Abstract
AbstractThe influence of CO2 addition and feeding regime (continuous versus semi-continuous) on the removal of Pseudomonas aeruginosa, Clostridium perfringens, Staphylococcus, Enterococcus faecalis, and Escherichia coli from three shaded High Rate Algal Ponds (HRAPs) treating primary domestic wastewater (PDW) was studied. The three HRAPs were operated at similar hydraulic retention time of 5 days and shading of 50%. The CO2 addition and feeding regime had no statistically significant influence on the removal of Pseudomonas aeruginosa, Clostridium perfringens, Staphylococcus sp., and Enterococcus faecalis, removing 2.39–3.01, 2.07–2.31, 3.02–3.38, and 3.14–3.45 log units, respectively. On the other hand, only the removal of Escherichia coli decreases significantly at a semi-continuous feeding regime of 0.1 h d−1, 2.23–3.29 log units. The productivity and the settleability have been significantly improved at the semi-continuous feeding regime and the CO2 addition, producing 3.94–5.93 g m2 d−1and settleability of 31–36%.KeywordsDisinfectionDomestic sewagePathogenic indicator organismsScrubbing Clostridium perfringens Staphylococcus sp.
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