AVITO^® crystal Water Disinfection

Performance

The D-9 test shows an extreme test for which wastewater from a smeltery was injected with laboratory-grown E. coli bacteria at 120 CFU/ml and Enterococci at 420 CFU/ml.

Thus, the wastewater presented a contamination of E. coli = 640,000 CFU/ml and Enterococci = 370,000 CFU/ml.

This highly contaminated wastewater was then treated in the desinfection unit in a single discharge with different process settings (current densities [mA/cm2], flow rates [L/h]).

No fecal bacteria could be detected in the wastewater after the treatment with the different process settings.

The column “PA” of the illustration at the left shows the contamination of smeltery wastewater with the fecal bacteria E. coli/Enterococci.

This wastewater was treated with the Dez-i-Des-100 directly in the clarification plant effluent at flow rates from 20 L/h to 150 L/h. The fecal bacteria were reduced to zero in all the discharges.

The total bacteria count in the wastewater was 690,000 CFU/ml, which was reduced to 116 CFU/ml at a flow rate of 20 L/h and to 670 CFU/ml at a flow rate of 150 L/h with the Dez-i-Des-100. This bacteria count almost fulfils the requirements for potable water, for which the Austrian Potable Water Regulation stipulates a maximum bacteria count of 100 CFU/ml.