摘要
研究中试微孔曝气氧化沟内清水和活性污泥混合液中溶解氧的传递特性,考察了曝气器布置方式(交叉式、并排式和集中式)对清水和污泥混合液中氧传质效率的影响。结果表明,清水和活性污泥混合液中,交叉式曝气器布置方式下的氧传质效率最高,且交叉式>并排式>集中式。在活性污泥混合液中,DO浓度在1.3~1.7 mg/L之间时,三种曝气方式下脱氮消耗的氧气量基本相同,曝气器布置方式对COD的耗氧量变化的影响较大;活性污泥混合液中的氧传质效率OTE相对较低,活性污泥混合液中的OTE相比于清水中的SOTE受曝气器布置方式的影响偏小。活性污泥混合液和清水中传质速率比值Z在集中曝气方式下最大,在交叉曝气方式下最小。
The experimental study of oxygen transfer performance of clean water and activated sludge mixed liquor in a pilot-scale oxidation ditch of microporous aeration had been carried out. The effect of different aerator arrangement modes(cross, abreast and centralized) on oxygen transfer efficiency were investigated in the experiment. Moreover, the standard oxygen transfer efficiency(SOTE) and oxygen transfer efficiency(OTE) were used as parameters of oxygen transfer performance in the clean water and activated sludge mixed liquor, respectively. The results showed that the oxygen transfer efficiency was affected by the aerator arrangement mode significantly, and the oxygen transfer performances between clean water and activated sludge mixed liquor were different. The oxygen transfer efficiency under the cross aerator arrangement mode was the highest, the abreast aerator arrangement mode was the second, and the centralized aerator arrangement mode was the lowest. In the activated sludge mixed liquor, when the DO concentration was between 1.3 mg/L and 1.7 mg/L, the oxygen consumption of nitrogen removal in different aerator arrangement modes was almost the same. However, the aerator arrangement mode had greater impact on oxygen consumption of COD removal. Compared to the SOTE in the clean water, the OTE in the activated sludge mixed liquor was lower, and the OTE was about 85% of SOTE. Moreover, the OTE was less affected by the aerator arrangement mode than SOTE. To evaluate the aeration performance in the activated sludge mixed liquor, the ratio Z(OTE/SOTE) of oxygen transfer efficiency between the activated sludge mixed liquor and clean water was introduced. Contrary to the regularity of oxygen transfer efficiency under different aerator arrangement modes, the OTE/SOTE was the largest in the centralized aerator arrangement mode and the smallest in the cross aerator arrangement modes. The OTE and SOTE was close under the aerator arrangement mode of low oxygen transfer efficiency.
作者
许晓飞
魏文泽
董鑫
刘凤霞
魏炜
刘志军
Xiaofei XU;Wenze WEI;Xin DONG;Fengxia LIU;Wei WEI;Zhijun LIU(Research&Design Institute of Fluid and Powder Engineering,Dalian University of Technology,Dalian,Liaoning 116024,China;School of Energy and Power Engineering,Shenyang University of Chemical Technology,Shenyang,Liaoning 110142,China)
出处
《过程工程学报》
CAS
CSCD
北大核心
2021年第4期394-400,共7页
The Chinese Journal of Process Engineering
基金
国家自然科学基金资助项目(编号:11502046)
辽宁省博士科研启动基金项目(编号:201501179)。
关键词
中试氧化沟
清水
活性污泥混合液
曝气器布置方式
氧传质效率
pilot-scale oxidation ditch
clean water
activated sludge mixed liquor
aerator arrangement
oxygen transfer efficiency
作者简介
许晓飞(1981-),男,辽宁省大连市人,博士,副教授,化工过程机械专业,E-mail:xiaofei.xu@dlut.edu.cn;通讯联系人:刘志军,liuzj@dlut.edu.cn.
