| Summary: | 碩士 === 逢甲大學 === 綠色能源科技碩士學位學程 === 104 === Kitchen waste (KW) is rich in carbohydrates which is a well carbon source for anaerobic hydrogen producer to produce hydrogen and methane. This experiment is divided into two parts: batch and continuous operation.
Batch is focuses on operation condition. (1) COD concentration (10-80 g/L), (2) temperature (35oC-55oC), (3) four kinds of seed sludge, (4) pH (5.5-7), (5) crushed KW was stored at room temperature (0-12 days). The results show that the best operation condition is COD concentration 40 g/L, 50oC, pH 6, store 3 days. There are hydrogen yield 24.7 mL/g COD, the theoretical maximum amount of hydrogen 60.9 mL, hydrogen production rate 1.7 mL/h.
Continuous operation is divided into two stages. The first stage is hydrogen production by anaerobic fermentation. Using a continuous stirred tank reactor (CSTR, 1 L) with hydraulic retention time 12 hours, and increase the organic load (40-90 g / L), The results show that the maximum HPR 6 L/L/d at 90 g/L.
The second stage is a series of continuous operation hydrogen tank (CSTR, 1L) and methane tank (CSTR, 2L). Hydrogen tank operate at 90 g/L, HRT 12 h, 50oC, pH 6. Methane tank operate at HRT 144 h, 50oC, pH 7.2. The feeding is effluent from hydrogen tank. After starting on the 9th day, methane concentration began to rise. At 33th day has MPR 58 mL/L/d.
The results of energy efficiency assessment show that energy consumption is far below than production on laboratory scale. Shall be operated in real size to achieve production of energy greater than energy consumption.
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