摘要
气体的转移是废水处理过程中的重要环节,基于气体转移的“双膜理论”,采用在反应器中清水曝气的方法,对新型生物流化反应器进行了氧转移特性的研究.结果表明,在实验范围内,随着曝气量的增大,氧传质系数呈直线上升;投加载体后,随着载体量的增加,氧传质系数降低.在新型生物流化反应器不同运行方式下,随着Ad /Ar(降流区与升流区面积比)变大,反应器中氧传递效果变差.新型生物流化反应器氧利用率可以达到10%,充氧动力效率可以达到5.5kgO2/(kWh).并且在载体浓度较高和空塔气速较大时,新型生物流化反应器氧利用率和充氧动力效率没有明显降低.
Gas transfer is an important part of wastewater treatment process. Based on the double-film theory, the oxygen transfer character was studied in a new type of structure modified biological fluidized reactor (SMBFR), adopting clean water aeration in the reactor technique. In the range of experiment, the oxygen transfer coefficient KLa has a directly proportional relationship with the aeration degree increasing; after the carrier is added, with increasing of the carrier amount, KLa will reduce. Under different type of SMBFR operation, the oxygen transfer efficiency decreases with increases of Ad/Ar (the area ratio of flow-decreasing area to flow-increasing area) oxygen utilization ratio EA can reach 10%, and the power efficiency of oxygen supply Ep can reach 5.5kgO2/(kWh) in SMBFR. In addition, with the carrier concentration and air velocity supply higher, EA and Ep will not decrease obviously.
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
2003年第5期547-551,共5页
China Environmental Science
基金
"863"计划资助项目(2002AA601200)
关键词
生物流化反应器
氧传质系数
氧利用率
充氧动力效率
双膜理论
biological fluidized reactor
oxygen transfer coefficient
oxygen utilization ratio
power efficiency of oxygen supply
double-film theory
