Cultivation of marine microalgae using shale gas flowback water and anaerobic digestion effluent as the cultivation medium.

•Flowback water and AD effluent were examined as potential water and nutrient sources.•N. salina and D. tertiolecta grew well in the flowback water and AD effluent.•The highest average biomass productivity was obtained with 6% AD effluent.•Algae growth in effluent and flowback water was comparable to commercial nutrients.•Fatty acid profiles using flowback water and effluent were comparable to commercial equivalents.