Method for producing gaseous dihydrogen and ammonium sulfate from an aqueous liquid effluent, such as the liquid fraction of a pig manure or human urine

A process for the production of gaseous dihydrogen and ammonium sulphate from an aqueous liquid effluent containing organic and inorganic materials or from a mixture of aqueous liquid effluents containing organic and inorganic materials, said aqueous liquid effluent or effluents being selected from the following effluents:

• liquid fraction of a liquid slurry, such as pig slurry;
• liquid fraction of an anaerobic digestate;
• liquid fraction of sewage plant sludge digestate;
• wastewater;
• animal or human urine,
• said process comprising the following steps:
• nanofiltration of said aqueous liquid effluent or said mixture of aqueous liquid effluents so as to obtain a permeate;
• ammonia stripping of the permeate from said nanofiltration step in an ammonia stripping unit, so as to obtain ammonium sulphate;
• treatment by reverse osmosis of at least part of the permeate extracted from the ammonia stripping unit after said ammonia stripping step, so as to obtain an osmosed aqueous solution;
• electrolysis of at least part of said osmosis aqueous solution so as to decompose said part of said osmosis aqueous solution into at least gaseous dihydrogen.