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    Carbon Source Recovery from Waste Activated Sludge by Low-Temperature Thermal Hydrolysis Process

    Source: Journal of Environmental Engineering:;2020:;Volume ( 146 ):;issue: 001
    Author:
    Yuqi Wu
    ,
    Yinghe Jiang
    ,
    Kang Song
    DOI: 10.1061/(ASCE)EE.1943-7870.0001631
    Publisher: 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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      Carbon Source Recovery from Waste Activated Sludge by Low-Temperature Thermal Hydrolysis Process

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/4268424
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    • Journal of Environmental Engineering

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    contributor authorYuqi Wu
    contributor authorYinghe Jiang
    contributor authorKang Song
    date accessioned2022-01-30T21:33:31Z
    date available2022-01-30T21:33:31Z
    date issued1/1/2020 12:00:00 AM
    identifier other%28ASCE%29EE.1943-7870.0001631.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4268424
    description abstractTo 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.
    publisherASCE
    titleCarbon Source Recovery from Waste Activated Sludge by Low-Temperature Thermal Hydrolysis Process
    typeJournal Paper
    journal volume146
    journal issue1
    journal titleJournal of Environmental Engineering
    identifier doi10.1061/(ASCE)EE.1943-7870.0001631
    page6
    treeJournal of Environmental Engineering:;2020:;Volume ( 146 ):;issue: 001
    contenttypeFulltext
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