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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Intensive Nitrification Process Employing Immobilized Nitrifiers on Polyester Carriers in Closed-System Aquaria) ผู้เขียน: ดร.อรุณวรรณ หวังกอบเกียรติ, รองศาสตราจารย์ ,  ศิริวัฒน์ คูเจริญไพบูลย์, Kannika Sripunya, นายธีระ เล็กชลยุทธ, ผู้ช่วยศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractFreshwater autotrophic nitrifying bacteria cultivated and fixed on polyester tablets were used as concentrated nitrifiers for rapid start-up of ammonia and nitrite removal in closed-system aquaria. Study on the present process has led to the following conclusions. In wastewater with blank carriers, the carriers acted as supporting media for immobilizing the intrinsic nitrifiers which were able to accelerate moderately the natural nitrification. The natural nitrification, however, showed moderate ammonianitrite transformation, but non-significant nitrite-nitrate transformation. The present intensive artificial nitrification process could remove rapidly the ammonia and nitrite to nearly 100 per cent starting from the beginning and continued throughout 40 days experiment. It could rapidly accomplish the ammonianitrite- nitrate nitrifying process successfully. The inexpensive materials used and the simple method so developed has made this a cost effective nitrogenous toxic compounds removal process which is very important for wastewater treatment as well as in the aquaculture. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Enhancement of Growth and Lipid Accumulation by Chlorella sorokiniana 1019 under Mixotrophic Culture Conditions) ผู้เขียน:ศิริวัฒน์ คูเจริญไพบูลย์, ดร.สาวิตรี ลิ่มทอง, ศาสตราจารย์ , ดร.วิเชียร ยงมานิตชัย, อาจารย์ สื่อสิ่งพิมพ์:pdf AbstractThe enhancement of the growth and lipid accumulation by a microalga, Chlorella sorokiniana 1019, was investigated under mixotrophic conditions. The results showed that the growth and lipid production in this alga were notably increased under mixotrophic conditions using a limited-nitrogen medium compared to phototrophic and heterotrophic conditions. The biomass yield and lipid production were approximately 3.9 and 2.6 times more than under phototrophic growth. Among the three carbon sources of glucose, potassium acetate and glycerol, 1% glucose promoted the highest growth rate at 7.58 g of cell dry weight.L-1 after 7 d of cultivation, while 3% acetate yielded the highest cellular lipid reaching 56% of the dried biomass. The fatty acid composition of the alga was slightly changed from the predominant linoleic acid in the glucose medium to palmitic acid in the acetate medium. |
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