Therefore, feasible, economic and innovative methods are being researched. Among the investigated processes, ozone stands out as a powerful oxidant.
In this application, with an oxygen fed ozone generator, ozone was not used continuously, and it was applied once in 24 hours as a pulse for short periods, taking into account the bacterial doubling times.
During the experiments with the samples taken from the Wastewater Treatment Plant Aeration Tank, ozonation was applied to the sludge once a day for 2, 3, 4 and 6 minutes, and then the sludge was kept in the shaker for 24 hours. TSS*, VSS*, COD* and OCR* measurements were routinely performed in the experiments that lasted for four days. As a result, at the end of this period, the reduction of VSS was determined as 22.6%, 40%, 75% and 84% for 2, 3, 4 and 6 minutes ozonation, respectively.
While the sludge reduction obtained by standard aerobic sludge digestion was 40-50%, the sludge reduction obtained by batch ozonation was over 80%. Again, the reaction time decreased from 20-30 days to 4 days.
E. coli in the ozone-assisted digested sludge also showed that the E. coli in the sludge were completely killed during this period. It has also been observed that no significant amount of phosphorus is released into the environment in ozone assisted air digestion.
*TSS – Total Suspended Solids
*VSS – Volatile Suspended Solids
*COD – Chemical Oxygen Demand
*OCR – Oxygen Consumption Rate
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