Title:
Production and Recovery of Biochar for Agricultural Use, Gas Cleaning and Wastewater Treatment
Author(s):
Panizio, R.M., Assis, A.C., Nobre, C., Hermoso-Orzáez, M., Brito, P.
Document(s):
Paper
Poster
Abstract:
Biochar is a by-product of thermochemical processes such as pyrolysis, torrefaction, or thermal gasification, where conversion takes place in a sub-stoichiometric environment. This biochar as a high carbon content, nutrients with ammonia, high cation exchange capacity, large surface area, and a stable structure. Different raw materials have different properties comparing the biochar, thus presenting different performances. When biochars are produced at high temperatures through thermochemical processes, such as thermal gasification, it is possible to observe a higher surface area and higher carbon content. Adsorption is one of the mechanisms through which biochar reduces the concentration of heavy metals and organic pollutants. Being directly linked to physicochemical properties. The versatility of biochar in interacting with organic and inorganic species is related to its porosity and the presence of surface functional groups. This interaction can be enhanced through activation processes, thereby improving the absorption capacity of the biochar. The use of biochar in soils can be considered an alternative for carbon sequestration and, consequently, a way to mitigate climate change. By incorporating biochar into soils, long-term persistence can be verified, which is associated with an increase in the pH, cation exchange capacity, specific surface area, and abundant surface functional groups. Currently, there is great interest in the production of biochar owing to its energy-storage capability and possible use as anodes, gas, wastewater cleaning, and biofuels. Recently, biochars have attracted considerable interest, mainly because of their low production cost. Owing to its properties as a carbonaceous material, it has exceptional properties for the removal of pollutants from aqueous solutions, specifically, wastewater. The hydrophobic nature of biochars is an important factor in the adsorption efficiency of dissolved organic material fractions, which are mostly present in effluents from water treatment plants and landfill leachates. Biochars can also be used for the removal of emerging contaminants, such as endocrine-disrupting chemicals found in wastewater, and for the removal of herbicides found in water from crop pest control applications, among other contaminants found in effluents. The use of biochars, in addition to helping to reduce greenhouse gas emissions, can also contribute to achieving the United Nations Sustainable Development Goals.
Keywords:
biomass, thermochemical conversion, biochar
Topic:
Biomass Conversion for Bioenergy
Subtopic:
Biomass pre-treatment and production of intermediates
Event:
32nd European Biomass Conference and Exhibition
Session:
4DV.6.6
Pages:
613 - 616
ISBN:
978-88-89407-24-0
Paper DOI:
10.5071/32ndEUBCE2024-4DV.6.6
Price:
FREE
