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提油后藻渣的利用和处理对于微藻生物柴油产业的发展具有重要意义。采用批次实验研究了初始pH值(pH值范围为5~9)对提油后藻渣发酵产氢的影响。研究结果表明,提高初始pH值引起累积产氢量和氢气产量逐渐下降。初始pH值从5增加到6.5引起氢气产生速率逐渐增加,而初始pH值从6.5增加到9时,氢气产生速率则逐渐下降。在pH 5时虽然氢气产量最高,为50 mL/g-挥发性固体,但是产氢延迟时间则长达20 h。在pH 6.5时发酵产氢启动较快(1.7 h),并且氢气产生速率最大,为3.79 mL/h。因此,藻渣发酵产氢的最适初始pH值为6.5。
Algae residue after the use of oil extraction and processing for the development of microalgae biodiesel industry is of great significance. The effect of initial pH value (pH range 5 ~ 9) on hydrogen production by algae residue after oil extraction was studied by batch experiments. The results show that increasing the initial pH causes a gradual decrease in cumulative hydrogen production and hydrogen production. The initial pH increased from 5 to 6.5, which led to the gradual increase of hydrogen production rate. When the initial pH was increased from 6.5 to 9, the hydrogen production rate decreased gradually. Hydrogen production was 50 mL / g-volatile solids at pH 5, but the hydrogen production delay was as long as 20 h. Hydrogen production by fermentation started faster (1.7 h) at pH 6.5, and hydrogen production was maximal at 3.79 mL / h. Therefore, the optimum initial pH value for hydrogen production from algal residue fermentation is 6.5.