Anaerobic digestion yields

Anaerobic digestion yields of the slurries are given in Table 2.5. Due to the higher proportion of lipids in manure, the methane production is higher than in wheat straw. The total amounts of lipid and protein, in particular, are lower in straw than in manure and thus the theoretical methane yield is significantly lower in wheat straw than in manure (Table 2.5). The average methane yields of manure and wheat straw were 14.7% and 10.4% of volatile solids, respectively (Demirbas and Ozturk, 2004). 

A modern landfill or an anaerobic digestion fadUty where all or some of the methane is collected. Anaerobic digestion yields methane in place of CO, and the gas has more than 20 times the global... 

Gasification. Conversion of biomass to gaseous fuels can be accompHshed by several methods only two are used by the biomass energy industry (ca 1992). One is thermal gasification in which LHV gas, ie, producer gas, is produced. The other process is anaerobic digestion, which yields an MHVgas. 

The assessment of the sustainability of the cultivation of energy crops includes the input and recycling of nutrients, the application of pesticides, the water-use efficiency, the consumption of fossil fuels and the balance of soil carbon. The aim is to recycle the nutrients, which is simple in the case of anaerobic digestion by applying the digestate to the field. If crops are combusted many of the minerals can be returned via the ash. In the case of liquid biofuels, exported nutrients are lost and have to be replaced. The application of pesticides, mainly herbicides, can often be reduced in comparison to food production, but the energy yield per hectare might be reduced if the share of weeds exceeds certain thresholds. Water use efficiency,... 

The monitoring scheme carried out on 5 Mi-scale plants, 4 demonstrative ones and an experimental one, shows high biogas yield (m3.Kg VS.d ). The anaerobic digestion process is shown to be stable, even when there are falls in digestion temperature, or breaks in the mixing and feeding process. Considerable problems were noted, however,... 

Anaerobic digestion develop cheap simple systems, to operate more reliably with improved gas yields. To develop better methods of utilisation of both the biogas and treated manure while maintaining odour control. 

Liu, H.W. Walter, H.K. Vogt, G.M. Vogt, H.S. Holbein, B.E. Steam pressure disruption of municipal solid waste enhances anaerobic digestion kinetics and biogas yield. Biotechnol. Bioeng. 2002, 77,121-130. 

Ultrasound-assisted anaerobic digestion, which yields characteristic products that are easier to identify and quantify than those from aerobic digestion, is another unexplored area for analytical chemists. 

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