tailieunhanh - Ảnh hưởng của đường lên quá trình khử nitơ thông qua mô phỏng, thí nghiệm theo mẻ trong phòng thí nghiệm và vận hành nhà máy pilot

Mục đích của nghiên cứu này là đánh giá ảnh hưởng của đường như nguồn carbon bên ngoài lên quá trình khử nitơ. Tốc độ khử nitơ (SDNR) được xác định bằng các thí nghiệm theo mẻ cho thấy sự thích nghi với đường có thể làm tăng SDNR lên 47% và 116% tại vùng sau và trước khi khử nitơ thiếu khí tương ứng. Việc sử dụng đường trong vùng sau và trước khi khử nitơ thiếu khí, tương ứng. | SCIENCE TECHNOLOGY DEVELOPMENT Vll 17 Effect of sucrose on denitrification through simulation lab-scaled batch tests and pilot plants Anh Due Phung M. othman J. Yulian RMIT Melbourne VIC Australia Manuscript received on 23 September 2014 accepted on 22 December 2014 ABSTRACT The aim of this study was to assess the impact of sucrose as external carbon source on denitrification. The specific denitrification rate SDNR determined using batch tests showed that acclimation to sucrose can increase SDNR in post and pre-anoxic denitrification zones by 47 and 116 respectively. The use of sucrose in pre-anoxic zone led to an SDNR of mg NO3-N g MLVSS h. This is times higher than in the absence of external carbon and times higher than the SDNR when sucrose was added into post-anoxic zone. The experiment has also tested the effect of sucrose on a pre-anoxic denitrification system with low carbon-to-nitrogen ratio C N influent of by adding roughly l50mgCOD L of sucrose into the pre-anoxic zone. This was done through two simulation modellings before the results were verified with a pilot plant trial run. The two simulation models a basic conceptual model and Biowin showed a drop of effluent TN from 8 mg L to mg L and mg L respectively. While the pilot plant test showed a clear drop from mg L down to mg L after adding sucrose. The result showed that the conceptual model was providing a more accurate simulation run than the Biowin model in this case. Keywords Denitrification external carbon source Biowin simulation INTRODUCTION The availability of organic carbon is one of the key elements for complete denitrification as it is often the limiting substrate for this process 1 2 3 Although the Modified Ludzack-Ettinger MLE uses the influent as a carbon source pre-anoxic denitrification could still be limited due to the lack of readily biodegradable chemical oxygen rbCOD in the influent and the low specific .