“erasmus+ халқаро кредит мобиллик: таълим ва илмий

 
 
 
 
CREDIT MOBILITY ERASMUS+ 
 ADVANCES IN SCIENCE AND TECHNOLOGY ON ALTERNATIVE ENERGY 
 
Rustamov Akmal Suxrobovich 
Turin Polytechnic University in Tashkent 
UNIVERSITÄT HOHENHEIM, Germany 
Credit Mobility Erasmus + KA107 
April 1, 2017 by July 31, 2017
PhD Exchange:  Landesanstalt für Agrartechnik und Bioenergie 
Tel.: [phone] 
E-mail: [e-mail] 
 
Key words: biogas, digester, anaerobic digestion, reactor,  
Abstract: The article discusses the experience gained by the author on the Earsmus 
project in the direction of alternative energy 
First of all, Universität Hohenheim, Landesanstalt für Agrartechnik und Bioenergie are 
well involved in the biogas industry. During the 4 months of the research internship I got 
feasible knowledge about number of biogas stations in the Stuttgart city especially, 
research biogas plant “Unterrer Lindenhof” design and construction of the biogas 
digester. My intended research covered parameter identification an anaerobic digestion in 
the biogas process. I was given an effort to understand in deep the dry anaerobic 
digestion process, in particular the following research gaps consider: 

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increase the understanding of the effect of the reactor configuration, optimizing 
the operating conditions; 
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increase the understanding of the dry anaerobic digestion processes through the 
comprehensive analysis of the roles of phase separation, microbial community 
distribution patterns, hydrogen ion partial pressure and accumulation of toxic 
compounds; 

understand the different effect of specific process on different TS anaerobic 
digestion processes; 

define optimized reactor configurations in terms of mixing conditions for different 
TS contents in the reactor. This can be addressed performing hydrodynamic tests 
aimed at assessing the mixing effect and the degree of dispersion in the reactor in 
order to define a configuration capable to reduce the dispersion and short-
circuiting problems. 

hydrodynamic experiments on plug flow laboratory scale reactor can be conducted 
with water and tracer, to understand how the hydrodynamic is influenced by flow-
rate variations and reactor configurations (length, diameter, presence of impellers) 
and individuate the degree of dispersion with different flow-rate values. 
Hydrodynamic experiments conducted also in anaerobic conditions with inoculum 
and substrate to assess the effect of the substrate amount in the reactor and TS 
content on the degree of dispersion. Further efforts will be done also to study full-
scale reactor hydrodynamics and to model the AD process considering dispersion 
conditions. 
In my work I also analyzed the operation status in 2016 - 2017 of the full-scale 
research biogas plant “Unterrer Lindenhof (hereafter refer to “BGA ULi”), where 3*923 
m3 complete stirred tank reactor (CSTR) digesters (including Fermenter 1 - F1, 
Fermenter 2 - F2 and secondary digester – 2nd digester) were installed, and with a 
production capacity of 186 kW of electric power generator. BGA ULi is fed with a 
mixture of energy crops and livestock manure, such as grass silage, maize silage, grain, 
GPS and cow manure, liquid manure is fed for adjusting the slurry to be pumpable. The 
plant is operated under mesophilic conditions (i.e., range from 40°C to 52°C) with 
massive amount of measuring devices installed, to assess the operation efficiency in 
various aspects, such as substrates input, biogas production, gas quality, power and 
heating generation, power consumption of each electrical device, operation temperature. 
In 2016, the BGA ULi has been operated for 325 days, and 41 days in January and 
February has stopped for system maintenance. Here are the main summaries: 
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