摘要
以运行费用作为膜生物反应器(MBR)运行经济性的考核指标,建立了MBR运行费用的计算模型,重点考察了膜通量、曝气强度、抽停时间、混合液悬浮固体质量浓度等操作条件对MBR运行经济性的影响。结果表明,膜通量在临界值5L/(m2.h)时运行费用处于最低值;曝气强度过高或过低都会使系统运行费用增加,而经济曝气强度(气水比)为30∶1;当抽吸时间≤12min、停抽时间≥3min时,运行费用变化缓慢,但抽吸时间或停抽时间超过临界值后,运行费用迅速上升;混合液悬浮固体质量浓度高于5.0g/L时,运行费用随混合液悬浮固体质量浓度增加迅速递增。工程运行表明,运行费用模型预测值与实际值具有较好的一致性。指数0.
The present paper aims to introduce the author＇s investigation of the impact of operating conditions on the membrane bioreactor＇s （MBR） economic feasibility. As is known, MBR is a kind of wastewater treatment technology with better effluent quality though its comparatively higher operating cost and membrane fouling constrains its wide application. Based on the study of its operating cost appraising index and considering both the its module replacing cost and energy consumption, the paper has established a calculating model of its operating cost, which helps to conclude that the membrane flux, aeration intensity, suction/suspended time and MISS all contribute to its operating cost. Meanwhile, the paper has also done laboratory experiments on the influence of the different conditions on its cost. Thus, the results of our research indicate that there is a critical membrane flux of 5 L/（m^2· h） which helps to reduce the operating cost to the lowest degree. The reason for increasing the operating cost comes from the too high or too low aeration intensity, which influence the control of the membrane fouling and energy consumption, whose ratio is about 30：1 in the given study. However, it is an effective way to control the membrane fouling and reduce the energy consumption through batch operation, when the suction time ≤ 12 min and suspended time ≥ 3min. The operating cost would increase sharply with the increase of MISS when it is higher than 5.0 g/L. Thus, our research proves that there is a better consistence of operating cost between the model oredicting value and the real ooerating value.
出处
《安全与环境学报》
CAS
CSCD
2006年第5期72-74,共3页
Journal of Safety and Environment
基金
江苏省建设厅资助项目(JS200308)
关键词
环境工程
膜污染
膜通量
曝气强度
抽停时间
混合液悬浮固体浓度
environment engineering
membrane fouling
membrane flux
aeration intensity
suction/suspended time
mixed liquid suspended solids
