KALIDAMI RETENTION PONDS PHYTOREMEDIATION WITH NUTRIENT ADDITION FROM SCENEDESMUS SP: A MICROLAGAERHENNY RATNAWATI, INDAH NURHAYATI, NARESWARA TITIS AND NUR INDRADEWI OKTAVITRIAbstract Retention pond is an estuary water body. Water travels through many point sources that are dominated with domestic wastewater. In a big city such as Surabaya that has quite a big number of population, there are more wastewater discarded into water bodies. Generally, various algae and microalgae species are found in the water of retention ponds. Due to those reasons, this study analyzed the utilization of microalgae Scenedesmus sp in the treatment of water with high levels of nutrient and organic matter. Kalidami retention pond was used as the research area. The purpose of this study is to discover the effect of Potassium (K) and Carbon (C) on dissolved oxygen (DO) and chlorophyll-a. The study was conducted on a laboratory scale with a batch system and continuous aeration. Microalgae were cultured until 3.5 mg/L of chlorophyll-a was obtained. Phycoremediation was carried out by adding elements K and C. The results of this study show that the reactors added with 3% of K and 29.41 mg/L of C acquired the highest concentrations of DO at 7.70±0.14 mg/L and chlorophyll at 8.88±0.12 mg/L. |