Development of an in-line process viscometer for the full-scale biogas process

Mönch-Tegeder, Matthias; Lemmer, Andreas; Hinrichs, Jörg; Oechsner, Hans

doi:10.1016/j.biortech.2014.08.041

Cited by 22 publications

(16 citation statements)

References 31 publications

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“…Previous research on the rheology, including viscosity, of anaerobic digester sludge has mainly focused on plants digesting sewage sludge. Yet, there are some publications reporting that substrate composition, other than sewage sludge, affects the reactor sludge viscosity (e.g., Björn et al 2012;Nges et al 2012;Mönch-Tegeder et al 2015). Furthermore, Björn et al (2012) demonstrated that similar total solid (TS) values do not necessarily correspond to similar viscosity values when different substrates, other than sewage sludge, were anaerobically digested in laboratory-scale reactors.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, Björn et al (2012) demonstrated that similar total solid (TS) values do not necessarily correspond to similar viscosity values when different substrates, other than sewage sludge, were anaerobically digested in laboratory-scale reactors. Mönch-Tegeder et al (2015) showed a large impact of the type of substrate, the TS content, and the mechanical disintegration of the substrate on the viscosity in a manure-based full-scale biogas process. However, information on the effects of OFMSW co-digestion with sewage sludge on rheological properties of the slurry in anaerobic digesters at WWTPs is scarce.…”

Section: Introductionmentioning

confidence: 99%

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Feasibility of OFMSW co-digestion with sewage sludge for increasing biogas production at wastewater treatment plants

Björn

Yekta

Ziels

et al. 2017

Euro-Mediterr J Environ Integr

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Sweden has the ambition to increase its annual biogas production from the current level of 1.9 to 15 TWh by 2030. The unused capacity of existing anaerobic digesters at wastewater treatment plants is among the options to accomplish this goal. This study investigated the feasibility of utilizing the organic fraction of municipal solid waste (OFMSW) as a co-substrate, with primary and waste-activated sewage sludge (PWASS) for production of biogas, corresponding to 3:1 ratio on volatile solid (VS) basis. The results demonstrated that co-digestion of OFMSW with PWASS at an organic loading rate of 5 gVS l −1 day −1 has the potential to increase the biogas production approximately four times. The daily biogas production increased from 1.0 ± 0.1 to 3.8 ± 0.3 l biogas l −1 day −1 , corresponding to a specific methane production of 420 ± 30 Nml methane gVS −1 during the laboratory experiment. Co-digestion of OFMSW with PWASS showed a 50:50 distribution of hydrogenotrophic and aceticlastic methanogens in the digester and enhanced the turnover kinetics of intermediate products (acetate, propionate, and oleate). Practical limitations potentially include the need for sludge dewatering to maintain a sufficient hydraulic retention time (17 days in this study), as well as additional energy consumption for mixing due to an increased sludge apparent viscosity (from 1.8 ± 0.1 to 45 ± 4.8 mPa*s in this study) at elevated OFMSW-loading rates.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Feasibility of OFMSW co-digestion with sewage sludge for increasing biogas production at wastewater treatment plants

Björn

Yekta

Ziels

et al. 2017

Euro-Mediterr J Environ Integr

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“…Zur Charakterisierung von Fermentersuspensionen gibt es viele Untersuchungen, deren Ergebnisse die stark unterschiedlichen viskosen und scherverdünnenden Fluideigenschaften aufzeigen , . All diese Untersuchungen verwenden für mittlere Scherraten das Gesetz nach Ostwald‐de‐Waele , .…”

Section: Materials Und Methodenunclassified

Einfluss der Rührwerksposition auf den Mischprozess in Biogasanlagen anhand eines Paddelrührwerks

Annas

Elfering

Volbert

et al. 2019

Chemie Ingenieur Technik

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Die Auslegung und Optimierung von Rührsystemen in Biogasanlagen erfolgt nach wie vor auf Basis empirischer Erfahrungswerte. Mithilfe der particle image velocimetry (PIV) wurde das Strömungsfeld eines Paddelrührwerks unter dem Einfluss der Einbaulage und der Fluidviskosität im Labormaßstab untersucht. Dabei wurden die Viskositätseigenschaften von Fermentersuspensionen mithilfe eines Rohrviskosimeters bestimmt. Über Maßstabsgesetze konnten die Viskositätseigenschaften der Modellsuspensionen für den Versuch angepasst werden. Als Ergebnis zeigt sich, dass eine geänderte Einbaulage Totzonen um bis zu 55 % reduzieren kann.

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“…Ten horizontal cylindrical digesters (diameter = 200 mm, length = 685 mm) made of stainless steel and with a volume of 20 L (working volume 16 L) each were operated as continuous stirred tank reactor (CSTR) according to VDI guideline 4630 [34] as illustrated in Fig. Initially all digesters were filled with 16 L of inoculum obtained from a fullscale, maize and grass silages based biogas research plant at the University of Hohenheim [36] and run for two weeks without feeding substrate to degas and adapt microorganisms with the environment. Substrate was fed into one side of the digester and the digestate was pushed out at the opposite side.…”

Section: Anaerobic Digestion Trialsmentioning

confidence: 99%

“…The internal temperature of the digester was measured with an automatic computer-interfaced system. Initially all digesters were filled with 16 L of inoculum obtained from a fullscale, maize and grass silages based biogas research plant at the University of Hohenheim [36] and run for two weeks without feeding substrate to degas and adapt microorganisms with the environment.…”

Section: Anaerobic Digestion Trialsmentioning

confidence: 99%

Increasing the loading rate of continuous stirred tank reactor for coffee husk and pulp: Effect of trace elements supplement

Chala

Oechsner

Fritz³

et al. 2018

Engineering in Life Sciences

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In this study, the anaerobic performance and stability of coffee husk and pulp with and without trace element (TE) supplement was investigated, using 20 L mesophilic continuous stirred tank reactors for 140 days of experiment (DOE). The TE was cocktail of trace metals composed of Fe, Ni, Zn, Co, Mn, Mo, Se W and B. The organic loading rate (OLR) was increased stepwise from 2.5 (HRT = 40 d) to 6.0 kg VS m−3 d− 1(HRT = 16.7 d). The highest methane productivity from pulp with and without TE was 1.272 and 0.965 m3 m−3 d−1 at an OLR of 6.0 and 5.0 kg VS m−3 d−1; while the husks performed 0.895 and 0.795 m3 m−3 d−1 respectively, both at an OLR of 6.0 kg VS m−3 d−1. The specific methane yield (SMY) of pulp (at OLR = 5 kg VS m−3 d−1) with and without TEs was 217.9 ± 4.7 and 193.1 ± 8.2 L kg−1 VS; while husk yielded 149.2 ± 6.0 and 132.5 ± 4.9 L kg−1 VS, respectively. The effect of TEs on SMY was statistically significant (p < 001) at higher OLRs (5.0 ‐ 6.0 kg VS m−3 d−1). The TEs improved the anaerobic stability through an optimum alkalinity ratio (VFA/TIC < 0.3) and suppressed the accumulation of volatile fatty acids. Mono digestion of husks and pulp are prone to lack Mo, Zn, Ni and Fe in long‐term anaerobic fermentation. Further studies on co‐digestion of husk/pulp with animal manure and dry fermentation helps to efficiently use this biomass resource.

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Development of an in-line process viscometer for the full-scale biogas process

Cited by 22 publications

References 31 publications

Feasibility of OFMSW co-digestion with sewage sludge for increasing biogas production at wastewater treatment plants

Feasibility of OFMSW co-digestion with sewage sludge for increasing biogas production at wastewater treatment plants

Einfluss der Rührwerksposition auf den Mischprozess in Biogasanlagen anhand eines Paddelrührwerks

Increasing the loading rate of continuous stirred tank reactor for coffee husk and pulp: Effect of trace elements supplement

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