摘要
为提高高原地区污水生物处理曝气过程的效率,对比研究了气压分别为96 kPa和72 kPa时,不同曝气量下,曝气方式和污泥含量对曝气池氧传质的影响规律。结果表明,曝气量从150 mL/min提高至600 mL/min,不同气压下2种曝气方式的氧总传质系数(KLa)和气压降低的负面影响均增大,相同条件时微孔曝气盘的KLa总是大于微孔曝气软管;气压降低使2种曝气方式最高动力效率和氧转移效率对应的适宜曝气量均呈下降趋势;对KLa的影响程度为曝气量>大气压力>MLSS含量,KLa与大气压力和曝气量呈正相关,与MLSS含量呈负相关;微生物耗氧速率会因气压降低有不同程度的提高,72 kPa下的比耗氧速率比96 kPa下平均高43.8%。
In order to improve the efficiency of aeration process for sewage biological treatment in plateau area, the influence of aeration modes and sludge content on oxygen mass transfer in aeration tank were compared and studied under different aeration rate when the atmospheric pressure was96 kPa and 72 kPa, respectively. The results showed that, when the aeration rate increased from 150 mL/min to 600 mL/min, the total oxygen mass transfer coefficient(KLa) of two aeration modes and the negative effects of the decrease in air pressure were all increased. And the KLa of micro-pore aeration disc was always greater than micro-pore aeration hose under the same condition. The decrease of air pressure made the optimal aeration rate corresponding to the highest dynamic efficiency and oxygen transfer efficiency of different aeration modes decrease. The degree of influence on KLa was aeration> atmospheric pressure> MLSS content. KLa had a positive correlation with atmospheric pressure and aeration rate, and a negative correlation with MLSS content. And the microbial respiration rate could increase to varying degrees due to the decrease in air pressure. The specific oxygen consumption rate at 72 kPa was 43.8% higher than that at 96 kPa on average.
作者
韩震
李淑萍
朱光灿
陆勇泽
闫刚印
李照博
HAN Zhen;LI Shuping;ZHU Guangcan;LU Yongze;YAN Gangyin;LI Zhaobo(School of Energy and Environment,Southeast University,Nanjing 210096,China;Xizang Minzu University,Xianyang 712082,China)
出处
《水处理技术》
CAS
CSCD
北大核心
2021年第6期34-38,共5页
Technology of Water Treatment
基金
西藏自治区重点研发及转化计划项目(XZ201801-GA-05)
西藏自治区科技厅项目(XZ 2019ZRG-38(Z))
西藏自治区重点研发计划项目(XZ202001ZY0052G)。
关键词
高原地区
大气压力
曝气方式
污泥含量
氧传质
plateau area
atmospheric pressure
aeration mode
sludge content
oxygen mass transfer
