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Innovative Wastewater Technology for Industry and Community
Liquid Filtration Overview The Fibra™ filter can be used in a variety of liquid filtration applications. It is an innovative technology with multiple advantages over existing alternatives. The robust construction is impervious to a wide range of contaminants and the simple design is easily scalable to increase capacity.
The filter comprises an inline fibre bundle within a stainless steel cylinder. In 'Filtration Mode' the liquid flow moves through the cylinder to a point where a flexible compression bladder acts on the fibres to constrict the flow. ( Fig 1. ) Particles are retained in gaps between the compressed fibres; the degree of compression is adjusted by altering bladder pressure. The progressive narrowing of pore spaces between fibres provides significant advantages of low pressure loss and natural grading through size exclusion. Optimisation of bladder pressure and fibre size allows precise control of particle size removal efficiency. How it works - flushing mode The principle disadvantage of membranes and other self-cleaning filters is that once they block up they become difficult to clean. In contrast, the Fibra™ process has a fast, efficient and fully automated 'Flushing Mode'. During flushing the bladder pressure is removed to open up the fibres and solids are transferred to waste. ( Fig 2. ) The flushing sequence typically takes 5 - 10 seconds and uses a small quantity of feed flow. Immediately afer flushing the bladder pressure is re-established and the filter is back in service. The Fibra™ filter can be used to create micro bubbles* for use in a number of applications when injected gas can be passed through the fibre bundle. These applications include gas-liquid contacting/transfer, aeration and the use of the unit as a diffuser. When the gas bubbles pass the compression point, the increase in partial pressures in the gas gives efficient molecular exchange between the gas and the liquid. The result is an exceptionally efficient low-energy process with a very slow rate of micro-bubble dissipation. Combining as it does high deposit capacity with low energy requirements, the Fibra™ filter requires no consumables other than electricity. Mounted on a durable and robust frame ( Fig 3. ), the filter is supplied complete with all of the necessary instrumentation and control equipment ( Fig 4. ). Working capacity The duplex 10cm. diameter unit is rated to treat up to 1.5m3/h water flow. The duplex 17cm unit filters a maximum of 5m3/h. The filtration technology can be easily scaled to meet increased throughput requirements and custom installations designed and built. * Micro-bubbles can further enhance performance in:
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