Utilization of H₂SO₄ Activated PDAM Sludge as an Adsorbent with Alum Addition for Reducing COD and BOD in Batik Wastewater from Kutawaru, Cilacap
DOI:
https://doi.org/10.32493/jitk.v10i2.58425Keywords:
PDAM sludge, acid activation, batik wastewater, adsorption, alum dosageAbstract
This research aims to utilize PDAM Cilacap sludge waste as an adsorbent to treat wastewater from the batik industry from Kutawaru, which has levels of Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) that exceed quality standards. The sludge was chemically activated using 2 M H₂SO₄, then applied through laboratory-scale experiments with variations in alum doses (1, 2, and 3 g). The treatment results showed a significant decrease in the pollutant load. The initial BOD level of 1,800 mg/L decreased to 239-241 mg/L (86.6% efficiency), while the COD level decreased from 2,688 mg/L to 348-449 mg/L (83.3% efficiency). The adsorption and neutralization process also succeeded in raising the pH from 3.0 to 6.8-7.2 and effectively clarified the color of the waste. Although effluent has not fully met quality standards, activated PDAM sludge has proven to be promising as a low-cost and environmentally friendly adsorbent alternative to reduce organic pollutants from batik waste.
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