Ultrafiltration (UF) retains ...

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Ultrafiltration (UF) retains only solids. All soluble pollutants including organics, ammonia and other minerals will just pass through the UF membrane.

If the river water has high ammonia levels then it is strongly polluted (0.5 ppm free dissolved ammonia NH3 kill fish) and also the level of dissolved organics and other oxidizable compounds is likely to be (very) high as well (please verify COD and TOC). In such case, advanced oxidation (ozone, ...) would be very inefficient and expensive in operating costs. Hence (advanced) biological treatment with biological nitrogen removal - upstream of UF - would be far more efficient and sustainable.

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