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A photobioreactor is disclosed for cultivating a photosynthetic organism. This photobioreactor provides innovative features that allow an easy cleaning of the light source. The photobioreactor has a container for containing a liquid culture medium for cultivating photosynthetic organisms, light-emit

A photobioreactor is disclosed for cultivating a photosynthetic organism. This photobioreactor provides innovative features that allow an easy cleaning of the light source. The photobioreactor has a container for containing a liquid culture medium for cultivating photosynthetic organisms, light-emitting tubes mounted within the container. The photobioreactor also has cleaning devices mounted within the container for cleaning the outer surface of the light-emitting tubes and actuators for actuating the cleaning devices.

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A photobioreactor is disclosed for cultivating a photosynthetic organism. This photobioreactor provides innovative features that allow an easy cleaning of the light source. The photobioreactor has a container for containing a liquid culture medium for cultivating photosynthetic organisms, light-emit

A photobioreactor is disclosed for cultivating a photosynthetic organism. This photobioreactor provides innovative features that allow an easy cleaning of the light source. The photobioreactor has a container for containing a liquid culture medium for cultivating photosynthetic organisms, light-emitting tubes mounted within the container. The photobioreactor also has cleaning devices mounted within the container for cleaning the outer surface of the light-emitting tubes and actuators for actuating the cleaning devices. sion process performed successively in one or more columns packed with said carrier. 6. The process according to claim 4 or 5, wherein said solution is recirculated through one or more of said columns. 7. The process according to claim 4 or 5, wherein said solution is fed successively through a series of said columns. 8. The process according to claim 4, wherein said carrier comprises an inert material selected from the group consisting of porous glass beads, porous silicate beads and active charcoal. 9. The process according to claim 4, wherein said carrier comprises a weakly basic anion exchange substance in the form of a substantially non-compressible porous particulate solid material. 10. The process according to claim 1, wherein said micro-organisms are selected from the group consisting of Leuconostoc pseudomesenteroides, Aspergillus candidus, Zygosaccharomyces rouxii, Candida versatilis, Lactobacillus fermentum, Lactobacillus cellobiosus, Lactobacillus brevis, Lactobacillus buchneri, Leuconostoc mesenteroides and Leuconostoc oenos. 11. The process according to claim 9, wherein said micro-organism is Leuconostoc pseudomesenteroides (ATCC 12291). 12. The process according to claim 1, wherein said reconditioning step comprises adjusting the pH of said solution to a value above about 4. 13. The process according to claim 1, wherein said reconditioning step comprises adjusting the pH of said solution to a value between about pH 4.5 and 6.5. 14. The process according to claim 1, wherein said reconditioning step comprises adjusting the pH to a value of about pH 5. 15. The process according to any one of claims 12, 13 and 14, wherein the pH of said solution is adjusted by adding a base selected from the group consisting of an alkali hydroxide and ammonium hydroxide or by adding a buffering substance. 16. The process according to any one of claims 12, 13 and 14, wherein the pH of said solution is adjusted by removing acid formed during the conversion. 17. The process according to claim 16, wherein carbonic acid formed by dissolution of carbon dioxide produced during the conversion is removed by reducing the pressure of said solution. 18. The process according to claim 1, wherein said reconditioning step comprises adjusting the temperature of said solution to about 20 to 35° C. 19. The process according to claim 1, wherein said reconditioning step comprises adjusting the volumetric flow rate of said solution to a value of about 2 to 20 bed volumes per hour. 20. The process according to claim 1, wherein said reconditioning step comprises adjusting the substrate fructose content of said solution to about 7 to 200 g/l. 21. The process according to claim 1, wherein said reconditioning step comprises adding a co-substrate to said solution to about 4 to 100 g/l. 22. The process according to claim 1, wherein said reconditioning step comprises adding nutrients to said solution. 23. The process according to claim 22, wherein said nutrients are selected from the group consisting of yeast extract, tryptone, Na2HPO4,magnesium sulphate, manganese sulphate and mixtures thereof. 24. The process according to claim 1, wherein said reconditioning step comprises recovering mannitol between successive conversion steps. 25. The process according to claim 24, wherein said reconditioning step comprises returning any substrate remaining in the mother liquor after final mannitol recovery to said solution. 26. The process according to claim 24, wherein said reconditioning step comprises recovery of acids from said solution by chromatography or ion exchange. 27. The process according to claim 25, wherein said reconditioning step comprises returning at least a part of said mother liquor to said solution. 28. The process according to claim 1, wherein said reconditioning step comprises removing solid or liquid components contained in said solution by one or more processes selected from the group consisting of filtration, precipitation,