热碱预处理和pH协同控制厌氧酸化产物及控制机理分析
Thermokalite pretreatment and pH coordination control acidification production and mechanism analysis of controlling in anaerobic digestion
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摘要: 通过调节系统pH对餐厨垃圾厌氧消化酸化产物进行实验研究的结果表明，当pH为4～5时，酸化产物中乙酸占总酸累积浓度的59.83%，丙酸所占比例最低，仅为3.94%，酸化产物组成最合理，对后续产甲烷过程有利，但此时，酸化产物累积量少，酸化效率低。实验结果表明，采用热碱预处理和控制系统pH相结合的方法能够同时提高餐厨垃圾厌氧消化酸化效率和优化酸化产物组成，该方法使总VFAs累积浓度提高了68%，且酸化产物组成合理。扫描电镜的微观分析结果显示，经热碱预处理的餐厨垃圾微观结构发生了明显改变，动力学分析结果也表明，经热碱预处理后的餐厨垃圾较未经处理的餐厨垃圾厌氧产酸速度更快。Abstract: The results of experiment of influence of different pH on acidification production showed that when pH was 4～5，acetic acid was primary production，aaccounted for 59.83% of TVFAs， propionic acid was least production， only accounted for 3.94% of TVFAs， component of acid production was reasonable， it was advantage for process of methane production. However， when pH was 4～5， efficiency of acidification was lower. The experimental results showed that the method to combine thermokalite pretreatment with controlling of pH could reach the aim of promoting organic matters efficiency of acidification and optimize component of acidification production， accumulative concentration of total VFAs increased by 68%， component of acid production was reasonable，too. Results of microcosmic analysis with SEM showed that microstructure of kitchen wastes changed obviously after pretreated with thermokalite. Results of kinetics analysis showed that process of acidification of the kitchen wastes was faster than that of unpretreatment kitchen wastes.
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Key words:
- anaerobic digestion /
- acidification production /
- control /
- mechanism analysis
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