Process for Managing Photobioreactor Exhaust

Abstract

There is provided a process for growing a phototrophic biomass in a reaction zone, wherein the reaction zone includes a reaction mixture that is operative for effecting photosynthesis upon exposure to photosynthetically active light radiation, wherein the reaction mixture includes phototrophic biomass that is operative for growth within the reaction zone. The process includes supplying at least a fraction of gaseous exhaust material, being discharged from an industrial process, to the reaction zone, exposing the reaction mixture to photosynthetically active light radiation and effecting growth of the phototrophic biomass in the reaction zone, wherein the effected growth includes growth effected by photosynthesis, and modulating distribution of a molar rate of supply of carbon dioxide, being exhausted from the reaction zone, as between a smokestack and at least another point of discharge.

1 . A process for growing a phototrophic biomass in a reaction zone, wherein the reaction zone includes a reaction mixture that is operative for effecting photosynthesis upon exposure to photosynthetically active light radiation, wherein the reaction mixture includes phototrophic biomass that is operative for growth within the reaction zone, comprising:
 supplying at least a fraction of gaseous exhaust material, being discharged from an industrial process, to the reaction zone;   exposing the reaction mixture to photosynthetically active light radiation and effecting growth of the phototrophic biomass in the reaction zone, wherein the effected growth includes growth effected by photosynthesis; and   modulating distribution of a molar rate of supply of carbon dioxide, being exhausted from the reaction zone, as between a smokestack (or a cold stack) and at least another point of discharge.   
     
     
         2 . The process of  claim 1 , wherein the modulating is based on an indication of the molar rate at which carbon dioxide is being exhausted from the reaction zone. 
     
     
         3 . The process of  claim 1 , further comprising supplying another fraction of the gaseous exhaust material, being discharged by the industrial process, to the smokestack. 
     
     
         4 . A process for growing a phototrophic biomass in a reaction zone, wherein the reaction zone includes a reaction mixture that is operative for effecting photosynthesis upon exposure to photosynthetically active light radiation, wherein the reaction mixture includes phototrophic biomass that is operative for growth within the reaction zone, comprising:
 supplying at least a fraction of gaseous exhaust material, being discharged from an industrial process, to the reaction zone;   exposing the reaction mixture to photosynthetically active light radiation and effecting growth of the phototrophic biomass in the reaction zone, wherein the effected growth includes growth effected by photosynthesis;   discharging a gaseous exhaust from the reaction zone;   separating at least an oxygen-rich product from the gaseous exhaust that is discharged from the reaction zone; and   contacting the oxygen-rich product with a fuel to effect combustion.   
     
     
         5 . The process of  claim 4 , wherein the contacting of the oxygen-rich product with a fuel is effected within a combustor of the industrial process. 
     
     
         6 . The process of  claim 5 , further comprising, prior to the contacting, supplying the oxygen-rich product to the combustor. 
     
     
         7 . The process  claim 4 ,
 wherein the separating includes separating an oxygen-depleted product from the gaseous exhaust that is discharged from the reaction zone;   and further comprising supplying the oxygen-depleted product to the reaction zone.   
     
     
         8 . A process for growing a phototrophic biomass in a reaction zone, wherein the reaction zone includes a reaction mixture that is operative for effecting photosynthesis upon exposure to photosynthetically active light radiation, wherein the reaction mixture includes phototrophic biomass that is operative for growth within the reaction zone, comprising:
 supplying at least a fraction of gaseous exhaust material, being discharged from an industrial process, to the reaction zone;   exposing the reaction mixture to photosynthetically active light radiation and effecting growth of the phototrophic biomass in the reaction zone, wherein the effected growth includes growth effected by photosynthesis;   discharging gaseous exhaust from the reaction zone;   separating at least an oxygen-depleted product from the gaseous exhaust that is discharged from the reaction zone; and   supplying the oxygen-depleted product to the reaction zone.   
     
     
         9 . A process for growing a phototrophic biomass in a reaction zone, wherein the reaction zone includes a reaction mixture that is operative for effecting photosynthesis upon exposure to photosynthetically active light radiation, wherein the reaction mixture includes phototrophic biomass that is operative for growth within the reaction zone, comprising:
 supplying at least a fraction of gaseous exhaust material, being discharged from an industrial process, to the reaction zone;   exposing the reaction mixture to photosynthetically active light radiation and effecting growth of the phototrophic biomass in the reaction zone, wherein the effected growth includes growth effected by photosynthesis;   discharging a gaseous exhaust from the reaction zone; and   heating the discharging gaseous exhaust with at least a fraction of the gaseous exhaust material to generate a heated gaseous exhaust.   
     
     
         10 . The process of  claim 9 , wherein the heating is effected by disposing the discharging gaseous exhaust in heat transfer communication with the at least a fraction of the gaseous exhaust material. 
     
     
         11 . The process of  claim 10 , wherein the heat transfer communication is indirect. 
     
     
         12 . The process of  claim 8 , further comprising contacting at least a fraction of the heated gaseous exhaust with a fuel to effect combustion of the fuel. 
     
     
         13 . The process of  claim 8 , further comprising supplying at least a fraction of the heated gaseous exhaust to a combustor, and effecting contacting of the at least a fraction of the heated gaseous exhaust with a fuel to effect combustion of the fuel. 
     
     
         14 . The process of  claim 12 , wherein, prior to the contacting, the gaseous exhaust is treated to effect generation of an oxygen-enriched product, wherein the at least a fraction of the heated gaseous exhaust includes the oxygen-enriched product. 
     
     
         15 . A process for growing a phototrophic biomass in a reaction zone, wherein the reaction zone includes a reaction mixture that is operative for effecting photosynthesis upon exposure to photosynthetically active light radiation, wherein the reaction mixture includes phototrophic biomass that is operative for growth within the reaction zone, comprising:
 supplying at least a fraction of gaseous exhaust material, being discharged from an industrial process, to the reaction zone;   exposing the reaction mixture to photosynthetically active light radiation and effecting growth of the phototrophic biomass in the reaction zone, wherein the effected growth includes growth effected by photosynthesis;   discharging gaseous exhaust from the reaction zone; and   recycling at least a fraction of the discharging gaseous exhaust to the reaction zone.   
     
     
         16 . A process for growing a phototrophic biomass in a reaction zone, wherein the reaction zone includes a reaction mixture that is operative for effecting photosynthesis upon exposure to photosynthetically active light radiation, wherein the reaction mixture includes phototrophic biomass that is operative for growth within the reaction zone, comprising:
 supplying at least a fraction of gaseous exhaust material, being discharged from an industrial process, to the reaction zone;   exposing the reaction mixture to photosynthetically active light radiation and effecting growth of the phototrophic biomass in the reaction zone, wherein the effected growth includes growth effected by photosynthesis; and   modulating the molar rate of supply of carbon dioxide, being exhausted from the reaction zone, to a smokestack or a cold stack.