Determining the Maximum Discharge of Blackwater in the Treatment Using Wetland System

This study aimed to determine the maximum discharge in the application of wastewater treatment design for blackwater. The design adopted the wetland system to reduce the level of suspended solids (TSS) and dissolved solids (TDS). Wetlands were made on a lab scale and planted with Vetiver grass (Vetiveria zizanioides) and Cattail (Typha angustifolia) as remediation agents. 120 liters of Blackwater were obtained from the Communal WWTP Tlogomas, Malang City. Data were obtained from selected parameter observations during the residence time in wetland bath for 2 days, 4 days and 6 days. The method of data analysis was using Regression analysis for determining the maximum discharge of blackwater that can be maximally processed with the treatment plant. The results showed that the levels of TSS and TDS decreased along with the increase in residence time of blackwater in the wetland. The lowest TSS and TDS levels were 0 mg/L and 700 mg/L, respectively. Both levels were obtained from the data of 6 days of residence time in wetland using Cattail. Furthermore, the results of the regression analysis with quadratic graphs suggested that the maximum discharge for TSS and TDS removal with Vetiver grass were 204.22 liters/day and 208.08 liters/day, respectively. In addition, in the wetland system using Cattail, the maximum discharge for TSS and TDS removal were 199.19 liters/day and 208.01 liters/day, respectively.