increasing amount of filtered impurities, which leads to the rise of water level inside the drum as well as in front of the unit.
Once the water inside the drum reaches a certain level (switch-on level), it activates the drum and the backwash pump which pumps the already treated water to the nozzles of the backwash unit. The impurities on the filter cloth are removed by a directed jet stream of water to the sludge channel, from there they flow to the sludge tank. The cloth is thus cleaned and the water level inside the drum drops. The filtration process repeats automatically. The inflow of raw water is not interrupted during the drum cleaning process (during the drum rotation). The water level is monitored by water level probes, see Control of one filter, page 39. The rinsing water (already treated water) is pumped to the nozzles which rinse the cloth on the outside of the drum and thus remove impurities caught on the inside of the drum which then fall to the sludge channel located inside the drum. Sludge is discharged from the channel by gravity to the sludge tank and from there it is either discharged by gravity or pumped out. The operation of the sludge pump is controlled by a water level probe. The ratio of the filter idle time and rotation depends on the amount of impurities flowing to the filter, their character and on the condition of the filter cloth. As the inflow of raw water is not interrupted during the backwash and backwash water is taken
directly from the filter unit, there is no need for additional water tanks for backwash or sludge water which leads to great reductions in initial costs. As the filter switches on and off automatically, it minimizes electrical consumption and rinsing water consumption, enhances average quality of treated water, increases density of sludge discharge and prolongs the life of the whole unit.