Penurunan Kadar Natural Organic Matter menggunakan Granular Activated Carbon Dievaluasi melalui Metode Spektrofluorometer

Abstract

The presence of Natural Organic Matter in a water source can affect the performance of drinking water processes as well as the quality of the water produced. It is caused by the properties of NOMs that act as pollutant carriers or precursors in embedding disinfectant by-products. (DBP). Therefore, the reduction of NOM concentration in drinking water supply through simple adsorption process is necessary. The adsorption process in this study was carried out in batches using an adsorbent of coconut and coal of 8 mesh size against a synthetic sample water adsorbates in concentrations of 10 mg/L, 15 mg/l, and 20 mg/ L obtained from the addition of fulvic acid compounds. To optimize this NOM reduction process, it is important to measure and characterize NOM through Spectrofluorometric method with emission-existence matrix (EEM) analysis technique in representing Fulvic acid-like, Humic acid-like, Tyrosine-like, and Tryptophan-like. The optimum dose in the reduction of NOM levels for both types of absorbents is at the mass of the adsorbent 12.5 grams with a sample volume of 250 mL. Whereas the optimum contact time for coconut and coal bars is 30 minutes and 120 minutes. The fluorescence intensity of the adsorbent used will show the efficiency value. Based on the three concentrations used, the fluorescence reduction efficiency was higher for fulvic acid and humic than tyrosine and tryptophan. This is due to differences in the nature of the fractions. And coal GAC adsorbent is more efficient than coconut shell, this is because there is a difference in the pore size of the adsorbent which determines the amount of NOM absorbed.