For this kind of raw water ...
Published by Gunther Johne, Consultant - Environment Engineering (Water Treatment / Water Management / Resource Recovery)
For this kind of raw water quality, you need a special pre-treatment. The best way for the reduction of ammonia is an oxidation step with a high volume on oxygen followed from a filtration step with quartz gravel or an poriferous material based on calcium. Sulphate you can reduce with nanofiltration or an anion exchanger.