I Congreso de Postgrado fcfm: ingeniería, ciencias e innovación

190 Santiago, 10 al 12 de agosto, 2022 MEMBRANE TECHNOLOGY FOR WASTE-TO-BIOH2: PROCESS MODELING AND SUSTAINABILITY Gino Vera 1* , Macarena Escudero 1,2, Ana Prieto 1,2 ¹Departamento de Ingeniería Civil, Universidad de Chile, Santiago, Chile. ²Centro Avanzado para Tecnologías del Agua (CAPTA), Santiago, Chile. *Email: ginovera@ug.uchile.cl ABSTRACT Hydrogen has been considered an alternative energy source to fossil fuels. Its production methods, however, determine its sustainability. Globally, the production of green hydrogen is the result of the electrolysis of water, which requires high-quality water obtained from energy-intensive processes such as reverse osmosis (RO), and electrodeionization (EDU) [1]. Alternative and more sustainable methods to obtain hydrogen can improve the efficiency of its production and add value to discarded waste streams. By using microbial processes (e.g., dark fermentation) biohydrogen (BioH 2 ) can be recovered from non-competing feedstocks such as food processing wastewater (e.g., winery and sugar beet). Different waste-to-bioH 2 technologies have evolved in the past years, nevertheless, technical consideration such as microbial competition, the need of stringent pH control, and bio- mass washout limit their deployment [2-3]. Anaerobic membrane bioreactors (AnMBR) require lower hydraulic retention times (HRTs) than conventional systems (e.g., CSTR and UASB), enhance biomass retention, achieve higher COD removal, and enhance biogas production [2]. In this study, a mechanistic model was developed for predicting the production of hydrogen in an anerobic mem- brane bioreactor treating high strength multi-substrate wastewater (COD>1000 mg/L). The model integrates the ADM1 model with physical and biochemical processes such as membrane fouling. Mass balances of 27 vari- ables were computed in transient state, where metabolites, extracellular polymeric substances, soluble microbial products, and surface membrane density were included. Simulations suggest that chemical oxygen demand in the inf luent is a key operating parameter for the system performance. Hydrogen production was increased with increase in temperature, hydraulic retention time (HRT), solid retention time (SRT), and inlet concentration of microorganisms. Hydrogen productivity in the model was between 0.3 – 3.8 LH 2 /L-d, in a range of 1 to 20 mg/L of organic load, which is similar to reported operating systems. ACKNOWLEDGEMENTS This research received financial support from the Chilean National Commission of Science and Technology through the projects ANID/FONDECYT/11191123 REFERENCES [1] K. Solon, E. I. P. Volcke, M. Spérandio, and M. C. M. Van Loosdrecht, “Resource recovery and wastewater treat- ment modelling,” Environ. Sci. Water Res. Technol., vol. 5, no. 4, pp. 631–642, 2019. [2] A. L. Prieto, L. H. Sigtermans, B. R. Mutlu, A. Aksan, W. A. Arnold, and P. J. Novak, “Performance of a composite bioactive membrane for H2 production and capture from high strength wastewater,” Environ. Sci. Water Res. Technol., vol. 2, no. 5, pp. 848–857, 2016. [3] C. Shin et al., “Recovery of Clean Water and Ammonia from Domestic Wastewater: Impacts on Embodied Ener- gy and Greenhouse Gas Emissions,” Environ. Sci. Technol., 2022. R E CU R SOS H Í D R I COS 16