Siemens Announces Product Enhancements to its Disc Filter

Warrendale, PA – Siemens Water Technologies has announced product enhancements to its Forty-X disc filter, formerly known as the Spider Disc Filter. The tertiary filter disc technology incorporates several new product improvements including a pressure-assisted seal, a trash-tolerant box design, and sliding tank covers.

Forty-X Disc Filter incorporates a proprietary pleated panel design for use in diverse applications such as municipal tertiary filtration, water reuse, and process water filtration. The unique pleated media configuration increases the surface filtration area by 40% and reduces the possibility of media deformation and reaping, as compared to traditional flat panel, woven disc filters.

A new pressure-assisted seal added to the pleated panel's design offers several advantages over other flat panel designs. It eliminates leak points and increases throughput capacity, allowing the filtration panel to sustain and operate at twice the headloss.

After flowing through the disc filter's new proprietary filtration box, trash material is rejected out of the system. This ensures the unhindered flow of water between panels and the proper rejection of plastics, algae clumps, and other floatables.

Siemens added stainless steel sliding covers for increased operator safety. The covers, which enclose the disc/drum's entire internal assembly, make accessibility and maintenance easier.

The Forty-X disc filter uses an inside-out filtration technique. The filtration medium is fed from the inside and the outside of the medium is submerged in filtered water. Solids are deposited on the inside face of the medium, while filtrate is produced on the outside. Backwash is initiated by headloss. High-pressure nozzle spray dislodges accumulated solids, propelling them back towards the inside and collected inside a trough which conveys the rejected solids out of the system by gravity.

The filter medium is a woven polyester cloth with an absolute micron size rating (typically 10 µm for tertiary reuse). This rating ensures that only particles greater than the cloth opening and those greater than the openings of the accumulated layers of solids are retained. The discs are only in filtrate water, making sludge removal mechanisms unnecessary.

SOURCE: Siemens Industry, Inc. - Water Technologies