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  • Aerobic and two-stage anaerobic-aerobic sludge digestion with pure oxygen and air aeration
    Zupančič, Gregor Drago ; Roš, Milenko
    The degradability of excess activated sludge from a wastewater treatment plantwas studied. The objective was establishing the degree of degradation using either air or pure oxygen at different ... temperatures. Sludge treated withpure oxygen was degraded at temperatures from 22 °C to 50 °C while samplestreated with air were degraded between 32 °C and 65 °C. Using air, sludge is efficiently degraded at 37 °C and at 50-55 °C. With oxygen, sludge was most effectively degraded at 38 °C or at 25-30 °C. Two-stage anaerobic-aerobic processes were studied. The first anaerobic stage was alwaysoperated for 5 days HRT, and the second stage involved aeration with pure oxygen and an HRT between 5 and 10 days. Under these conditions, there is53.5% VSS removal and 55.4% COD degradation at 15 days HRT - 5 days anaerobic, 10 days aerobic. Sludge digested with pure oxygen at 25 °C in a batch reactor converted 48% of sludge total Kjeldahl nitrogen to nitrate. Addition of an aerobic stage with pure oxygen aeration to the anaerobic digestion enhances ammonium nitrogen removal. In a two-stage anaerobic-aerobicsludge digestion process within 8 days HRT of the aerobic stage, the removal of ammonium nitrogen was 85%.
    Vir: Bioresource technology. - ISSN 0960-8524 (Vol. 99, no. 1, 2008, str. 100-109)
    Vrsta gradiva - članek, sestavni del
    Leto - 2008
    Jezik - angleški
    COBISS.SI-ID - 3642394

vir: Bioresource technology. - ISSN 0960-8524 (Vol. 99, no. 1, 2008, str. 100-109)
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