**Conflict of interest**

*Maize - Production and Use*

Biogas (Billion m3

*Biogas production globally from 2000 to 2016 [45].*

**Table 3.**

**12**

**Figure 3.**

*Biogas production in continents in 2016 [45].*

means it will be more accessible to microbes [80].

high process yields [81] (**Table 3**) (**Figure 3**).

biogas production [74].

digestate [76, 77].

**4. Conclusions**

advantages over other biofuels, such as bioethanol for the greater energy that produces, for example, a hectare of corn when converted to bioethanol, giving 20 Gj (Giga Joules). Biogas in the same area gives us nearly three times as much as 55 Gj. Maize, energy beet, rye and grass are crops grown commonly in the central, south-eastern Europe and United Kingdom for energy purposes and mainly for

**2000 2005 2010 2015 2016**

) 13.2 23.1 38.7 60.0 60.8

Biogas (EJ) 0.28 0.50 0.84 1.30 1.31

Silage maize is digested anaerobically, a conversion process where organic matter of biomass is converted into methane in four phases by bacteria in the absence of oxygen. The end products of the digestion process are biogas and

A major problem we face with maize is its lignocellulos structure which prevents the process of fermenting. Several technologies have begun solving this problem, making maize commercially viable [78, 79]. To help increase the fermentation rate, we cut maize much shorter than a standard loader to increase the surface, which

Recently, lignocellulosic materials have gained more interest as potential candidates for biogas production, but a large-scale implementation has not been widely adopted, mainly because of the complicated structure of the cell walls of lignocellulosic plants, which makes them resistant to hydrolysis by microbial attack. Therefore, the pretreatment of lignocellulosic material is essential step to achieve

The rapid development of technology and the constant increase in the number of the world's population combined with the pollution of the environment lead to

The authors declare no conflict of interest.
