Self-reuse of distillation residue as a nitrogen source for simultaneous saccharification and fermentation in a bioethanol production process from rice straw
2015
Vu, K.L.V. (Ho Chi Minh City University of Technology, Ho Chi Minh City (Vietnam)) | Tran, U.P.N. | Nguyen, Q.D. | Le, P.T.K. | Phan, T.D. | Mochidzuki, K. | Kobayashi, S. | Seo, D.J. | Sakoda, A.
In this study, the reusability of some portions in distillation residues obtained in a bioethanol production process was investigated as a supplemental nitrogen source for next single batch, focusing on simultaneous saccharification and fermentation (SSF) of rice straw. Distillation residues which obtained in our pilot plant were firstly divided into two parts: liquid and sludge (DR-L and DR-S) and DR-S was further dried and grinded to be powder (DR-P). For the comparison of nutritional effect on SSF between corn steep liquor (CSL) as a control and the distillation residues, compositional analyses (fiber, nitrogen content and amino acids) were performed. Although the total nitrogen content of the distillation residues was less than a half of CSL, amino acids in DR-P (2.24 %), which can be directly used for the yeast growth, was slightly lower than that in CSL (3.64 %). The performance of SSFs with the distillation residues was monitored. Final ethanol concentration of SSF with DR-L and DR-S (as water and nutrient loading) was 3.52 % (w/w) comparable to that with CSL (3.28 %). The use of distillation residues was concluded to be promising in the bioethanol production, reducing the conventional costly nutrient. In addition, it was suggested that the utilization of the liquid distillation residue would contribute to water recycling.
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