Globally, kitchen waste (KW) and sewage sludge (SS) are two important forms of organic wastes that need immense attention during handling and management. As the characteristics and components of KW vary significantly with respect to location and season, it is often difficult to understand the behavior of KW during the (co-)digestion process. Therefore, this study aimed to investigate the synergistic influence of KW over SS and vice versa during anaerobic (co-)digestion. Anaerobic mono-digestion and co-digestion of SS and KW, considering three different mixing ratios SS:KW; (SK1–25:75, SK2–50:50, SK3–75:25), was conducted to investigate their specific methane yields (SMY) and biodegradability (BD). The modified Gompertz equation was used to estimate the theoretical methane potential and used as a reference for experimental data assessment. The results demonstrated that SMYs were 212 and 368 L kg⁻¹ VS_added for SS, and KW, respectively. Under the category of co-digestion, sample SK2 (SS:KW; 50:50) had the highest BD of 91% as compared to digestion of SS (61%) and KW (74.9%) separately. A synergistic effect on methane production was witnessed with all ratios and the maximum was noticed with SK2, ca. 40%, which can be ascribed to the enhanced hydrolysis because of the addition of KW, which is readily degradable by nature. Further, this study could be used as guidelines to the design and optimization of the co-digestion process.

在全球范围内，厨房废物（KW）和污水污泥（SS）是有机废物的两种重要形式，在处理和管理过程中需要引起高度重视。由于KW的特征和组成随位置和季节的不同而有很大差异，因此通常难以理解KW在（共）消化过程中的行为。因此，本研究旨在研究厌氧（共）消化过程中KW对SS的协同影响，反之亦然。考虑到SS：KW的三种不同混合比，SS和KW的厌氧消化和共同消化；（SK1 – 25：75，SK2 – 50：50，SK3 –75:25），以研究其特定的甲烷产量（SMY）和生物降解性（BD）。修改后的Gompertz方程用于估算理论甲烷潜力，并用作实验数据评估的参考。结果表明，分别SMYS 212和368公斤大号^{- 1}  VS_添加分别用于SS和KW。在共消化类别下，与分别消化SS（61％）和KW（74.9％）相比，样品SK2（SS：KW; 50:50）的BD最高，为91％。在所有比例下，均观察到对甲烷产生的协同作用，并且在SK2，ca中观察到最大。40％，这归因于增加的KW，其由于自然易于降解而增加的水解。此外，该研究可以用作共消化过程的设计和优化的指导。