As water resource recovery facilities (WRRFs) implement biological nutrient removal (BNR) processes to remove excess wastewater nutrients, carboxylic acid demands increase; resource recovery processes (e.g., struvite, polyhydroxyalkanoate production) also demand carboxylates. In this regard, interest in algae to achieve tertiary treatment creates a new intraWRRF fermentation substrate. Indeed, fermentation potential tests indicated that algal augmentation could prove beneficial; carboxylate concentrations increased 31 % over primary solids. However, unexpectedly, and disproving a key research hypothesis, algal augmentation in a fed-batch fermenter decreased the production of carboxylic acids (26-34% at SRTs of 5-7 d); preliminary analyses suggest heterotrophic algae consumed carboxylates. Disproving a second research hypothesis, algal biomass did not significantly diversify carboxylate speciation. Finally, and unexpectedly, algal fermentation realized significant ammonia removal (39-96 % at SRTs of 5-7 d). Although decreased carboxylate yield is not desired, reduced ammonia load could potentially decrease WRRF energy demands and decrease carboxylic acid demands to achieve denitrification. Water Environ. Res., 90, 1997 (2018).