Winegrowers Supplies - Crossflow filters, for wine or cider clarification, and many other applications
In a classic filtration the liquid filtrate passes through the filter surface only in a perpendicular way. In a crossflow filtration, where the filter-surface is a semi-permeable membrane, the liquid passes through the membrane and also across the membrane and thus keeps it clean of residues. According to the size of the membranes pore size this can be referred to as microfiltration, ultrafiltration, nanofiltration or reverse osmosis.
A low-pressure process for the retention of suspended material particle size of 0.01 microns or larger.
Smaller particles (salts, sugars and proteins, for example) pass through the membrane. Typical operating pressures range from 5 to 45 psi (0.34 - 3 bar).
In conventional filtration the feed flow is perpendicular to the membrane surface, which causes a buildup of debris that eventually reduces fluid permeation.
In crossflow filtration, flow is tangential to the membrane surface resulting in a continuous scouring action that almost eliminates formation of a membrane fouling layer from feed-stream debris and macro molecules.
Driven by pressure in the filtration modules, part of the liquid passes through the membrane. This fraction is called "permeate" or "filtrate," while the fraction that does not pass through the membrane is called the "retentate" or "concentrate".
The end product may be:-
- the permeate, as in fruit juice clarification or effluent purification,
- or the retentate, as in the concentration of antibiotics.
In some cases, both streams permeate and retentate will be valuable end products.
Depending on the size and type of the particles or solutes contained in the feed stream, there is a wide range of separation processes available.
Single filtration of raw products.
Production of wines with residual sugar.
Prevention of malolactic fermentation.
Improvement of tartrate stability.
Filtration of sparkling wines.
Recovery of second pressings.
Continuous running 24 hour filtering cycles.
Reduced labour automatic system.
Constant flow rate predictable processed volumes.
Operational reliability operator mistakes are avoided.
Saving in production costs clarifying substances and filtering aids are not required.
No waiting for clarification in tank fatser tank turnover (fewer tanks needed).
Integral product recovery lowest unfiltered volumes (0.2% of total volume).
Saving in energy about 0.09 kWatt per 100 litres of filtered product.
Economic cost is about 0.18 Euros per 100 litres of filtered product.
Note: the crossflow filter is not suitable for filtering liquids containing a lot of solid particles. It should be used only after an clarifying, pre-filtration etc.
After the crossflow filtration the juice is completely clear, at around 0.2 microns.
I sell the following models, which have a pump installed:-
Model IND-700 (up to 700 litres/hour, 15.3 sqm membrane, 1.2 kWatt/hour, 800 mm x 900 mm x 1600 mmH, 180 Kilos.), 20,450 Euros
Model IND-1300 (up to 1300 litres/hour, 30.6 sqm membrane, 2.5 kWatt/hour, 1000 mm x 1000 mm x 1700 mmH, 280 Kilos.), 33,460 Euros
Double Prefiltration unit at entry, in stainless steel, 352 Euros
Non retentate unit, 415 Euros
Upgrade to Electronic Flow Meter, 990 Euros
Upgrade to electronic process control - touch 3.5", 2,500 Euros
They are all built with DN40 threads, and normally the internal diameter of the hoses must be 40 mm. For the smallest model (IND-700) it's allowed to use 32 mm internal diameter hoses.
For the hose fittings: normally three are needed:-
1) inlet: (in aspiration) cloudy liquid flowing in from the source tank.
2) clear outlet: filtered liquid flowing out, to another tank or ...
3) return outlet: returning unfiltered liquid to the source tank.
In the filtering process, part of the liquid is filtered and part is not filtered, that part normally returns to the source tank.
With the optional 'non retentate unit' the return outlet is replaced with a stainless steel pipe which returns to the inlet (aspiration) side, recirculating the liquid immediately.
It's possible to remove the 'non retentate unit' and fit a hose to return the unfiltered liquid to the source tank.
Normally it's sufficient to rinse well with water, for occasional cleaning: Henkel Ecolab Ultrasil 69 New, 26 kilo pack, 172.00 Euros
Larger/faster models are available, prices on request.
Delivery is normally 4 to 6 weeks.
Prices shown are exclusive of Vat.
Delivery usually will need to be charged at cost.