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Extensive comparison of methods for removal of organic halogen compounds from pharmaceutical process wastewaters with life cycle, PESTLE, and multi-criteria decision analyses.
J Environ Manage
November 2023
Environmental and Process Engineering Research Group, Department of Chemical and Environmental Process Engineering, Budapest University of Technology and Economics, Műegyetem Rkp. 3, H-1111, Budapest, Hungary. Electronic address:
Recycling and disposing wastewater from the pharmaceutical industry are of utmost importance in mitigating chemical waste generation, where unmanaged hazardous waste fluxes could cause massive environmental damage. Air stripping, steam stripping, distillation, and incineration offer significant emission reduction potentials for pharmaceutical applications; however, selecting specific process units is a complicated task due to the high number of influencing screening criteria. The mentioned chemical processes are modelled with the Aspen Plus program.
View Article and Find Full Text PDFRemoval of nitrogen from low pollution water by long-term operation of an integrated vertical-flow constructed wetland: Performance and mechanism.
Sci Total Environ
February 2019
State Environmental Protection Scientific Observation and Research Station for Lake Dongtinghu (SEPSORSLD), National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, State Key Laboratory of Environmental Criteria an Risk Assessment, Research Centre of Lake Environment, Chinese Research Academy of Environmental Sciences, Beijing 100012, People's Republic of China.
The efficiency of nitrogen removal and its mechanism, aquatic organism distribution characteristics and regeneration capability of zeolite from an integrated vertical-flow constructed wetland (IVFCW) for low pollution water treatment were evaluated after steady and continuous operation for eight years. After running for eight years, better than average COD and NH-N removal were observed in the IVFCW. The NH-N removal rate in this system was controlled by ammoxidation and adsorption and ion exchange of zeolite.
View Article and Find Full Text PDFInsights into the Hydrothermal Stability of Triamine-Functionalized SBA-15 Silica for CO Adsorption.
ChemSusChem
October 2017
Centre for Catalysis Research and Innovation (CCRI), Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada.
The hydrothermal stability of triamine-grafted, large-pore SBA-15 CO adsorbents was studied by using steam stripping. Following two 3 h cycles of steam regeneration, lower CO uptakes, lower CO /N ratios, and slower adsorption kinetics were observed relative to fresh samples, particularly at the lowest adsorption temperature (25 °C). CO adsorption measurements for a selected sample exposed to 48 h of steam stripping depicted that after the initial loss during the first exposure to steam (3-6 h), the adsorptive properties stabilized.
View Article and Find Full Text PDFStructural changes of silica mesocellular foam supported amine-functionalized CO2 adsorbents upon exposure to steam.
ACS Appl Mater Interfaces
November 2010
School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, Georgia 30332, USA.
Three classes of amine-functionalized mesocellular foam (MCF) materials are prepared and evaluated as CO(2) adsorbents. The stability of the adsorbents under steam/air and steam/nitrogen conditions is investigated using a Parr autoclave reactor to simulate, in an accelerated manner, the exposure that such adsorbents will see under steam stripping regeneration conditions at various temperatures. The CO(2) capacity and organic content of all adsorbents decrease after steam treatment under both steam/air and steam/nitrogen conditions, primarily due to structural collapse of the MCF framework, but with additional contributions likely associated with amine degradation during treatment under harsh conditions.
View Article and Find Full Text PDFSteam-stripping for regeneration of supported amine-based CO(2) adsorbents.
ChemSusChem
August 2010
Georgia Institute of Technology, Atlanta, 30332-0100, USA.
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