Influence of digestion temperature and organic loading rate on the continuous anaerobic treatment of process liquor from hydrothermal carbonization of sewage sludge

Wirth, Benjamin; Reza, M. Toufiq; Mumme, Jan

doi:10.1016/j.biortech.2015.09.022

Cited by 116 publications

(99 citation statements)

References 18 publications

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“…In addition, the methane yield of 180 mLCH 4 /g COD was obtained from the HTLWW obtained by HTL of sewage sludge [35]. The methane yields obtained in the present study were between 217 mLCH 4 /g COD and 314 mLCH 4 /g COD, which was corresponded to 62–90% of the theoretical value (350 mL CH 4 /g COD).…”

Section: Discussionsupporting

confidence: 49%

“…Although there were several studies focusing on the methane production from HTLWW originated from different biomasses [4, 35], the microbial community was seldom investigated. Only our previous study made such analysis and found Firmicutes was dominant in the microbial community during AD of HTLWW [10], which was consistent with the present study.…”

Section: Discussionmentioning

confidence: 99%

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Methane potentials of wastewater generated from hydrothermal liquefaction of rice straw: focusing on the wastewater characteristics and microbial community compositions

Chen

Zhang

Rao

et al. 2017

Biotechnol Biofuels

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BackgroundHydrothermal liquefaction (HTL) has been well studied for the bio-oil production from biomass. However, a large amount of wastewater with high organic content is also produced during the HTL process. Therefore, the present study investigated the methane potentials of hydrothermal liquefaction wastewater (HTLWW) obtained from HTL of rice straw at different temperatures (170–320 °C) and residence times (0.5–4 h). The characteristics (e.g., total organic content, organic species, molecular size distribution, etc.) of the HTLWW were studied, and at the same time, microbial community compositions involved in AD of HTLWW were analyzed.ResultsThe highest methane yield of 314 mL CH4/g COD was obtained from the sample 200 °C–0.5 h (HTL temperature at 200 °C for 0.5 h), while the lowest methane yield 217 mL CH4/g COD was obtained from the sample 320 °C–0.5 h. These results were consistent with the higher amounts of hard biodegradable organics (furans, phenols, etc.) and lower amounts of easily biodegradable organics (sugars and volatile fatty acids) present in sample 320 °C–0.5 h compared to sample 200 °C–0.5 h. Size distribution analysis showed that sample 320 °C–0.5 h contained more organics with molecular size less than 1 kDa (79.5%) compared to sample 200 °C–0.5 h (66.2%). Further studies showed that hard biodegradable organics were present in the organics with molecular size higher than 1 kDa for sample 200 °C–0.5 h. In contrast, those organics were present in both the organics with molecular size higher and less than 1 kDa for sample 320 °C–0.5 h. Microbial community analysis showed that different microbial community compositions were established during the AD with different HTLWW samples due to the different organic compositions. For instance, Petrimonas, which could degrade sugars, had higher abundance in the AD of sample 200 °C–0.5 h (20%) compared to sample 320 °C–0.5 h (7%). The higher abundance of Petrimonas was consistent with the higher content of sugars in sample 200 °C–0.5 h. The higher Petrimonas abundance was consistent with the higher content of sugars in sample 200 °C–0.5 h. The genus Syntrophorhabdus could degrade phenols and its enrichment in the AD of sample 320 °C–0.5 h might be related with the highest content of phenols in the HTLWW.ConclusionsHTL parameters like temperature and residence time affected the biodegradability of HTLWW obtained from HTL of rice straw. More hard biodegradable organics were produced with the increase of HTL temperature. The microbial community compositions during the AD were also affected by the different organic compositions in HTLWW samples.Electronic supplementary materialThe online version of this article (doi:10.1186/s13068-017-0830-0) contains supplementary material, which is available to authorized users.

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Section: Discussionsupporting

confidence: 49%

Section: Discussionmentioning

confidence: 99%

Methane potentials of wastewater generated from hydrothermal liquefaction of rice straw: focusing on the wastewater characteristics and microbial community compositions

Chen

Zhang

Rao

et al. 2017

Biotechnol Biofuels

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“…Besides, the HTC conditions (temperature and time) affect the CODt. Values around 60 g L ‐1 have been reported from HTC of food waste or orange pomace and somewhat lower values (40–50 g L ‐1 ) have been obtained from agro‐industrial residues like chaff, corn silage or thin stillage, while for HTC of primary sewage, mixture of primary and secondary sludge and digested municipal sewage sludge, values of 23, 52.5 and 34 g L ‐1 , respectively, have been reported . Therefore, the liquid fraction from HTC, needs to be conveniently managed before final discharge and moreover its high organic load offers potential interest for the sake of valorisation.…”

Section: Introductionmentioning

confidence: 99%

Valorisation of the liquid fraction from hydrothermal carbonisation of sewage sludge by anaerobic digestion

Villamil

Mohedano

Rodrı́guez

et al. 2017

J of Chemical Tech & Biotech

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BACKGROUND The mesophilic anaerobic digestion of the liquid fraction from hydrothermal carbonisation (208°C, 1 h) of dehydrated sewage sludge has been studied. Two initial inoculum concentrations (IC) (10 and 25 g COD L‐1) and four inoculum to substrate ratios (ISR) (2, 1, 0.5 and 0.4 on a COD basis) have been selected to analyse their influence on the evolution of the anaerobic digestion process. RESULTS The substrate is characterised by a high COD (95.5 g L‐1) and TKN (8.7 g N L‐1) values. High inoculum concentration (25 g COD L‐1) and/or low ISR (≤ 0.5) inhibited methanogenesis due to the high ammonia nitrogen (1.4 g TAN L‐1) and VFA (>4 g COD L‐1) released. For the inhibited samples final COD removals lower than 15% and IA/TA ratios higher than 0.3 were found. The greatest methane yield (177±5 mL CH4 STP g‐1 CODadded) was achieved at 25 g COD L‐1 of IC and at an ISR of 2. CONCLUSION During anaerobic digestion of the liquid fraction from the hydrothermal carbonisation of sewage sludge, the IC and ISR must be adequately selected for proper operation of the process and successful valorisation. According to the results, working at an ISR ≥ 1 is recommended. © 2017 Society of Chemical Industry

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“…Reuse of waste heat (Speidel et al 2015) from combustion of biogas released in subsequent anaerobic fermentation (Reza et al 2014) makes the energy balance of the hydrothermal pretreatment positive and therefore financially attractive (Ruffino et al 2015). This practice, which has been transferred into the commercial sector only recently, results in many technological and economical advantages (Wirth et al 2015). Faster release of easily biodegradable organic matter means savings from mass and volume reduction (Maroušek 2013) and represents new financial opportunities linked with easier dewatering (Ruiz-Hernando et al 2013), stabilization and byproduct recycling (Strong et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Appraisal of changes in sewage sludge management

Vochоzka

Maroušková

Váchal

et al. 2016

Int. J. Environ. Sci. Technol.

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A positive energy balance caused by accelerated production of CH 4 and additional financial benefits associated with shorter retention times, reduction in volumes, easier dewatering, enhanced hygiene, etc., are the reasons why most modern wastewater treatment plants are newly equipped with hydrothermal pretreatment units. This study examined how the changes in composition of the pretreated sewage sludge fermentation residues manifested themselves in subsequent processing by pyrolysis, both in terms of technology and financial impacts. It has been found that concentrations of heavy metals and other hazardous inhibitors might increase; however, the overall biotoxicity is lower due to their immobilization in the charred mass. Moreover, charring of the fermentation residues results in significant financial as well as technological benefits.

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Influence of digestion temperature and organic loading rate on the continuous anaerobic treatment of process liquor from hydrothermal carbonization of sewage sludge

Cited by 116 publications

References 18 publications

Methane potentials of wastewater generated from hydrothermal liquefaction of rice straw: focusing on the wastewater characteristics and microbial community compositions

Methane potentials of wastewater generated from hydrothermal liquefaction of rice straw: focusing on the wastewater characteristics and microbial community compositions

Valorisation of the liquid fraction from hydrothermal carbonisation of sewage sludge by anaerobic digestion

Appraisal of changes in sewage sludge management

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