is applicable for any fermentation system where a tail or off gas rich in co 2 is produced and the fermentation process utilizes a source of nitrogen fig3 incorporates the ammonia recovery arrangement depicted in fig1 into its overall embodiment in this case a combination of several streams that have high ammonium a syngas scrubber stream carried by a line 14 and a waste water stream 16 are sent to ammonia recovery in this arrangement a fermentation vessel 20 delivers excess biosolids 77 for digestion in digester 60 digester 60 may be an anaerobic digester or aerobic digester and may be equipped with a device 40 that manages excess biosolids 77 by grinding or other means that enhance degradation streams 99 and 99 u2032 transfer biosolids to and from device 40 note that although shown as an internal recycle in fig3 using device 40 as a pretreatment or post treatment device is also possible digester 60 discharges the bulk of the total suspended solids tss to a separation device 80 that produces a concentrated solids stream 44 and waste water stream 16 which is low in suspended solids and rich in nutrients including ammonia line 11 introduces raw syngas into a direct contact scrubber cooler 10 for condensing and cooling line 21 carries cleaned syngas to fermentation vessel 20 while a condensed scrubber water stream passes via line 19 to a stripper 88 in stripper 88 a stripping gas stream 33 removes dissolved hydrocarbons that exit as gas stream 29 gas stream 29 is managed to utilize the energy content of the stripped hydrocarbons in the gas the remainder of the scrubber water now high in ammonium leaves stripper 88 via line 14 a condensate stream 25 formed.