Domestic wastewater treatment by using jasmine-wetland pilot model

Tóm tắt

The experimental model is Horizontal Subsurface Flow Constructed Wetlands that is designed as a frustum shape with the bottom is 1350mm long and 315mm wide, the top has a length of 1800mm and a width of 765mm. On the surface, there is jasmine growing with the density of 16 plants /m² and the slope of the model is 1%. Corresponding to the monitored flow rate of wastewater, which are 85 L/day and 115 L/day respectively, the organic loading rate is 150 kgBOD₅/ha.day and 200 kgBOD₅/ha.day. The results of the study showed that the BOD₅ loading rate of 150 kgBOD₅/ha.day and the flow rate of 85 L/day, the average processing performance value of TSS, COD, TKN, P_PO₄^3-, N_NH₄⁺ is 92.67%, 82.40%, 75.3%, 60.04%, 80.12%, respectively. With the BOD₅ loading rate of 200 kgBOD₅/ha.day and the flow rate of 115 L/day, the average processing performance value of the TSS, COD, TKN, P_PO₄^3-, N_NH₄⁺ is 90.96%, 68.16%, 60.75%, 50.26%, 65.23%, respectively. Also, this model is equipped with a discontinuous aeration system at the flow rate of 85 L/day to increase the treatment efficiency of COD, TKN, N_NH₄⁺ to 86.05%, 79.64%, 84.29%, respectively.