期刊
BIORESOURCE TECHNOLOGY
卷 337, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.125393
关键词
Food waste; Biogas slurry; Lactic acid fermentation
资金
- Shenzhen Science and Technology Innovation Committee [JCYJ20200109142831245, KCXFZ20200201100844824]
- National Key Research and Development Program of China [2018YFC1902900]
This study found that adding laboratorial biogas slurry or industrial biogas slurry can significantly promote the production of lactic acid from food waste fermentation, especially carbohydrates. Industrial biogas slurry performed better due to higher pH, more diverse microbial community, and more functional microorganisms. The optimal ratio of additive to feedstock is 0.2, achieving the highest lactic acid yield.
It is a promising method to recover lactic acid from food waste (FW) fermentation, but the bottleneck problem is the low yield when using mixed inoculation. In this study, laboratorial biogas slurry (LBS) and industrial biogas slurry (IBS) were used as the additive in semi-continuous FW fermentation, aiming to promote the production of lactic acid. According to the research results, the addition of LBS or IBS promoted the production of lactic acid significantly from FW, especially carbohydrate, because it increased the pH values, maintained low OPR levels, and increased microbial number and diversity in the fermentation systems. IBS performed better than LBS because of higher pH, more diverse microbial community and more functional microorganisms. The best ratio of IBS to feedstock was 0.2, and the lactic acid yield reached 0.42 g/gVSadded. An excessively high dose would alter the fermentation pathways, reduce the ratio of lactic acid.
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