Catalytic ozonation of organic pollutants from bio-treated dyeing and finishing wastewater using recycled waste iron shavings as a catalyst: Removal and pathways

Wu, Jin; Ma, Lixin; Chen, Yunlu; Cheng, Yunqin; Liu, Yan; Zha, Xiao-song

doi:10.1016/j.watres.2016.01.053

Cited by 159 publications

(53 citation statements)

References 40 publications

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“…Furthermore, the colored form of MB cannot be biodegraded more easily as compared to its reduced colorless form. Several methods have been designed for the removal of MB and other organic pollutants from waste water such as adsorption desorption strategy [3][4][5][6], c-irradiation [7], ozonation [8][9][10], photocatalysis [11][12][13], ion exchange [14], membrane separation [2], reverse or forward osmosis [15], electrochemical methods [16,17], biochemical materials [18][19][20], but all these methods are either very expensive or cannot remove the pollutants completely. Chemical reduction method used to convert these dyes from toxic state to nontoxic or less toxic form is very easy and environmentally friendly, but the reduction of these dyes without catalyst takes much time.…”

Section: Introductionmentioning

confidence: 99%

Ag-loaded thermo-sensitive composite microgels for enhanced catalytic reduction of methylene blue

Shah

Sayed

Fayaz

et al. 2017

Nanotechnol. Environ. Eng.

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In this work, we report the synthesis of composite system pNAC, composed of silver nanoparticles embedded in pure thermo-sensitive crosslinked polymer network of poly(N-isopropylacrylamide-co-acrylamide) (pNA), using as a catalyst for the reduction of methylene blue (MB) dye by sodium borohydride (NaBH 4 ). The pNA was prepared by conventional free radical polymerization technique using sodium dodecyl sulfate as stabilizing agent, followed by in situ reduction of AgNO 3 inside the polymer network by NaBH 4 for the synthesis of composite systems pNACs. The synthesized pNA and pNACs were characterized by FTIR, dynamic light scattering, thermogravimetric analysis, scanning electron microscopy and UV-visible spectroscopy techniques. The materials were found sensitive toward temperature change of the medium. The entrapment ability of pNA toward different amounts of AgNO 3 solution was studied, and effect of metal content on particle size of pNACs was analyzed. The pNACs were applied as a catalyst for the reduction of MB in which they exhibit high catalytic activity and reusability toward the reaction.

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Section: Introductionmentioning

confidence: 99%

Ag-loaded thermo-sensitive composite microgels for enhanced catalytic reduction of methylene blue

Shah

Sayed

Fayaz

et al. 2017

Nanotechnol. Environ. Eng.

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“…Catalytic ozonation processes (COPs) have been identified as efficient methods for the removal of recalcitrant chemicals [4,5]. A wide variety of catalysts are used during COPs for this Deposited Mg and/or Ce oxides formed micro-agglomerates in irregular shapes and sizes ( Figure 2).…”

Section: Introductionmentioning

confidence: 99%

Comparison of Efficiencies and Mechanisms of Catalytic Ozonation of Recalcitrant Petroleum Refinery Wastewater by Ce, Mg, and Ce-Mg Oxides Loaded Al2O3

Chen

Yoza

et al. 2017

Catalysts

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Abstract:The use of catalytic ozonation processes (COPs) for the advanced treatment of recalcitrant petroleum refinery wastewater (RPRW) is rapidly expanding. In this study, magnesium (Mg), cerium (Ce), and Mg-Ce oxide-loaded alumina (Al 2 O 3 ) were developed as cost efficient catalysts for ozonation treatment of RPRW, having performance metrics that meet new discharge standards. Interactions between the metal oxides and the Al 2 O 3 support influence the catalytic properties, as well as the efficiency and mechanism. Mg-Ce/Al 2 O 3 (Mg-Ce/Al 2 O 3 -COP) reduced the chemical oxygen demand by 4.7%, 4.1%, 6.0%, and 17.5% relative to Mg/Al 2 O 3 -COP, Ce/Al 2 O 3 -COP, Al 2 O 3 -COP, and single ozonation, respectively. The loaded composite metal oxides significantly increased the hydroxyl radical-mediated oxidation. Surface hydroxyl groups (-OHs) are the dominant catalytic active sites on Al 2 O 3 . These active surface -OHs along with the deposited metal oxides (Mg 2+ and/or Ce 4+ ) increased the catalytic activity. The Mg-Ce/Al 2 O 3 catalyst can be economically produced, has high efficiency, and is stable under acidic and alkaline conditions.

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“…The wastewater from dyeing and finishing process in the textile industry is characterized by a high content of organic pollutants, which poses a serious environmental pollution if it is not properly treated (Lu et al 2010; Wu et al 2016). The removal of organic pollutants in the dying and finishing wastewater (DFW) has been well studied previously (Hai et al 2007; Pang and Abdullah 2013; Sarayu and Sandhya 2012), and the typically used process for organic removal in textile industry is hydrolysis and acidification, aeration tank and secondary sedimentation.…”

Section: Introductionmentioning

confidence: 99%

“…The removal of organic pollutants in the dying and finishing wastewater (DFW) has been well studied previously (Hai et al 2007; Pang and Abdullah 2013; Sarayu and Sandhya 2012), and the typically used process for organic removal in textile industry is hydrolysis and acidification, aeration tank and secondary sedimentation. The typically used process can also be followed by advanced oxidation to further reduce the organic content in the wastewater (Wu et al 2016). The effluent chemical oxygen demand (COD) can meet the latest discharge limitation for dyeing and finishing in the textile industry by the above process.…”

Section: Introductionmentioning

confidence: 99%

Microbial nitrate removal by waste iron shavings from the biological and catalytic ozonation treated dyeing and finishing wastewater

Chen

Luo

et al. 2017

AMB Expr

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The concentration of total nitrogen (TN) (between 40 and 60 mg/L, mainly nitrate) in the biological and catalytic ozonation treated dyeing and finishing wastewater needs to be reduced before discharge. The present study investigated the feasibility of using waste iron shavings as electron donor for nitrogen removal by biological denitrification. Two anoxic sequencing batch reactors (AnSBR) were continuously operated for more than 100 days. The results showed that the TN removal efficiency increased from 12% in the control reactor (AnSBR-C) to 20% in the reactor with waste iron shavings (AnSBR-Fe). The TN removal was mainly achieved by the reduction of nitrate by heterotrophic denitrification and autotrophic denitrification for AnSBR-Fe. The residual COD (38.4 mg/L) in the effluent of AnSBR-Fe was higher than that (22 mg/L) in the effluent of AnSBR-C, which could be due to that the bacteria preferred to use iron instead of the recalcitrant organics that present in the wastewater. Furthermore, 3DEEM, UHPLC-QTOF and GC–MS analysis were used to characterize the organics in the wastewater, and the results showed that the addition of waste iron shavings affected the degradation of organics during the biological denitrification process.

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Catalytic ozonation of organic pollutants from bio-treated dyeing and finishing wastewater using recycled waste iron shavings as a catalyst: Removal and pathways

Cited by 159 publications

References 40 publications

Ag-loaded thermo-sensitive composite microgels for enhanced catalytic reduction of methylene blue

Ag-loaded thermo-sensitive composite microgels for enhanced catalytic reduction of methylene blue

Comparison of Efficiencies and Mechanisms of Catalytic Ozonation of Recalcitrant Petroleum Refinery Wastewater by Ce, Mg, and Ce-Mg Oxides Loaded Al2O3

Microbial nitrate removal by waste iron shavings from the biological and catalytic ozonation treated dyeing and finishing wastewater

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