Preparing fermentation residue, useful in e.g. fish culture, comprises separating solid, post-fermenting, treating anaerobic discharge, separating biomass, post-purifying, adding mineral salt, concentrating and producing carbon dioxide

摘要

Preparing fermentation residue, as a complex system for e.g. energy, comprises separating solids from fermentation residue; post-fermenting the residue; treating the anaerobic filter discharge; degrading N-substrates; separating the biomass remainder and low-molecular components; post-purifying water, ion exchanger and/or zeolites; adding mineral salt solutions through a mineral mixture; disinfecting water; concentrating the algal culture and producing the carbon dioxide for algal culture from the flue-gas wash of the combined heat and power plant (CHP) and/or from biogas cleaning. Preparation of fermentation residue, as a complex system for energy, water and nutrients, comprises separating solids (raw fibers) from the fermentation residues by means of decanters, separators or other suitable filter mechanisms; post-fermenting the fermentation residue in anaerobic fixed bed reactors for further biogas production and for C-decomposition; subsequently treating the discharge of the anaerobic filters by means of aerobic trickling filter for further C-decomposition; subsequently degrading N-substrates over a combined anaerobic/aerobic-step; separating the biomass remainder over external or immersed ultra-filtration modules; separating the low-molecular components by single- or multi-stage reverse osmosis; post-purifying water by combined cascade for the retention of residual impurities like organic compounds, ammonium or sulfide by means of activated charcoal, ion exchanger and/or zeolites; adding suitable mineral salt solutions over or through a mineral mixture for mineralizing the water for rearing fish or cattle watering tanks; disinfecting water with UV, ozone or other disinfection systems such as tetrachlorodecaoxide additives; concentrating the algal culture to algal concentrates by ultrafiltration as base for fish fodder; and producing the necessary carbon dioxide for algal culture from the flue-gas wash of the combined heat and power plant (CHP) and/or from biogas cleaning, where the low-temperature waste heat from CHP is transformed to current; the waste heat of the membrane filtration procedures (ultra-filtration and reverse osmosis) is useful for aquaculture in the produced water; and reverse osmosis concentrate is useful for algal cultures as fodder base for aquaculture.