负荷对生物接触氧化修复微污染河流的影响

Impact of the Loading Rate on the Remediation of Micro-polluted Rivers by Biological Contact Oxidation Process

为考察负荷变化对于跌水曝气生物接触氧化系统修复微污染河流的影响,在重庆市高峰镇鹿山河周边建立了旁路修复系统。试验结果表明:水力停留时间由0.5 h延长至1.0 h后,系统对鹿山河中高锰酸盐指数(COD_(Mn))、氨氮(NH^(+)_(4)-N)、总氮(TN)及总磷(TP)的平均去除率显著提升,对河流的修复效果显著增强。各污染物出水浓度随进水负荷的提升而增加,两者之间具有显著的线性关系,此外,TP、NH^(+)_(4)-N的去除负荷与进水负荷近似服从对数关系。系统抗各污染物冲击负荷的能力表现为:COD_(Mn)>TP>NH^(+)_(4)-N> TN。随着跌水曝气生物接触氧化系统级数的增加,除TN外,各污染物的去除负荷均表现为一级跌水最高,二级跌水与三级跌水次之且相当;沿程出水负荷表现出逐渐降低的趋势。

To investigate the impact of load variations on the remediation of micro-polluted rivers by the water-dropping aerated biological contact oxidation system,a bypass remediation system was established around the Lushan River in Gaofeng Town,Chongqing.The results showed that after the HRT was extended from 0.5 h to 1.0 h,the average removal efficiencies of COD_(Mn),NH^(+)_(4)-N,TN and TP were significantly increased,and the restoration effect of the river were significantly enhanced.The effluent concentrations of each pollutant increase with the increase of the influent loads,and there is a significant linear correlation between them.In addition,the removal loads of TP and NH^(+)_(4)-N are logarithmically correlated with the corresponding influent loads.The ability of the system to resist the shock loads of various pollutants can be expressed as:COD_(Mn)>TP>NH^(+)_(4)-N>TN.With the increase in the stage number of the water-dropping aerated biological contact oxidation system,the removal loads are the highest in the first-level except for TN,and the removal loads of the second-level and the third-level are reduced and equal;the effluent loads along the system show gradual decrease trends.