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Dairy manure is a valuable by-product of the animal production industry, but it may cause environmental problems due to inappropriate management and utilization. Although Elodea canadensis is an invasive species, it can be used as a renewable energy source for production of some biorefinery products such as biogas. Therefore, the potential use of E. canadensis biomass as a co-substrate for biogas generation was investigated by gradually increasing the amount of E. canadensis in the mixture containing dairy manure. Microalgae collected directly from Lake Eğirdir by hand were first dried and then subjected to grinding. Five different mixtures were prepared for the co-fermentation of E. canadensis with dairy manure. The experiments were carried out in the anaerobic digester unit, which consists of 2-L bottles in a temperature-controlled water bath. The results showed that the specific methane production of …