High-solids anaerobic co-digestion of seven kinds of waste biomass mainly consisting of dewatered sludge produced in an oxidation-ditch process and waste fried Tofu.

Togari, Taketo; Yamamoto-Ikemoto, Ryoko; Gu, Tingting; Ono, Hiroshi; Hidaka, Taira; Tsumori, Jun; Yanai, Atsushi; Kinoshita, Hiroshige; Shimizu, Hiroyuki

doi:10.2208/jscejer.70.iii_425

Cited by 2 publications

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“…The biogas production was increased by 12% through the pretreatment of OD sludge. Assuming that the biogas yield of each waste biomass (except the OD sludge) is the same as that of the biogas production potential reported by Togari et al [11], we estimated that the biogas yield of the OD sludge was increased by 42% through the microwave irradiation shown in Table 5.…”

Section: Pilot-scale Continuous Experimentsmentioning

confidence: 99%

Effects of Microwave Pretreatment of Dewatered Sludge from an Oxidation-Ditch Process on the Biogas Yield in Mesophilic Anaerobic Digestion

Togari

Yamamoto-Ikemoto

Ono

et al. 2016

J. of Wat. & Envir. Tech.

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Microwave pretreatment was applied to highly concentrated dewatered sludge produced from an oxidation ditch process (OD sludge) to improve its degradation and biogas production in mesophilic anaerobic digestion. In a batch experiment using methane fermentation, the biogas production potential of OD sludge was increased after microwave irradiation. The increase in the biogas potential depended on the irradiation period and the temperature. Continuous digestion of the pretreated OD sludge was carried out in mesophilic conditions using a laboratory-scale digester at 25 days of hydraulic retention time (HRT). Although the biogas yield in the control digester was 0.12 NL/g-total solids (TS), that fed with OD sludge pretreated with max 100 W of irradiation at 80°C for 60 min was 0.15 NL/g-TS. Subsequently, dewatered OD sludge was pretreated by a novel continuous microwave irradiation device at 400 W for 20 min and fed into a pilot-scale co-digester with six kinds of waste biomass. The biogas yield of the reactor was increased from 0.25 NL/g-TS to 0.28 NL/g-TS. Assuming that the biogas yield of each co-digesting biomass was constant, the biogas yield of the OD sludge was estimated to increase by 42%.

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Section: Pilot-scale Continuous Experimentsmentioning

confidence: 99%