Abstract:

The A/O-MBR process has been used for treating oil shale retorting wastewater. The removing states of COD and NH₄⁺-N in the starting period of the reactor are investigated. The influences of sludge mixed liquid reflux ratio,C/N ratio and inflow modes during stable period on the removing rates of COD,NH₄⁺-N,and TN are discussed. The results show that when the mixed liquid reflux ratio is between 300%~700%,the TN removing rate increases from 87.67% to 95.99%,but when the mixed liquid reflux ratio is increased to 900%,it has little influence on wastewater treatment effect. The removing rates of wastewater COD and TN increase with the increase of influent C/N ratio. When C/N ratio is increased from 3 to 8,the removing rates of COD and TN increase from 91.39% and 82.81%,respectively,to 96.33% and 92.21%,respectively. When the influent C/N ratio is 3,using step feed,the wastewater TN removing rate is 90.05%. The wastewater treatment effect can thus be improved.

Key words: A/O-MBR, oil shale retorting wastewater, mixture reflux ratio, C/N ratio, inflow modes

摘要：

采用缺氧/好氧-膜生物反应器（A/O-MBR）工艺处理油页岩干馏废水，考察了启动期反应器中COD和NH₄⁺-N的去除情况，探讨稳定期污泥混合液回流比、碳氮比和进水方式对COD、NH₄⁺-N、TN去除效果的影响。结果表明，混合液回流比为300%~700%，TN去除率由87.67%提高至95.99%，但混合液回流比提高至900%时，其对废水处理效果影响不大。废水COD和TN的去除率随进水碳氮比的升高而提高，碳氮比由3提高至8，COD和TN的去除率分别由91.39%、82.81%提高至96.33%、92.21%。进水碳氮比为3，采用分段进水，废水TN去除率为90.05%，可提高废水处理效果。

关键词: A/O-MBR, 油页岩干馏废水, 混合液回流比, 碳氮比, 进水方式

CLC Number: 

• X703