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Anthropogenic Nutrient Solution (ANS, Urine) adds about 75% of the nitrogen and 50% of the phosphorus to domestic wastewater. It is proposed to collect ANS at the source and release it sequentially, so that it arrives all at the same time at the treatment plant where it could be treated separately. The proposed system would have many advantages relative to the conventional technology. A stepwise transition from the conventional to the proposed technology would slowly improve system performance.
Larsen et al. (Thu,) studied this question.