High-solids anaerobic digestion of cassava pulp in semi-continuous bioreactors

The effects of two total solids contents (TS) and two inocula were studied for the semi-continuous high-solids anaerobic digestion (HS-AD) of cassava pulp under mesophilic conditions (35 ± 2 °C). In the 1.0-L bioreactors, two TS of 15% and 20% with digestate as a sole inoculum were chosen to run the HS-AD, and two inocula (the digestate from the AD of cassava pulp and sewage sludge) were used separately under TS 20%. All treatments were carried out at the organic matter loading rates (OLRs) of from 3.0 to 10.0 kg volatile solids (VS)/(m3·d), with each phase of 6 days followed by two 3-days phases of no feeding and then low OLR of 6.5 kg VS/(m3·d). Compared with TS 15%, the bioreactors of TS 20% with the digestate had a higher buffering capability to alleviate the rapid acidification and a higher level of the specific methane yields (SMYs) of from 0.212 to 0.233 m3/(kgVSadded) at the OLRs of 4.0 to 6.5 kgVS/(m3·d), while TS 15% obtained the highest SMY of from 0.152 to 0.182 m3/(kgVSadded) at the OLR of 4.0, 6.5, and 8.0 kgVS/(m3·d). In contrast, sewage sludge did not restrain the rapid acidification and only yielded quite small SMYs under TS 20%.

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Sludge minimization by disintegration at different wastewater treatment plants

Water Practice & Technology ◽

10.2166/wpt.2008.010 ◽

2008 ◽

Vol 3 (1) ◽

Author(s):

Luchien Luning ◽

Paul Roeleveld ◽

Victor W.M. Claessen

Keyword(s):

Organic Matter ◽

Wastewater Treatment ◽

Anaerobic Digestion ◽

Sewage Sludge ◽

New Technologies ◽

Wastewater Treatment Plants ◽

Treatment Plant ◽

Biological Degradation ◽

Ongoing Research ◽

Sludge Minimization

In recent years new technologies have been developed to improve the biological degradation of sewage sludge by anaerobic digestion. The paper describes the results of a demonstration of ultrasonic disintegration on the Dutch Wastewater Treatment Plant (WWTP) Land van Cuijk. The effect on the degradation of organic matter is presented, together with the effect on the dewatering characteristics. Recommendations are presented for establishing research conditions in which the effect of sludge disintegration can be determined in a more direct way that is less sensitive to changing conditions in the operation of the WWTP. These recommendations have been implemented in the ongoing research in the Netherlands supported by the National Institute for wastewater research (STOWA).

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HIGH-SOLIDS ANAEROBIC DIGESTION OF SEWAGE SLUDGE —EFFECTS OF PRETREATMENT OF WASTE ACTIVATED SLUDGE

Journal of Japan Society of Civil Engineers Ser G (Environmental Research) ◽

10.2208/jscejer.74.iii_187 ◽

2018 ◽

Vol 74 (7) ◽

pp. III_187-III_194 ◽

Cited By ~ 1

Author(s):

Masanobu TAKASHIMA ◽

Nobuichi NAKAO

Keyword(s):

Anaerobic Digestion ◽

Sewage Sludge ◽

Activated Sludge ◽

Waste Activated Sludge ◽

High Solids

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Batch and Semi-Continuous Anaerobic Digestion of Industrial Solid Citrus Waste for the Production of Bioenergy

Processes ◽

10.3390/pr9040648 ◽

2021 ◽

Vol 9 (4) ◽

pp. 648

Author(s):

Erik Samuel Rosas-Mendoza ◽

Andrea Alvarado-Vallejo ◽

Norma Alejandra Vallejo-Cantú ◽

Raúl Snell-Castro ◽

Sergio Martínez-Hernández ◽

...

Keyword(s):

Anaerobic Digestion ◽

Oxygen Demand ◽

Continuous Mode ◽

Citrus Industry ◽

Batch Mode ◽

Volatile Solids ◽

Working Volume ◽

Plant Level ◽

Citrus Waste ◽

Mesophilic Conditions

The aim of this paper is to describe a study of the anaerobic digestion of industrial citrus solid waste (ISCW) in both batch and semi-continuous modes for the production of bioenergy without the elimination of D-limonene. The study was conducted at the pilot plant level in an anaerobic reactor with a working volume of 220 L under mesophilic conditions of 35 ± 2 °C. Cattle manure (CM) was used as the inoculum. Three batches were studied. The first batch had a CM/ISCW ratio of 90/10, and Batches 2 and 3 had CM/ISCW ratios of 80/20 and 70/30, respectively. In the semi-continuous mode an OLR of approximately 8 g total chemical oxygen demand (COD)/Ld (4.43 gVS/Ld) was used. The results showed that 49%, 44%, and 60% of volatile solids were removed in the batch mode, and 35% was removed in the semi-continuous mode. In the batch mode, 0.322, 0.382, and 0.316 LCH4 were obtained at STP/gVSremoved. A total of 24.4 L/d (34% methane) was measured in the semi-continuous mode. Bioenergy potentials of 3.97, 5.66, and 8.79 kWh were obtained for the respective batches, and 0.09 kWh was calculated in the semi-continuous mode. The citrus industry could produce 37 GWh per season. A ton of processed oranges has a bioenergy potential of 162 kWh, which is equivalent to 49 kWh of available electricity ($3.90).

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Dry anaerobic digestion of high solids content dairy manure at high organic loading rates in psychrophilic sequence batch reactor

Applied Microbiology and Biotechnology ◽

10.1007/s00253-015-6516-2 ◽

2015 ◽

Vol 99 (10) ◽

pp. 4521-4529 ◽

Cited By ~ 7

Author(s):

Daniel I. Massé ◽

Noori M. Cata Saady

Keyword(s):

Anaerobic Digestion ◽

Batch Reactor ◽

Dairy Manure ◽

High Solids ◽

Organic Loading ◽

Loading Rates ◽

Sequence Batch Reactor ◽

Solids Content ◽

High Solids Content ◽

Dry Anaerobic Digestion

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Development of an Optimised Chinese Dome Digester Enables Smaller Reactor Volumes; Pilot Scale Performance

Energies ◽

10.3390/en12112213 ◽

2019 ◽

Vol 12 (11) ◽

pp. 2213 ◽

Cited By ~ 2

Author(s):

Abiodun O. Jegede ◽

Grietje Zeeman ◽

Harry Bruning

Keyword(s):

Fatty Acids ◽

Ambient Temperature ◽

Methane Production ◽

Volatile Fatty Acids ◽

Pilot Scale ◽

High Loading ◽

Treatment Efficiency ◽

Total Solids ◽

Loading Rates ◽

Volatile Solids

Chinese dome digesters are usually operated at long hydraulic retention times (HRT) and low influent total solids (TS) concentration because of limited mixing. In this study, a newly optimised Chinese dome digester with a self-agitating mechanism was investigated at a pilot scale (digester volume = 500 L) and compared with a conventional Chinese dome digester (as blank) at 15% influent TS concentration at two retention times (30 and 40 days). The reactors were operated at ambient temperature: 27–33 °C. The average specific methane production, volatile fatty acids and percentage of volatile solids (VS) reduction are 0.16 ± 0.13 and 0.25 ± 0.05L CH4/g VS; 1 ± 0.5 and 0.7 ± 0.3 g/L; and 51 ± 14 and 57 ± 10% at 40 days HRT (day 52–136) for the blank and optimised digester, respectively. At 30 days HRT (day 137–309) the results are 0.19 ± 0.12 and 0.23 ± 0.04 L CH4/g VS; 1.2 ± 0.6 and 0.7 ± 0.3 g/L; and 51 ± 9 and 58 ± 11.6%. Overall, the optimised digester produced 40% more methane than the blank, despite the high loading rates applied. The optimised digester showed superior digestion treatment efficiency and was more stable in terms of VFA concentration than the blank digester, can be therefore operated at high influent TS (15%) concentration.

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High-solids anaerobic digestion: comparison of three pilot scales

Water Science & Technology ◽

10.2166/wst.2008.521 ◽

2008 ◽

Vol 58 (9) ◽

pp. 1757-1763 ◽

Cited By ~ 60

Author(s):

J. Guendouz ◽

P. Buffière ◽

J. Cacho ◽

M. Carrère ◽

J.-P. Delgenes

Keyword(s):

Anaerobic Digestion ◽

Municipal Solid Waste ◽

Solid Waste ◽

Methane Production ◽

Operating Conditions ◽

High Solids ◽

Dry Digestion ◽

Mesophilic Conditions ◽

Production Efficiencies

Two experiments were undertaken in three different experimental set-ups in order to compare them: an industrial 21-m3 pilot reactor, a new 40-ℓ laboratory pilot reactor and bmp type plasma bottles. Three consecutive batch dry digestion tests of municipal solid waste were performed under mesophilic conditions with the same feedstock in all vessels. Biogas and methane production at the end of the tests were similar (around 200 m3 CH4STP/tVS) for both pilot reactors and were different from the bottle tests. The dynamics of methane production and VFA accumulation concurred. However, the maximal levels of VFA transitory accumulation varied between reactors and between runs in a same reactor. Ammonia levels were similar in both reactors. These results show that the new reactor accurately imitates the conditions found in the larger one. Adaptation of microorganisms to the waste and operating conditions was also pointed out along the consecutive batches. Thermophilic semi-continuous tests were performed in both reactors with similar conditions. The methane production efficiencies were similar.

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Treatment of dairy waste by anaerobic co-digestion with sewage sludge

Ecological Chemistry and Engineering S ◽

10.1515/eces-2016-0007 ◽

2016 ◽

Vol 23 (1) ◽

pp. 99-115 ◽

Cited By ~ 5

Author(s):

Agnieszka A. Pilarska ◽

Krzysztof Pilarski ◽

Kamil Witaszek ◽

Hanna Waliszewska ◽

Magdalena Zborowska ◽

...

Keyword(s):

Lactic Acid ◽

Anaerobic Digestion ◽

Sewage Sludge ◽

Organic Carbon ◽

Organic Waste ◽

Cheese Whey ◽

Oxygen Demand ◽

Volatile Solids ◽

Biomethane Production ◽

Digested Sewage Sludge

Abstract The results of anaerobic digestion (AD) of buttermilk (BM) and cheese whey (CW) with a digested sewage sludge as inoculum is described. The substrate/inoculum mixtures were prepared using 10% buttermilk and 15% cheese whey. The essential parameters of the materials were described, including: total solids (TS), volatile solids (VS), pH, conductivity, C/N ratio (the quantitative ratio of organic carbon (C) to nitrogen (N)), alkalinity, chemical oxygen demand (COD). The potential directions of biodegradation of the organic waste types, as used in this study, are also presented. Appropriate chemical reactions illustrate the substrates and products in each phase of anaerobic decomposition of the compounds that are present in buttermilk and cheese whey: lactic acid, lactose, fat, and casein. Moreover, the biogas and biomethane production rates are compared for the substrates used in the experiment. The results have shown that buttermilk in AD generates more biogas (743 m3/Mg VS), including methane (527 m3/Mg VS), when compared with cheese whey (600 m3/Mg VS, 338 m3/Mg VS for biogas and methane, respectively).

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Anaerobic digestion of mixed microalgae cultivated in secondary effluent under mesophilic and thermophilic conditions

Water Science & Technology ◽

10.2166/wst.2015.344 ◽

2015 ◽

Vol 72 (8) ◽

pp. 1398-1403 ◽

Cited By ~ 2

Author(s):

Glenda Cea-Barcia ◽

Gloria Moreno ◽

Germán Buitrón

Keyword(s):

Anaerobic Digestion ◽

Methane Production ◽

Incubation Temperature ◽

Secondary Effluent ◽

Microalgae Culture ◽

Batch Tests ◽

Volatile Solids ◽

Thermophilic Conditions ◽

Maximum Production Rate ◽

Mesophilic Conditions

The anaerobic digestion of mixed indigenous microalgae, grown in a secondary effluent, was evaluated in batch tests at mesophilic (35°C) and thermophilic (50°C) conditions. Under mesophilic conditions, specific methane production varied from 178 to 207 mL CH4/g volatile solids (VS) and the maximum production rate varied from 8.8 to 26.1 mL CH4/(gVS day), depending on the type of microalgae culture. Lower methane parameters were observed in those cultures where Scenedesmus represents more than 95% of the microalge. The culture with the lowest digestion performances under mesophilic conditions was studied under thermophilic conditions. The increase in the incubation temperature significantly increased the specific methane production (390 mL CH4/g VS) and rate (26.0 mL CH4/(gVS day)). However, under thermophilic conditions a lag period of 30 days was observed.

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Effects of aerobic and anaerobic digestion systems on pathogen and pathogen indicator reduction in municipal sludge

Water Science & Technology ◽

10.2166/wst.2002.0325 ◽

2002 ◽

Vol 46 (10) ◽

pp. 181-187 ◽

Cited By ~ 8

Author(s):

M.F. Dahab ◽

R.Y. Surampalli

Keyword(s):

Anaerobic Digestion ◽

Anaerobic Treatment ◽

Municipal Sludge ◽

Indicator Organisms ◽

Loading Rates ◽

Solids Loading ◽

Volatile Solids ◽

The Us ◽

Class B ◽

Us Epa

In this study, the effectiveness of anaerobic treatment systems in reducing pathogenic density levels was evaluated under the US EPA municipal sludge rule (40 CFR Part 503 Rule). Wastewater and sludge samples were analyzed for both pathogens and pathogenic indicator organisms from six different existing wastewater treatment systems. The results indicate that Class B sludge requirements under the US 503 Rule are reasonable and can be achievable by the existing treatment systems while Class A sludge requirements under the same rule may not be easily achieved by the existing treatment systems. The effects of volatile solids loading rates on anaerobic digester performance were investigated. Under anaerobic digestion conditions, it appears that the log reductions in fecal coliform and fecal streptococcus appeared to be dependent on VSS loading rates. On the other hand, Salmonella sp. density reductions did not appear to be dependent on VSS loading rates.

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