Energetic and economic assessment of sludge thermal hydrolysis in novel wastewater treatment plant configurations
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Título: | Energetic and economic assessment of sludge thermal hydrolysis in novel wastewater treatment plant configurations |
Autor/a: | Taboada Santos, Antón Lema Rodicio, Juan Manuel Carballa Arcos, Marta |
Centro/Departamento: | Universidade de Santiago de Compostela. Departamento de Enxeñaría Química |
Palabras chave: | Anaerobic digestion | Economy of scale | Energy autarky | High-rate activated sludge | Payback time | Sludge disposal | |
Data: | 2019-06-01 |
Editor: | Elsevier |
Cita bibliográfica: | Taboada-Santos, A., Lema, J., & Carballa, M. (2019). Energetic and economic assessment of sludge thermal hydrolysis in novel wastewater treatment plant configurations Waste Management, 92 30- 38. doi: https://doi.org/10.1016/j.wasman.2019.05.003 |
Resumo: | Novel wastewater treatment plants (WWTPs) are aimed to be more energetically efficient than conventional ones. Their first step is a chemical oxygen demand (COD) preconcentration stage with different alternatives, such as rotating belt filters (RBF), chemically enhanced primary treatment (CEPT), high-rate activated sludge (HRAS), or combinations thereof, in which energy requirements are substantially reduced. The COD recovered as sludge allows a noticeable increase of biogas production in anaerobic digestion (AD). In conventional WWTPs, sludge anaerobic biodegradability can be significantly enhanced by applying sludge pretreatment methods, such as thermal hydrolysis (TH), before AD. However, considering that novel-sludges are more anaerobically biodegradable than conventional ones, the impact of TH on their methane production is expected to result significantly lower. In this study, an energetic and economic assessment of applying TH in novel WWTPs was performed. We found that TH is only justified to reduce operational costs as long as sludge TS concentration in the feeding to the TH unit is higher than 1-2%. The HRAS is the scenario that leads to the lowest treatment costs (below 1 c€/m3 wastewater if sludge is thickened over 10% of TS). However, the WWTP based on CEPT for COD preconcentration leads to the lowest electricity consumption (below 0.01 kWh/m3 of wastewater), but even in the most favourable conditions the energy autarky was not achievable. Results show that the main impact of TH is mainly due to sludge disposal savings (270,000-430,000 €/year for a 500,000 inhabitants WWTP) rather than the increase of energy production (achieves maximum savings of 35,000-60,000 €/year). Payback time is very dependent on the WWTP size, ranging from 15 to 30 years for a 100,000 inhabitants WWTP and from 2 to 4 years for a 1,000,000 inhabitants WWTP |
Versión do editor: | https://doi.org/10.1016/j.wasman.2019.05.003 |
URI: | http://hdl.handle.net/10347/18792 |
DOI: | 10.1016/j.wasman.2019.05.003 |
ISSN: | 0956-053X |
Dereitos: | © Elsevier 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license (https://creativecommons.org/licenses/by-nc-nd/4.0/) |
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