Penyerapan COD, TSS, Kekeruhan dan isotherm adsorpsi pada pengolahan limbah cair tempe menggunakan karbon aktif eceng gondok (Eichornia crassipes)
Keywords:Adsorption, Water hyacinth, isotherm, activated carbon, tempeh wastewater
This study aimed to solve two environmental problems that occur in Plaju, Palembang, Indonesia. The problem was the wastewater from the tempeh industry and the growth of water hyacinth (Eichornia crassipes) which very fast. Tempeh wastewater produced by craftsmen has a high concentration, is acidic, and has a distinctive pungent odor. All this time, the liquid waste was discharged into the environment without prior processing, causing a decrease in water and soil quality. Water hyacinth is also a weed whose growth interferes with aesthetics and water transportation. One of the uses of water hyacinth was to convert it into activated carbon and used it as an adsorbent to reduce pollutants in tempeh wastewater. The research was carried out in batches on a laboratory scale by varying the adsorbent dose (1, 3, 5 g). Analysis of the values of COD, TSS, turbidity and pH was carried out on the initial sample and after the adsorption process. The research data was used to calculate the percentage of adsorption of the adsorbent and the adsorption isotherm that took place. The results showed that activated carbon of water hyacinth was able to reduce 26% COD, 73% TSS, and 79% turbidity. Tempeh waste conditions are still in the acidic pH range, which is between 4.21-4.59 in all variations of dose and time. The adsorption process in tempeh wastewater treatment follows the Langmuir isotherm model with a maximum adsorption capacity of 1.98-12.3 mg/g. This proves that water hyacinth activated carbon can be an alternative adsorbent in the processing of tempeh wastewater.
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