Process & contact
Byosis (Nijhuis Saur Industries)
Member of NNP
Liquid fraction of organic wastes, manure or digestate: sewage sludge, manure or other biowastes.
Design avoids clogging and input liquor can contain up to 15% dry matter and/or with particles up to 12 mm.
-Unseparated liquid streams can be processed, but preferential set-up is with prior removal of solids, e.g. by centrifuge, cloth filter, filter press.
Ammonium sulphate (ASL 40% solution) or ammonium nitrate (ANL 50%) or ammonium bicarbonate (0.5% solution) or ammonia water (20%)
The liquid is heated and ammonia is stripped (off-gassed) from the liquid by a proprietary chemical process, and recovered. Ammonia stripping reduces toxicity in digesters, so increasing biogas production or improving biological treatment operation, depending on site configuration.
A heat exchanger allows for energy recovery
70 – 85 % recovery of ammonia-N can offer optimum OPEX – CAPEX, but higher N recovery rates are possible.
Tully Centralised Anaerobic Digestion Plant, Northern Ireland: 40.000 t/y of poultry litter, production of ASL.
Bio Energy Coevorden Netherlands : digestion of 300.000 t/y of manure and waste streams, production of ASL.
ZWAR, Bergen auf Rügen, Germany – recovery of >80% of ammonium from works’ sludge digestate and from sludge dryer condensate.
Hardenberg, Netherlands – recovery of ammonia from waste streams as ammonium bicarbonate for further processing to fertilisers.