. Abstract 22The effect of hydraulic retention time (HRT) and seasonality on the removal efficiency of 26 23 organic microcontaminants from urban wastewater was studied in two pilot high-rate algal ponds 24 (HRAPs). The targeted compounds included pharmaceuticals and personal care products, fire 25 retardants, surfactants, anticorrosive agents, pesticides and plasticizers, among others. The pilot 26 plant, which was fed at a surface loading rate of 7-29 g of COD m-
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