DENITRIFICATION OF DRINKING WATER BY USING PROBIOTIC BACTERIA

Abstract

Aim. The study of the efficiency for the drinking water purification from nitrates with the help of probiotic bacteria Bacillus subtilis, B. licheniformis, as well as Lactobacillus acidophilus, L. bifidus, L. bulgaricus and Streptococcus thermophilus, being a part of the drug preparations. Methods. Microbiological, chemical, physicochemical, gas-chromatographic, statistical. Results. It is shown that the slow (0.1 m*h-1) filtration of water with contents 300–500 mg*l-1 of nitrate through grains of sand and activated carbon or the chemical fiber under the pretext of carrier «VIYA» with immobilized probiotic bacteria on them led to the reduction of the nitrate concentration below 2,5 mg*l-1. Ethanol (0.1 ml to each 100 mg KNO3) was added to treated water to support the microbial growth. The denitrification gas consisted of 95–97% of N2, 0,1–0.3% – CO2, sometimes C2H4 (<1%), and (2–3%) – H2O and did not contain H2, CH4, H2S. Conclusions. The possibility of potable water purification from nitrates in excess concentration with the help of probiotic bacteria is established.

Keywords

• питна вода
• нітрати
• пробіотичні мікроорганізми
• пробіотична денітрифікація