pretreatment for surface water membrane filtration
pretreatment for surface water membrane filtration
(OP)
My interest is in surface water treatment by membrane filtration (nanofiltration).
I am looking for an automatic backwashing prefilter that can remove particle between 10 an 2 microns in raw surface water.
A part from chemical treatment (coagulation/ flocculation …) do you know any other way to remove small particles (less than 10 microns) in surface water?
Thanks!
I am looking for an automatic backwashing prefilter that can remove particle between 10 an 2 microns in raw surface water.
A part from chemical treatment (coagulation/ flocculation …) do you know any other way to remove small particles (less than 10 microns) in surface water?
Thanks!





RE: pretreatment for surface water membrane filtration
Have you measured the SDI of the feed yet?
RE: pretreatment for surface water membrane filtration
I tested multimedia filter, but not efficient enough.
I also tested integrated membrane systems (UF/NF). That's fine, but too expensive for small municipalities.
Conventional treatment system as pretreatment for membrane filtration is also expensive, but the chief problem is chemical wastes management, as small municipalities’ sewage treatment plants don't have enough capacity.
So I am looking for a less expensive pretreatment for a nanofiltration system.
RE: pretreatment for surface water membrane filtration
RE: pretreatment for surface water membrane filtration
RE: pretreatment for surface water membrane filtration
Chemicals improve the efficiency of filtration. You requirments of filtration down to 2 microns using backwashable membranes is possible.
If you need more info, contact me via email.
There are 2 sides of a coin
One is to give, one is to take
Give until it hurts with a smile
RE: pretreatment for surface water membrane filtration
What I want is a backwashable prefilter.
RE: pretreatment for surface water membrane filtration
MMF removes 20 microns and larger with the aid of coagulants and flocculants. Without chemicals, the efficiency drops to more than 100 microns.
Filtering at such low specs definitely need some form of investment. But this investment can provide a consistent and fully automatic operation.
Think about long term cost.
There are 2 sides of a coin
One is to give, one is to take
Give until it hurts with a smile
RE: pretreatment for surface water membrane filtration
Microfiltration, in surface water treatment, can efficiently remove particles much more lower than 20 microns without coagulant. Even some sand filters can remove 20 microns particles without coagulant. I tested one backwashable sand filter, and without coagulant, it can remove 75% of particles larger than 20 microns. I was looking for something thighter, but not membranes.
Anyway, thanks for your concern.