Conveners
[EE3] Sustainable organic waste/wastewater management: [EE5] Sustainable organic waste/wastewater management
- Boram Kim (DEEP laboratory INSA Lyon)
Description
Between the issues of natural resources depletion and needs of sustainable municipal waste and wastewater management, the production of biogas from organic waste (including wastewater treatment byproduct) via anaerobic digestion (AD) fits perfectly into the circular economy.
The objective of AD is above all the treatment of organic wastes, avoiding their incineration or storage. The biogas is a gaseous by-product while the digestate is the liquid or solid fraction recovered. The latter can be used as an agricultural amendment. Biogasification allows the development of a local industry and the production of energy within the territories in a delocalized way. Another advantage is that the energy production is continuous, unlike other renewable energies (e.g. photovoltaic or wind power). Moreover, biogas can be used for different purposes: fuel for boilers or engines, fuel for different types of vehicles, domestic use as a replacement for natural gas, etc.
In France, biogas is part of the energy transition and participates in the objectives set by the law of energy transition for a green growth published in the Official Journal on August 18, 2015. This law sets as objectives the reduction of greenhouse gases by 40% between 1990 and 2030, the reduction of primary energy consumption of fossil fuels by 30% in 2030 compared to 2012 and increasing the share of renewable energies to 23% of gross final energy consumption in 2020 and 32% in 2030.
Despite the environmentally benign aspect of AD technology, in Korea, it was not considered as the central treatment method for organic wastes until 2020. However, to meet with the greenhouse gas (GHG) reduction target, there is a huge support driven by legally and economically for the construction of new biogas plant and its efficient operation. Meanwhile, many AD technologies have been developed taking into account feedstocks, microbial stimulations, and process modifications.
In this session, presentations will focus on work on the current development of anaerobic digestion systems for the treatment of municipal organic waste and wastewater, as well as on the treatment of the biogas produced. Discussions between the different speakers will be useful to compare the current situation in South Korea and France (extendable to Europe).
With the tremendous increase of hydrogen production via water electrolysis technology, the development of a recycling process for valuable raw materials is emerging as an important issue for a functional circular economy. Since the size range of the active materials used in polymer electrolyte membrane (PEM) water electrolyzers is well below 100 µm, the development of mechanical separation...
Many WWTPs utilize anaerobic digestion (AD) for primary sludge and secondary sludge because of their efficiency in reducing sludge and recovering energy from it. It is challenging to liberate biodegradable carbohydrates and organic compounds from secondary sludge due to the presence of sludge cells and extracellular polymeric substances (EPS) (Bougrier et al., 2005). A lower biodegradability...
Waste valorization is mandatory to develop and consolidate a circular bioeconomy. It is necessary to search for appropriate processes to add value to different wastes by utilizing them as feedstocks to provide energy,chemicals, and materials. For instance, hydrothermal carbonization (HTC) is an alternative thermochemical process that has been suggested for waste valorization aiming at...
Hydrogen (H2) and methane (CH4) are the two important energy carriers and are usually considered as the cleanest energy form, when they are coming from biomass. However, their content in the biogas is far below the standard limit (>95%), which limits their application without biogas upgrading. Autogenerative high-pressure digestion has the advantage of producing high-calorific biogas directly...
