Hydrothermal liquefaction of sewage sludge under isothermal and fast conditions

Lili Qian; Shuzhong Wang; Phillip E. Savage

doi:10.1016/j.biortech.2017.02.017

Hydrothermal liquefaction of sewage sludge under isothermal and fast conditions

Lili Qian, Shuzhong Wang, Phillip E. Savage

Chemical Engineering

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158 Scopus citations

Abstract

We investigated the effects of water loading, sludge moisture content, recovery solvent, and additives on the product yields and compositions from isothermal (673 K, 60 min) and fast (773 K, 1 min) hydrothermal liquefaction (HTL) of sewage sludge. The water loading (which affects pressure within the reactor) plays a small role in product yields. The sludge moisture content had a larger effect with the highest biocrude yields (26.8 wt% from isothermal HTL and 27.5 wt% from fast HTL) being produced from sludge that was 85 wt% moisture. The HTL biocrude from sludge mainly contains long-chain aliphatic hydrocarbon moieties and aliphatic acids. Dichloromethane recovered more biocrude and energy content (∼50%) than did the other solvents tested. Added K₂CO₃, Na₂CO₃, HCOOH, CH₃COOH, MoO₃-CoO/γ-Al₂O₃and Ru/C significantly decrease the biocrude yield when their loadings are 50 wt% of the dried sludge. The additives, excepting carbonates, enhance gasification of sludge.

Original language	English (US)
Pages (from-to)	27-34
Number of pages	8
Journal	Bioresource technology
Volume	232
DOIs	https://doi.org/10.1016/j.biortech.2017.02.017
State	Published - 2017

All Science Journal Classification (ASJC) codes

Bioengineering
Environmental Engineering
Renewable Energy, Sustainability and the Environment
Waste Management and Disposal

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.biortech.2017.02.017

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title = "Hydrothermal liquefaction of sewage sludge under isothermal and fast conditions",

abstract = "We investigated the effects of water loading, sludge moisture content, recovery solvent, and additives on the product yields and compositions from isothermal (673 K, 60 min) and fast (773 K, 1 min) hydrothermal liquefaction (HTL) of sewage sludge. The water loading (which affects pressure within the reactor) plays a small role in product yields. The sludge moisture content had a larger effect with the highest biocrude yields (26.8 wt% from isothermal HTL and 27.5 wt% from fast HTL) being produced from sludge that was 85 wt% moisture. The HTL biocrude from sludge mainly contains long-chain aliphatic hydrocarbon moieties and aliphatic acids. Dichloromethane recovered more biocrude and energy content (∼50%) than did the other solvents tested. Added K2CO3, Na2CO3, HCOOH, CH3COOH, MoO3-CoO/γ-Al2O3and Ru/C significantly decrease the biocrude yield when their loadings are 50 wt% of the dried sludge. The additives, excepting carbonates, enhance gasification of sludge.",

author = "Lili Qian and Shuzhong Wang and Savage, {Phillip E.}",

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year = "2017",

doi = "10.1016/j.biortech.2017.02.017",

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volume = "232",

pages = "27--34",

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T1 - Hydrothermal liquefaction of sewage sludge under isothermal and fast conditions

AU - Qian, Lili

AU - Wang, Shuzhong

AU - Savage, Phillip E.

PY - 2017

Y1 - 2017

N2 - We investigated the effects of water loading, sludge moisture content, recovery solvent, and additives on the product yields and compositions from isothermal (673 K, 60 min) and fast (773 K, 1 min) hydrothermal liquefaction (HTL) of sewage sludge. The water loading (which affects pressure within the reactor) plays a small role in product yields. The sludge moisture content had a larger effect with the highest biocrude yields (26.8 wt% from isothermal HTL and 27.5 wt% from fast HTL) being produced from sludge that was 85 wt% moisture. The HTL biocrude from sludge mainly contains long-chain aliphatic hydrocarbon moieties and aliphatic acids. Dichloromethane recovered more biocrude and energy content (∼50%) than did the other solvents tested. Added K2CO3, Na2CO3, HCOOH, CH3COOH, MoO3-CoO/γ-Al2O3and Ru/C significantly decrease the biocrude yield when their loadings are 50 wt% of the dried sludge. The additives, excepting carbonates, enhance gasification of sludge.

AB - We investigated the effects of water loading, sludge moisture content, recovery solvent, and additives on the product yields and compositions from isothermal (673 K, 60 min) and fast (773 K, 1 min) hydrothermal liquefaction (HTL) of sewage sludge. The water loading (which affects pressure within the reactor) plays a small role in product yields. The sludge moisture content had a larger effect with the highest biocrude yields (26.8 wt% from isothermal HTL and 27.5 wt% from fast HTL) being produced from sludge that was 85 wt% moisture. The HTL biocrude from sludge mainly contains long-chain aliphatic hydrocarbon moieties and aliphatic acids. Dichloromethane recovered more biocrude and energy content (∼50%) than did the other solvents tested. Added K2CO3, Na2CO3, HCOOH, CH3COOH, MoO3-CoO/γ-Al2O3and Ru/C significantly decrease the biocrude yield when their loadings are 50 wt% of the dried sludge. The additives, excepting carbonates, enhance gasification of sludge.

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EP - 34

JO - Bioresource technology

JF - Bioresource technology

ER -

Hydrothermal liquefaction of sewage sludge under isothermal and fast conditions

Abstract

All Science Journal Classification (ASJC) codes

UN SDGs

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