Decomposition of 1,4-dioxane by vacuum ultraviolet irradiation: Study of economic feasibility and by-product formation

Matsushita, Taku; Hirai, Seiji; Ishikawa, Tokiji; Matsui, Yoshihiko; Shirasaki, Nobutaka

doi:10.1016/j.psep.2014.11.005

Cited by 24 publications

(13 citation statements)

References 57 publications

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“…On the other hand, the concentration of H 2 O 2 is also dependent on the pH value of the reaction system. As given in equation (3.2), H 2 O 2 itself is in equilibrium with OH − anions [36]. Additionally, HO 2 • radicals are also in equilibrium with protons ((equation (1.5)).…”

Section: Resultsmentioning

confidence: 99%

UV _{185+254 nm} photolysis of typical thiol collectors: decomposition efficiency, mineralization and formation of sulfur byproducts

et al. 2019

R. Soc. open sci.

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The decomposition of toxic flotation reagents upon UV 185+254 nm irradiation was attractive due to operational simplicity and no dosage of oxidants. In this work, the degradation of typical thiol collectors (potassium ethyl xanthate (PEX), sodium diethyl dithiocarbamate (SDD), O -isopropyl- N -ethyl thionocarbamate (IET) and dianilino dithiophoshoric acid (DDA)) was investigated by UV 185+254 nm photolysis. The degradation efficiencies and mineralization extents of collectors were assessed. The formation of CS 2 and H 2 S byproducts was studied, and the mechanisms of collector degradation were proposed under UV 185+254 nm irradiation. The PEX, SDD and IET were decomposed with nearly 100% removal upon 75 min of UV 185+254 nm irradiation. The decomposition rate constants decreased in the order SDD > PEX > IET ≫ DDA, and the DDA was the refractory collector. After 120 min of UV 185+254 nm irradiation, 15−45% of carbon and 25−75% of sulfur of collectors were completely mineralized, and the mineralization extent decreased in the order PEX > SDD > IET > DDA. The percentage of gaseous sulfur (CS 2 and H 2 S) ranged from 0.48 to 4.85% for four collectors, showing the fraction of emitted sulfur byproducts was small. The aqueous CS 2 concentration increased in the first 10−20 min, and was decreased to a low level of 0.05–0.1 mg l −1 at 120 min. Two mechanisms, i.e. direct UV 254 nm photolysis and indirect oxidation with free radicals, were responsible for collector decomposition in the UV 185+254 nm photolysis.

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Section: Resultsmentioning

confidence: 99%

UV _{185+254 nm} photolysis of typical thiol collectors: decomposition efficiency, mineralization and formation of sulfur byproducts

et al. 2019

R. Soc. open sci.

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“…Electrical energy per order (EE/O) was calculated to assess the efficacy of single or hybrid treatment strategies. Compared with the energy required for AOPs, coagulation and GAC adsorption are considered to be low energy processes . Therefore, only the energies required for UV/H 2 O 2 and ozonation treatment were considered in this case.…”

Section: Resultsmentioning

confidence: 99%

“…Compared with the energy required for AOPs, coagulation and GAC adsorption are considered to be low energy processes. 45,46…”

Section: Comparison Of Individual and Combined Treatment Strategiesmentioning

confidence: 99%

“…Compared with the energy required for AOPs, coagulation and GAC adsorption are considered to be low energy processes. 45,46 Therefore, only the energies required for UV/H 2 O 2 and ozonation treatment were considered in this case. Generally, the energy required for the production of H 2 O 2 is not included in the EE/O calculation.…”

Section: Comparison Of Individual and Combined Treatment Strategiesmentioning

confidence: 99%

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Potential of coagulation/GAC adsorption combined with UV/H₂O₂ and ozonation for removing dissolved organic matter from secondary RO concentrate

Zhang

Lin

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUD Organic contaminants in secondary reverse osmosis (SRO) concentrate pose a severe threat to the ecosystem, due to their potential toxicity. In this study, potential of coagulation/granular activated carbon (GAC) adsorption combined with UV/H2O2 and ozonation for removing organic matter from industrial secondary RO concentrate was systematically investigated. RESULTS Coagulation with 2.0 mmol L−1 FeCl3 yielded 40% removal of dissolved organic carbon (DOC), while adsorption with 5 g L−1 GAC could boost the removal efficiency up to 78.2%. Fractionation results showed that both coagulation and GAC adsorption favored hydrophobic organics. UV/H2O2 oxidation was capable of removing 87.4% of DOC, which outperformed ozonation (58.2%). UV/H2O2 and ozonation showed similar behavior in dissolved organic matter (DOM) degradation: a portion of hydrophobic organics were first transformed into hydrophilic fractions prior to final mineralization. Conclusion Coupling of GAC as post‐treatment with a UV/H2O2 process yielded 97.9% removal of DOC and the corresponding electrical energy per order (EE/O) was decreased from 66.7 to 35.8 kWh m−3. Consequently, a simple UV/H2O2 and GAC hybrid process was proposed to be a suitable method for removing DOM from SRO concentrate. © 2018 Society of Chemical Industry

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“…It is difficult to remove 1,4-dioxane from wastewater through conventional physicochemical processes, such as coagulation and activated carbon adsorption, and biological treatments, such as an activated sludge process, due to its high solubility and poor biodegradability [3][4][5][6]. Thus, an advanced oxidation process (AOP) that combines ozone oxidation, ultraviolet light, Fenton-type reaction, and hydrogen peroxide technologies is the only effective method of decomposing 1,4-dioxane at present [7][8][9][10][11]. However, the AOP requires high volumes of chemical and large amounts of energy, with high operating costs.…”

Section: Introductionmentioning

confidence: 99%

Biological Treatment of 1,4-Dioxane in Wastewater from Landfill by Indigenous Microbes Attached to Flowing Carriers

Yabuki

Yoshida

Daifuku

et al. 2018

J. of Wat. & Envir. Tech.

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Laboratory and field experiments revealed that indigenous microbes attached to flowing carriers can remove 1,4-dioxane, a recalcitrant substance, from wastewater in landfill facilities. The 1,4-dioxane reduction efficiency of microbes collected from two landfills were different. Landfill Y exhibited higher biodegradation activity than landfill Z. The wastewater of landfill Y contained low biodegradable organic matter as the biochemical oxygen demand (BOD)/chemical oxygen demand (COD) ratio was low, and contained a significantly high proportion of organic carbon in 1,4-dioxane to dissolved organic carbon (> 4.0%). These environmental conditions might have contributed to the high 1,4-dioxane degradation activity of the microbes in landfill Y. Furthermore, the results of the batch experiments suggested that reducing biodegradable organic matter by aeration during pretreatment can accelerate biodegradation. The results also showed that the removal rate constant by stripping and biodegradation for both the batches increased with increasing water temperature. At landfill Y, even at a low temperature of 3°C in the aeration tank that received flowing carriers, over 20% of 1,4-dioxane was removed from wastewater, and a removal rate of 57% was observed at 17°C.

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Decomposition of 1,4-dioxane by vacuum ultraviolet irradiation: Study of economic feasibility and by-product formation

Cited by 24 publications

References 57 publications

UV _{185+254 nm} photolysis of typical thiol collectors: decomposition efficiency, mineralization and formation of sulfur byproducts

UV _{185+254 nm} photolysis of typical thiol collectors: decomposition efficiency, mineralization and formation of sulfur byproducts

Potential of coagulation/GAC adsorption combined with UV/H₂O₂ and ozonation for removing dissolved organic matter from secondary RO concentrate

Biological Treatment of 1,4-Dioxane in Wastewater from Landfill by Indigenous Microbes Attached to Flowing Carriers

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Decomposition of 1,4-dioxane by vacuum ultraviolet irradiation: Study of economic feasibility and by-product formation

Cited by 24 publications

References 57 publications

UV 185+254 nm photolysis of typical thiol collectors: decomposition efficiency, mineralization and formation of sulfur byproducts

UV 185+254 nm photolysis of typical thiol collectors: decomposition efficiency, mineralization and formation of sulfur byproducts

Potential of coagulation/GAC adsorption combined with UV/H2O2 and ozonation for removing dissolved organic matter from secondary RO concentrate

Biological Treatment of 1,4-Dioxane in Wastewater from Landfill by Indigenous Microbes Attached to Flowing Carriers

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Product

Resources

About

UV _{185+254 nm} photolysis of typical thiol collectors: decomposition efficiency, mineralization and formation of sulfur byproducts

UV _{185+254 nm} photolysis of typical thiol collectors: decomposition efficiency, mineralization and formation of sulfur byproducts

Potential of coagulation/GAC adsorption combined with UV/H₂O₂ and ozonation for removing dissolved organic matter from secondary RO concentrate