Ultrafiltration is a membrane process with pore filters with a cut point of 0.1 to 0.01 μm. Dirt particles and turbitities (also germs) are retained by the pores. Plant technology uses the existing supply pressure. The water to be purified is completely passed through the membrane (dead-end filtration), the dirt attaches to the membrane. The transmembrane pressure increases as long as the backwash is triggered with filtrate and the membranes are cleansed again.
For more effective cleaning, the backwash is supported by chemicals (CEB = Chemical Enhanced Backwash). The result is a permanently defined water quality with a filtrate yield of 90 - 95%. The ultrafiltrate serves as a supply for a downstream water treatment.
Depending on the dirt load in the raw water, disc filtration and/or flocculation or precipitation might be required before ultrafiltration. This is why Herco recommends experimental testing with an especially designed pilot unit before planning a major project. The final installation is then planned on the basis of verified insights from the pilot phase. Herco supplies turnkey equipment that can complement existing water treatment units. Our water treatment experts will gladly consult you and help with the layout of your installation.