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Articles 1 - 4 of 4
Full-Text Articles in Engineering
Investigation Of Bio-Hydrogen And Bio-Methane Production From Thin Stillage, Noha El-Sayed Nasr
Investigation Of Bio-Hydrogen And Bio-Methane Production From Thin Stillage, Noha El-Sayed Nasr
Noha El-Sayed Nasr
An evaluation of single-stage and two-stage anaerobic digestion processes for biomethane and biohydrogen production using thin stillage was performed to assess the viability of biohydrogen production from thin stillage and the impact of separating the acidogenic and methanogenic stages on anaerobic digestion with hydrogen production in the first stage. A comparative evaluation of anaerobic digester sludge (ADS) and acclimatized anaerobic digester sludge (AADS) for biohydrogen production was performed at various S°/X° ratios. The optimum range of S°/X° ratio for hydrogen production was found to be 1 to 2 gCOD/gVSS using conventional ADS and 3 to 6 gCOD/gVSS using AADS. Maximum …
Application Of Artificial Neural Networks For Modeling Of Biohydrogen Production, Noha Nasr, Hisham Hafez, M. Hesham El Naggar, George Nakhla
Application Of Artificial Neural Networks For Modeling Of Biohydrogen Production, Noha Nasr, Hisham Hafez, M. Hesham El Naggar, George Nakhla
Noha El-Sayed Nasr
In this study, an artificial neural network (ANN) model was developed to estimate the hydrogen production profile with time in batch studies. A back propagation artificial neural network ANN configuration of 5-6-4-1 layers was developed. The ANN inputs were the initial pH, initial substrate and biomass concentrations, temperature, and time. The model training was done using 313 data points from 26 published experiments. The correlation coefficient between the experimental and estimated hydrogen production was 0.989 for training, validating, and testing the model. Results showed that the trained ANN successfully predicted the hydrogen production profile with time for new data with …
Comparative Assessment Of Single-Stage And Two-Stage Anaerobic Digestion For The Treatment Of Thin Stillage, Noha Nasr, Elsayed Elbeshbishy, Hisham Hafez, George Nakhla, M. Hesham El Naggar
Comparative Assessment Of Single-Stage And Two-Stage Anaerobic Digestion For The Treatment Of Thin Stillage, Noha Nasr, Elsayed Elbeshbishy, Hisham Hafez, George Nakhla, M. Hesham El Naggar
Noha El-Sayed Nasr
A comparative evaluation of single-stage and two-stage anaerobic digestion processes for biomethane and biohydrogen production using thin stillage was performed to assess the impact of separating the acidogenic and methanogenic stages on anaerobic digestion. Thin stillage, the main by-product from ethanol production, was characterized by high total chemical oxygen demand (TCOD) of 122 g/L and total volatile fatty acids (TVFAs) of 12 g/L. A maximum methane yield of 0.33 L CH4/gCODadded (STP) was achieved in the two-stage process while a single-stage process achieved a maximum yield of only 0.26 L CH4/gCODadded (STP). The separation of acidification stage increased the TVFAs …
Bio-Hydrogen Production From Thin Stillage Using Conventional And Acclimatized Anaerobic Digester Sludge, Noha Nasr, Elsayed Elbeshbishy, Hisham Hafez, George Nakhla, M. Hesham El Naggar
Bio-Hydrogen Production From Thin Stillage Using Conventional And Acclimatized Anaerobic Digester Sludge, Noha Nasr, Elsayed Elbeshbishy, Hisham Hafez, George Nakhla, M. Hesham El Naggar
Noha El-Sayed Nasr
To assess the viability of biohydrogen production from thin stillage, a comparative evaluation of anaerobic digester sludge (ADS) and acclimatized anaerobic digester sludge (AADS) for biohydrogen production over a wide range of S0/X0 ratio (0.5e8 gCOD/gVSS) was performed. A maximum hydrogen yield of 19.5 L H2/L thin stillage was achieved for the AADS while tests with ADS achieved a maximum yield of only 7.5 L H2/L thin stillage. The optimum range of S0/X0 ratio for hydrogen production was found to be 1 to 2 gCOD/gVSS using conventional ADS and 3 to 6 gCOD/gVSS using AADS. The biomass specific hydrogen production …