Chromium Removal from Waste Water from COD Analysis Using Tannin Adsorbent from Guava Leaves

Usarat Kumtabtim, Pornthip Sornsathian, Orawe Pichrugul, Nantanit Yimwasana


The study of chromium removal of wastewater after Chemical Oxygen Demand (COD) analysis with tannin adsorbent from Guava leave is divided into two parts. The first part consists of the study of tannin extraction using mixed solvent including 60% acetone and 80% ethyl alcohol. The ratio between weight of Guava leave and volume of mixed solvent was 500:2000 gram per milliliter. The second part is the study of optimum condition for chromium removal of wastewater from COD analysis with tannin adsorbent from Guava leave by bath process. In this study, the initial chromium concentration of wastewater from COD analysis was 398.71 ppm. The optimum condition for chromium removal was 3 g of tannin adsorbent, initial pH of solution at 1, adsorption time of 3 hours with shaking speed of 100 rpm at room temperature. With the optimum condition, the chromium removal efficiency from wastewater with tannin adsorbent from Guava leaves as 95.3 percent.


Chromium removal, Guava leaves, Tannin, Waste water treatment

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