INTERNATIONAL JOURNAL OF SCIENTIFIC & TECHNOLOGY RESEARCH VOLUME 9, ISSUE 01, JANUARY 2020 ISSN 2277-8616 1466 IJSTR©2020 www.ijstr.org Removal Of Bod And Cod Concentration In Wastewater Using Constructed Wetland Mutia Febry Haryani, Melati Ferianita Fachrul, Rositayanti Hadisoebroto Abstract: Wastewater from household activities which is directly discharged into the sewers in settlements can be the cause of surface water pollution, which in turn has a harmful impact on the community This study aims to analyze the removal concentration of BOD and COD organic matter in household wastewater before being discharged into the river flow. Wastewater that directly enters the river can cause river water pollution, and thus it needs to be treated. The treated wastewater comes from residents' domestic activities in RW 08, Srengseng Sawah Village, South Jakarta. Treatment conducted using Constructed Wetland with a Sub-Surface Flow (CW-SSF) system with Echinodorus palaefolius and Vetiveria zizanioides plants. The method used to acclimatize the plants and then move the plants to the SCW-SSF unit, then analyze the quality of wastewater with a detention time of 2 days. The statistical calculation in this study used Analysis of variance. The result of this study shows that the removal efficiency of the BOD concentration is 50% while the COD concentration is 25%. This shows that treatment with constructed wetland can be used to remove the concentration of BOD and COD in grey water from domestic activities. Index Terms : Domestic wastewater, BOD, COD, Echinodorus palaefolius, Constructed Wetland, Removal, Vetiveria zizanioides ——————————  ————————— 1 INTRODUCTION Waste water is a liquid or waste from households, industries and other public places that contain materials that can endanger the lives of humans and other living things and interfere with environmental sustainability [1]. Domestic wastewater is water that has been used by humans and contains all the ingredients added to the water during its use [2]. Wastewater from household activities which is directly discharged into the sewers in settlements can be the cause of surface water pollution, which in turn has a harmful impact on the community. In addition, other human activities such as industrial activities, agriculture and animal husbandry can also produce wastewater. According to UN WWAP, wastewater generated from human activities in the world can reach a volume of around 1,500 km3 per year [3]. The large amount of wastewater that enters the water body can be a serious problem in the surface water ecosystem, which is the river that will flow into the sea, as it is known that most people in Indonesia in general still use river water [2]. Domestic wastewater can be divided into 2 types, namely blackwater that comes from toilet waste, which amounts to 20% of total wastewater, while greywater is wastewater that comes from kitchens, bathrooms, and laundry waste totaling 80% of total wastewater [5]. Wastewater that generally enters the river is greywater wastewater which is discharged directly into the drain and finally into the river. Polluted rivers will result in loss of ecological balance in the river flow, and therefore can cause various losses for living creatures around it as well as humans. Therefore, before the water enters the river body, domestic wastewater should be treated to reduce the level of pollutants contained in the wastewater. Treatment can be initiated by knowing the condition of water quality by conducting water quality testing based on the physical chemistry of water, in which later would be able to clearly understand the effects caused by human activities [6]. One of the inexpensive and efficient processing that can be applied in cities in Indonesia is with constructed wetland technology. Constructed wetlands is a wastewater treatment system process which uses the performance of plants and planting media. The constructed wetlands have 2 types of flow systems namely surface flow and subsurface flow [7]. Constructed Wetland Surface flow type is the surface flow where water flows above the planting medium with plants floating above the surface of the water, while subsurface flow is where water flows under the surface through the pores of the growing media, such as gravel and soil [7]. Based on the flow pattern, constructed wetlands have 2 types, namely horizontal and vertical. Constructed wetlands is one of the waste treatment systems that is designed and built involving water plants and growing media. Wetlands are divided into 2 types namely surface flow which is the surface flow where water flows over the media with plants floating above the water surface. Sub surface flow is the flow under water where water flows below the surface through cavities in the planting medium [8]. Vertical flow in constructed wetlands is often used to treat domestic wastewater, especially for the allowance limit for ammonia-nitrogen [9]. Plants can be used for phytoremediation through various physiological processes that allow metal tolerance and absorption capacity [1]. Plants that can be used as phytoremedians are Echinodorus paleafoliu and Vetiveria zizanioides are aquatic plants that are known to reduce metal content in wastewater [10]. The process of plants in reducing pollutant levels is a symbiosis with microorganisms that convert complex compounds into simpler compounds and are used by plants as nutrients. Vetiveria zizanoides is well known as an eco-frendly plant that prevents soil erosion and rehabilittates metalliferous polluted land, vetiveria zizanoides is als the major source of vetiver oil for medicine and perfumery [4]. Echinodorus palaefolius is also well known or its capability in reducing nutrients of domestic wastewater [11] Famous aquatic plants can reduce concentration levels of pollutants in the environment. Some water plants that can absorb heavy metals include water hyacinth, kayambang, lotus and others. Aquatic plants can reduce levels of heavy metals including chromium (Cr) in the _____________________________________ • Melati Ferianita Fachrul, Lecturer in Department of Evironmental Engineering. Universitas Trisakti, Indonesia. Corresponding Author E- mail: melati@trisakti.ac.id • Rositayanti Hadisoebroto, Lecturer in Department of Environmental Engineering. Universitas Trisakti. Indonesia. rositayanti@trisakti.ac.id • Mutia Febry Haryani. Student of Department Environmental Engineering. Universitas Trisakti. Indonesia. febrymutia@yahoo.co.id