摘要
针对城市污泥厌氧消化由于融胞困难所导致的消解速率低、产气量低等问题,采用热水解与超声组合的方法对污泥进行预处理,考察经预处理后污泥融胞效率的变化及对厌氧消化产气潜力的影响。结果显示,热水解与超声波组合工艺对污泥的破胞作用明显,在30min热水解与0.53W/mL超声声能密度组合工艺反应60min条件下,相对于处理前污泥,预处理后污泥溶解性COD(SCOD)溶出率可提高41.6%,蛋白质增加值达282.7mg/L,污泥厌氧消化的产气潜力显著增加;30min热水解分别与0.53、0.33W/mL超声声能密度组合工艺对污泥破胞效率的差异不大;随着超声时间的延长,在组合预处理工艺前20min内SCOD的溶出速率较慢,20～60min时溶出速率逐渐提高。试验结果可为城市污泥厌氧消化预处理工艺的选择提供一定的理论依据。
Urban sludge anaerobic digestion had the problems of low digestion rate and low gas production be cause of the difficulty of sludge cell disintegration. Thermal hydrolysis combined with ultrasonic irradiation was adap ted to pretreat sludge so as to enhance the cell disintegration efficiency and further improve the sludge digestion per formance. The results showed that the designed pretreatment technology had the obvious effect on the sludge cell dis integration. After 30 min of thermal hydrolysis and then irradiated under 0.53 W/mL of ultrasonic energy density for 60 rain,the SCOD dissolution rate of pretreated sludge was increased by 41.6% ,protein in supernatant reached 282.7 mg/L, and the biogas potential of anaerobic digestion process was greatly improved. The sludge cell disintegration ef ficiency presented insignificant difference when decrease the ultrasonic energy density from 0. 53 W/mL to 0. 33 W/mL. The dissolution of SCOD was relative slow in the first 20 min of ultrasonic irradiation,and then SCOD disso lution rate increased gradually in the following 20- 60 rain. The experimental results can provide a theoretical basis for the selection of pretreatment process for city sludge anaerobic digestion.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2013年第9期71-74,共4页
Environmental Pollution & Control
关键词
热水解
超声波
污泥预处理
SCOD
蛋白质
thermal hydrolysis ultrasonic pretreatment of sludge SCOD protein
