培養基低氮循環利用策略對微藻減碳及成本效益實廠驗證之研究

Feasibility of Application for Medium Recycling with Low Nitrogen Source on Microalgal Carbon Dioxide Elimination and Cost Down

陳曉薇(Hsiao-Wei Chen) ； 柯子星(Tzu-Hsing Ko) ； 陳廉潔(Lien-Chieh Chen) ； 薛欣達(Hsin-Ta Hsueh)

《燃燒季刊》 90期 (2015/08) Pp. 50-58

https://doi.org/10.30041/CQ.201508_(90).0005

摘要

以微藻進行來自於電廠排放之二氧化碳固定及生質能源產出，相較於一般陸生植物，有著高生長速率及組成多樣性的優勢，係現今有相當潛力之課題。然而，在營養鹽及水資源製造程序之高耗能，成為在實際應用上相當大的阻礙。因此，本研究以螺旋藻Arthrospira platensis（A. platensis）以二種初始氮源濃度搭配培養液循環再利用的操作策略來進行評估其效益。本研究以生命週期來評估營養鹽成份、溫室建構材料、能源使用等項目之排碳並評估培養基低碳循環操作策略之減碳效益。再者，各項目之成本搭配微藻產量來評估操作策略之經濟效益。結果顯示，在低氮源初濃度下搭配培養液之循環再利用，A. platensis可以較低的成本及能耗維持良好的生長狀況。最佳的操作策略下可分別得到25%及52%的減碳及成本效益。若搭配高單價藻藍素生長，有機會達實廠生產之效益。

關鍵字

生物固碳 ； 生命週期評估 ； 二氧化碳減量 ； 成本效益

並列摘要

Elimination of carbon dioxide from power plant, one of major sources of carbon dioxide emission, is an effective strategy for retardation of global warming. Comparing to higher plants, microalgae is taken as a valuable candidate for bio-fixation of carbon dioxide due to its higher growth rate and various added values. However, high cost and energy use on nutrient and water production is the major obstacles for this application in our previous study via a pilot plant (tons) system test. Therefore, the further test on difference between recycling and fresh medium cultivation of ＂Arthrospira platensis＂ (＂A. platensis＂) is carried out based on two different intial nitrate concentrations in this study. Life cycle analysis is performed for evaluation of carbon dioxide elimination on several medium compositions, housing materials, energy use, and so on. Furthermore, economic analysis is carried out while the biomass productivity is taken as the index. The results show the notable advancement on carbon dioxide elimination (25%) and cost down (53%) can be obtained since ＂A. platensis＂ can grow well by using recycling medium in fewer cost and energy use.

並列關鍵字

Carbon biofixation ； Life cycle analysis ； CO2 elimination ； Cost benefit