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Mesophilic anaerobic digestion of pulp and paper industry biosludge-long-term reactor performance and effects of thermal pretreatment

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Mesophilic anaerobic digestion of pulp and paper industry biosludge-long-term reactor performance and effects of thermal pretreatment. / Kinnunen, V.; Ylä-Outinen, A.; Rintala, J.

In: Water Research, Vol. 87, 11500, 15.12.2015, p. 105-111.

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@article{8cab3589b51b4788aa3c48976291305d,
title = "Mesophilic anaerobic digestion of pulp and paper industry biosludge-long-term reactor performance and effects of thermal pretreatment",
abstract = "The pulp and paper industry wastewater treatment processes produce large volumes of biosludge. Limited anaerobic degradation of lignocellulose has hindered the utilization of biosludge, but the processing of biosludge using anaerobic digestion has recently regained interest. In this study, biosludge was used as a sole substrate in long-term (400 d) mesophilic laboratory reactor trials. Nine biosludge batches collected evenly over a period of one year from a pulp and paper industry wastewater treatment plant had different solid and nutrient (nitrogen, phosphorus, trace elements) characteristics. Nutrient characteristics may vary by a factor of 2-11, while biomethane potentials (BMPs) ranged from 89 to 102 NL CH4 kg-1 VS between batches. The BMPs were enhanced by 39-88{\%} with thermal pretreatments at 105-134 °C. Despite varying biosludge properties, stable operation was achieved in reactor trials with a hydraulic retention time (HRT) of 14 d. Hydrolysis was the process limiting step, ceasing gas production when the HRT was shortened to 10 days. However, digestion with an HRT of 10 days was feasible after thermal pretreatment of the biosludge (20 min at 121 °C) due to enhanced hydrolysis. The methane yield was 78 NL CH4 kg-1 VS for untreated biosludge and was increased by 77{\%} (138 NL CH4 kg-1 VS) after pretreatment.",
keywords = "Biogas, Hydrothermal pretreatment, Lignin, Methane production, Secondary sludge, Waste activated sludge",
author = "V. Kinnunen and A. Yl{\"a}-Outinen and J. Rintala",
note = "AUX=keb,{"}Yl{\"a}-Outinen, A.{"}",
year = "2015",
month = "12",
day = "15",
doi = "10.1016/j.watres.2015.08.053",
language = "English",
volume = "87",
pages = "105--111",
journal = "Water Research",
issn = "0043-1354",
publisher = "PERGAMON-ELSEVIER SCIENCE LTD",

}

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TY - JOUR

T1 - Mesophilic anaerobic digestion of pulp and paper industry biosludge-long-term reactor performance and effects of thermal pretreatment

AU - Kinnunen, V.

AU - Ylä-Outinen, A.

AU - Rintala, J.

N1 - AUX=keb,"Ylä-Outinen, A."

PY - 2015/12/15

Y1 - 2015/12/15

N2 - The pulp and paper industry wastewater treatment processes produce large volumes of biosludge. Limited anaerobic degradation of lignocellulose has hindered the utilization of biosludge, but the processing of biosludge using anaerobic digestion has recently regained interest. In this study, biosludge was used as a sole substrate in long-term (400 d) mesophilic laboratory reactor trials. Nine biosludge batches collected evenly over a period of one year from a pulp and paper industry wastewater treatment plant had different solid and nutrient (nitrogen, phosphorus, trace elements) characteristics. Nutrient characteristics may vary by a factor of 2-11, while biomethane potentials (BMPs) ranged from 89 to 102 NL CH4 kg-1 VS between batches. The BMPs were enhanced by 39-88% with thermal pretreatments at 105-134 °C. Despite varying biosludge properties, stable operation was achieved in reactor trials with a hydraulic retention time (HRT) of 14 d. Hydrolysis was the process limiting step, ceasing gas production when the HRT was shortened to 10 days. However, digestion with an HRT of 10 days was feasible after thermal pretreatment of the biosludge (20 min at 121 °C) due to enhanced hydrolysis. The methane yield was 78 NL CH4 kg-1 VS for untreated biosludge and was increased by 77% (138 NL CH4 kg-1 VS) after pretreatment.

AB - The pulp and paper industry wastewater treatment processes produce large volumes of biosludge. Limited anaerobic degradation of lignocellulose has hindered the utilization of biosludge, but the processing of biosludge using anaerobic digestion has recently regained interest. In this study, biosludge was used as a sole substrate in long-term (400 d) mesophilic laboratory reactor trials. Nine biosludge batches collected evenly over a period of one year from a pulp and paper industry wastewater treatment plant had different solid and nutrient (nitrogen, phosphorus, trace elements) characteristics. Nutrient characteristics may vary by a factor of 2-11, while biomethane potentials (BMPs) ranged from 89 to 102 NL CH4 kg-1 VS between batches. The BMPs were enhanced by 39-88% with thermal pretreatments at 105-134 °C. Despite varying biosludge properties, stable operation was achieved in reactor trials with a hydraulic retention time (HRT) of 14 d. Hydrolysis was the process limiting step, ceasing gas production when the HRT was shortened to 10 days. However, digestion with an HRT of 10 days was feasible after thermal pretreatment of the biosludge (20 min at 121 °C) due to enhanced hydrolysis. The methane yield was 78 NL CH4 kg-1 VS for untreated biosludge and was increased by 77% (138 NL CH4 kg-1 VS) after pretreatment.

KW - Biogas

KW - Hydrothermal pretreatment

KW - Lignin

KW - Methane production

KW - Secondary sludge

KW - Waste activated sludge

UR - http://www.scopus.com/inward/record.url?scp=84941946419&partnerID=8YFLogxK

U2 - 10.1016/j.watres.2015.08.053

DO - 10.1016/j.watres.2015.08.053

M3 - Article

VL - 87

SP - 105

EP - 111

JO - Water Research

JF - Water Research

SN - 0043-1354

M1 - 11500

ER -