**8. Conclusions**

The status and current trends of AcoD of microalgae and industrial wastes were reviewed in this chapter. AcoD performance improvements still need further research on varied co-substrates and optimal mix ratios. Operational parameters and their control are key to achieving optimal biogas. Pretreatments of microalgae biomass are a promising way to enhance biogas production. The majority of research investigations are done by a few research groups and centered on biomethane potential tests lacking a common methodology, thus, further research and the application of common criteria need to be implemented. Moreover, pilot-scale assays have shown promising results, however, very few research groups have the ability to implement these studies.
