Design improvement optimizes this vacuum drum filter
TriStar Ltd.
This company has improved its Pre-Coat Rotary Vacuum Drum Filters (RVDF) with the introduction of the EDG-trac Knife Advance System (photo). It is designed to improve filtration performance and reduce energy costs. Ideal solids penetration into a pre-coat filter is two to five thousandths of an inch. The EDG-trac system removes as little as 1.4 thousandths of an inch per revolution, at a drum speed as low as 0.2 rpm. This helps to extend the pre-coat life by not cutting away clean pre-coat while maintaining acceptable solids separation and improving liquid throughput, says the company. An efficient, single motor with variable frequency drive (VFD) reduces energy use and cost, while fully automated PLC controls provide precise control and critical information for operators. The company is offering retrofits of existing units (at the owner’s facility, or at the manufacturer’s facility). Independent testing of a recent installation showed that the EDG-trac system was able to increase filtration throughput by 700% and reduce energy consumption by 87% on a per-gallon filtered basis, says the company. — TriStar Ltd., Buffalo, N.Y.