کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
242599 501879 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Parameter estimation and long-term process simulation of a biogas reactor operated under trace elements limitation
ترجمه فارسی عنوان
برآورد پارامتر و شبیه سازی فرآیند طولانی مدت یک راکتور بیوگاز که تحت محدودیت عناصر کمیاب عمل می کند
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی مهندسی انرژی و فناوری های برق
چکیده انگلیسی


• Estimation of ADM1 parameter uncertainty by nonlinear, correlated parameter analysis.
• Unbounded confidence regions were obtained for single hydrolysis rate constants.
• ADM1 carbohydrates were divided into a slowly and readily degradable part.
• Bioavailability of trace metals explained discrepancies between modeled and measured data.

The Anaerobic Digestion Model No. 1 (ADM1) was modified to describe the long-term process stability of a two-stage agricultural biogas system operated for 494 days with a mono-substrate. The ADM1 model fraction for carbohydrates was divided into a slowly and readily degradable part. Significant different hydrolysis rate constants were found for proteins and single fractions of carbohydrates in batch experiments. Degradation of starch, xylan (hemicellulose), cellulose and zein (protein) were modeled with first order hydrolysis rate coefficients of 1.20 d−1, 0.70 d−1, 0.18 d−1 and 0.30 d−1, respectively. While the hydrolysis rate coefficients found in batch experiments could be used for predicting continuous process data, the statistically calculated confidence regions (nonlinear parameter estimation) showed that the upper limits were unbounded. Single discrepancies between measured and modeled process data of the two-stage pilot system could be explained by the lack of bioavailability of trace elements. Addition of iron, as Fe(III)Cl3, allowed stable process conditions for an organic loading rate (OLR) up to 2.5 gVS L−1 d−1. Additional supplement of trace elements was necessary for process operation at OLRs above 2.5 gVS L−1 d−1.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Energy - Volume 142, 15 March 2015, Pages 352–360
نویسندگان
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