WATER & EFFLUENT TREATMENT
residual water content of the sludge amounting of more than 80 %. Once the sludge load in the drum has reached about 22 kg , the sludge can be easily removed by simply extracting the sludge basket out of the drum and dumping the sludge into a waste container .
Alternatively , in fully automatic centrifuges the sludge can be removed from the centrifuge drum with a stationary peeling knife . During the separation cycle this peeling knife is positioned in the center of the drum . For sludge peeling mode the knife moves slowly towards the drum wall by way of a pneumatically activated linear guide . The peeled out sludge falls into a container placed below the centrifuge drum . This peeling knife
The semi-automatic cleaning centrifuge RZ 120 M-V at Hannex is equipped with a movable base so that it can be easily moved to different locations at the company .
Once the sludge holding capacity of 22 kg has been reached , the sludge basket can be easily removed from the drum of the semi-automatic centrifuge . arrangement prevents any additional load on the bearings of the rotating drum . After completion of the peeling cycle the drum is automatically rinsed out for removal of any residual sludge deposits , which , during the subsequent cleaning cycle could cause an imbalance with the risk of premature bearing failure .
The cleaned process water , now free of paint particles , is fed back into the process with a special water collection tube .
Quick amortisation combined with high cost savings
Because of its small footprint Hannex decided to purchase a semi-automatic centrifuge . The RZ 120 M-V is equipped with sophisticated controls and a process water and clear water tank . It is not only easy to operate and maintain , but because of its placement on a movable base , it can be easily utilised at the different collecting tanks . Krzysztof Iwanicki explains : “ The centrifugal cleaning process is so effective that we no longer need any coagulants and flocculants for supporting the separation of the paint particles from the water . We could also eliminate all the other chemicals for stabilising the process water in the collecting tanks . As a matter of fact , we are only using chlorine for disinfecting the reclaimed water coming out of the centrifuge in crystal clear condition ”.
But the savings by no longer having to use chemicals are not the only reason for the substantial cost reduction . Because of the drastically decreased residual water content the amount of paint sludge that must be disposed of has become a lot smaller . And finally , a lot less fresh water is required for the collection of the overspray paint mist . Krzysztof Iwanicki concludes : “ The centrifuge has been in operation since 2016 . It amortized itself already within the first year . And we could reduce the operating costs for paint sludge removal by roughly 70 %. Beginning with the second year of operation our annual cost savings increased to 89 %”.
Besides the sizable cost reduction Krzysztof Iwanicki is also very pleased with the much lower consumption of resources and the positive effect on the environment . This undeniable success prompted him to purchase a second centrifuge for cleaning the water that is used for the general cleaning of the paint booths at Hannex .
For over 80 years the privately owned Rösler Oberflächentechnik GmbH has been actively engaged in the field of surface preparation and surface finishing . As global market leader we offer a comprehensive portfolio of equipment , consumables and services around the mass finishing and shot blasting technologies for a wide spectrum of different industries . Our range of about 15,000 consumables , developed in test centers located all over the world , specifically serves our customers for resolving their individual finishing needs . Under the brand name AM Solutions we offer numerous equipment solutions and services in the area of additive manufacturing / 3D printing . Last-but-not-least , as our central training center the Rösler Academy offers practical , hands-on seminars to the subjects mass finishing and shot blasting , lean management and additive manufacturing . Besides the German manufacturing locations in Untermerzbach / Memmelsdorf and Bad Staffelstein / Hausen the Rösler group has a global network of 15 manufacturing / sales branches and 150 sales agents .
For more information please go to : www . rosler . com
58 APRIL 2021 twitter : @ surfaceworldmag