Carbon Source Recovery from Waste Activated Sludge by Low-Temperature Thermal Hydrolysis ProcessSource: Journal of Environmental Engineering:;2020:;Volume ( 146 ):;issue: 001DOI: 10.1061/(ASCE)EE.1943-7870.0001631Publisher: ASCE
Abstract: To recover a preferred carbon source from waste activated sludge (WAS), this study systematically investigated the effects of a low-temperature thermal hydrolysis process (THP) on WAS solubilization and dewaterability at 25°C–120°C for 60 min. Experimental results indicated that organics [soluble chemical oxygen demand (SCOD), proteins, carbohydrates, and lipids] and nutrients (N and P) were efficiently released into the sludge supernatant after THP. Deoxyribonucleic acid (DNA) tests identified 60°C as the threshold of sludge cell disintegration, which increased DNA from nearly 0–166.64 mg/L. Sludge dewaterability deteriorated after THP, as evidenced by longer filtration times and higher water contents of sludge cake, particularly at 120°C, which was due to the release of abundant soluble extracellular polymeric substances. The optimal heating temperature for carbon source recovery was 80°C, which achieved the highest biodegradability (5-day biochemical oxygen demand/SCOD 0.62), satisfied SCOD/total nitrogen (18.6), and had acceptable dewaterability.
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contributor author | Yuqi Wu | |
contributor author | Yinghe Jiang | |
contributor author | Kang Song | |
date accessioned | 2022-01-30T21:33:31Z | |
date available | 2022-01-30T21:33:31Z | |
date issued | 1/1/2020 12:00:00 AM | |
identifier other | %28ASCE%29EE.1943-7870.0001631.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl1/handle/yetl/4268424 | |
description abstract | To recover a preferred carbon source from waste activated sludge (WAS), this study systematically investigated the effects of a low-temperature thermal hydrolysis process (THP) on WAS solubilization and dewaterability at 25°C–120°C for 60 min. Experimental results indicated that organics [soluble chemical oxygen demand (SCOD), proteins, carbohydrates, and lipids] and nutrients (N and P) were efficiently released into the sludge supernatant after THP. Deoxyribonucleic acid (DNA) tests identified 60°C as the threshold of sludge cell disintegration, which increased DNA from nearly 0–166.64 mg/L. Sludge dewaterability deteriorated after THP, as evidenced by longer filtration times and higher water contents of sludge cake, particularly at 120°C, which was due to the release of abundant soluble extracellular polymeric substances. The optimal heating temperature for carbon source recovery was 80°C, which achieved the highest biodegradability (5-day biochemical oxygen demand/SCOD 0.62), satisfied SCOD/total nitrogen (18.6), and had acceptable dewaterability. | |
publisher | ASCE | |
title | Carbon Source Recovery from Waste Activated Sludge by Low-Temperature Thermal Hydrolysis Process | |
type | Journal Paper | |
journal volume | 146 | |
journal issue | 1 | |
journal title | Journal of Environmental Engineering | |
identifier doi | 10.1061/(ASCE)EE.1943-7870.0001631 | |
page | 6 | |
tree | Journal of Environmental Engineering:;2020:;Volume ( 146 ):;issue: 001 | |
contenttype | Fulltext |