In order to further improve the operation effect of A2O wastewater treatment process in cold areas,wastewater treatment plant A located in cold area was taken as a case to study a kind of improved A2O process with multi-point inlet and multi-point reflux characteristics of mixed liquid,which is suitable for wastewater treatment plants in cold areas,and the design key points and operation technical parameters of the process were determined from multiple perspectives.From the practical application effect,the improved A2O process can still achieve better removal effect under cold conditions,which can provide reference for subsequent related work.
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