In this study, precision separation processes were developed for recovering value-added resources, such as organic substances (e.g., humin, humic acid and fulvic acid), nutrients (e.g., nitrate and phosphate) and inorganic ions (e.g., sulfate) from wastewater. Different types of wastewaters, such as piggery wastewater, hot spring discharges and other organic wastewater, were evaluated. The effect of different operating factors, such as dosages of key materials or chemicals, reaction times, and flowrates, on the performance of resource recovery was evalauted. The reaction kinetic and mass transfer models for the developed processes were also established to elucidate the reaction mechanisms and obtain the key design parameters for scale-up. In addition, a preliminary economic analysis was conducted by considering the costs and revenue gains from the processes. This study revealed that the developed precision processes exhibited a promising potential, in terms of technical feasibility and economic viability, in separating valuable resources from wastewater as new products.

Performance evaluation of precision separation processes for recovery of value-added resources from agricultural wastewater

ACS Fall 2021

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