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Does anyone know any regulatory in US or Canada recongnize the NF membrane as hygienic barriers for the virus removal?

I am design a WTP to use UF as the pre-treatment of NF Both of them design at 26L/s of influent flow rate. The permeate of UF will feed to a Transfer tank and the to the NF system. Now my question is because The feed rate to the NF is constant rate which is 26L/s as the backpulse and MIT of UF...

I am designing a WTP to use UF as the pre-treatment of NF Both of them design at 26L/s of influent flow rate. The permeate of UF will feed to a Transfer tank and the to the NF system. Now my question is because The feed rate to the NF is constant rate which is 26L/s as the backpulse and MIT of...

We already built the upflow roughing filter and gravity filter tank. So the backwash area are fixed. Bimr, Do you mean that we shall ask the manufacturer to change (enlarge) the size of orifices on the air lateral and the openings on the underdrain system?

Thank you very much for your help When the air go through the blow off valve, is it very noisy? I can't find any two speed blower can supply 1700CFM and 900 CFM. and The cost of VFD control unit for 125 HP motor is almost as same as two sperate blower.

We are designing a WTP including gravity filter and upflow roughing filter. Both of them require the air acour wash we only want to use one air blower to supply the air flow. As the area of the upflow roughing filter is around twice bigger than that of the gravity filter. If we only use one air...