Influence of Alkaline-Thermal Pretreatment on High-Solids Anaerobic Digestion of Dewatered Activated Sludge
The influence of alkaline (23.77 mg NaOH/g total solid), thermal (134.95 °C), and combined alkaline-thermal pretreatment on parameters of dewatered activated sludge (DAS) during high-solids anaerobic digestion was investigated. Soluble chemical oxygen demand (SCOD), soluble proteins, and VFAs (volat...
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North Carolina State University
2016-11-01
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doaj-63f8e6fc5eed4de2acf569470a54c9602020-11-24T23:13:30ZengNorth Carolina State UniversityBioResources1930-21261930-21262016-11-0112119521010.15376/biores.12.1.195-210Influence of Alkaline-Thermal Pretreatment on High-Solids Anaerobic Digestion of Dewatered Activated SludgeHaigang Guo0Lianzhu Du1Junfeng Liang2Zengjun Yang3Guohua Cui4Keqiang Zhang5Technology transfer center, Hebei University of Engineering; ChinaAgro-Environmental Protection Institute, Ministry of Agriculture; ChinaAgro-Environmental Protection Institute, Ministry of Agriculture; ChinaTechnology transfer center, Hebei University of Engineering; ChinaTechnology transfer center, Hebei University of Engineering; ChinaAgro-Environmental Protection Institute, Ministry of Agriculture; ChinaThe influence of alkaline (23.77 mg NaOH/g total solid), thermal (134.95 °C), and combined alkaline-thermal pretreatment on parameters of dewatered activated sludge (DAS) during high-solids anaerobic digestion was investigated. Soluble chemical oxygen demand (SCOD), soluble proteins, and VFAs (volatile fatty acids) concentrations were significantly higher (by two-fold) in pretreated DAS samples than in the control. During subsequent anaerobic digestion, the concentrations first increased and then decreased. Total chemical oxygen demand (TCOD) decreased by 28.40% to 40.92%, and ammonia nitrogen accumulated during anaerobic digestion. For the alkaline, thermal, and alkaline-thermal pretreatments, daily methane yield significantly increased in mid-anaerobic digestion and cumulative methane yield (CMY) increased by 9.92, 35.25, and 52.95%, respectively, relative to the control. There were clear synergistic effects of alkaline-thermal pretreatment, resulting in a 17.20% increase in CMY compared with the sum of the separate alkaline and thermal pretreatments. Therefore, alkaline-thermal pretreatment was helpful for high-solids anaerobic digestion of DAS and was an effective pretreatment method. Gompertz model fitting to the CMY curve produced determination coefficients (R2) greater than 0.9931 for all pretreatments, which was better than for a first-order kinetic model fitting curve.http://ojs.cnr.ncsu.edu/index.php/BioRes/article/view/BioRes_12_1_195_Guo_Alkaline_Thermal_Pretreatment_Anaerobic_Digestion_SludgeHigh-solid anaerobic digestion; Dewatered activated sludge; Methane yield; Alkaline-thermal pretreatment |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Haigang Guo Lianzhu Du Junfeng Liang Zengjun Yang Guohua Cui Keqiang Zhang |
spellingShingle |
Haigang Guo Lianzhu Du Junfeng Liang Zengjun Yang Guohua Cui Keqiang Zhang Influence of Alkaline-Thermal Pretreatment on High-Solids Anaerobic Digestion of Dewatered Activated Sludge BioResources High-solid anaerobic digestion; Dewatered activated sludge; Methane yield; Alkaline-thermal pretreatment |
author_facet |
Haigang Guo Lianzhu Du Junfeng Liang Zengjun Yang Guohua Cui Keqiang Zhang |
author_sort |
Haigang Guo |
title |
Influence of Alkaline-Thermal Pretreatment on High-Solids Anaerobic Digestion of Dewatered Activated Sludge |
title_short |
Influence of Alkaline-Thermal Pretreatment on High-Solids Anaerobic Digestion of Dewatered Activated Sludge |
title_full |
Influence of Alkaline-Thermal Pretreatment on High-Solids Anaerobic Digestion of Dewatered Activated Sludge |
title_fullStr |
Influence of Alkaline-Thermal Pretreatment on High-Solids Anaerobic Digestion of Dewatered Activated Sludge |
title_full_unstemmed |
Influence of Alkaline-Thermal Pretreatment on High-Solids Anaerobic Digestion of Dewatered Activated Sludge |
title_sort |
influence of alkaline-thermal pretreatment on high-solids anaerobic digestion of dewatered activated sludge |
publisher |
North Carolina State University |
series |
BioResources |
issn |
1930-2126 1930-2126 |
publishDate |
2016-11-01 |
description |
The influence of alkaline (23.77 mg NaOH/g total solid), thermal (134.95 °C), and combined alkaline-thermal pretreatment on parameters of dewatered activated sludge (DAS) during high-solids anaerobic digestion was investigated. Soluble chemical oxygen demand (SCOD), soluble proteins, and VFAs (volatile fatty acids) concentrations were significantly higher (by two-fold) in pretreated DAS samples than in the control. During subsequent anaerobic digestion, the concentrations first increased and then decreased. Total chemical oxygen demand (TCOD) decreased by 28.40% to 40.92%, and ammonia nitrogen accumulated during anaerobic digestion. For the alkaline, thermal, and alkaline-thermal pretreatments, daily methane yield significantly increased in mid-anaerobic digestion and cumulative methane yield (CMY) increased by 9.92, 35.25, and 52.95%, respectively, relative to the control. There were clear synergistic effects of alkaline-thermal pretreatment, resulting in a 17.20% increase in CMY compared with the sum of the separate alkaline and thermal pretreatments. Therefore, alkaline-thermal pretreatment was helpful for high-solids anaerobic digestion of DAS and was an effective pretreatment method. Gompertz model fitting to the CMY curve produced determination coefficients (R2) greater than 0.9931 for all pretreatments, which was better than for a first-order kinetic model fitting curve. |
topic |
High-solid anaerobic digestion; Dewatered activated sludge; Methane yield; Alkaline-thermal pretreatment |
url |
http://ojs.cnr.ncsu.edu/index.php/BioRes/article/view/BioRes_12_1_195_Guo_Alkaline_Thermal_Pretreatment_Anaerobic_Digestion_Sludge |
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