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EPA 540-AR-93/513
EPOC Water, Inc. Microfiltration Technology
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EPOC Water, Inc. Microfiltration Technology (1.9M)
ABSTRACT
EPOC Water, Inc. Microfiltration Technology
Applications Analysis Report
EPA 540-AR-93/513
September 1995
EPOC Water, Inc.'s Microfiltration Technology uses precipitation, microfiltration
and sludge dewatering to treat a variety of liquid wastes. The first step
involves the chemical precipitation of heavy metals. Precipitates and
all particles larger than 0.2 microns are filtered through a unique tubular
textile crossflow microfilter (EXXFLOW). The concentrate stream is then
dewatered in an automatic tubular filter press (EXXPRESS). The EXXFLOW
microfilter modules are fabricated from a proprietary tubular woven polyester.
Wastes pumped into the polyester tubes form a dynamic membrane, which
produces a high quality filtrate and removes all particle sizes larger
than 0.2 micron. This technology was demonstrated at the Iron Mountain
Mine Superfund site, Redding, California, in May/June 1992 on metal laden
acid mine drainage. Different alkalis such as Hydrated Lime (Calcium Hydroxide),
Sodium Hydroxide (50% liquid caustic soda), and Magnesium Oxide (MgO)
were used to precipitate metals from the solution. MgO was the most effective
precipitating agent in this demonstration producing no detectable concentrations
of metals in permeate samples as well as producing a filter cake with
30% solids. The filter cake passed the toxicity characteristic leaching
procedure (TCLP) test for metals with leachable levels well below regulatory
limits.
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Posted February 26, 1999
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