In this work, we present a nutrient recovery process that combines anaerobic digestion and cyanobacteria cultivation. We used process modeling and techno-economic analysis for assessing how changing parameters of the cyanobacteria cultivation and strain design affect key economic metrics such as the cost of recovering the phosphorus in manure, capital and operating costs, and resource use (land, water, and energy). We then use the insights from techno-economic analysis to engineer new strains of Picosynechococcus sp. PCC 7002 (referred to as "7002" hereafter) for use in phosphorus bioaccumulation. The proposed process generates a dense, nutrient-rich biomass that can be used as a biofertilizer, enabling long-distance transportation and potentially facilitating the transition to a more circular agricultural economy.