protection during storage and transport
Preventing the ingress of extraneous organisms can be achieved by minimising the
head space in storage vats and transport tanks and by ensuring that sterilising filters
from the BIO-X and TETPOR families are fitted to tank vents and compressed gas inlets.
Blanketing the head-space with an inert gas (usually carbon dioxide, but also nitrogen
is used) minimises the risk of aerobic microorganisms propagation.
Sulphur dioxide is commonly used to microbiologically stabilise the wine during
storage and packaging. It also acts as an oxygen scavenger. However, even at low
levels, sulphur dioxide may result in flavour taints. Filtration using PREPOR PP or
PREPOR GP filter cartridges reduces the risk of microbiological spoilage of the wine.
This can mean that the use of sulphur dioxide could be reduced or even eliminated. The
high removal efficiency of the cartridges provides removal of yeast and significant
reduction of bacteria. For very stable wines, particularly fortified wines, these
stabilising filters can provide a bright, yeast-free product. For wines that are more
susceptible to microbiological spoilage, the filters can be used to remove most of the
microbiological loading prior to terminal microbiological stabilisation using a
microporous membrane.
Due to their microporous depth characteristics, they also improve the filterability index
of the wine, protecting downstream membranes from premature blockage due to low
levels of colloidal content. In particular, PREPOR PP which can be repeatedly
regenerated with hot water, steam sterilised and chemically cleaned can be used as an
alternative to sheet filters and provides an effective means of standardising
filterability.
- Removal of yeast and reduction of bacteria prior to wine bulk
storage or tanker transportation.
- Filterability adjustment and standardisation of incoming wine
deliveries.
- Colloid reduction or removal.
- Yeast removal and reduction of bacteria prior to microporous
membrane filtration.
Prepor GPPREPOR GP is a new prefilter that combines the strength of polypropylene with the microbial retention of glass fibre for demanding applications such as long term exposure to steam, high differential pressures or aggressive chemicals.
Prepor PP BevPREPOR PP filter cartridges will significantly reduce numbers of yeast and spoilage organisms from beverage products, to provide extremely cost effective microbial stabilisation.
