Abstract
Removal of nutrients from blackwater is essential before discharge into the water bodies to avoid harmful anthropological or environmental manifestations. In the present study, two membrane-divided electrochemical cells in series were employed for simultaneous removal of ammoniacal nitrogen (TAN) and orthophosphates (TP) from blackwater and wetland-treated blackwater. The parameters optimized were hydraulic retention time, flowrate, and current density. The highest TAN and TP removal achieved for blackwater at 16 Am−2 was 63 ± 2% & 39 ± 2%. TAN and TP recovery was 88 ± 0.1% and 60 ± 10%. TAN and TP removal rates were 78.07 and 12.7 g m-2d-1, while the recovery rates were 68.44 and 7.56 g m−2 d-1. The energy consumption was 5.4 ± 0.1 WhL-1. The treatment and nutrient recovery process was demonstrated in the long-term (7 days) to estimate the scalability and field applicability. The recovery solution post long-term experiment showed a low concentration of nutrients. Simultaneously, the anionic membrane showed ion transferability losses and physical damage limiting the scale-up and field application.
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