کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
681688 888959 2011 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Biomass adaptation over anaerobic co-digestion of sewage sludge and trapped grease waste
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تکنولوژی و شیمی فرآیندی
پیش نمایش صفحه اول مقاله
Biomass adaptation over anaerobic co-digestion of sewage sludge and trapped grease waste
چکیده انگلیسی

The feasibility of sewage sludge co-digestion using intermediate waste generated inside a wastewater treatment plant, i.e. trapped grease waste from the dissolved air flotation unit, has been assessed in a continuous stirred lab reactor operating at 35 °C with a hydraulic retention time of 20 days. Three different periods of co-digestion were carried out as the grease waste dose was increased. When the grease waste addition was 23% of the volatile solids fed (organic loading rate 3.0 kgCOD m−3 d−1), an increase in methane yield of 138% was reported. Specific activity tests suggested that anaerobic biomass had adapted to the co-substrate. The adapted inoculum showed higher acetoclastic methanogenic and β-oxidation synthrophic acetogenic activities but lower hydrogenotrophic methanogenic activity. The results indicate that a slow increase in the grease waste dose could be a strategy that favours biomass acclimation to fat-rich co-substrate, increases long chain fatty acid degradation and reduces the latter’s inhibitory effect.


► Trapped grease waste is a suitable co-substrate to sewage sludge anaerobic digestion.
► Co-digestion of SS and GW increases biogas production more than two times.
► Specific activity test are a good tool to understand biomass adaptation process.
► Acclimatization of biomass brought about by slowly increasing the grease waste dose.
► SS and GW co-digestion improves the overall WWTP management.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Bioresource Technology - Volume 102, Issue 13, July 2011, Pages 6830–6836
نویسندگان
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