Biogas Methane

FIGURE 7.2 Stages in biogas and methane production from Jerusalem artichoke. 

Biology and Chemistry of Jerusalem Artichoke Helianthus tuberosus L. 

Biogas and Methane Yields from Jerusalem Artichoke 

Plant Part Biogas (Ikg-1 VS) Methane per Wet Wt. (Ikg-1 VS )z Biogas per Area (m3-ha-1) Methane per Area (m3-ha-1) Reference 

Jerusalem artichoke had a similar methane production potential for repeated cuttings in the Finnish trials, whereas other leafy energy crops assessed, such as giant knotweed (Reynoutria sachalinensis F. Schmidt ex Maxim.) and sugar beet tops (Beta vulgaris L.), had methane potentials that increased at later harvests. Lignin levels were also unusually constant for the tops of Jerusalem artichoke, regardless of maturity, while nonstructural carbohydrates (fructans) increased in the stems 

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Juarez-Rodriguez et al. applied the sludge derived from anaerobically digested cow manure in the production of biogas (methane-air), to maize (Zea mays L.) cultivated in a nutrient-low, alkaline-saline soil with EC 9.4 dS m 1 and pH of 9.3. The results showed that the C02... 

Run Inoculated Manure Straw Volatile solids Biogas Methane... 

Twice BTU yield as Biogas (methane) vs dry/dir. combust. Relatively few large concentrations of animals. 

Under anaerobic (oxygen-free) conditions, a variety of degrading processes are employed by micro-organisms. Most relevant to energy are ethanol production via alcohol fermentation and biogas (methane) production via anaerobic digestion. 

Potential of biogas/methane generation of waste could be also determined experimentally in batch tests, semi-continuous-flow or continuous-flow reactors. Batch tests are based on measurement of the amount of biogas (and the concentration of CH in biogas) isolated during the fermentation of the portion of material placed in a closed vessel. Parameters determined in the batch test are called biogas potential or Biochemical Methane Potential (BMP). A detailed review of conditions in which these tests are conducted is presented in the work made by Angehdaki et al. (2009). 

In continuous and semi continuous-flow systems waste go into reactor continuously or at certain intervals. The introduction of a new portion of feedstock is accompanied by a simultaneous discharge of an equivalent quantity of the batch of reactor. Part of the material leaves the reactor without being completely decomposed. Parameters determined in these systems are called biogas/methane yield. Some results of laboratory estimation of biogas production from waste are presented in Table 2.5. 

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