Energy feasibility and life cycle assessment of sludge pretreatment methods for advanced anaerobic digestion.

Autor: Balasundaram G; Department of Civil Engineering, Indian Institute of Technology Roorkee 247667, India., Vidyarthi PK; Department of Hydro and Renewable Energy, Indian Institute of Technology Roorkee 247667, India., Gahlot P; Department of Civil Engineering, Indian Institute of Technology Roorkee 247667, India., Arora P; Department of Hydro and Renewable Energy, Indian Institute of Technology Roorkee 247667, India., Kumar V; School of Water, Energy and Environment, Cranfield University, Cranfield MK43 0AL, UK., Kumar M; Sustainability Cluster, School of Engineering, University of Petroleum & Energy Studies, Dehradun 248007, India., Kazmi AA; Department of Civil Engineering, Indian Institute of Technology Roorkee 247667, India., Tyagi VK; Environmental Hydrology Division, National Institute of Hydrology, Roorkee 247667, India. Electronic address: vinayiitrp@gmail.com.
Jazyk: angličtina
Zdroj: Bioresource technology [Bioresour Technol] 2022 Aug; Vol. 357, pp. 127345. Date of Electronic Publication: 2022 May 21.
DOI: 10.1016/j.biortech.2022.127345
Abstrakt: Energy sustainability is one of the critical parameters to be studied for the successful application of pretreatment processes. This study critically analyzes the energy efficiency of different energy-demanding sludge pretreatment techniques. Conventional thermal pretreatment of sludge (∼5% total solids, TS) produced 244 mL CH 4 /gTS, which could result in a positive energy balance of 2.6 kJ/kg TS. However, microwave pretreatment could generate only 178 mL CH 4 /gTS with a negative energy balance of -15.62 kJ/kg TS. In CAMBI process, the heat requirements can be compensated using exhaust gases and hot water from combined heat and power, and electricity requirements are managed by the use of cogeneration. The study concluded that <100 ℃ pretreatment effectively enhances the efficiency of anaerobic digestion and shows positive energy balance over microwave and ultrasonication. Moreover, microwave pretreatment has the highest global warming potential than thermal and ultrasonic pretreatments.
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Databáze: MEDLINE
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