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Badania wpływu wstępnego odgazowania wody na usuwanie azotanów w procesie denitryfikacji siarkowej

Hiszpańska A., Małek R., Apolinarski M.

Ochrona Środowiska

2001

nr 4

41-43

The removal of nitrates from water via sulphur denitrification on sulphur-limestone beds was investigated by laboratory tests. The efficiency of the process was related to various loading of the bed and varying time of water/bed contact. Particular consideration was given to the influence of deaeration on the treatment effects and on the quality of the water leaving the treatment system. Comparisons were made for treatment efficiencies obtained with and without vacuum deaeration, and with the use of chemical deoxidizers. No clear relationship was found to occur between oxygen concentration (up to 3 gO2/m[3] ) in the feed water and the efficiency of the sulphur denitrification process. The removal efficiency for nitrates remained high (90 to 98%) even after the value of 3 gO2/m[3] had been exceeded. There was a distinct correlation between the efficiency of coloured matter and turbidity removal and the application of pretreatment. Colour and turbidity of the treated water were the highest when the raw water was not pretreated by deaeration. Pretreatment by deaeration had a favourable effect also on the bacteriological quality of the treated water.