反应时间和碳磷比对单级好氧除磷的影响-《郑州大学学报(工学版)》

文章信息/Info

Title:: Impacts of Reaction Time and C/P Ratio on Single Aerobic Phosphorus Removal System

Author(s):: Peng Zhaoxu; Han Wei; Peng Zhiyuan; Lei Zhichao; Chen Gan; College of Water Conservancy and Environment, Zhengzhou University, Zhengzhou, Henan 450001

Keywords:: Biological phosphorus removal. Single stage aerobic; Carbon/p; Low dissolved oxygen; ORP

摘要:: 为了研究单级好氧除磷工艺的影响因素，采用序批式间歇反应器（SBR），通过设定不同的反应时间和进水C/P，考察了单级好氧过程中PO43--P浓度、聚-β-羟基丁酸盐（PHB）以及DO、ORP等在线参数的变化。结果表明，在DO浓度低于0.6 mg•L-1的单级好氧系统中，存在着稳定的生物除磷现象，且适当地缩短曝气时间有助于强化除磷效果。C/P与除磷的关系比较复杂，当PO43--P浓度恒定时，增加C/P比可显著强化放磷和吸磷过程；当碳源浓度恒定时，增加C/P比对强化除磷的作用有限。进水末期污泥中的PHB含量与放磷量近似成正比，而与进水C/P比关系不大。ORP的变化趋势能够清楚地指示除磷的进展过程，当ORP小于-150mv时，系统会发生显著的磷释放。在低溶解氧环境下，传质受限产生的厌氧微环境是发生单级好氧生物除磷的重要原因。

Abstract:: In order to investigate the impact factors of single aerobic phosphorus removal process, sequencing batch reactor (SBR) was applied. Through altering reaction time and influent C/P, variations of PO43--P concentration, poly-β-hydroxybutyrate (PHB), on line parameters such as DO and ORP were investigated. The results showed that, when DO was below 0.6 mg•L-1, stable biological phosphorus removal was existed in single aerobic system. And decrease aeration time properly was helpful to enhance the phosphorus removal effect. The relation between C/P and phosphorus removal was complex, when PO43--P concentration was constant, increase C/P could enhance the processes of phosphorus release and uptake significantly; when carbon source concentration was constant, the effect of increase C/P was limited. The sludge PHB content at the end of feeding period was in proportion to the released phosphorus content, and showed little relation with influent C/P. The variation tendency of ORP could distinctly indicate the phosphorus removal progress, when ORP was below -150mv, significantly phosphorus release would happen. Under low DO condition, the micro-anaerobic environment caused by mass transfer resistance was the key reason for the take place of single biological phosphorus removal.