摘要
通过添加草本植物(牛尾巴草)强化剩余污泥碱性厌氧发酵生产短链挥发性脂肪酸(SCFA),可克服污泥碳氮比过低而影响蛋白质利用的问题。试验结果表明,当污泥和草本植物总固体(TSS)的质量比为1∶2时产酸效果最佳,此时混合系统中挥发性有机物(VSS)最大产酸量为425.6 mg COD/g,是污泥单独碱性发酵组的1.7倍,是草本植物单独发酵组的2.7倍。草本植物的投加能够强化污泥厌氧反应体系水解,在最佳混合比下,水解速率为污泥单独碱性发酵组的1.93倍。草本植物的投加对甲烷积累影响不大,产酸效果最佳混合组的甲烷累积量仅为污泥单独发酵组的103%。此外,溶解性蛋白质、多糖及酶活性检测结果也验证了添加草本植物的强化产酸作用。
The experiment extended the study of short-chain fatty acid （SCFA） production in anaerobic fermentation of excess sludge under alkaline condition by adding herbaceous plant--meadow fescue to the fermentation system to substantially promote SCFA production, to solve the problem that the low carbon to nitrogen mass ratio （C/N） in sludge was restricting the utilization of protein. Experimental results showed that the optimal mass ratio of sludge to the total suspended solids （TSS） of herbaceous plant was 1 ： 2. The yield of SCFA from per gram of volatile suspended solids （VSS） in the hybrid sys- tem was 425.6 mgCOD （ chemical oxygen demand）, which was 1.7 times higher than that in the sole sludge alkaline fermentation system, and 2.7 times higher than that in the meadow fescue fermentation. Further study indicated that the addition of herbaceous plant could enhance the hydrolysis process, and the hydrolysis rate at the optimal condition was 1.93 times higher than that in the sole sludge alkaline fermentation system. Moreover, the addition of meadow rescue posed minimal effect on the methane accumulation, which was 103% of that in the sole sludge alkaline fermentation system. In addition, the test results on soluble protein, polysaccharide, and enzyme activity also supported the enhancement of SCFA yield by adding herbaceous plant-meadow fescue.
出处
《中国给水排水》
CAS
CSCD
北大核心
2018年第1期89-93,共5页
China Water & Wastewater
基金
国家自然科学基金资助项目(51478283)
苏州市科技计划项目(SS201522)
关键词
剩余污泥
厌氧发酵
草本植物
短链挥发性脂肪酸
甲烷
excess sludge
anaerobic fermentation
herbaceous plant
short-chain fatty acid
methane
