低强度超声波预处理对厨余垃圾厌氧消化的影响  

Efficiency of anaerobic digestion of kitchen waste by low intensity ultrasound pretreatment

作　　者：冯磊[1] 李润东[1] 

机构地区：[1]沈阳航空航天大学,辽宁省清洁能源重点实验室,沈阳110136

出　　处：《环境工程学报》2012年第9期3280-3286,共7页Chinese Journal of Environmental Engineering

基　　金：国家“973”重点基础研究发展规划项目(2011CB201500);沈阳市科技计划项目(F10-133-6-00)

摘　　要：以厨余垃圾为研究对象,实验研究产气效率、pH、SCOD、甲烷浓度及生物降解率5个参数的变化趋势,比较低强度超声波处理对厨余垃圾厌氧消化产气特性的影响,结果表明:(1)低强度超声波处理对厨余垃圾厌氧消化产生明显效果,在不同的超声波强度(100、175和250 W)或处理时间(20和40 min)下,产气效率、累计产气量、pH下降幅度、SCOD增加幅度随处理时间和超声功率增加而增加;在超声波强度250 W和处理时间60 min下出现抑制作用;(2)在超声波强度250 W和处理时间40 min条件下,超声波对厨余垃圾厌氧消化增强效果最明显,累计产气量由未处理的3 513 mL提高至5 007 mL,提高42.6%,甲烷气体浓度由51.25%提高至58.8%,生物降解率由58.11%提高至73.5%.The characteristics of the high-energy biogas generation through anaerobic digestion（AD） of kitchen waste pretreated by low intensity ultrasound were introduced.Gas production rate,pH value,SCOD,methane concentration and biodegradability were monitored during AD experiment.The results show that there was an obvious effect of pretreatment with low intensity ultrasound on the anaerobic digestion of kitchen waste,under the same ultrasound intensity（100,175 and 250 W） and treating time（20 and 40 min）,the gas production rate,accumulated gas production,decline of pH and increase of SCOD were along with ultrasound intensity and treating time.Under ultrasound intensity of 250 W and treating time of 60 min,there was a inhibitory effect on AD.There was a best efficiency under ultrasound intensity of 250 W and treating time of 40 min,the accumulating gas production increased by 42.6%,from 3 513 to 5 007 mL,the CH4 concentration and biodegradability increased from 51.25% to 58.8% and 58.11% to 73.5%,respectively.

关 键 词：厨余垃圾 超声波 预处理 厌氧消化 

分 类 号：X172[环境科学与工程—环境科学]