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Wahaso uses a proprietary ultra filtration system for processing greywater from showers and sinks. We believe that ultra filtration offers significant advantages over conventional water treatment methods.
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Sand filtration was considered to be the state-of-the-art method in the world of water treatment for many hundreds of years. Similar to natural water cycles in which water flows through layers of rock and sand, this method involves trickling the water through beds of sand in order to clean it. It was truly a revolution in its time and continues to be the principal method of water filtration in many communities.
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Sand filtration has some distinct disadvantages. Just because water is clear, it is not necessarily free of contaminants that could be harmful. Sand filtration is typically effective to a filtration level of around 10 microns (see filtration chart following). Pathogens, bacteria, and viruses can break through sand and particle filtration into the filtered water supply. Also, as the sand traps particles, a “filter cake” forms on the top of the sand, making it less efficient and reducing the quality of filtration. Back washing the sand restores the filter’s quality, but this frequent step wastes a significant amount of filtered water – as much as 25% is sent to the sanitary sewer.
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This chart show the particulate range for many types of contaminants and the types of filtration that can be extracted using ultra filtration. Ultra filtration is only surpassed by nano-filtration and reverse osmosis in its ability to capture and remove very small contaminants from water. To see the full spectrum chart and other filter technologies in a PDF document,
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Ultra Filtration Membrane Technology offers a significant advance in filtration technology. There are now numerous applications where ultra filtration can replace or effectively supplement sand filtration. Ultra Filtration achieves better results in filtering out pathogens, is more efficient in total clean water produced, takes up significantly less space, and is renowned for being easy to manage and simple to integrate into complex water treatment systems. Ultra Filtration will effectively filter out pathogens, viruses, and bacteria to 0.02 microns or better. When combined with chlorine pre-treatment, Ultra Filtration will provide pathogen free water.
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An important advantage of Ultra Filtration is its ability to deliver clean water regardless of the system load; the filtered water will always maintain the same high level of quality and purity. Sand filtration simply cannot match this result.
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Wahaso's greywater harvesting systems are engineered to meet the rigors of commercial and institutional use. Our Ultra Filtration Systems are designed for fully automatic operation. Wahaso provides a PLC-based control system that monitors the process and automates the various operating modes of the ultra filtration process: filtration, cleaning, and back washing.
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To learn more about how greywater harvesting might be used in your building project, please
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In the ultra filtration process, water is forced through membrane tubes that remove contaminants as small as .02 microns in size - smaller than that of bacteria and viruses. |
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