Anaerobic Digestion for Simultaneous Sewage Sludge Treatment and CO Biomethanation: Process Performance and Microbial Ecology

Micro-aeration as a pretreatment method improves the efficiency of anaerobic digestion of municipal sewage sludge and consequently promotes the methane production.

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Fate of nonylphenol polyethoxylates and nonylphenoxy acetic acids in an anaerobic digestion process for sewage sludge treatment

Water Science & Technology ◽

10.2166/wst.2006.356 ◽

2006 ◽

Vol 53 (11) ◽

pp. 221-226 ◽

Cited By ~ 21

Author(s):

M. Minamiyama ◽

S. Ochi ◽

Y. Suzuki

Keyword(s):

Wastewater Treatment ◽

Anaerobic Digestion ◽

Sewage Sludge ◽

Treatment Process ◽

Sludge Treatment ◽

Testing Apparatus ◽

Anaerobic Digestion Process ◽

Digestion Process ◽

Sewage Sludge Treatment ◽

Acetic Acids

Many environmental problems caused by endocrine disruptors (EDs) have been reported. It is reported that EDs flow into sewage treatment plants, and it has been pointed out that these may be shifted from the wastewater treatment process to the sludge treatment process. Little is known about the fate of EDs accumulated in sewage sludge, so we carried out a study to clarify the fate of EDs in sewage sludge treatment processes, especially in an anaerobic digestion process. In this study, nonylphenol (NP) was selected as a target ED. Nonylphenol ethoxylates (NPnEO) or nonylphenoxy acetic acids (NPnEC), which were the precursor of NP, were added to an anaerobic digestion process, and mass balance was investigated. The following results were obtained from the anaerobic digestion experiments. (1) NP1EO was injected to an anaerobic digestion testing apparatus that was operated at a retention time of approximately 28 d and a temperature of 35 °C with thickened sludge sampled from an actual wastewater treatment plant. Approximately 40% of the injected NP1EO was converted to NP. (2) NP1EC was injected to an anaerobic digestion testing apparatus with thickened sludge. As a result, almost all injected NP1EC was converted to NP. When NP2EC was injected, NP2EC was not converted to NP until the 20th day.

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An introduction of sewage sludge treatment recycling technology through hydrothermal and anaerobic digestion that does not require fossil fuel

Proceedings of the Water Environment Federation ◽

10.2175/193864715819559117 ◽

2015 ◽

Vol 2015 (2) ◽

pp. 1-21

Author(s):

Nobuyuki Shinohara ◽

Kentaro Baba ◽

Shinichiro Okawa ◽

Richard Cornelis de Boer

Keyword(s):

Anaerobic Digestion ◽

Sewage Sludge ◽

Fossil Fuel ◽

Sludge Treatment ◽

Recycling Technology ◽

Sewage Sludge Treatment

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Performance and stability of biogas recirculation-driven anaerobic digestion system coupling with alkali addition strategy for sewage sludge treatment

The Science of The Total Environment ◽

10.1016/j.scitotenv.2021.146966 ◽

2021 ◽

pp. 146966

Author(s):

Jiamin Zhao ◽

Tingting Hou ◽

Zhongfang Lei ◽

Kazuya Shimizu ◽

Zhenya Zhang

Keyword(s):

Anaerobic Digestion ◽

Sewage Sludge ◽

Sludge Treatment ◽

Sewage Sludge Treatment ◽

Alkali Addition ◽

System Coupling

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Coupling Hydrothermal Carbonization with Anaerobic Digestion for Sewage Sludge Treatment: Influence of HTC Liquor and Hydrochar on Biomethane Production

Energies ◽

10.3390/en13236262 ◽

2020 ◽

Vol 13 (23) ◽

pp. 6262 ◽

Cited By ~ 1

Author(s):

Roberta Ferrentino ◽

Fabio Merzari ◽

Luca Fiori ◽

Gianni Andreottola

Keyword(s):

Wastewater Treatment ◽

Anaerobic Digestion ◽

Sewage Sludge ◽

Wastewater Treatment Plants ◽

Hydrothermal Carbonization ◽

Digested Sludge ◽

Sludge Treatment ◽

Secondary Sludge ◽

Sewage Sludge Treatment ◽

Biomethane Production

The present study addresses the coupling of hydrothermal carbonization (HTC) with anaerobic digestion (AD) in wastewater treatment plants. The improvement in biomethane production due to the recycling back to the anaerobic digester of HTC liquor and hydrochar generated from digested sludge is investigated and proved. Mixtures of different compositions of HTC liquor and hydrochar, as well as individual substrates, were tested. The biomethane yield reached 102 ± 3 mL CH4 g−1 COD when the HTC liquor was cycled back to the AD and treated together with primary and secondary sludge. Thus, the biomethane production was almost doubled compared to that of the AD of primary and secondary sludge (55 ± 20 mL CH4 g−1 COD). The benefit is even more significant when both the HTC liquor and the hydrochar were fed to the AD of primary and secondary sludge. The biomethane yield increased up to 187 ± 18 mL CH4 g−1 COD when 45% of hydrochar, with respect to the total feedstock, was added. These results highlight the improvement that the HTC process can bring to AD, enhancing biomethane production and promoting a sustainable solution for the treatment of the HTC liquor and possibly the hydrochar itself.

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