Influence of ozonation and coagulation as pretreatment steps for ultrafiltration in advanced wastewater treatment.

Influence of ozonation and coagulation as pretreatment steps for ultrafiltration in advanced wastewater treatment.

Within this research project different treatments (ozonation, coagulation) of secondary effluent and the fouling behavior during subsequent ultrafiltration were investigated at labscale. Coagulation with 4 mg Fe3+/L leads to a significant removal of fouling resistance and moreover pre-ozonation up to a dosage of 15 mg O3/L can clearly enhance the filtration process. In contrast rising ozone dosages produce more hydraulically irreversible fouling. The subsequent coagulation can only compensate ozone-induced stronger irreversible fouling to some extent.