초록
<P><B>Abstract</B></P> <P>A mathematical model is developed in this study to simulate the performance and fates of carbon (C), nitrogen (N) and phosphorus (P) in wet and high-total solid (TS) anaerobic digestion (AD) processes. The “Anaerobic Digestion Model No. 1” (ADM1) is improved by adding inorganic components and integrating the inhibition of high-TS and liquid-solid processes. The model's outputs are validated with experimental results obtained from a semi-continuous reactor, with pig manure as a single substrate at wet and high-TS operation stages. The predicted C (methane production and volatile fatty acid concentrations), N (ammonia nitrogen concentrations) and P (phosphorus concentrations) fates are reasonable and exhibit good accuracy. The model is subsequently applied to simulate CH<SUB>4</SUB> production under different hydraulic retention times and organic loading rates. The simulation analysis demonstrates that pret-reatments, such as promoting the hydrolysis and biodegradility of substrate and immobilising strains, are necessary in the high-TS AD process for pig manure to enhance performance. This study provides guidance for the future optimisation of process and nutrient recycling in AD.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The fates of C, N and P in the semi-continuous reactor were simulated. </LI> <LI> The improved ADM1 was successfully applied in wet and high-TS AD process. </LI> <LI> The CH<SUB>4</SUB> production for different HRT and OLR was predicted. </LI> <LI> Strategies to promote the CH<SUB>4</SUB> production for pig manure were developed. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>