PENURUNAN KONSENTRASI CHEMICAL OXYGEN DEMAND (COD) PADA LIMBAH CAIR INDUSTRI TEMPE MENGGUNAKAN METODE ELEKTROLISIS DENGAN ELEKTRODA KARBON

Abstract

Telah dilakukan penelitian tentang penurunan konsentrasi Chemical Oxygen Demand (COD) pada limbah cair industri tempe dengan metode elektrolisis menggunakan elektroda karbon. Limbah cair industri tempe mengandung konsentrasi COD yang sangat tinggi, sehingga perlu dilakukan pengolahan sebelum limbah dibuang ke lingkungan. Penurunan konsentrasi COD ini dilakukan di dalam reaktor sel elektrolisis dan dilengkapi dengan elektroda karbon yang dihubungkan ke sumber arus DC. Pada penelitian ini dilakuan variasi waktu, potensial, dan elektrolit untuk mengetahui pengaruh terhadap penurunan konsentrasi COD. Hasil dari proses elektrolisis dianalisis menggunakan Spektrofotometer UV-Vis. Hasil penelitian menunjukkan bahwa waktu, potensial, dan elektrolit sangat berpengaruh terhadap penurunan konsentrasi COD. Presentase penurunan konsentrasi COD optimum yaitu sebesar 65,12% pada saat elektrolisis dengan waktu 3 jam, potensial 7 V, dan elektrolit NaCl.

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Degradation of tempe industrial liquid waste by electrolysis method using carbon electrodes has been done. Tempe industrial liquid waste has a very high concentration of COD, so it is necessary to process the waste before it’s being discharged into the environment. The COD concentration reduction process was performed an electrolysis reactor, equipped with carbon electrodes which was connected to the DC current source. In this research, variation of electrolysis times, potentials and electrolytes were observed to determine the effect on the decrease in COD concentration. The sample of electrolysis process was analyzed by using UV-Vis Spectrophotometer. The results showed that electrolysis time, potential, and electrolyte were significantly affected the decrease of COD concentration. The percentage decrease of optimum COD concentration was 65.12% at the time of electrolysis of 3 hours, potential of 7 V, and NaCl electrolyte.