Thermal hydrolysis pre-treatment combined with anaerobic digestion for energy recovery from organic wastes
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ORIGINAL ARTICLE
Thermal hydrolysis pre‑treatment combined with anaerobic digestion for energy recovery from organic wastes Xiaohui Liu1,2 · Changmin Lee2 · Jae Young Kim2 Received: 29 August 2019 / Accepted: 24 March 2020 © Springer Japan KK, part of Springer Nature 2020
Abstract To investigate the applicability and effectiveness of anaerobic digestion combined with thermal hydrolysis pre-treatment (THP), one pre-treatment condition (170 ℃/10 bar, 30 min) was set to process three different organic wastes (i.e., food waste, swine manure, and sewage sludge) under mesophilic (35 ± 1 ℃) and thermophilic (50 ± 1 ℃) temperatures. The characteristics of raw/pre-treated substrates were analyzed and biochemical methane potential (BMP) tests were performed. Results showed that THP improved organics solubilization as demonstrated by decreased VSS/VS and increased SCOD/TCOD ratios. BMP tests indicated that thermophilic anaerobic digestion (TAD) combined with THP did not significantly promote cumulative methane production (CMP) of food waste and swine manure (p > 0.05). The CMP of pre-treated sewage sludge in mesophilic anaerobic digestion (MAD) condition was higher than those of other digestion conditions. The modified Gompertz model and first-order kinetic model illustrated that THP improved methane production potential, hydrolysis rate as well as methane yield rate of swine manure and sewage sludge except for food waste; TAD had no obvious influence on those parameters. According to net energy estimation, THP enhanced energy production of methane from swine manure and sewage sludge except for food waste; TAD consumed more energy than MAD. The increased energy benefits by THP did not cover its extra energy consumptions in the combination of mesophilic and thermophilic anaerobic digestion in this study. Keywords Thermal hydrolysis pre-treatment · Organic wastes · Anaerobic digestion · Mesophilic temperature · Thermophilic temperature
Introduction Organic wastes such as food waste, swine manure, and sewage sludge have been produced excessively nowadays. As high as one-third of food has been wasted and the amount of discarded food accounts for 1.3 billion tons every year [1]; over a billion tons of livestock manure is produced in the United States [2]. Around 30,000 tons of dry sludge mass has been generated from wastewater treatment plants (WWTPs) in European Union annually [3] and accounts for up to 50% of the operating costs of a WWTP [4]. The odor, emission of greenhouse gases, and groundwater pollution * Jae Young Kim [email protected] 1
Shanxi Institute of Energy, College Street 63, Yuci District, Jinzhong 030600, People’s Republic of China
Department of Civil and Environmental Engineering, Seoul National University, 1 Gwanak‑ro, Gwanak‑gu, Seoul, Republic of Korea
2
seriously threaten the living environment as well as the health of human beings. Anaerobic digestion (AD), which utilizes microorganisms to decompose organic compounds and convert them into renewable energy-methane, has been treated as a suitab
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