Optimization of Energy Recovery from Cellulosic Wastewater Using Mesophilic Single-Stage Bioreactor
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ORIGINAL PAPER
Optimization of Energy Recovery from Cellulosic Wastewater Using Mesophilic Single‑Stage Bioreactor Samir Ibrahim Gadow1 · Yu‑You Li2 Received: 4 May 2019 / Accepted: 25 September 2019 © Springer Nature B.V. 2019
Abstract The efficiency of single-stage biohythane production from synthetic cellulosic wastewater under mesophilic temperature was investigated. A lab-scale continuously stirred tank reactor was conducted at a hydraulic retention time of 10 days using mixed microflora without pretreatment. The experimental results show that a stable methane and hydrogen yields of 18.2 ± 0.16 and 5.6 ± 0.31 L/kg VS were maintained for 240 days, respectively with acetate/butyrate ratio of 0.39 as the main byproducts. Based on COD mass balance, more than 45% of the decomposed COD converted to bio-hythane, which means that the setting temperature 37 °C and pH improved the conditions of degradation efficiency. The energy recovery calculations indicated that the total net energy was 4.54 MJ/m3 of cellulosic wastewater. This work contributes to the limited knowledge on continuous cellulosic-hythane conversion into a safe and clean form of energy. Graphic Abstract
Keywords Bio-hythane · Fermentation · Cellulosic wastewater · CSTR · Mesophilic temperature
* Samir Ibrahim Gadow [email protected] Yu‑You Li [email protected] 1
Agriculture and Biology Research Division, Department of Agricultural Microbiology, National Research Centre, 33 EI Buhouth St., Dokki, Cairo 12622, Egypt
Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6‑6‑06 Aza‑Aoba, Aramaki, Aoba‑ku, Sendai, Miyagi 980‑8579, Japan
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Statement of Novelty Recently, few research works covered the topic of singlestage continuous technology to produce hythane in the literature. Therefore, this work presented an efficient single-stage bioreactor to produce hythane under mesophilic temperature and evaluates the long-term operation. This research remarks also a positive net energy gained from cellulosic wastewater and the temperature and operation conditions were optimal.
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Introduction A large amount of cellulosic wastewater generated from industrial activities such as paper industries which have large organic contamination. The wastewater often has a dark color due to small parts of tree crust and wood, cellulose fibers and dissolved lignin. Therefore, a sustainable environmental solution is needed to treat this kind of wastewater as well as an energy recovery option. The treatment of cellulosic wastewater through an anaerobic process offers numerous focal points, such as the reduction of pollution and prevention of odor release. Consequently, effective conversion technologies are needed to sustain economic growth indefinitely without environmental deterioration [1]. In 2010, the hythane was trademarked for the first time in Eden’s report and it is a mixture of hydrogen and methane [2]. By combining the advantages of hydrogen and methane, hythane is considered
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