Please use this identifier to cite or link to this item:
Ammonia removal by phototrophic bioelectrochemical systems
|Authors: ||Yang, Linsy|
|Contributors: ||NTOU:Department of Harbor and River Engineering|
|Issue Date: ||2017-05-24T08:40:40Z
|Abstract: ||水環境中主要污染物為氨氮，應仔細控制以避免造成富營養化，這些污染物被排放到水域前需要妥善的處理。在本研究中，以兩個新型光合生物電化學（PBEC）系統（R1和R2），將合成廢水和之添加氨氮之湖庫水作為進流，檢測其去除氨氮和產電之性能。兩個PBEC系統皆相同，不使用質子交換膜，具有之尺寸為430 mL的陽極槽和陰極槽6700 mL，進流量為1.5 L/d。R1進水氨氮濃度為1.5 mg/L（相當於負荷率5.3 g/m3.d）和R2為15 mg/L（負荷率50.3 g/m3.d）。連續操作130天後，此PBECs顯示具有良好的氨氮去除率，但產電不佳。具體而言，R1能去除100%氨氮而R2去除69%氨氮。庫侖效率R1為0.02%和R2 0.003%。質量平衡計算顯示，氨氮的去除主要是由硝化作用完成，佔69%，產電僅佔0.02%的氨氮去除率，而硝化細菌吸收4%氨，以及微藻吸收18%氨。在陰極槽生長的微藻能提供足夠的氧氣進行硝化作用，如在R2中藻類供氧量為5.3g/m3-d，可取代傳統使用的機械曝氣。此外，懸浮生長微生物去除33%之氨氮，而附著生長去除67%。本研究指出PBEC系統可用於處理含氨氮之廢水，但是未來研究應提高負荷率，以增加其應用潛力。 關鍵字：光合生物電化學系統、氨氮、硝化作用、藻類|
Ammonia nitrogen being a major pollutant in water environment should be carefully controlled to avoid causing eutrophication, which requires proper treatment before the pollutant is disposed to water body. In this study, two novel phototrophic bioelectrochemical, (PBEC) systems (R1 and R2) were examined for their performance in removing ammonia nitrogen and electricity generation while synthetic wastewater and lake water amended with ammonia were used as influent. The two identical PBEC systems were constructed without using proton exchange membrane, having dimensions of anode chamber 430 mL and cathode chamber 6700 mL, and were discharged with influent flow rate of 1.5 L/day. The ammonia nitrogen concentration in influent to R1 was 1.5 mg/L (equivalent to loading rate 5.3 g/m3.d) and to R2 was 15 mg/L (loading rate 50.3 g/m3.d). After continuous operation for over 130 days, these PBECs show good efficiency in ammonia removal but poor electricity generation. Specifically, the R1 removed 100% of ammonia nitrogen whereas R2 removed 69% of nitrogen. The Columbic efficiency for R1 was 0.02% and for R2 0.003%. Mass balance calculation indicated that ammonia nitrogen removal was accomplished mostly by nitrification, accounting for 69%. The electricity generation only accounted for 0.003 % of ammonia nitrogen removal, whereas the nitrifiers uptake 4% ammonia, and the microalgaes uptake 18% of ammonia. The microalgae grown in cathode chamber supplied sufficient oxygen for nitrification, e.g., 5.3 g/m3-d in R2, which can substitute for the mechanical aeration that conventionally employed. Furthermore, the suspended growth contributes 33% in removing ammonia and attached contributes 67%. This study suggests that PBEC is feasible to be used in treating wastewater containing ammonia nitrogen, but future research should be conducted to explore potential by increasing the loading rate. Keyword：phototrophic bioelectrochemical、ammonia、nitrification、algae
|Appears in Collections:||[河海工程學系] 博碩士論文|
Files in This Item:
There are no files associated with this item.
All items in NTOUR are protected by copyright, with all rights reserved.