2.4 總產氣量與單位產氣量
厭氧消化前后TS的去除率及單位TS的產氣量
見表2。在總產氣量、TS去除率、單位TS產氣率和消化單位TS產氣量，油菜和油麥菜在60和80 g/L
的有機負荷率下都較對照有明顯的提高，其中以油菜產氣量的提高最為顯著，總產氣量都較對照提高
了9倍左右，TS減少量由9.4%提高到了57.8%和65.8%。油麥菜的產氣狀況不如油菜的好，可能與其成分有關，但是其單位TS產氣率仍然達到了104.7和138.9mL/g，遠遠優于對照實驗。
3 結論
（1）經過兩步批次處理，油菜和油麥菜的產氣性能與對照比較都得到極大提高，油菜在60和80 g/L的有機負荷率下日平均產氣量分別為360mL/d和352mL/d，即0.24L/ (d·L)和0.23 L/ (d·L)；油麥菜分別為314mL/d和417mL/d，即0.21 L/ (d·L) 和0.28 L/ (d·L)。
（2）油菜產氣量的提高最為顯著，消化時間由常規批式厭氧消化的10d左右延長到了58d，在60和80 g/L的有機負荷率下的總產氣量分別達到了20.86L和20.42L，約為對照的9倍；單位TS產氣量也由23.1 mL/g上升至231.7和226.8 mL/g；最高甲烷體積分數達70.7%和83.9%。
參考文獻
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Two-step batch anaerobic biogasification of vegetable wastes
ZHENG MingXia LI XiuJin* LI LaiQing LIU YanPing
( College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China)
Abstract：Two-step batch technology was used to anaerobically digest cole and lettuce wastes to produce biogas. Two loading rates of 60 and 80 g/L and mesophilic temperatures of 35℃ were used. The wastes were first acidified and the liquid then separated for biogasification. The results showed that average daily biogas yield of the cole and the lettuce wastes at loading rates of 60 and 80 g/L were 360mL/d, 352mL/d, 314mL/d, and 417mL/d, respectively. The cumulative biogas production of the cole wastes was higher than that of the lettuce wastes. As compared to the single-step processes (control), two-step batch anaerobic digestion processes lasted longer times and the cumulative biogas production of the cole wastes was 20.86L and 20.42L, 9 times higher than the control; biogas yield per gram total solid (TS) loaded also increased from23.1 mL/g to 231.7 and 226.8 mL/g; the highest methane content was increased to 70.68% and 83.91%.
Key Words:：Vegetable waste; two-step batch anaerobic digestion; biogas
