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  • enhancement in mesophilic aerobic digestion of waste activated sludge by chemically assisted thermal pretreatment method

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 533
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     the effects of hybrid microwave (mw)-alkali pretreatment methods on the efficiency of mesophilic aerobic digestion were studied. the mw-alkali pretreatment (95 °c-ph 12) was observed to enhance the sludge solubilization synergistically from 0.5% (raw) to 52.5% (mw-naoh) and 48.7% (mw-koh), which are 20% greater than the additive value of mw only and alkali only (16%mw + 28.4%naoh = 44.4% and 16%mw + 25.5koh = 41.5). the higher vss solubilization was observed for hybrid mw-naoh (53.9%) and mw-koh (47.4%) methods. the batch mesophilic (35 °c) aerobic digestion system led to 81.1% tcod degradation and 72.4% vss degradation at 20 days of retention time, with 35% higher tcod and vss reduction in comparison with the control system. the filterability of microwave-alkali pretreated sludge was improved remarkably after aerobic digestion. moreover, the proposed method is capable of effectively sanitize the sewage sludge and produce class a biosolids.

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