Treatment and utilization of tapioca starch waste water by photosynthetic bacteria technology
1991
Tassanee Lowhnoo (Kasetsart Univ., Bangkok (Thailand). Faculty of Science. Dept. of Microbiology) | Sumej Chavadej | Napawarn Noparatnaraporn
Studies on factors optimal to growth of the photosynthetic bacteria strain P IV were carried out in the 1.5 1-Rhoux bottle under microaerobic-light and non sterile condition. the result revealed that the optimal condition for growth are temperature at 35 deg. celsius and pH range of 6.0-8.5. Supplementation of nitrogen, phosphorus and three vitamin (nicotinic acid, biotin and thiamine) showed no effect on growth. The cultivation of strain P IV under the optimal condition yield a maximum dry cell mass of 4.35 g/l after 11 days, all productivity of 0.92 g dry cell/g volatile fatty acids with 96.40 % of volatile fatty acids utilization and 91.50 % of COD reduction efficiency. The outdoor-open-culture, showed the possibility of culture system, yielded 2.56 g dry cell/l after 24 days with 52.12 % of volatile fatty acids utilization and 32.75 % of COD reduction efficiency. The semicontinuous cultivation resulted in the increase of dry cell mass at 1 l/day dilution rate yielded a maximum dry cell mass of 5.31 g/l, the productivity of mixed liquor suspended solids to 381.74 mg/l/day. The cell mass harvested from the outdoor-open-culture showed the crude protein content of 51.79 % and various vitamins.
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