The study assessed the impact of volatile fatty acids (VFA) to total alkalinity (TA) ratio (VFA/TA), and percentage volatile solids (VS) reduction of batch and semi-continuous anaerobic co-digestion of palm nut paste waste (PNPW) and anaerobic-digested rumen waste (ADRW) on digester stability and biogas production under the environmental condition of 50 ± 1°C and hydraulic retention time of 21 days for the batch studies and 14 days for semi-continuous co-digestion. The co-digestion ratios were based on percentage digester volume corresponding to 90%:10%, 75%:25% and 50%:50%. During batch and semi-continuous anaerobic co-digestion, VFA/TA of 0.32–1.0 and VS reduction of 53–67% were observed as the stable range at which biogas production was maximum. In terms of semi-continuous anaerobic digestion (AD), except for the 50%:50% ratio where biogas production progressed steadily from the first to fourteenth days, biogas production initially dropped from 180.1 to 171.3 mL between the first and third days of the 90%:10% reaching a maximum of 184 mL on the fourteenth day. Biogas production declined from 198.8 to 187.5 mL on the second day and then increased to 198.8 ± 0.5 mL in the case of the 75%:25% with a significant difference between the treatment ratios at p < 0.05. Therefore, the study can confirm that the 50%:50% ratio (PNPW:ADRW) is a suitable option for managing crude fat-based waste under thermophilic AD due to its potential for rapid start-up and complete biodegradation of active biomass within a 21-day period. This presupposes that residual methane as greenhouse gas will be void in the effluent if disposed of.

这项研究评估了挥发性脂肪酸（VFA）对总碱度（TA）比（VFA / TA）的影响，以及棕榈果仁糊废料（PNPW）分批和半连续厌氧共消化的挥发性固体百分比（VS）的降低）和厌氧消化的瘤胃废物（ADRW）在50±1°C的环境条件下的蒸煮器稳定性和沼气产量以及分批研究的水力停留时间为21天和半连续共消化为14天。共消化率基于消化器体积百分比，分别对应于90％：10％，75％：25％和50％：50％。在分批和半连续厌氧消化过程中，观察到VFA / TA为0.32–1.0，而VS降低了53–67％，这是沼气产量最大的稳定范围。就半连续厌氧消化法（AD）而言，除50％外：从第1天到第14天，沼气产量稳步增长的比例为50％，而在90％：10％的第1天和第3天之间，沼气产量最初从180.1降至171.3 mL，在第14天达到最大184 mL。第二天，沼气产量从198.8 mL降至187.5 mL，然后在75％：25％的情况下增加至198.8±0.5 mL，在p＜0.05。因此，该研究可以证实50％：50％的比率（PNPW：ADRW）是在嗜热性AD下处理基于粗脂肪的废物的合适选择，因为它具有快速启动和完全降解活性生物质的潜力。 21天期限。前提是，如果将残留的甲烷（作为温室气体）进行处理，则在废水中将是无效的。