Anaerobic digestion - to create value from the waste
Waste is one of the challenges we face.At the same time, mankind has been exploring new methods of reducing and recycling waste - almost all types of waste through different substances and nutrient recycling economy to find new solutions.Also, more and more biomass by using anaerobic digestion is converted to methane, renewal, waste water and other by-products.They can be used in the manufacture of a variety of other products.In this blog post, we understand the basic situation of biogas industry nearly distance, and how it can help to create value from the waste.
What is the methane and anaerobic digestion?
Methane is a gas mixture produced by the anaerobic digestion process, it is a mixture of methane, carbon dioxide and some trace gases.biogas的成分可能会变化，但是通常都包含大约 60–65% 的甲烷和 30–35% 二氧化碳（体积比）以及 ppm 级别的其他气体。沼气由厌氧消化 (AD) 过程产生，离开沼气池时原始气体的含水量取决于细菌加工过程的温度和沼气池内的相对湿度（通常为 100%）。
The AD process
AD process is a kind of need to anaerobic conditions, and several microbial enzyme catalysis process, each of these microbes are indispensable in the whole process.Digestion from the beginning of the hydrolysis, proteins, carbohydrates and lipids is decomposed into smaller molecular fragments.In the process of acidification, these fragments into volatile fatty acid, ammonia (NH3), carbon dioxide (CO2(H) and hydrogen sulfide2S).Acetyl production, some volatile fatty acid is converted into acetic acid (CH3-cooh) group, hydrogen (H2) and CO2.These substances in methanation stage with very convenient, the production of methane bacteria in different biochemical processes turn them into methane (CH4).
Different types of biogas
The international nomenclature and the international energy agency according to used as raw materials sources of waste and its subsequent processing, biogas can be divided into the following categories:
- Methane gas = sludge sewage sludge from wastewater treatment
- Landfill gas = methane produced from non-hazardous waste storage
- Other gas methanation = non-hazardous waste or plant material
Now also appeared the fourth interesting child categories, namely the "gas" from the hot working process, it refers to solid biomass (mainly for the forest residue or fermentable life garbage) biogas generated from the pyrolysis and gasification.This process produces H2And carbon monoxide (CO), which can be converted into synthesis gas instead of natural gas.The European renewable energy promotion association (EurObserv 'Er) has such methane "other biogas" category.
Why methane production?
Biogas production there are two reasons: on the one hand, each country/region to waste digestion, composting in environment friendly way in the treatment of biomass and organic waste nutrients back to the agriculture;On the other hand, the biogas is a kind of renewable energy, USES is very wide.Common solution is to use in the AD pool cogeneration engine combined heat and power (CHP).Now more and more gas is purified and translated into biological methane, which can be distributed in natural gas pipe network or as liquefied natural gas storage.Biological methane can be used as one of the green energy alternatives, support of biological carbon cycle.
Some researchers in rural biogas production is regarded as a means of getting rich, in these areas, the organic waste is a kind of natural renewable resources.Although in the long run, biogas production is just our trip to toward photosynthesis based energy in one step, but in the next few decades, it still has great potential and the urgent demand, especially in solar and wind energy poverty areas.
Want to learn more about visa to pull in the biogas industry?Please visit thewww.dacbvr.tw/biogasFor more information.
Source:
- EurObserv 'Er.https://www.eurobserv-er.org.
- Caruana, d. and Olsen, a. (2011), anaerobic digestion, Nova science press, ProQuest Ebook Central comprehensive academic international version.