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Ultrafiltration reduces turbidity without chemicals while also removing viruses, cysts, bacteria and contaminants
With the latest advances in the membrane technology — ultrafiltration — it’s possible to take control of spring flooding conditions that can turn drinking water a mud colour. An ultrafiltration unit integrated into your plant’s existing facility has the benefit of reducing turbidity by filtering colloidal particles (0.002 to 1.0 microns) and some of the largest dissolved contaminants. Ultrafiltration provides a minimum 4 log removal of viruses, cysts and bacteria without chemicals, tested against US EPA Standards. Turbidity is reduced so that the downstream UV-systems can function efficiently.
Ultrafiltration results in a reduced need for chemicals such as coagulants, flocculates, disinfectants and/or pH adjustment. It is a natural size exclusion filtration instead of media depth filtration. UF produces a good and constant quality of treated water in terms of particle and microbial removal without chemicals.
Ultrafiltration is not fundamentally different from reverse osmosis, microfiltration or nanofiltration, except in terms of the size of the molecules it retains. UF membranes will come in different pore sizes, which determine the type and size of contaminants removed.
The ultrafiltration unit has a small footprint and plants are compact with simple automation that is easy to maintain. BI Pure Water’s ultrafiltration setup allows full control over all required peripherals to filter water from any source, waste to well-water.
Automated Membrane testing
Monitoring the signal of a turbidity meter in the filtrate line of the system provides indirect testing of the membrane. The PLC will also trigger the integrated, direct membrane-test.
Treats difficult water
The system is designed to withstand fouling and automatically applies membrane cleaning. Money and time is saved on replacing cartridge filters. The degree of fouling of the membrane is continuously measured based on the function of flow and differential pressure. The ultrafiltration unit automatically reacts to varying feed water conditions and adjusts the frequency of its cleaning cycles accordingly. In addition to a feed-pump it also controls dosing equipment in the feed to be able to treat high-color-containing sources using an inline-flocculation-process. This achieves the highest possible flow rates at maximum rates of removal of color and dissolved organics.
Once the system detects a need for cleaning, it can apply different combinations of cleaning techniques, including pre- and post-flushing, internal backwash or backwash powered by an external pump. Cleaning-In-Place can be performed automatically; for example two different chemicals in sequence can be applied to allow for high- followed by low-pH cleaning steps, to get the system back to start-up conditions.
Remote monitoring and alert system
As soon as the system detects an operating error, including a failed membrane-integrity test, or other differentiated message, e.g. unsuccessful cleaning sequences, water hammer or an empty cleaning chemical tank, it can send out an SMS message to up to ten cell phones or report to an existing remote monitoring system. If the unit is hooked up to an existing cellular network through its internal high speed-modem (optional), latest web-based, remote-control solutions allow the user to access the unit over the internet, change operating parameters and read operating history from the datalogger.