Fish wastes and vegetable market wastes generated along with other wastes in the urban cities are disposed of in open landfill sites and lead to water, air and soil pollution. It occupies more and more land area for disposal as the generation of waste also increases day by day. In this current study, a novel approach has been identified to recover energy from mixed fish waste (MFW) and vegetable market waste (VMW) by anaerobic co-digestion. In fish waste, more than 75% of the total solids contribute to volatile solids, indicating that waste content is organic and suitable for anaerobic digestion. Further, MFW showed that the protein content is 4 to 5 times higher than carbohydrate content, indicating nitrogen richness will inhibit the AD process. Hence, co-digestion of MFW with carbon-rich VMW to maintain the stability of AD has been carried out. In this batch study, the biogas potential of these organic nitrogen-rich wastes was evaluated for major fish species (Parastromateus niger, Sillago indica and Scomberomorus cavalla) and mixed fish wastes individually and co-digestion of MFW with vegetable market waste (VMW) in different ratios. Based on the results, the specific biogas yields from Parastromateus niger, Sillago indica, Scomberomorus cavalla and mixed fish waste were 0.301 ± 0.011, 0.291 ± 0.002, 0.306 ± 0.008 and 0.289 ± 0.013 L/g of VS added, respectively. The co-digestion of fish waste with vegetable market waste in different mixing ratio (1:1 to 1:5) showed specific biogas yields of 0.445 ± 0.02 (1:1), 0.462 ± 0.01 (1:2), 0.489 ± 0.013 (1:3), 0.454 ± 0.015 (1:4) and 0.432 ± 0.011 (1:5) L/g of VS added. The results showed that there is an increase in biogas production during the co-digestion process confirming the synergistic potential of fish waste and vegetable market as substrates for the anaerobic digestion process. Further, the cumulative biogas production data were modelled using first-order kinetic, modified Gompertz and logistics models. The model results showed that the logistics model fitted well with experimental data (R² of 0.99) and the predicted values from this model were less than 1% deviation from experimental biogas production. The results confirmed the suitability of anaerobic digestion for co-digestion of MFW and VMW for enhanced energy recovery for future implementation in an urban area to reduce the waste dumped in landfills.

城市城市产生的鱼类废物和蔬菜市场废物与其他废物一起被丢弃在露天垃圾填埋场，并导致水、空气和土壤污染。随着废物的产生也日益增加，它占据了越来越多的土地用于处置。在目前的这项研究中，已经确定了一种通过厌氧共消化从混合鱼类废物 (MFW) 和蔬菜市场废物 (VMW) 中回收能量的新方法。在鱼类废物中，超过 75% 的总固体成分是挥发性固体，表明废物成分是有机的，适合厌氧消化。此外，MFW 表明蛋白质含量比碳水化合物含量高 4 到 5 倍，表明富含氮会抑制 AD 过程。因此，已经进行了MFW与富含碳的VMW的共同消化以维持AD的稳定性。Parastromateus niger、Sillago indica 和 Scomberomorus cavalla ) 和混合鱼类废物单独和不同比例的 MFW 与蔬菜市场废物 (VMW) 共同消化。根据这些结果，从Parastromateus niger、Sillago indica、Scomberomorus cavalla的比沼气产量VS 的添加量分别为 0.301 ± 0.011、0.291 ± 0.002、0.306 ± 0.008 和 0.289 ± 0.013 L/g。鱼粪与菜市粪以不同混合比（1:1 至 1:5）共消化显示比沼气产量分别为 0.445 ± 0.02 (1:1)、0.462 ± 0.01 (1:2)、0.489 ± 0.013 (1:3)、0.454 ± 0.015 (1:4) 和 0.432 ± 0.011 (1:5) L/g 添加的 VS。结果表明，在共消化过程中沼气产量增加，证实了鱼粪和蔬菜市场作为厌氧消化过程底物的协同潜力。此外，累积沼气生产数据使用一阶动力学、改进的 Gompertz 和物流模型进行建模。模型结果表明，物流模型与实验数据拟合良好（R ²0.99），并且该模型的预测值与实验沼气产量的偏差小于 1%。结果证实了厌氧消化适用于 MFW 和 VMW 的共同消化，以增强能量回收，以便在城市地区未来实施，以减少倾倒在垃圾填埋场的废物。