Jie Bai, He Liu*, Bo Yin, Huijun Ma, Xinchun Chen                                                                    ▼全文下载

School  of   Environmental  and   Civil  Engineering,  Jiangnan  University,  214122  Wuxi,  China  

ABSTRACT: This  Anaerobic  acidogenic  fermentation  with  high-solid  sludge  is  a  promising method for volatile fatty acid (VFA) production to realize resource recovery. In this study, to model inhibition by free ammonia in high-solid sludge fermentation, the anaerobic digestion model No. 1 (ADM1) was  modified  to s imulate  the VFA generation in batch,  semi-continuous  and  full  scale  sludge. The ADM1 was operated on the platform AQUASIM 2.0.  Three  kinds of inhibition forms, e.g., simple inhibition, Monod and non-inhibition forms, were integrated into the ADM1 and tested with the  real  experimental  data  for  batch  and  semi-continuous  fermentation,  respectively.  The improved particle swarm optimization technique was used for kinetic parameter estimation using the software MATLAB 7.0. In the modified ADM1, the K_s of acetate is 0.025, the k_m,ac is 12.51, and the K_{I_NH3} is 0.02, respectively. The results showed that the simple inhibition model could simulate the VFA generation accurately while the Monod model was the better inhibition  kinetics  form  in semi-continuous fermentation at pH 10.0.  Finally,  the  modified  ADM1 could successfully describe the VFA generation  and  ammonia  accumulation  in  a  30 m³  full-scale  sludge  fermentation  reactor,  indicating that the developed model can be applicable in high-solid sludge anaerobic fermentation.

KEYWORDS: High-solid sludge; 

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JOURNAL: Journal of Environmental Sciences

YEAR: 2017