Abstract
The car wash wastewater has a proportion of detergent  and it can cause considerable impacts to pollute the environment and health if they are not processed in well. SSVF CW is one of  an alternative wastewater treatment, because it has the advantage such as wastewater flowing below the surface of the media so it  reduces the smell of wastewater. The objective of this study was to determine the  removal efficiency of reducing pollutants in the wastewater of treated car wash by Constructed Wetland and the influence of Chrysopogon zizanioides rhizosphere depth in supplying DO distribution. This experimental laboratory scale study used 2 PVC for reactor. Each pipe has 4 sampling points. The DO was measured from different depth, while the other parameters were from the effluent. The ratio of the media used was  1:3:2:4 from the top to the bottom. The SSVF CW system had high TSS removal efficiency of 94.74%, while the removal efficiency of COD, Detergent, and Phosphate was76.21%, 54.54%, 30.65%, respectively. DO distribution at a depth of 84 cm in both pipes increased even though the root zone was only 26.5 cm. Â
Highlights
The increasing number of cars provides business opportunities such as car washing services in various places, especially in big cities
These compounds will later be harmful to water bodies if they are disposed of directly without prior processing, one of the effects is that it will cause a layer on the surface of the water body, namely foam produced from detergent so that it can block the process of transferring oxygen from the air into the water
The higher phosphate content will be very dangerous for the environment, because phosphate will cause eutrophication in water bodies due to uncontrolled algae growth, oxygen transfer inhibition occurs and reduces dissolved oxygen (DO) content in water bodies and will be harmful to biota or animals. microorganisms that live in water bodies (Hammer & Mark, 2014)
Summary
The increasing number of cars provides business opportunities such as car washing services in various places, especially in big cities. The level of this study was conducted media capability affects the residence time to determine the effectiveness of reducing of wastewater and will result in contact organic, phosphate, and detergent loads in car washing service waste using Chrysopogon plants.
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