I recently had success in ...

I recently had success in filtering a very difficult-to-settle & dilute (400 ppm) suspended solid (humate) in the effluent from a heavy mineral sand processing plant in Georgia, USA.  The process is a sloping sand bed (as opposed to a typical horizontal sand-filed filter) - its design was based on a process used for dewatering very fine grained mine tailings.  I posted the PowerPoint presentation on Research Gate and attach the abstract for your consideration below.  The presentation shows photos of a very simple bench testing apparatus that could be fabricated for less than $US100.  The process should work on ground water containing trace amounts of dissolved and suspended iron and manganese, too.  Good luck.  J. Gusek