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Biogas, a renewable energy source, is produced from biomass decomposition and shares properties with natural gas, allowing for easy storage and transport. Co-Anaerobic digestion (Co-AD) is a cost-effective method for bigas recovery. Coffee grounds (CG), rich in organic matter, and septic tank sludge (STS), a byproduct of wastewater treatment, contain essential compounds and bacteria that facilitate the AD process, making them suitable for biomethane production. Therefore, this study was carried out to determine the physical properties of both substrates and identify the biogas recover value through Co-AD of both samples. The process was performed at mesophilic conditions 26°C to 32°C for 5 days and optimization of waste composition were varying with ratio CG:STS (1:2; 2:1, 1:1.5; and 1.5:1). While, optimization of pH was 6.5, 7.0, 7.5 and 8.0. The TS values for CG and STS were 34.23% (±0.05) and 30.12% (±0.06), respectively. While the VS values for CG and STS were 85.67%(± 0.06)  and 85.32% (± 0.02),respectively. This shows the suitability of both substrates to undergo the Co-AD process. Result for biogas recovery found that Co-AD between CG and STS show the highest biogas recovery with ratio CG:STS (2:1) at day 3 with value 282.6mL (±0.07). While pH optimization shows pH 7.5 recovery the highest biogas at day 2 with value 297.56 mL. These results suggest that optimization enhanced the synergetic effects of facultative anaerobic bacteria, which play a significant role in enhancing biogas recovery in a short period. This study also provides insights into new strategies for improving biogas.