Decanter vs. Screw Press
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DECANTER CENTRIFUGES & PLANTS FOR SOLID/LIQUID SEPARATION DECANTER VS. SCREW PRESS A COMPETITION WITH A CLEAR WINNER Dry substance content in the sludge: Improvement of +5% DS (absolute) with a solids capture efficiency of ≥ 99% are repeatedly achieved and proven with HILLER high performance decanter centrifuges. Many operators of municipal wastewater treatment plants are faced with unnecessarily high sewage sludge disposal costs due to the dewatering technology applied. However, the dewatering result can almost always be optimized and the disposal costs thus be reduced. A large number of tests with our mobile plants show a considerable savings potential through the use of decanters in comparison with competitor technologies. These practical experiences from the direct comparison tests show clear advantages for the centrifuge technology not only in the area of throughput and dewatering performance but also in the separation result of the liquid phase. Separation efficiencies of only 90 to 95% lead to correspondingly high back-loading values for the wastewater treatment plant, which have the effect of a continuous accumulation of fine particles in the wastewater treatment plant system. For this reason, operators decide in favour of modern decanter technology after a well-founded technology comparison on their own plant. A comparison that we can recommend and offer before making such a long-term decision. With very manageable effort, you can quickly see the amount of operating cost savings that can be achieved, and a high degree of separation also provides procedural advantages for your entire wastewater treatment. separation & process

DIRECT COMPARISON SCREW PRESS DEWATERING RESULT (Largest economic factor influencing annual operating costs) SEPARATING EFFICIENCY MOBILE TEST PLANTS OPTIMISATION FRIENDLINESS ECONOMIC EFFICIENCY POWER CONSUMPTION Up to 5% DS (absolute) better dewatering result Stable >99% No centrate water aftertreatment required Clear disadvantages, especially for sludge with „difficult“ dewatering properties, e.g. winter sludge On a daily average, taking into account the regular screen cleaning cycles, only 90 - 95%, resulting in considerable backloading with fines. Necessary post-treatment of the...