scholarly journals Corrigendum to “Conditioning of resuspension excess sludge with chemical oxidation technology: The respective performance of filtration and expression stage in compression dewatering” [Sep. Purif. Technol. 237 (2020) 116317]

2022 ◽  
Vol 278 ◽  
pp. 119049
Author(s):  
Xun Tan ◽  
Yi Jun Chen ◽  
Qiang Xue ◽  
Yong Wan ◽  
Lei Liu
Keyword(s):  
Chemical Oxidation ◽  
Excess Sludge ◽  
Oxidation Technology

Field evaluation of perox-pure™ chemical oxidation technology

1994 ◽  
Vol 30 (7) ◽  
pp. 95-104 ◽  
Author(s):  
Kirankumar Topudurti ◽  
Michael Keefe ◽  
Patrick Wooliever ◽  
Norma Lewis
Keyword(s):  
Drinking Water ◽  
Organic Compounds ◽  
Environmental Protection Agency ◽  
National Laboratory ◽  
Detection Limits ◽  
Field Evaluation ◽  
Chemical Oxidation ◽  
Innovative Technology ◽  
Oxidation Technology ◽  
Removal Efficiencies

This paper presents the field evaluation results for an advanced chemical oxidation technology developed by Peroxidation Systems, Inc., of Tucson, Arizona. The technology, known as the perox-pure™ technology, was evaluated under the U.S. Environmental Protection Agency Superfund Innovative Technology Evaluation program at Lawrence Livermore National Laboratory (LLNL), Site 300 in Tracy, California, in September 1992. The perox-pure™ technology uses ultraviolet radiation and hydrogen peroxide to oxidize dissolved organic compounds in water. At the LLNL site, this technology was evaluated in treating groundwater contaminated with volatile organic compounds (VOC) including trichloroethene (TCE); tetrachloroethene (PCE); 1,1,1-trichloroethane (TCA); 1,1-dichloroethane (DCA); and chloroform. The perox-pure™ system generally produced an effluent that contained TCE, PCE, and DCA at levels below detection limits, and TCA and chloroform at levels slightly above detection limits. The system achieved maximum removal efficiencies of greater than 99.9, 98.7, and 95.8 percent for TCE, PCE, and DCA, respectively. The system also achieved removal efficiencies of up to 92.9 and 93.6 percent for TCA and chloroform, respectively. The treatment system effluent met California drinking water action levels and federal drinking water maximum contaminant levels for all VOCs at the 95 percent confidence level. Cost analysis indicated that the groundwater remediation cost for a 50-gallon per minute perox-pure™ system would range from $7 to $11 per 1,000 gallons, depending on contaminated groundwater characteristics. Of this total cost, the perox-pure™ system direct treatment cost would range from $3 to $5 per 1,000 gallons.

A UV/Oxidation Technology Demonstration to Treat Ground Water Contaminated with VOCs

1992 ◽  
Vol 25 (11) ◽  
pp. 347-354 ◽  
Author(s):  
K. Topudurti
Keyword(s):  
Organic Contaminants ◽  
The United States ◽  
Chemical Oxidation ◽  
Innovative Technology ◽  
San Jose ◽  
Santa Ana ◽  
Percent Confidence Level ◽  
Volatile Organic ◽  
Oxidation Technology ◽  
Uv Oxidation

This paper presents the field demonstration results of the ultraviolet radiation (UV)/oxidation technology developed by Ultrox International, Santa Ana, California. The technology was demonstrated at the Lorentz Barrel and Drum (LB&D) site in San Jose, California, under the United States Environmental Protection Agency's Superfund Innovative Technology Evaluation program. The UV/oxidation technology uses UV radiation, ozone, and hydrogen peroxide to oxidize organic contaminants present in water. At the LB&D site, this technology was evaluated in treating groundwater contaminated with volatile organic compounds (VOCs). The Ultrox system achieved VOC removals greater than 90 percent. The majority of VOCs were removed through chemical oxidation. However, for a few VOCs, such as 1,1,1-trichloroethane (1,1,1-TCA) and 1,1-dichloroethane (1,1-DCA) stripping also contributed toward removal. The treated groundwater met the applicable discharge standards for disposal into a local waterway at 95 percent confidence level. There were no harmful air emissions from the Ultrox system into the atmosphere.

scholarly journals How Organic Substances Promote the Chemical Oxidative Degradation of Pollutants: A Mini Review

2021 ◽  
Vol 13 (19) ◽  
pp. 10993
Author(s):  
Zhewei Hu ◽  
Jiaqi Shi ◽  
Hao Yang ◽  
Jianbo Huang ◽  
Feng Sheng
Keyword(s):  
Transition Metals ◽  
Metal Organic Framework ◽  
Oxidative Degradation ◽  
Chemical Oxidation ◽  
Organic Substances ◽  
Oxidation Reactions ◽  
Action Mechanisms ◽  
Metal Organic ◽  
Oxidation Technology ◽  
Oxidation Degradation

The promotion of pollutant oxidation degradation efficiency by adding organic catalysts has obtained widespread attention in recent years. Studies have shown that organic substances promote the process of traditional oxidation reactions by accelerating the redox cycle of transition metals, chelating transition metals, activating oxidants directly to generate reactive oxygen species such as hydroxyl and sulfate radical, or changing the electron distribution of the target pollutant. Based on the promotion of typical organic functional groups on the chemical oxidative process, a metal-organic framework has been developed and applied in the field of chemical catalytic oxidation. This manuscript reviewed the types, relative merits, and action mechanisms of common organics which promoted oxidation reactions so as to deepen the understanding of chemical oxidation mechanisms and enhance the practical application of oxidation technology.

Materials Design for the Titanium Scaffold Based Implant

2011 ◽  
Vol 183 ◽  
pp. 225-232 ◽  
Author(s):  
A. Zieliński ◽  
Sylwia Sobieszczyk ◽  
Waldemar Serbiński ◽  
Tomasz Seramak ◽  
A. Ossowska
Keyword(s):  
Porous Titanium ◽  
Chemical Oxidation ◽  
Core Material ◽  
Biological Behavior ◽  
Natural Polymer ◽  
Mathematical Methods ◽  
High Corrosion Resistance ◽  
Oxidation Technology ◽  
Titanium Structure ◽  
Harmful Effects

The main objective of here presented research is a design the scaffold/porous titanium (Ti) alloy based composite material demonstrating better biocompatibility, longer lifetime and bioactivity behaviour for load-bearing implants. The development of such material is proposed by making a number of consecutive tasks. Modelling the mechanical, biomechanical and biological behavior of porous titanium structure and an elaboration of results is performed by mathematical methods, including FEM and fuzzy logic. The development of selected Ti-13Zr-Nb alloy with designed porosity and no harmful effects is made by powder metallurgy (PM) with and without space holders, and by rapid prototyping with an use of selective laser melting (SLM). The development of an oxidation technology resulting in high corrosion resistance and bioactivity is carried out by electrochemical oxidation, gaseous oxidation and chemical oxidation, and their combination. The HA depositon is made by electrochemical and chemical (alternate immersion) methods. The core material is designed as a combination of natural polymer and bioceramics in order to allow slow dissolution followed by stepwise growth of bone tissue and angiogenesis, preventing local inflammation processes, and sustaining the mechanical strength close to that of non-porous material.

Bioadsorption of Multiple Heavy Metal Ions by Rhizophora Apiculate sp. and Elaesis Guineensis sp.

2017 ◽  
Vol 14 (1) ◽  
pp. 15
Author(s):  
M.B. Nicodemus Ujih ◽  
Mohammad Isa Mohamadin ◽  
Milla-Armila Asli ◽  
Bebe Norlita Mohammed
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Removal Efficiency ◽  
Heavy Metal Ions ◽  
Agricultural Waste ◽  
Living Organism ◽  
Heavy Metal Concentration ◽  
Industrial Area ◽  
Electrochemical Treatment ◽  
Chemical Oxidation

Heavy metal ions contamination has become more serious which is caused by the releasing of toxic water from industrial area and landfill that are very harmful to all living organism especially human and can even cause death if contaminated in small amount of heavy metal concentration. Currently, peoples are using classic method namely electrochemical treatment, chemical oxidation/reduction, chemical precipitation and reverse osmosis to eliminate the metal ions from toxic water. Unfortunately, these methods are costly and not environmentally friendly as compared to bioadsorption method, where agricultural waste is used as biosorbent to remove heavy metals. Two types of agricultural waste used in this research namely oil palm mesocarp fiber (Elaesis guineensis sp.) (OPMF) and mangrove bark (Rhizophora apiculate sp.) (MB) biomass. Through chemical treatment, the removal efficiency was found to improve. The removal efficiency is examined based on four specification namely dosage, of biosorbent to adsorb four types of metals ion explicitly nickel, lead, copper, and chromium. The research has found that the removal efficiency of MB was lower than OPMF; whereas, the multiple metals ions removal efficiency decreased in the order of Pb2+ > Cu2+ > Ni2+ > Cr2+.

Effects of Wet Chemical Oxidation on Surface Functionalization and Morphology of Highly Oriented Pyrolytic Graphite

2020 ◽  
Author(s):  
Mikhail Trought ◽  
Isobel Wentworth ◽  
Timothy Leftwich ◽  
Kathryn Perrine
Keyword(s):  
Surface Functionalization ◽  
Functional Group ◽  
Pyrolytic Graphite ◽  
Surface Oxidation ◽  
Chemical Oxidation ◽  
Synthesis Methods ◽  
Acid Solutions ◽  
Highly Oriented Pyrolytic Graphite ◽  
Wet Chemical ◽  
Surface Morphologies

The knowledge of chemical functionalization for area selective deposition (ASD) is crucial for designing the next generation heterogeneous catalysis. Surface functionalization by oxidation was studied on the surface of highly oriented pyrolytic graphite (HOPG). The HOPG surface was exposed to with various concentrations of two different acids (HCl and HNO3). We show that exposure of the HOPG surface to the acid solutions produce primarily the same -OH functional group and also significant differences the surface topography. Mechanisms are suggested to explain these strikingly different surface morphologies after surface oxidation. This knowledge can be used to for ASD synthesis methods for future graphene-based technologies.

A Solvent Free Synthetic Route for Cerium(IV) Metal-Organic Frame-works with UiO-66 Architecture and Their Photocatalytic Application

2019 ◽  
Author(s):  
Matteo Campanelli ◽  
Tiziana Del Giacco ◽  
Filippo De Angelis ◽  
Edoardo Mosconi ◽  
Marco Taddei ◽  
...  
Keyword(s):  
Density Functional ◽  
Chemical Oxidation ◽  
Solvent Free ◽  
Cerium Ammonium Nitrate ◽  
Benzylic Alcohols ◽  
Near Ultraviolet ◽  
Photocatalytic Application ◽  
Activity Density ◽  
Ultraviolet Light Irradiation ◽  
Metal Organic

<div> <p>A novel solvent-free synthesis for Ce-UiO-66 metal-organic frameworks (MOFs) is presented. The MOFs are obtained by simply grinding the reagents, cerium ammonium nitrate (CAN) and the carboxylic linkers, in a mortar for few minutes with the addition of a small amount of acetic acid (AcOH) as modulator (1.75 eq, o.1 ml). The slurry is then transferred into a 1 ml vial and heated at 120°C for 1 day. The MOFs have been characterized for their composition, crystallinity and porosity and employed as heterogenous catalysts for the photo-oxidation reaction of substituted benzylic alcohols to benzaldaldehydes under near ultraviolet light irradiation. The catalytic performances, such as yield, conversion and kinetics, exceed those of similar systems studied by chemical oxidation and using Ce-MOF as catalyst. Moreover, the MOFs were found to be reusable up to three cycles without loss of activity. Density functional theory (DFT) calculations gave an estimation of the band-gap shift due to the different nature of the linkers used and provide useful information on the catalytic activity experimentally observed.</p> </div>

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