Article

fluctuant water quality and water quantity. To develop an efficient low-cost small-town sewage treatment technology, the integration of sequencing batch type bioreactor/ecosystem hybrid treatment process was chosen. In this experiment, the bioreactor unit of the process included a sequencing batch biofilm reactor (SBBR), while the ecosystem unit applied a sequencing constructed wetland (SCW) based on a polyurethane foam filler in a matrix. By changing the operation model, tests were carried out to find the key parameters of the optimal operation model for the sequencing batch type bioreactor/ecosystem hybrid treatment process in different seasons. The experiment was conducted throughout a year of operation after setup. The results showed that when the bio- and ecosystem reactors ran together in combination at a temperature of 15 °C ~ 25 °C in spring and autumn, The final effluent chemical oxygen demand (COD), ammonium nitrogen (NH₄⁺-N), and total nitrogen (TN) concentrations of the hybrid reactors were 48 mg/L, 7 mg/L, and 16 mg/L, respectively, with a corresponding total removal efficiencies of 86 %, 89 %, and 79 %. When the ecosystem reactors ran independently in the temperature range of 25 °C ~ 35 °C in the summer, the effluent COD, NH₄⁺-N, and TN concentrations were 47 mg/L, 7.3 mg/L, and 17.3 mg/L respectively, with a corresponding total removal rate of 84 %, 87 %, and 74 %. The bioreactors and ecosystem reactors ran together in combination at 5 °C ~ 15 °C in the winter and the final COD, NH₄⁺-N, and TN concentrations of the hybrid reactors effluent were, respectively, 54 mg/L, 11 mg/L, and 18 mg/L, with a corresponding total removal of 86 %, 84 %, and 76 %. The research developed an integration of sequencing batch type bioreactor/ecosystem hybrid treatment process with important realistic significance and practical value. The designed operation models are able to be used in guiding practical engineering.