Performance of constructed wetlands using Vetiveria Zizanioides for sewage treatment

Abstract

Constructed wetlands is the one of the alternatives treatment to treating domestic wastewater due to low-energy, less maintenance, and green technique treatment. Even though the application of constructed wetlands have been widely used to treating the domestic wastewater, the treatment of domestic wastewater through the constructed wetland using Vetiveria zizanioides plant is still not yet fully understood. The aim of this research to assess the performance of the Vetiveria zizanioides plant to remove the pollutants through the constructed wetland. Experimental system was carried out using two different flow systems, which are 5-day retention time a zero retention time. The design of constructed wetland plants divided by cell, for each cell was planted with Vetiveria zizanioides in different populations. The performance of treatment systems was conducted to remove the concentration of oil and grease (O&G), biochemical oxygen demand (BOD), and total suspended solids (TSS) supported with dissolved oxygen (DO), and pH, respectively. The results showed that using Vetiveria zizanioides in the constructed wetland can reduce up to 53.08% of BOD and 50.75% O&G after 60 days of treatment for 5-day retention time. Conversely, for the same 60 days of treatment, the wetland was able to remove 61.92% TSS on Day 60 at zero hydraulic retention time (HRT). From the result, the Vetiveria zizanioides plant posed a great role in removing BOD, TSS, and O&G under HRT.