Bioconversion of swine manure into high-value products of medium chain fatty acids.
Bioconversion of swine manure into high-value products of medium chain fatty acids.
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DOI：
10.1016/j.wasman.2020.06.021
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发表时间：
2020-06
期刊：
影响因子：
8.1
通讯作者：
Wanqin Zhang;Fubin Yin;Hongmin Dong;Qitao Cao;S. Wang;Jiajie Xu;Zhiping Zhu
中科院分区：
文献类型：
--
作者：
Wanqin Zhang;Fubin Yin;Hongmin Dong;Qitao Cao;S. Wang;Jiajie Xu;Zhiping Zhu
这项研究首次提出并证明了利用猪粪作为复合原料生产高价值中链脂肪酸（MCFA）。采用两段厌氧消化（AD）羧酸盐平台，将猪粪转化为短链脂肪酸（SCFAs），然后在添加乙醇的情况下将SCFAs转化为MCFA（正己酸、正庚酸和正辛酸）。确定了适宜的初始pH值为10.0，碳转化率为71.2%，乙酸、丙酸是主要产物，占初级阶段SCFAs总量的72.9%左右（I）。通过添加乙醇，61.3%的转化碳在复合SCFAs溶液中转化为MCFA（C6-C8）在链伸长阶段（II），而只有6.7%归因于甲烷的形成。正己酸、正庚酸和正辛酸的浓度分别达到8.6 g COD/L（3.9 g/L）、6.4 g COD/L（2.7 g/L）和2.6 g COD/L（1.07 g/L）。本研究实现了相对较高浓度的正庚酸与过去的研究相比，MCFA从其他原料。这些研究结果表明，一种新的资源回收途径和生产MCFA从猪粪的操作参数。
This research proposes and demonstrates, for the first time, the utilization of swine manure as a complex feedstock to produce high-value medium chain fatty acids (MCFA). The two-stage anaerobic digestion (AD) carboxylates platform was adopted for the conversion of swine manure to short chain fatty acids (SCFAs) and then SCFAs to MCFA (n-caproate,n-heptanoate, andn-caprylate) with ethanol supplementation. We defined the appropriate initial pH of 10.0 for SCFAs production with a carbon conversion rate of 71.2%, and acetate, propionate were the main products, which accounted for around 72.9% of the total SCFAs in the primary stage (I). Through the addition of ethanol, 61.3% of the converted carbon in the complex SCFAs solution was converted into MCFA (C6-C8) in the chain elongation stage (II), while only 6.7% was attributed to methane formation. The concentrations ofn-caproate,n-heptanoate, andn-caprylate reached 8.6 g COD/L (3.9 g/L), 6.4 g COD/L (2.7 g/L), and 2.6 g COD/L (1.07 g/L), respectively. This study achieved a relatively higher concentration ofn-heptanoate compared with past studies of MCFA from other feedstock. These findings demonstrated a new route for resource recovery and the operating parameters for producing MCFA from swine manure.