Editing Biogas (section)

==== Bio-gas Plants ====
A ''biogas plant'' is the name often given to an [[anaerobic digester]] that treats farm wastes or energy crops. It can be produced using anaerobic digesters (air-tight tanks with different configurations). These plants can be fed with energy crops such as maize [[silage]] or [[biodegradable waste]]s including sewage sludge and food waste. During the process, the micro-organisms transform biomass waste into biogas (mainly methane and carbon dioxide) and [[digestate]]. Higher quantities of biogas can be produced when the wastewater is co-digested with other residuals from the dairy industry, sugar industry, or brewery industry. For example, while mixing 90% of wastewater from beer factory with 10% cow whey, the production of biogas was increased by 2.5 times compared to the biogas produced by wastewater from the brewery only.<ref>{{cite journal|last1=Appels|first1=Lise|last2=Baeyens|first2=Jan|last3=Degrève|first3=Jan|last4=Dewil|first4=Raf|date=2008|title=Principles and potential of the anaerobic digestion of waste-activated sludge|journal=Progress in Energy and Combustion Science|volume=34|issue=6|pages=755–781|doi=10.1016/j.pecs.2008.06.002|bibcode=2008PECS...34..755A |s2cid=95588169 |issn=0360-1285|url=https://lirias.kuleuven.be/handle/123456789/224773}} {{dead link|date=December 2021 |bot=InternetArchiveBot |fix-attempted=yes}}</ref>

Manufacturing of biogas from intentionally planted maize has been described as being unsustainable and harmful due to very concentrated, intense and soil eroding character of these plantations.<ref>{{cite web|date=2014-03-14|title=How a false solution to climate change is damaging the natural world {{!}} George Monbiot|url=http://www.theguardian.com/environment/georgemonbiot/2014/mar/14/uk-ban-maize-biogas|access-date=2021-10-05|website=the Guardian|language=en}}</ref>