Ammonia 2 Chlorine compounds 2 Total ammonia nitrogens Ammonia-nitrogen removals 1 Ammonium chloride 1 Anaerobic digestion 1 Article 1 Bio-media 1 Biofilters 1 Biofiltration 1 Biofiltrations 1 Biogas 1 Biogas purifications 1 Biomedia 1 Carbon dioxide 1 Charcoal 1 Chemical industry 1 Coconut shells 1 Conversion rates 1 Desulfurization 1 Effluents 1 Hydrogen sulfide 1 Nitrogen 1 Nitrogen oxides 1 Novel design 1 Nutrients 1 Organic nitrogen 1 Oxygen 1 Poultry litter 1 Quality control 1