摘要
脂肽可以强化污泥厌氧发酵生产短链挥发性脂肪酸(SCFA),但污泥本身固有C/N过低限制了SCFA的产生量。向污泥厌氧发酵体系中添加草本植物以提高发酵基质的C/N,结果表明草本植物的添加有助于强化污泥厌氧发酵的水解和酸化过程,发酵基质最佳C/N为20∶1(质量比),此时厌氧发酵体系溶解性化学需氧量(SCOD)最大值为6 564 mg/L,SCFA的最大积累量为423mg/g(以单位干质量挥发性悬浮颗粒物中的COD质量计,下同),显著高于污泥单独厌氧发酵体系(SCOD最大值为1 352 mg/L,SCFA的最大积累量为248 mg/g)。机制分析表明,适宜的C/N可以为厌氧微生物提供良好的生长环境进而促进蛋白质和多糖的溶出,强化酸化过程中关键酶的活性,但对甲烷累积产量却没有明显影响,因此有助于SCFA的积累。
Lipopeptide can enhance the production of short chain volatile fatty acids( SCFA) from anaerobic fermentation of sludge,but the inherent C/N ratio of sludge limits the amount of produced SCFA. Herbal plant was added into sludge fermentation system to improve the C/N ratio of fermentation substrate. The results showed the addition of herbal plant could help to enhance the hydrolysis and acidification processes of sludge anaerobic fermentation,and the optimum C/N ratio of fermentation substrate was 20 ∶ 1( mass ratio). At this time,the maximum soluble chemical oxygen demand( SCOD) of the anaerobic fermentation system was 6 564 mg/L,and the maximum accumulation of SCFA was 423 mg/g( COD in mass per unit dry mass volatile suspended solids),which were significantly higher than those( SCOD maximum of 1 352 mg/L,SCFA maximum accumulation of 248 mg/g) from sludge anaerobic fermentation system alone. The mechanism analysis showed that the suitable C/N ratio could provide a good growth environment for anaerobic microorganisms and promote the dissolution of proteins and polysaccharides,strengthen the activity of key enzymes in the acidification process,but had no significant impact on the cumulative yield of methane,thus contributing to the accumulation of SCFA.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2017年第9期1021-1025,共5页
Environmental Pollution & Control
基金
全国农业职业教育"十三五"科研课题(No.2016-135-Y-181)
关键词
厌氧
微生物
草本植物
短链挥发性脂肪酸
anaerobic
microorganism
herbal plants
short chain volatile fatty acid
