Photo © Weltec Biopower
Molybdenum in biogas plants
Biogas plants make a valuable contribution to green energy generation : they provide electricity , heat , gas and vehicle fuel , thereby significantly reducing greenhouse gas emissions . Additionally , these plants contribute to the reduction of organic waste . Due to their exceptional corrosion resistance and strength , molybdenum-containing stainless steels have been proven to be an excellent choice for various biogas production applications .
By Martina Helzel , circa drei
Biogas production has huge potential across the globe , as a wide variety of organic materials can be used to produce green energy . The range of feedstock is diverse and includes biomass-containing residual waste such as sewage sludge , biowaste from households and production processes , and food waste . Liquid manure and dung derived from livestock farming , as well as previously unused plants or plant parts , can also be effectively utilized , avoiding the waste of valuable resources . In some countries , specifically cultivated energy crops like corn are grown as renewable raw materials for biogas production .
Biogas production The anaerobic digester or fermenter is the core of the biogas plant . In its oxygen-free environment , various microorganisms , primarily bacteria , break down the organic material in multiple stages resulting in the production of biogas . Most forms of feedstock must be pretreated to enhance digestibility . Some are shredded or ground into smaller parts , depending on the material . The pH value of the biomass , usually between 6.5 to 8 , also affects gas production . The system can be self-heated by the exothermic digestion process , though usually additional heat is provided by burning some of the biogas . Most systems have an operating temperature between 25 ° and 45 ° C . Higher temperatures between 50 ° and 60 ° C are possible to produce gas more quickly . Biogas comprises about 60 % methane and 35 % carbon dioxide , as well as small amounts of other gases . Methane and carbon dioxide are both greenhouse gases that contribute to environmental damage . However , the process of anerobic digestion captures these gases that would otherwise be emitted directly into the atmosphere from the decomposition of organic matter . Since the greenhouse gas potential of methane is many times
30 Stainless Steel World December 2023 www . stainless-steel-world . net