*Anaerobic Co-Digestion of Microalgae and Industrial Wastes: A Critical and Bibliometric Review DOI: http://dx.doi.org/10.5772/intechopen.104378*

production when the OLR is below 1.5 g COD L−1 d−1. HRT was around 30 days, with some studies reporting 90 days when the OLR is around 4 g COD L−1 d−1. OLR and HRT had been discussed as key factors for a complete energy-effective harnessing of microalgae AcoD, to this sense, high OLR and low HRT would be the most effective way for achieving this. However, pH decreases due to VFA accumulation, and ammonium release are the main factors affecting the OLR.
