Influence of Alkalinity on the Efficiency and Catalyst Behavior of Photo‐Assisted Processes

Merayo, Noemí; Hermosilla, Daphne; Jefferson, Bruce; Blanco, Ángeles

doi:10.1002/ceat.201400320

Cited by 5 publications

(4 citation statements)

References 40 publications

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“…Similar results were reported by Jamil et al (2011). Moreover, Merayo et al (2016) reported good efficiency for the heterogeneous photo-Fenton treatment of lignin using zero valent iron microspheres as catalyst instead of ferrous iron. Lucas et al (2012) and Fernandes et al (2014) reported effective treatment of pulp mill wastewater with a solar-Fenton process.…”

Section: Fenton and Photo-fenton Processessupporting

confidence: 85%

“…Other factors include the more frequent availability of ozone treatments for bleaching stages in paper mills, as well as some disadvantages of Fenton processes application, such as the production of iron sludge and the requirement of acidic conditions for optimal performance. These drawbacks may be overcome by using heterogeneous catalysts or by applying these treatments at neutral pH (Merayo et al 2016;Hermosilla et al 2012a). Beltrán-Heredia et al (2001) tested the use of sequential treatments with Fenton reagants and ozone.…”

Section: Fenton and Photo-fenton Processesmentioning

confidence: 99%

“…The catalyst is usually a semiconductor material, of which TiO2 particles are the most commonly applied. These methods have been shown to be effective in breaking down organic compounds derived from lignin in the wastewater from pulping and papermaking processes (Catalkaya and Kargi 2008;Merayo et al 2013Merayo et al , 2016. However, Hermosilla et al (2012a) found such a system to be less effective than photo-Fenton treatment in the case considered.…”

Section: Uv-catalysis (With Tio2 or Peroxide)mentioning

confidence: 99%

See 2 more Smart Citations

Wastewater Treatment and Reclamation: A Review of Pulp and Paper Industry Practices and Opportunities

Hubbe

Metts

Hermosilla

et al. 2016

BioRes

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182

112

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The pulp and paper (P&P) industry worldwide has achieved substantial progress in treating both process water and wastewater, thus limiting the discharge of pollutants to receiving waters. This review covers a variety of wastewater treatment methods, which provide P&P companies with costeffective ways to limit the release of biological or chemical oxygen demand, toxicity, solids, color, and other indicators of pollutant load. Conventional wastewater treatment systems, often comprising primary clarification followed by activated sludge processes, have been widely implemented in the P&P industry. Higher levels of pollutant removal can be achieved by supplementary treatments, which can include anaerobic biological stages, advanced oxidation processes, bioreactors, and membrane filtration technologies. Improvements in the performance of wastewater treatment operations often can be achieved by effective measurement technologies and by strategic addition of agents including coagulants, flocculants, filter aids, and optimized fungal or bacterial cultures. In addition, P&P mills can implement upstream process changes, including dissolved-air-flotation (DAF) systems, filtration save-alls, and kidney-like operations to purify process waters, thus reducing the load of pollutants and the volume of effluent being discharged to end-of-pipe wastewater treatment plants. Keywords: Wastewater treatment; Pulp and paper manufacturing; Advanced oxidation; Membrane technologies; Clarification; Activated sludgeContact information: a: North Carolina State University, Dept. of Forest Biomaterials, Campus Box 8005, Raleigh, NC 29695-8005; b: WestRock Company, Water and Waste Treatment, 600 S 8th St, Fernandina Beach, FL 32034; c: Department of Agricultural and Forestry Engineering, University of Valladolid, Campus Duques de Soria, E-42004 Soria, Spain; d: Complutense University of Madrid, Department of Chemical Engineering, Ingn. Quim, Facultad de Ciencias Químicas, Ciudad Universitaria s/n,S-N, E-28040 Madrid, Spain; e: Concordia University, Dept. Bldg. Civil & Environm. Engn., 1455 Maisonneuve Blvd, West Montreal, PQ H3G 1M8, Canada; f: University of Jyväskylä, Dept. Chem., Box 35, FI-40014 Jyväskylä, Finland; g: Department of Biology, Center for Environmental and Marine Studies, CESAM, University of Aveiro, 3810-193 Aveiro, Portugal; h: Department of Environment and Planning, Center for Environmental and Marine Studies, CESAM, Aveiro & Department of Materials and Ceramics, Institute of Materials, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal; i: FPInnovations, 570 St. Jean Blvd., Pointe Claire, PQ H9R 3J9, Canada; * Corresponding author: hubbe@ncsu.edu Contents of the Article INTRODUCTIONThe pulp and paper (P&P) industry occupies a challenging position with respect to the natural environment. On the positive side, the industry is based on the usage of renewable, photosynthetic resources. On the other hand, the industry discharges huge quantities of aqueous effluents. Large volumes (up to 70 m 3 ) of wastewater ...

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Section: Fenton and Photo-fenton Processessupporting

confidence: 85%

Section: Fenton and Photo-fenton Processesmentioning

confidence: 99%

Section: Uv-catalysis (With Tio2 or Peroxide)mentioning

confidence: 99%

See 1 more Smart Citation

Wastewater Treatment and Reclamation: A Review of Pulp and Paper Industry Practices and Opportunities

Hubbe

Metts

Hermosilla

et al. 2016

BioRes

Self Cite

182

112

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show abstract

“… , This possibility would lead to an overall higher concentration of free carbonate anions in the amaranth solutions containing MMC when compared with an amaranth solution containing crystalline MgCO 3 . The radical scavenging properties of CO 3 2– and its affinity to hydroxyl radicals have been well documented, − and this could be an explanation for the lack of catalytic activity from TiO 2 and ZnO in the presence of MMC (in mixture or as a support) in aqueous environments.…”

Section: Resultsmentioning

confidence: 99%

Amorphous Mesoporous Magnesium Carbonate as a Functional Support for UV-Blocking Semiconductor Nanoparticles for Cosmetic Applications

2019

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Highly porous amorphous mesoporous magnesium carbonate (MMC) with a Brunauer–Emmett–Teller (BET) surface area over 600 m2·g–1 was evaluated as a micrometer-sized support for TiO2 and ZnO semiconductor nanoparticles. The resulting MMC-TiO2-ZnO contained 25 wt % TiO2 and 25 wt % ZnO incorporated into an MMC structure without blocking the pores as revealed by nitrogen sorption isotherms, scanning electron microscopy, and transmission electron microscopy. In vitro ultraviolet (UV) light-blocking experiments showed that the MMC-TiO2-ZnO had comparable UV-blocking ability as a TiO2 and ZnO nanoparticle mixture containing the same amount of semiconductor particles without a support. Amaranth dye degradation studies revealed that MMC was able to diminish the catalytic activity of TiO2 and ZnO nanoparticles, possibly due to the presence of free carbonate ions in MMC as well as in the dye solution. In summary, this paper demonstrated for the first time that micrometer-sized particles of the recently emerged MMC materials can be used as a support for sun-blocking semiconductor nanoparticles without compromising their UV blocking ability and with significantly lowered photocatalytic activity. When used in a formulation as a support for semiconductor nanoparticles, MMC may also reduce the risk of nanoparticle exposure, and the high porosity of MMC-TiO2-ZnO may be utilized for the delivery of therapeutic agents to the skin.

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Textile wastewater reuse after additional treatment by Fenton’s reagent

Ribeiro

Starling

Leão

et al. 2016

Environ Sci Pollut Res

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This study verifies textile wastewater reuse treated by the conventional activated sludge process and subjected to further treatment by advanced oxidation processes. Three alternative processes are discussed: Fenton, photo-Fenton, and UV/HO. Evaluation of treatments effects was based on factorial experiment design in which the response variables were the maximum removal of COD and the minimum concentration of residual HO in treated wastewater. Results indicated Fenton's reagent, COD/[HO]/[Fe] mass ratio of 1:2:2, as the best alternative. The selected technique was applied to real wastewater collected from a conventional treatment plant of a textile mill. The quality of the wastewater before and after the additional treatment was monitored in terms of 16 physicochemical parameters defined as suitable for the characterization of waters subjected to industrial textile use. The degradation of the wastewater was also evaluated by determining the distribution of its molecular weight along with the organic matter fractionation by ultrafiltration, measured in terms of COD. Finally, a sample of the wastewater after additional treatment was tested for reuse at pilot scale in order to evaluate the impact on the quality of dyed fabrics. Results show partial compliance of treated wastewater with the physicochemical quality guidelines for reuse. Removal and conversion of high and medium molecular weight substances into low molecular weight substances was observed, as well as the degradation of most of the organic matter originally present in the wastewater. Reuse tests indicated positive results, confirming the applicability of wastewater reuse after the suggested additional treatment. Graphical abstract Textile wastewater samples after additional treatment by Fenton's reagent, photo-Fenton and HO/UV tested in different conditions.

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Influence of Alkalinity on the Efficiency and Catalyst Behavior of Photo‐Assisted Processes

Cited by 5 publications

References 40 publications

Wastewater Treatment and Reclamation: A Review of Pulp and Paper Industry Practices and Opportunities

Wastewater Treatment and Reclamation: A Review of Pulp and Paper Industry Practices and Opportunities

Amorphous Mesoporous Magnesium Carbonate as a Functional Support for UV-Blocking Semiconductor Nanoparticles for Cosmetic Applications

Textile wastewater reuse after additional treatment by Fenton’s reagent

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