WATER CONDITIONING FOR FOOD INDUSTRY USES
RAISA NASTAS , V.RUSU, T.LUPASCU, LUDMILA STARIS, MARIA SANDU
ABSTRACT. – Water conditioning for food industry uses. Tap (drinking) water from
many localities of Moldova doesn’t always correspond to the “Sanitary standards
for drinking water quality” or to the requirements of the “Regulation for
non-alcoholic beverages”, requiring the need for additional purification/
conditioning. This paper presents research regarding the removal/adsorption of
the main pollutants in tap water (iron, manganese, aluminum, humic substances,
trihalomethanes) on supports of local carbon adsorbents made from vegetable
products (stones of peach and plum, walnut shells). Experiments were performed
in dynamic conditions in columns of carbon adsorbents. As work solutions was
used tap water where pollutants have been introduced in amounts equivalent to 3
maximum allowable concentrations. Carbonaceous adsorbents used for
removal/adsorption of pollutants in dynamic conditions, reveal a capacity of up
to 1:400 volumes adsorbent: solution before breakthrough. Combined filter,
utilizing active carbons, was constructed and tested for conditioning of tap
water for beverage and food production. The results demonstrated efficient
remove of organic substances and heavy metals by filtering of about 700 volumes
of water per volume of filter.
Keywords: drinking water quality, active carbons, absorption, organic
substances, heavy metals.