Ulva rigida seaweed is constituted by ulvan, which a sulfated polysaccharide with uses in wide variety of applications. After the ulvan-oriented extraction process, crystalline and recalcitrant residue, so-called pulp, appears. In this work, residue was valorized through multiple-stage process. The total processing algae consists hot water extraction, acid hydrolysis, ABE fermentation, distillation order to obtain not only ulvan but also butanol bioethanol be used as biofuels simulating two...

Abstract BACKGROUND Biogas is a valuable carbon‐free renewable energy source that can be produced from anaerobic digestion of organic waste. Accordingly, biogas production promoted worldwide in efforts to reduce carbon emissions and optimize the recovery resources waste streams. In this paper bioresidues collected capital area Reykjavik was modelled Aspen Plus v10. RESULTS Municipal solid (MSW), food (FW) lignocellulosic biomass (LCB) were feedstocks used research. A total 16 scenarios...

The global increase in energy consumption, driven by population growth and improved living standards, has led to a heavy reliance on fossil fuels, causing significant environmental concerns. This prompted shift toward sustainable sources, with biomass, especially lignocellulosic forest emerging as key alternative due its abundance carbon-neutral potential. Microwave-assisted pyrolysis (MAP) is an efficient method for converting biomass into valuable bioproducts bioenergy reduced use. review...

Detoxification is required for sugar bioconversion and hydrolyzate valorization within the biorefining concept biofuel or bio-product production. In this work, spent sulfite liquor, which main residue provided from a pulp mill, has been detoxified. Evaporation, overliming, ionic exchange resins, adsorption with activated carbon black were considered to separate sugars inhibitors in lignocellulosic residue. Effectiveness terms of total individual inhibitor removals, losses sugar-to-inhibitor...

Waste from pulp and paper mills consist of sugar-rich fractions comprising hemicellulose derivatives cellulose by-products. A complete characterisation the waste streams is necessary to study possibilities an existing mill. In this work, four chromatographic methods have been developed obtain most suitable method conditions for measuring woody feedstocks, lignocellulosic hydrolysates in sulphite pulping processes. The analysis major minor monosaccharides, aliphatic carboxylic acids furfurals...

The recent recovery processes of electric arc furnace dust (EAFD) include stabilization within materials with potential uses in the construction sector. EAFD by alkaline activation different alumina-silicates, resulting low-cost and environmentally friendly materials. leaching standards European regulations allow evaluating waste products. This work aims to study introduction FA–clay geopolymers, assessing environmental geochemical behavior two scenarios, disposal, utilization. For it,...

The incorporation of coal fly ash (CFA) in fired clay bricks (FCBs), as a replacement, contributes toward cleaner production practices. CFA disposal is an important issue worldwide due to its huge volume and potential negative environmental impacts, currently does not have recovery route high concentration unburned materials. In this study, the impact two CFA, with different content carbon, FAA (low LOI) FAB (high FCBs, from technical point view was conducted. Unburned carbon plays role on...

The European Union is planning a new program to achieve climate neutrality by 2050. In this context, the Icelandic government plans ban registrations of fossil fuel cars after 2030 as one strategies make Iceland carbon-neutral country 2040. Upgraded biogas can be directly used in vehicles with CNG engines, reducing CO2 emissions 80%. paper, several alternatives plants, simulated previous research, were evaluated considering techno-economic and environmental criteria through application...

The transformation of fermentable sugars provided from lignocellulosic wastes into biofuels or bioproducts is a key point at second-generation biorefineries. Spent sulfite liquor xylose-rich hydrolysate constituting the main residue mills producing dissolving cellulose. Due to presence inhibitors in spent liquor, most promising valorization options require detoxification before bioconversion. In this work, multi criteria analysis was implemented select techno-economic and socio-environmental...

A totally chlorine free (TCF) bleaching sequence was studied for an acid sulfite pulp mill that produces dissolving pulps. Laboratory analyses of the last two stages, oxidant-reinforced alkaline extraction stage (EOP), and a subsequent pressurized peroxide with oxygen (PO), were performed on eucalypt had been delignified by ozone (Z) in mill. The goal to predict optimal costs operational conditions (EOP)(PO) partial bleach three different specialty products. Four independent variables...

Coffee, as one of the most consumed beverages, generates a wide variety waste materials that can be used biofuels and bio-products. Conventional pyrolysis in rural areas, improving circular bioeconomy these places. In this work, characterization slow specialty coffee residues, silverskin (CSS), spent (SC) were conducted at temperatures from 300 to 600 °C. Physico-chemical thermal analysis carried out. addition, quantification individual compounds acetic, formic, levulinic acids, caffeine,...

The evolution of lignin, five- and six-carbon sugars, other decomposition products derived from hemicelluloses cellulose was monitored in a sulfite pulp mill. wastewater streams were characterized the mass balances throughout digestion total chlorine free bleaching stages determined. Summative analysis conjunction with parameters highlights some process guidelines valorization alternatives towards transformation traditional factory into lignocellulosic biorefinery. results showed good...

Solidification/stabilization (S/S) of acid waste using Ordinary Portland Cement (OPC) is widely implemented, but, due to the impact on climate change, alternative methods are being investigated. In this work, first, feasibility coal fly-ash/clay-based geopolymers for S/S Zn plant residues (ZPR), Cadmium Sponge (CS), and Anode Mud (AM) proposed as a treatment prior disposal in landfills. Different variables, such type processing, molding (as-received waste), pressing (dried activators,...

Anaerobic digestion of urban organic wastes, farming slurries or sewage sludge is a common practice in waste treatment plants. In the city Reykjavik, fraction constituted by 60% biomass and 40% food will be transformed local company SORPA providing biofuel for up to 10% cars. Such measures belong 2018-2030 Climate Action Plan from Icelandic Government.

Abstract Viscose from dissolving pulp is one of the most used fabrics in world. However, its production involves a very hazardous compound: CS 2 . Therefore, reducing consumption utmost importance. In this sense, can be pretreated, increasing reactivity cellulose and Deep eutectic solvents have been biomass pretreatment as delignifying agents since their selectivity towards lignin high. The ones with lignocellulosic usually comprise quaternary ammonium an organic acid. previous studies,...