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Base filtration BIOCON systems are filtration modules and units. They
differ, mainly, by their scale indexes (dimension and weight). The filtration
module consists of cylindrical housing with the end flanges made from stainless
steel. Inside of the housing ceramic filter elements or roll membrane elements
are inserted. In the module hermetic sealing of filter elements is made on the
end flanges using rubber rings. For filtering medium feed, filtrate and
concentrate removal there are nipples and nozzles in the housing and on the
edge flanges of the filtration module. A filtration unit consists of one or
several filtration modules, circulating centrifugal pump, feeding pump, heat
exchanger, inlet and outlet collectors, base frame, valves, auxiliary tank
(when necessary), connecting armature, power panel and control system. The
filtration unit is designed by a principle of circuit loop to make a condition
of cross-flow filtration. Liquid for filtration moves in the unit by feeding
pump. Inside the unit the liquid for filtration under circulating pump is
continuously pumped through the flow circuit formed by several filtration
modules, heat exchanger and circulation pump, that are connected in series (for
ceramic membranes) or connected in parallel (for polymeric membranes). Part of
liquid and particles, which size is less than pore size and passed through
membrane surface under pressure of (0,5 – 5 bars) and continuously removed from
the unit. This part of liquid is named as permeate. Constant supplying with new
liquid and filtration fills up the deficiency of liquid in the unit. The
particles, which size is more than pore size, are retained by selective layer
and collected inside the flow circuit. This part of flow is named as
concentrate. The deposit formed above a membrane, is continuously washed off by
a circulating flow, which rate makes 4-7 m/sec for ceramic membranes and 1-1,5
m/sec for polymeric membranes.
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