Comparative assessment of the biomass solar pyrolysis biochars combustion behavior and zinc Zn(II) adsorption. (15th December 2022)

• Record Type: Journal Article
• Authors: Dudziak, M.; Werle, S.; Marszałek, A.; Sobek, S.; Magdziarz, A.
• Is Part Of: Energy. Volume 261:Part B(2022)
• Publication Date: 2022-12-15
• Subjects: Zinc adsorption -- Solar pyrolysis -- Biochar -- Bio-adsorbents -- Toxicity analysis -- Combustion kinetics; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Energy consumption -- Periodicals; 333.7905
• DOI: 10.1016/j.energy.2022.125360
• Languages: English
• ISSNs: 0360-5442

Abstract

Abstract: Biochars from solar pyrolysis of the waste straw, and dried sewage sludge, were assessed to recognize the possible application as unconventional adsorbents and fossils replacements for combustion purposes. The adsorption properties of the biochars were characterized by the BET (Brunauer, Emmett, and Teller) surface area, pore volumes, and the degree of Zn(II) adsorption from aqueous solutions. A higher removal degree of zinc ions of 26% was noted for biochars from dried sewage sludge with a BET area of 40.84 m 2 /g, compared to the waste straw biochars with a BET area of 1.67 m 2 /g and a corresponding removal degree of 16%. Both biochars presented more uniform combustion behavior compared to raw biomass, with the ignition and burnout temperatures similar to coal. Solar pyrolysis caused a reduction of the combustion kinetic steps, from multi-step combustion of the raw biomass to a single-step and two-step kinetic mechanisms for the sewage sludge and waste straw biochars respectively. It was found that the waste straw biochars are possible alternative fuels with a higher heating value of 22.6 MJ/kg, while sewage sludge chars presented better zinc adsorption of 2.09 mg/g and a total removal degree of 26%. Highlights: Straw and sewage sludge biochars were assessed as alternative fuels and adsorbents. Straw biochars presented single-step combustion with a calorific value 22.6 MJ/kg. The sewage sludge biochars presented a better zinc removal degree of 26%. Solar pyrolysis processing simplified combustion of biochars compared to raw feed.