Datasheet: Siemens Pulsed-Bed Walnut Shell Filtration SystemSource: Siemens Industry, Inc. - Water Technologies
Siemens Water Technologies offers a complete line of products to remove oily contaminants from water. Our newest addition to this line of products is the pulsed-bed walnut shell filter, offering improved technology in walnut shell filtration.
Walnut shell filtration was developed as a more suitable method of filtering free oil and suspended solids in applications where sand filters have traditionally been used. Today, walnut shell filtration is used to treat oil field produced water, refinery wastewater, steel mill direct spray and caster water, ethylene plant quench water, copper concentrate decant and cooling water. In addition, due to the reduction in backwash water volume and reduction in weight and footprint, this new filter is suitable for many off-shore oil production applications.
Principles of Operation
The pulsed-bed walnut shell filter uses a deep bed of 100 percent black walnut shells, which have excellent surface characteristics for coalescing and filtration, plus superior resilience to attrition. The filter's deep nutshell bed (66 in., 168 cm) offers superior effluent quality, longer filtration runs, and greater throughput efficiency.
The filter uses raw process water and gas or air for backwashing, eliminating the need for moving mechanical equipment or external scouring equipment. The filter operates at twice the flux rate of conventional sand filters in the same application, and can remove over three times the amount of solids before needing to be cleaned.