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Leather Waste Hydrolysation, Carbonization, and Microbial Treatment for Nitrogen Recovery by Ryegrass Cultivation.
Materials (Basel)
November 2024
Department of Physical Aspects of Ecoenergy, The Institute of Fluid-Flow Machinery Polish Academy of Sciences, Fiszera 14 St., 80-231 Gdańsk, Poland.
Leather waste contains up to 10% nitrogen (N); thus, combustion or gasification only for the energy recovery would not be rational, if safety standards are met. On the other hand, the chromium (Cr) content exceeding 5% in half of the waste stream (/) is too significant to be applied in agriculture. In this work, four acid hydrolysates from leather waste shavings, both wet-white free of Cr and wet-blue with Cr, were used: two with a mixture of acids and supplemented with Cu, Mn, and Zn, and the other two as semi-products from collagen extraction using hydrochloric acid.
View Article and Find Full Text PDFPorous polymers embedded with iron carbon enhanced densified activated sludge formation and wastewater treatment.
Bioresour Technol
December 2024
Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou 310014, China. Electronic address:
Municipal wastewater treatment plants in China face significant challenges in effectively removing pollutants from low-strength wastewater with a low carbon-to-nitrogen (COD/N) ratio. This study proposes a novel approach incorporating porous polymers embedded with iron-carbon (PP-IC) into an activated sludge system to enhance treatment. The PP-IC accelerated the formation of densified activated sludge (DAS), characterized by small particle sizes (<200 μm), excellent settleability (sludge volume index: 61 mL/g), and improved pollutant removal efficiency, with total nitrogen and total phosphorus removal rates increasing by 14.
View Article and Find Full Text PDFCombined sorption-biodegradation for removal of energetic compounds from stormwater runoff.
J Hazard Mater
November 2024
University of Delaware, Newark, DE 19716, USA.
Munition constituents (MC) in stormwater runoff have the potential to move these pollutants into receiving bodies at military installations. Here we present further evaluation of a passive and sustainable biofilter technology for removal of dissolved MC from simulated surface runoff by combined sorption-biodegradation processes under dynamic flow conditions. Columns were packed with MC sorbents Sphagnum peat moss and cationized (CAT) pine shavings with and without wood-based biochar.
View Article and Find Full Text PDFApplication of waste iron in wet flue gas desulfurization (WFGD) wastewater treatment.
Environ Sci Pollut Res Int
December 2024
Faculty of Building Services, Hydro and Environmental Engineering, Warsaw University of Technology, Ul. Nowowiejska 20 00-653, Warsaw, Poland.
The wet flue gas desulfurization (WFGD) procedure results in wastewater containing a complex mixture of pollutants, including heavy metals and organic compounds, which are hardly degradable and pose significant environmental challenges. Addressing this issue, the proposed approach, incorporating waste iron shavings as a heterocatalyst within a modified Fenton process, represents a sustainable and effective solution for contaminants degrading in WFGD wastewater. Furthermore, this study aligns with the Best Available Techniques (BAT) regulations by meeting the requirement for compound oxidation-replacing the chlorine utilization with the generation of highly reactive radicals-and coagulation, which completes the treatment process.
View Article and Find Full Text PDFCO Photoreduction Under Visible Light by TiO and Carbon Dots Derived from Pyrolized Bio-Oil.
ChemistryOpen
November 2024
Department of Molecular Sciences and Nanosystems, Ca' Foscari University of Venice, via Torino 155, 30172, Venice, Italy.
Herein, we report a study on pyrolysis bio-oil upgrading from leather shaving waste to dope in situ titania (TiO) with carbon dots (cds). The cds doped TiO exhibits remarkable activity as photocatalyst under solar light for the direct conversion of carbon dioxide (CO) and water vapor (HO) to methane (CH). Morover, the catalytic activity also increased under uv radiation.
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