PENGARUH UKURAN ADSORBEN DAN WAKTU ADSORPSI TERHADAP PENURUNAN KADAR COD PADA LIMBAH CAIR TAHU MENGGUNAKAN ARANG AKTIF TEMPURUNG KELAPA

Wastewater tofu contains COD is high, it can cause environmental pollution. The objective of this research is todetermine the size of the adsorbent and the contact time of the reduced levels of COD in the effluent out with adsorbtionprocess. Manufacture of activated charcoal through physical activation process with temperature 600oC for 2 hours andthen activated using phosporic acid for 2 hours at temperature 25oC. The adsorption process is done by mixing samplesof effluent out with adsorbent with 50 ml of the sample and 5 grams of charcoal with variations in particle sizBe -70+100, -100 +170, +200 and -170 mesh and adsorption time 10, 30, 50, 70 , 90 and 100 minutes. The best results wereobtained from this research is at -170 +200 sized adsorbent and adsorption time of 90 minutes ie COD levels at 560 ppmwith a 94% reduction