摘要
为探究表面活性剂在自热高温微氧(ATMAD)发酵体系中对有机碳源的释放会产生何种影响,选取鼠李糖脂(RL)这一无毒无害且易于获取的典型生物表面活性剂,依托ATMAD发酵体系,展开实验探究.结果表明,投加0.02~0.07g/gTSS鼠李糖脂对反应体系中污泥的溶解,可溶性有机物的释放及挥发性脂肪酸的积累有较为明显的促进作用,相关指标均有明显提高,产酸相关功能菌的丰度也有所增加,当投加量为0.07g/gTSS时,VFA累积浓度最高,为空白组的1.63倍,判断此时为最佳投放浓度;当投加浓度高于0.10g/gTSS时,会对有机碳源的释放产生抑制.在ATMAD体系中添加适量鼠李糖脂对于开发优质外加碳源这一工作具有较高的可行性.
The VFA(Volatile Fatty Acid)produced during the digestion of surplus sludge can be used as an additional carbon source for nitrogen and phosphorus removal in waste water treatment process.In order to evaluate effects of surfactants on the effective carbon source in the Autothermal Thermophilic Micro-Aerobic Digestion system(ATMAD)and promote the development of internal carbon sources by using RL(Rhamnolipid)as a typical biosurfactant.The results show that the amount of VFA significantly increased with an appropriate amount of RL,and the main indexes such as SCOD,VFA,protein and polysaccharide in the supernatant were highly improved.The sludge dissolution effect significantly increased with an addition of RL by 0.02~0.07g/gTSS.The release of soluble organic matter and accumulation of VFA in the reaction system increased and be up to the highest and fastest when the RL dosage was 0.07g/g TSS.In addition,increasing the concentration of bacteria related to acid production fermentation(such as Bacteroides and Clostridium)could effectively promote the accumulation of volatile fatty acids.Evidently,an appropriate dosage of rhamnolipid can lead to a high feasibility and practicability for developing high-quality external carbon sources ATMAD system.
作者
邢一言
高春娣
刘奕伟
毕豪华
欧家丽
彭永臻
XING Yi-yan;GAO Chun-di;LIU Yi-wei;BI Hao-hua;OU Jia-li;PENG Yong-zhen(National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology,Faculty of Environment and Life,Beijing University of Technology,Beijing 100124,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2024年第1期93-102,共10页
China Environmental Science
基金
国家自然科学基金项目(52270017)。
关键词
自热高温微氧
鼠李糖脂
污泥消化
有机碳源
挥发性脂肪酸
autothermal thermophilic micro-aerobic
rhamnolipid
sludge digestion
organic carbon source
volatile fatty acid
