PDF Publication Title:
Text from PDF Page: 024
biogas HANDBOOK Days [d] Figure 3.7 Relative biogas yields, depending on temperature and retention time (LfU 2007) Many modern biogas plants operate at thermophilic process temperatures as the thermophilic process provides many advantages, compared to mesophilic and psychrophilic processes: • effective destruction of pathogens • higher grow rate of methanogenic bacteria at higher temperature • reduced retention time, making the process faster and more efficient • improved digestibility and availability of substrates • better degradation of solid substrates and better substrate utilisation • better possibility for separating liquid and solid fractions The thermophilic process has also some disadvantages: • larger degree of imbalance • larger energy demand due to high temperature • higher risk of ammonia inhibition Operation temperature influences the toxicity of ammonia. Ammonia toxicity increases with increasing temperature and can be relieved by decreasing the process temperature. However, when decreasing the temperature to 50°C or below, the growth rate of the thermophilic microorganisms will drop drastically, and a risk of washout of the microbial population can occur, due to a growth rate lower than the actual HRT (ANGELIDAKI 2004). This means that a well functioning thermophilic digester can be loaded to a higher degree or operated at a lower HRT than an e.g. mesophilic one because of the growth rates of thermophilic organisms (Figure 3.8). Experience shows that at high loading or at low HRT, a thermophilic operated digester has higher gas yield and higher conversion rates than a mesophilic digester. 24 Biogas (cumulative) Methane (cumulative)PDF Image | biogas HANDBOOK
PDF Search Title:
biogas HANDBOOKOriginal File Name Searched:
BiogasHandbook.pdfDIY PDF Search: Google It | Yahoo | Bing
Capstone Turbine and Microturbine: Capstone microturbines used and new surplus for sale listing More Info
Consulting and Strategy Services: Need help with Capstone Turbine, sizing systems, applications, or renewable energy strategy, we are here to assist More Info
Container Lumber Dry Kiln: Since 1991 developing and innovating dry kilns using standard shipping containers More Info
Supercritical CO2 Lumber Dry Kiln: Compact fast drying in 3 days or less for small amounts of wood and lumber drying More Info
BitCoin Mining: Bitcoin Mining and Cryptocurrency... More Info
Publications: Capstone Turbine publications for microturbine and distributed energy More Info
FileMaker Software for Renewable Energy Developing database software for the renewable energy industry More Info
CO2 Gas to Liquids On-Demand Production Cart Developing a supercritical CO2 to alcohol on-demand production system (via Nafion reverse fuel cell) More Info
Stranded Gas for low cost power Bitcoin Mining Using stranded gas for generators may provide breakthrough low power costs for cryptocurrency miners. More Info
| CONTACT TEL: 608-238-6001 Email: greg@globalmicroturbine.com | RSS | AMP |