Tailor–made water filtration solutions for challenging industrial, municipal and irrigation needs. Our specialized systems are designed to effectively treat and filter the water according to our customer's specific requirements. Over the last 5 decades, Amiad Water Systems has developed a range of compact, automatic, self-cleaning filters incorporating innovative technology.
Fast, Efficient Self-Cleaning Technology for Continuous Flow of Filtered Water
Amiad's greatest achievement is its research, development and the production of suction-scanning screen technology. Presently, Amiad is the only water filtration manufacturer to offer this technology to the market. This breakthrough has led to the design and production of self-cleaning filters with screen areas that were previously unattainable. Suction-scanning screen technology combines focused flush with automation to provide 100% cleaning of the screen area. The success of this technology has established Amiad as a global leader in providing water filtration solutions.
Amiad suction-scanning screen filters incorporate a unique multi-layer stainless steel screen available in degrees of filtration as small as 10 micron. Amiad's engineering team has developed the optimal combination of material strength; filtration efficiency and clean-ability by combining select ratios of screen weave type and patterns, resulting in a high efficiency of filtration. This sophisticated screen assembly allows the accumulating filter cake to be rapidly and totally removed. Amiad's suction-scanning screen technology uses less than 1% of the total process water for cleaning. This is the lowest ratio of process to exhaust water of all competing automated self-cleaning methods. (This ratio can vary depending on specific application conditions).
The self-cleaning cycle is triggered by the accumulation of suspended solids (filter cake) on the screen surface, as measured by the pressure differential. Therefore, cleaning is performed "as needed" - resulting in minimal water and energy waste. Suction-scanning technology eliminates the need for isolating the filter during the self-cleaning cycle. This focused cleaning and the minimal exhaust requirement allow for uninterrupted process flow.
Textile fibers are widely used for fine filtration in the disposable cartridge filter market. The Amiad AMF filter uses fiber thread technology to create a self-cleaning filter system. The basic filtration element in a microfiber filter is the thread cassette. Fine threads, which are 10 micron in diameter, are wound over a rigid grooved base plate. Water flows through the thread layers into the grooves and channel the water to specially designed outlets. The rigid base plate supports the thread layers and also plays a major role in the cleaning process of the media. The filter cassettes are mounted on hollow collector pipes.
The cleaning mechanics
High-pressure water jets spray through the thread layers hit the grooved base plate and reject back through the layers again. The contaminant is carried off the cassettes by the reject stream. Therefore, no dirt passes through the filter during back-flush. The filtration mechanics are a combination of surface and depth filtration. The design velocity through the media is 1-40 m/h. The newly developed filters is efficient for Drinking Water filtration, including the removal of Cryptosporidium, as well as for Swimming Pools, Reverse Osmosis protection, Cooling Tower side stream filtration for Legionella reduction, etc.
The cleaning process
The filtered water flows from the four collector pipes to the filter's outlets. As dirt builds up on and in the cassettes, the pressure differential across the cassettes increases. When the differential pressure reaches a pre-set adjustable level, it triggers the filtration system's flush sequence. Flush sequences also can be triggered at pre-set timed intervals. The flush sequence is governed by an electronic control unit or by manual input.
These elements are constructed from plastic discs that are stacked onto a telescopic core. The discs are grooved on both sides. These grooves intersect to form the filtration element when compressed on the core. Disc filters are surface & depth filteration. The disc element provides especially effective retention of organic matter. The effective filtration area is comprised of both the outside surface and the channels formed by the intersected grooves. Suspended organic particulate adheres to the grooved surface. Cleaning the cartridge is made simple by the unique design of the telescopic core, which allows the discs to separate during the cleaning process. Disc elements are available for use with 1"-3" Amiad plastic filters and 2"-4" Amiad steel filters.
Pressurized sand media filtration is the traditional and most common technology, yet significant knowledge and experience are required in order to provide highly efficient systems.
The filtration experience gained at amiad allows us to approach this market with the ability to design, install and commission a wide range of complex systems.
Filtering with media filters is also recognized as depth filtration. The media filters perform the filtration of water through a thick layer of graded particles. These particles can be sand, gravel or other granular materials. The filtration rate depends on the effective size of the bedding and the water velocity through the filter.
Amiad offers a complete line of manifolds, accessories and control systems for single or multiple media filters. The Amiad Customer Support Department is at your service in designing complete media filtration systems with gravel, sand, active carbon or multi-layer beddings: for manual or automatic operation, for single or multi-units, manifolded for complete filtration solutions.