The discharge of liquid waste from rubber industry poses a signi cant threat to human beings and environment; therefore, it ought to be addressed. Meanwhile, activated sludge technologies are usually used in Indonesia by this industry to handle liquid waste and tackle discharge issues. The combined adsorbents and hybrid membrane UF/RO were proposed in this study to decrease contaminants parameter of rubber industry wastewater (RIW). Furthermore, to achieve this goal three steps of treatments were applied in the current experiment. The rst step is ltration using sand lter columns containing silica sand and activated carbon. In addition, the second stage is categorized by adsorption using three types of adsorbents, namely calcium carbide residue (CCR), coal y ash (CFA) and bentonite. The third stage is separation process using adsorbents and UF/RO. This investigation was conducted using three types of adsorbents arranged in series con guration followed by UF/RO.

Results showed that combined adsorbent (CCR-CFA-bentonite) followed by UF/RO membranes increases the acidity of RIW from 4.70 to 7.28 with removal e ciency of turbidity, chemical oxygen demand (COD), biological oxygen demand (BOD), total suspended solid (TSS), ammonia-nitrogen (AN), and total nitrogen (TN) at 99.0, 88.1, 92.5, 89.5, and 67.5%, respectively.