Biochemical Methane Potential Tests to Evaluate Anaerobic Digestion Enhancement by Thermal Hydrolysis Pretreatment
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Biochemical Methane Potential Tests to Evaluate Anaerobic Digestion Enhancement by Thermal Hydrolysis Pretreatment Roberta Ferrentino 1
&
Fabio Merzari 1 & Luca Fiori 1 & Gianni Andreottola 1
# Springer Science+Business Media, LLC, part of Springer Nature 2019
Abstract This study evaluates the effects of thermal hydrolysis (TH) pretreatment on anaerobic digestion (AD), through results obtained by biochemical methane potential (BMP) tests under mesophilic conditions (35 °C). Thickened sludge from a wastewater treatment plant (WWTP) was thermally treated under two different temperatures (150 and 170 °C) and reaction times (30 and 60 min). Results show a significant increase in soluble COD, compared with the untreated sludge, when sludge was treated at 170 °C for 60 min. Moreover, the following BMP tests point out that TH pretreatment of sludge accelerated the AD rate and increased the biogas yield contributing to an increase in methane production, ranging between 17 and 24% compared with the raw sludge. Furthermore, the hydrolysis constant was estimated and methane production and degree of disintegration of the TH pretreated sludge were correlated, in order to deep the knowledge on the hydrolysis as the AD rate-limiting step. Further, the combined effects of TH pretreatment and AD on sludge show a reduction of total and volatile solids up to 19% and 24%, respectively. Keywords Thermal hydrolysis pretreatment . Anaerobic digestion . Organic solubilization . BMP . Sludge hydrolysis
Introduction Sewage sludge is the main waste produced by wastewater treatment plants (WWTPs) [1]. In the last century, the amount of this residue has increased due to the high water demand of an increasing population, to industrialization and urbanization, and to the higher level of wastewater treatment [2]. Sludge management, including treatment and disposal, could account up to 65% of the total operational costs of a WWTP [3]. The main sludge disposal options, used over the years, are Electronic supplementary material The online version of this article (https://doi.org/10.1007/s12155-019-10017-6) contains supplementary material, which is available to authorized users. * Roberta Ferrentino [email protected] Fabio Merzari [email protected] Luca Fiori [email protected] Gianni Andreottola [email protected] 1
Department of Civil, Environmental and Mechanical Engineering, University of Trento, via Mesiano 77, 38123 Trento, Italy
incineration, landfilling, and land application. Today, all these strategies are not anymore economically and environmentally sustainable, due to the need for expensive machinery, the use of non-renewable resources, the high space requirement, the stringent regulatory limits, and the high generation of greenhouse gases (GHGs) emissions [2, 4]. Therefore, the development of new sludge management strategies, both costeffective and environmentally sustainable, is a challenging issue, which still requires considerable efforts from the scientific and industrial communities. Among all sludge m
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