微藻減碳及成本改善策略及效益分析

Strategies for CO_2 elimination and profit by using Spirulina sp. in power plant cultivation system and verified by life cycle assessment

薛欣達(Hsin-Ta Hsueh) ； 蔡勝斌(Sheng-Bin Tsai) ； 陳廉潔(Lien-Chieh Chen) ； 陳曉薇(Hsiao-Wei Chen) ； 吳俊賢(Chun-Shian Wu) ； 傅弼豊(Bi-Li Fu) ； 王雪安(Hsueh-Ann Ong) ； 吳佳穎(Jia-Ying Goh) ； 胡育連(Yu-Lien Hu)

《燃燒季刊》 98期 (2017/08) Pp. 54-65

https://doi.org/10.30041/CQ.201708_(98).0006

摘要

微藻相較於一般陸生植展現較高的固碳能力，因此，穩定有效地增加各項培養所產出的能資源效益，成為創造固碳價值鏈能否成功的關鍵。本研究以螺旋藻Arthrospira platensis (A. platensis)之實廠培養，分析不同操作改善策略，最終以五種不同的應用情境來進行價值鏈分析並評估其效益。在實驗培養方面，風扇自動排熱設備控溫下之溫室培養，在夏季生長優於春季時之培養。顯示排熱設備之效能及對較低溫氣候下溫室效能的不足。而收成時採用中空纖維管，由於本身體積限制及時效性會造成藻體自體分解，目前仍以不銹鋼篩網之操作較具可行性。在排碳方面之操作改善策略以氣舉用氣之降低最為有效，其次為培養基之再利用。而就培養成本之降低，則是以培養基之再利用最具改善效益。當然，廢水對培養基取代性之研究，係後續重點工作之一。最後，在應用情境效益分析方面，以藻藍素C-phycocyanin(CPC)之應用最具效益，因此，在健康效益方面所衍生之減碳成效，將是減碳效益研究重要的一環。

關鍵字

生物固碳 ； 改善策略 ； 二氧化碳減量 ； 生命週期評估 ； 應用效益

並列摘要

Microalgae cultivation system is a well-known tool for carbon dioxide elimination and its high performance is much better than general terrestrial plants. Therefore, the key for the success of the carbon sequestration cycle is keep going to enhance the profit while using more and more limited energy and material resources in the whole process of microalgal cultivation. In this study, Arthrospira platensis (A. platensis) was used as a candidate to obtain the lower CO_2 emission and process cost under various operation strategies. In addition, the valued chain analysis was also carried out on five various application scenarios and their profits were compared. In the field cultivation, the growth at summer season was better than spring even in the the greenhouse cultivation field. It revealed the automatic heat vent system was controlled very well in summer but not useful as the temperature was low. With regard to microalgal harvest, the use of hollow fiber tubes was not practical due to its concentration and time limitation, thus the stainless steel screen is much useful in this field. The improvement strategy on carbon sequestration is effective, the most one is to reduce the use of gas-lift, followed by the reuse of the culture medium. The most effective strategy for cost-down of cultivation is the reuse of the culture medium. Therefore, the study on the cultivaton by using the wastewater will be important. According to profit analysis under various application scenarios, the most one is the scenario involved C-phycocyanin (CPC) applicaton. However, the estimation on carbon reduction in terms of its health benefits should be one of the dominant topics in this kind of research scope.

並列關鍵字

Microalgae bio-fixation ； Improvement strategy ； CO_2 elimination ； Life cycle assessment ； Application profit