Shi Suan, Li Jing, Guan Wenjian, Blersch David
Department of Biosystems Engineering, Auburn University AL 36849 USA
The Alabama Center for Paper and Bioresource Engineering, Auburn University AL 36849 USA.
RSC Adv. 2018 Sep 5;8(55):31267-31274. doi: 10.1039/c8ra06142d.
The aim of this work was to study the feasibility of using fish manure waste as a nutrient source for lactic acid fermentation. Fish waste contains nitrogen and minerals that could support the growth of lactic acid bacteria (LAB), making it a good candidate as the nutrient source for lactic acid fermentation. Two different fish manure wastes, from Nile tilapia and channel catfish aquaculture, were investigated for their performance on different sugar substrates. Both fish waste types showed low efficiency in the direct fermentation of glucose, but satisfactory efficiencies in simultaneous saccharification and fermentation (SSF) of cellulosic materials, such as pure cellulose and paper sludge. The highest lactic acid yield obtained was 87% and 91%, with a corresponding volumetric productivity of 1.006 and 0.580 g L h, and corresponding lactic acid concentration of 96 and 56 g L for cellulose and paper sludge, respectively. Fish waste concentrations did not show much impact on lactic acid production for the SSF process, where increasing fish waste from 10 to 30 g L resulted in less than a 10% yield increase. In the present study, fish manure waste was shown to be an effective and economic nutrient source for lactic acid production by SSF.
这项工作的目的是研究将鱼粪废弃物用作乳酸发酵营养源的可行性。鱼废料含有可支持乳酸菌（LAB）生长的氮和矿物质，使其成为乳酸发酵营养源的理想候选物。研究了来自尼罗罗非鱼和沟鲶养殖的两种不同鱼粪废弃物在不同糖底物上的性能。两种鱼废料在葡萄糖直接发酵中效率较低，但在纤维素材料（如纯纤维素和纸污泥）的同步糖化发酵（SSF）中效率令人满意。获得的最高乳酸产量分别为87%和91%，相应的体积产率分别为1.006和0.580 g L h，纤维素和纸污泥的相应乳酸浓度分别为96和56 g L。鱼废料浓度对SSF过程中的乳酸生产没有太大影响，将鱼废料从10 g L增加到30 g L导致产量增加不到10%。在本研究中，鱼粪废弃物被证明是通过SSF生产乳酸的有效且经济的营养源。
