Efficiency of removing organic pollutants from wastewater in a household wastewater treatment plant with a hybrid reactor

Abstract

The purpose of the study is to evaluate the efficiency of removing organic pollutants from wastewater in a household wastewater treatment plant with a hybrid reactor. The efficiency of the plant was analysed in terms of decreasing BOD5, COD and the content of total suspended solids in differentiated technological conditions. The variable parameter was the length of the reactor aeration phase and the dwell phase. Six different aeration variants were analysed. The efficiency of a wastewater treatment plant with a hybrid reactor in terms of reducing BOD5 oscillated from 81 to 90%, COD - 64-84%, whereas total suspended solids - 66-89% which, as a rule, was not sufficient to achieve standard levels. The best results were achieved for the following variants: 2h aeration - 2h dwell and 1h aeration - 0.5h dwell. Lower efficiency of the plant could have been attributed to operational problems, mainly failures of the plant control system and uneven conditions such as air temperature, volume and composition of wastewater received in the plant.