以三段式反應槽提升稻殼產氫與產甲烷之可行性研究

Hydrogen Production and Methanogenesis of Rice Husk Conducted in Three-Stage Reactors

林明瑞(Min-Ray Lin)；林一傑(Yu-Chieh Lin)；謝孟宏(Meng-Hung Hsieh)

水解 ； 厭氧醱酵產氫 ； 稻殼 ； 三段反應槽 ； 甲烷化反應 ； hydrolysis ； anaerobic fermentative hydrogen production ； rice husks ； three-stage reactors ； methane production

科學與工程技術期刊

9卷1期（2013 / 03 / 01）

29 - 42

繁體中文

台灣每年產生大量的稻殼廢棄物，本研究將利用稻殼作為基質，進行一連串的水解、醱酵產氫及甲烷反應等三段連續流反應槽試驗，以評估稻殼之厭氧產氫、產甲烷的可行性。研究結果顯示：在連續流試驗中，水解（sequencing batch reactor, SBR）串聯醱酵產氫（continuously stirred tank reactor, CSTR）之二段式反應槽之產氫率為3.31 mmole H2/g-CODin遠高於ASBR 共培養反應槽之產氫率，為1.81 mmole H2/g-CODin。在二段式分離培養反應槽中，前段SBR水解操控於pH 7.0左右，總循序時間為6 hr；後段醱酵產氫CSTR反應槽，操控於pH 5.0-5.5，HRT為18 hr，有最佳的產氫效率，達19.8 mmole- H2 /L．day，每克CODin的氫氣產量達1.47 mmole H2/g-CODin。以第二段醱酵產氫反應槽之後的出流水作為甲烷化流體化床反應槽的基質，進行烷化反應，則單位體積反應槽每天產量可達4620 cal / L．day 及535 cal / g-CODin 以上，比光合產氫柱塞流式反應槽（861 cal / L．day 及131cal / g-CODin）與光合產氫完全混合式反應槽（253 cal / L．day 及51.8 cal / g-CODin）為佳。以甲烷化流體化床反應槽為第三段反應槽，整體而言，甲烷化反應槽以pH 控制在7.0，溫度在35°C，迴流流量為1,000 ml/min 有最佳甲烷產率，就每克進流COD甲烷產率而言，以HRT為24 hr、進流COD濃度為10,000 mg/L時，為最佳之每克進流COD甲烷產率，為0.911 mmole-CH4 / g-CODin；就單位體積甲烷產率而言，以HRT為6 hr、進流COD濃度為30,000 mg/L時，為最佳之單位體積甲烷產率，為65.3 mmole- CH4 / L．day。

A huge rice husk waste is produced in Taiwan every year. This study used rice husk as substrate to explore the feasibility of three-stage continuous input reactors for fermentative hydrogenesis and methanogenesis. The results show as follows: In continuous input tests, the separated two-stage reactors, a hydrolytic SBR connected by a hydrogenic CSTR produced, 3.31 mmole H2/g-CODin and were higher than co-cultivated ASBR (1.81 mmole H2/g-CODin). The separated two-stage reactors, the first reactor, hydrolytic SBR was set at pH 7.0, with total progressive time of 6 hrs, and the second reactor, fermentative hydrolytic CSTR was set at pH 5.0-5.5, with HRT of 18 hrs, got the best hydrogen productivity, up to 19.8 mmole-H2/L. day and 1.47 mmole H2/g-CODin.While the effluent of second stage reactor for fermentation hydrogen production was used as the substrate for methane production by fluidized bed reactor, the daily energy produced of per unit volume of the reactor and the per gram of influent COD by methanogenic fluidized bed reactor (4620 cal / L. day and 535 cal / g-CODin) were higher than those of the plug-flow (861 cal / L . day and 131 cal / g-CODin), and the completely mixing (253 cal / L. day and 51.8 cal / g-CODin) photosynthetic hydrogen producing reactors.The third stage, the methanogenic fluidized bed reactor was set at pH7.0, with temperature of 35 C and recycling flow rate of 1,000 ml / min. While the HRT was 24 hours and influent COD concentration was 10,000 mg / L, the best methane production of per gram of influent COD was 0.911 mmole-CH4 / g-CODin. While the HRT was 6 hrs and influent COD concentration was 30,000 mg / L, the best methane production of per unit volume reactor was 65.3 mmole-CH4 / L. day.