The Removal of Organic Materials and Nutrients with Addition of Artificial Supporting Materials in The Water Body (A Case Study of Cikapayang River, Bandung City Hall)

Cikapayang River is a branch from Citarum River that flows across Bandung City, starting from Dago to Riau Street. Ninety percent of the community living around the river dispose of domestic wastewater directly into a water body without any treatment. This condition causes a decline in river quality. Various technological efforts have been made to enhance the water quality in the river, including efforts in dealing with pollution prevention from the source treatment in the water body. One of the technical options in providing therapy in the water body is using the filtration with supporting materials. It is hoped that through this supporting material, physical, chemical, and biological processes will occur, so that organic material and nutrients can be eliminated. In this study, removal of organic materials and nutrients was carried out by using artificial supporting materials in Cikapayang River with two different sizes, Block I is 350x15x100 cm, and Block II is 325x15x100 cm. Cikapayang River quality is classified as lightly pollute based on PI calculation. The average removal efficiency of Block I is 50% COD, 33% TSS, 23% TP, and 39% TN, meanwhile Block II has a removal efficiency of 38% COD, 30% TSS, 28% TP, and 49% TN. The difference in material surface area between the two materials causes different removal efficiency. But these results indicate that the content can be used to remove organic materials and nutrients. The addition of artificial support material in Cikapayang River can reduce IP value, from 4.74 to 3.71.