Energy Recovery Potential in Industrial and Municipal Wastewater Networks Using Micro-Hydropower in Spain

• Main Authors: Aida Mérida García, Juan Antonio Rodríguez Díaz, Jorge García Morillo, Aonghus McNabola
• Format: Article
• Language: English
• Published: MDPI AG 2021-03-01
• Series: Water
• Subjects: wastewater treatment plants; industries; fish farms; renewable energy; hydropower potential
• Online Access: https://www.mdpi.com/2073-4441/13/5/691

The use of micro-hydropower (MHP) for energy recovery in water distribution networks is becoming increasingly widespread. The incorporation of this technology, which offers low-cost solutions, allows for the reduction of greenhouse gas emissions linked to energy consumption. In this work, the MHP energy recovery potential in Spain from all available wastewater discharges, both municipal and private industrial, was assessed, based on discharge licenses. From a total of 16,778 licenses, less than 1% of the sites presented an MHP potential higher than 2 kW, with a total power potential between 3.31 and 3.54 MW. This total was distributed between industry, fish farms and municipal wastewater treatment plants following the proportion 51–54%, 14–13% and 35–33%, respectively. The total energy production estimated reached 29 GWh∙year⁻¹, from which 80% corresponded to sites with power potential over 15 kW. Energy-related industries, not included in previous investigations, amounted to 45% of the total energy potential for Spain, a finding which could greatly influence MHP potential estimates across the world. The estimated energy production represented a potential CO₂ emission savings of around 11 thousand tonnes, with a corresponding reduction between M€ 2.11 and M€ 4.24 in the total energy consumption in the country.