Environmental

The Sefar product range is dedicated to filters using cooling fluids in the metalworking, steel mills and automotive industries, no matter if it is emulsion, oil or wash water. The main advantage of Sefar filter fabrics, compared to traditional media, is the possibility of keeping filter efficiency and the average flow rate at extremely high levels.

By using Sefar filter belts, perfectly purified coolants provide a very good surface finish and a longer tool lifetime. Compared to paper filters or nonwovens, endless filter belts can improve the ecological footprint, increase sustainability, reducing waste costs and quantity. Last, but not least, security filters using bags.

To test the technical cleanliness of the final metal work piece according to VDA 19 and ISO 16232, as well as, the quality of the oil and emulsion (ISO 4406), Sefar offers 5 µm mesh filter and other filter membrane types. These tests take place in a clean room, for which Sefar supplies filter mesh to improve the air flow behavior of the laminar flow roofs.

Low-pressure belt filter (UDF), suction belt filter (SF/ HSF), pressure belt filter (HKF/ DBF/ PBF), hinged belt filter, vacuum belt filter, rinsing cabinets, filter nipples, candle filters, control filters, filter presses

Our products meet the specific needs of these filtration applications and are successfully running all over the world on all known equipment brands and OEMs, such as:

In order to use it in the construction industry, the FGD gypsum is dewatered on a belt filter (VBF) to a low residual cake moisture of below 10%. Sefar belts are ideally suited for this continuous gypsum dewatering process.

Years of experience in the production of fabric filters, in the form of a double-layered fabric (DLW), enable customers to meet the high demands on low residual cake moisture, while simultaneously achieving excellent cake discharge and belt cleaning properties. In addition to the use of filter belts, drum filters or centrifuges for the dewatering of gypsum are also used. Sefar filter belts have proven themselves thanks to their excellent drainage, low residual cake moisture, good cake discharge and long service life.

The resulting fly ash slag must be washed and dewatered to reduce the amount of heavy metals. Like in the FGD gypsum production, belt filters from Sefar are used for this purpose. These modern facilities, also known as W2E or WTE, convert 'Waste into Energy'. As in coal-fired power plants, toxic flue gases are produced during combustion. The resulting slag must be filtered from any heavy metals on belt filters as in the FGD gypsum dewatering. Fabric filters from Sefar are used for this purpose. The proven double-layer structure (DLW) enables optimum filtration performance on vacuum belt filters (particle retention, washing and draining) while maintaining high stability. Depending on the system, further process steps on candle filters with filter bags or filter presses with filter cloths can be carried out in order to recover and reuse valuable substances such as zinc from the slurry.

Belt filter (VBF), centrifuges, candle filter, drum filter, filter press

Our products meet the specific needs of these filtration applications and are successfully running all over the world on all known equipment brands and OEMs, such as:

Municipal or industrial companies are faced with the challenges of finding cost-efficient solutions with simultaneously increasing demands for wastewater treatment – whether it is detoxification, draining and drying of sewage sludge, membrane filter presses or belt drying and drainage systems.

Various filter press cloths (single, double or overhang cloth) offer good cleaning capability, fast drainage and long cloth life in addition to optimal cake discharge. Especially when using fully automatic membrane or chamber filter presses, the choice of fabric, i.e. the choice of filter material, the fabric weave, the throughput rate is essential to guarantee smooth operation and low costs. Modern sewage treatment plants do not only perform primary and secondary filtration, but also clean the water in a tertiary filtration stage – whereby a separation of solids and liquids takes place in the microfiltration area. Filters with up to 5 μm fineness remove tiny particles from the water. This creates the optimum conditions for a further process step as a preliminary stage for membrane filters or avoids environmental pollution and keeps micro-plastic waste out of the environment.

There are additional challenges in the areas of drinking water, process water treatment or reuse, i.e. the recycling of process water. The proportion of fines in the filtrate must be as low as possible; good cleansing of the product or a clear separation of solids in the slurry must be achieved. Different filters are used depending on the process step and application: from candle filters, especially with low solids content, to leaf filters for large throughputs, reverse osmosis filters for the separation of very fine particles, or drum sieve or disc sieve filters. Sefar offers a wide range of different materials and finishes for various applications – from screen fabrics with different degrees of opening and crossflow, to monofilament or multifilament filter cloths for very fine to very coarse particles, filter membranes, segments, prefabricated filter elements, filter discs or round woven tubes, from polypropylene (PP) to polyester (PET) to PVDF, PEEK or other special filters.

Filter presses, membrane filter presses, chamber filter presses, disc filter, drum filter, candle filter, vacuum belt dryer, sieve filter, reverse osmosis filter, membrane filter

Our products meet the specific needs of these filtration applications and are successfully running all over the world on all known equipment brands and OEMs, such as: