Landfill leachate treatment with Mn and Ce oxides impregnated GAC–ozone treatment process

Wang, Jiann-Ming; Lu, Chung‐Shin; Chen, Yao-Yin; Chang, Da Tian; Fan, Huan‐Jung

doi:10.1016/j.colsurfa.2015.06.042

Cited by 16 publications

(5 citation statements)

References 27 publications

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“…The removal efficiencies of ammonium and TMAH were reduced to 46 and 29%, respectively, due to the presence of t-butanol. In agreement with the findings of Wang et al [38], this result indicated that the hydroxyl radical reaction might play an important role in the removal processes. Kim and Choi [39] This study proposed that MnCe-GAC could enhance the formation of free radicals (such as hydroxyl radicals) in the MnCe-GAC/O 3 /H 2 O 2 process and subsequent oxidation of adsorbed pollutants [34,35].…”

Section: Ch3c(ch3) 2oh +•Ohsupporting

confidence: 93%

“…The removal efficiencies of ammonium and TMAH were reduced to 46 and 29%, respectively, due to the presence of t-butanol. In agreement with the findings of Wang et al [38], this result indicated that the hydroxyl radical reaction might play an important role in the removal processes. Kim and Choi [39] reported that •OH could initiate the degradation of TMAH by either abstracting H-atoms or adding hydrocarbon molecules.…”

Section: Ch3c(ch3) 2oh +•Ohsupporting

confidence: 93%

“…According to RMSE results (Table 2), both pseudo-first-order equation and liquid film diffusion models seem to fit the removal process of ammonium and MEA well with smaller RMSE values (1.31 and 0.43 for ammonium and MEA, respectively). This result is similar to the findings reported by Wang et al [38], who reported that liquid film diffusion was probably the rate limiting step in an MnCe-AC/O 3 process for the removal of humic acid in solution. On the other hand, the intra-particle diffusion model can better describe the removal process of TMAH (with lower RMSE = 0.38).…”

Section: Reaction Kineticssupporting

confidence: 92%

“…However, these models might not be convenient for practical use due to the mathematical complexity of these models [41,42]. Therefore, four simplified models (pseudo-first-order equation or generalized first order equation [41][42][43], pseudo-second-order equation [2], intra-particle diffusion model [2,38,[43][44][45][46], and liquid film diffusion [46]) were applied in this research. Pseudo-first-order equation: , (2) .…”

Section: Reaction Kineticsmentioning

confidence: 99%

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Assessment of an MnCe-GAC Treatment Process for Tetramethylammonium-Contaminated Wastewater from Optoelectronic Industries

et al. 2019

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Nitrogen-containing wastewater is an important issue in optoelectronic and semiconductor industries. Wastewater containing nitrogen compounds such as ammonium, monoethanolamine (MEA), and tetramethylammonium hydroxide (TMAH) must be properly treated due to concerns about health and environmental effects. MnCe-GAC (granular activated carbon) processes were developed in this study for the treatment of TMAH-contaminated wastewater in high-tech industries. The MnCe-GAC processes could effectively remove ammonium, MEA, and TMAH from aqueous solutions. The removal efficiencies of ammonium and MEA by these processes were better than observed for TMAH. Parameters affecting TMAH removal such as type of process, type of wastewater (synthetic or real), pH, salts, and t-butanol were investigated. In general, removal efficiencies of TMAH by various processes were in the following order: MnCe-GAC/O3/H2O2 > MnCe-GAC/O3 > MnCe-GAC/H2O2 > MnCe-GAC > GAC. The negative effect of sulfate and nitrate on pollutant removal might be due to the salting-out effect. Based on t-butanol experiments, the main degradation mechanisms of TMAH by the MnCe-GAC/O3/H2O2 process likely involved hydroxyl radicals. The process proposed in this study could be an effective alternative method for the treatment of high-tech industrial wastewater to meet the new TMAH discharge limit.

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Section: Ch3c(ch3) 2oh +•Ohsupporting

confidence: 93%

“…The removal efficiencies of ammonium and TMAH were reduced to 46 and 29%, respectively, due to the presence of t-butanol. In agreement with the findings of Wang et al [38], this result indicated that the hydroxyl radical reaction might play an important role in the removal processes. Kim and Choi [39] reported that •OH could initiate the degradation of TMAH by either abstracting H-atoms or adding hydrocarbon molecules.…”

Section: Ch3c(ch3) 2oh +•Ohsupporting

confidence: 93%

Section: Reaction Kineticssupporting

confidence: 92%

Section: Reaction Kineticsmentioning

confidence: 99%

See 2 more Smart Citations

Assessment of an MnCe-GAC Treatment Process for Tetramethylammonium-Contaminated Wastewater from Optoelectronic Industries

et al. 2019

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“…Scanning electron microscope images show that after the activation, carbon particles disintegrate and surface of particles become more rough and porous, indicating the reason for high adsorption efficiency of ADA. Wang et al [11] used different methods for the treatment of landfill leachate, such as granular activated carbon (GAC), GAC impregnated with Mn and Ce oxides (MnCe-AC), ozone process (O 3 ), and MnCe-AC integrated with ozone process (MnCe-AC/O 3 ). They showed that humic acids, TOC, and COD removal efficiencies in MnCe-AC/O 3 process were about 90, 68, and 72%, respectively, which were significantly higher than those of ozone, GAC, and MnCe-AC processes alone.…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

Usability of powdered activated carbon for landfill leachate treatment—continued research

Kulikowska

2016

Desalination and Water Treatment

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Adsorption onto activated carbon (AC) is an effective method for the treatment of leachate from mature landfill. However, in order to limit an excessive AC consumption, it is very important to determine the range of doses at which the organics and color removal efficiency increases to the greatest extent. This study compared the usability of two powdered activated carbons (PACs) (CWZ-22 and CWZ-14 with specific area 850 and 750 m 2 /g, respectively) in organics (expressed as COD and UV 254 as index of humic substance concentration) and color (UV 410 ) removal from landfill leachate. CWZ-22 was more efficient than CWZ-14. In both PACs, the highest process efficiency was where doses were between 1 and 3 g/L; higher doses (5-20 g/L) proved less efficient because high PAC consumption yielded several times lower increase in organics and color removal than lower doses. In 1-3 g/L ranges, a 1 g/L increase in CWZ-22 gave an increase of 12.5% (COD), 13.1% (UV 254 ), and 20.0% (UV 410 ) removal efficiency. In higher doses, increases were 1.4, 0.5, and 0.7%, respectively. With both PACs, organics adsorption followed pseudo-second-order kinetics. With CWZ-22 and lower doses, a kinetics constants of adsorption was 1.5-1.9 times higher than CWZ-14.

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An overview of municipal solid waste management and landfill leachate treatment: Malaysia and Asian perspectives

Kamaruddin

Yusoff

Rui

et al. 2017

Environ Sci Pollut Res

175

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Currently, generation of solid waste per capita in Malaysia is about 1.1 kg/day. Over 26,500 t of solid waste is disposed almost solely through 166 operating landfills in the country every day. Despite the availability of other disposal methods, landfill is the most widely accepted and prevalent method for municipal solid waste (MSW) disposal in developing countries, including Malaysia. This is mainly ascribed to its inherent forte in terms cost saving and simpler operational mechanism. However, there is a downside. Environmental pollution caused by the landfill leachate has been one of the typical dilemmas of landfilling method. Leachate is the liquid produced when water percolates through solid waste and contains dissolved or suspended materials from various disposed materials and biodecomposition processes. It is often a high-strength wastewater with extreme pH, chemical oxygen demand (COD), biochemical oxygen demand (BOD), inorganic salts and toxicity. Its composition differs over the time and space within a particular landfill, influenced by a broad spectrum of factors, namely waste composition, landfilling practice (solid waste contouring and compacting), local climatic conditions, landfill's physico-chemical conditions, biogeochemistry and landfill age. This paper summarises an overview of landfill operation and leachate treatment availability reported in literature: a broad spectrum of landfill management opportunity, leachate parameter discussions and the way forward of landfill leachate treatment applicability.

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Landfill leachate treatment with Mn and Ce oxides impregnated GAC–ozone treatment process

Cited by 16 publications

References 27 publications

Assessment of an MnCe-GAC Treatment Process for Tetramethylammonium-Contaminated Wastewater from Optoelectronic Industries

Assessment of an MnCe-GAC Treatment Process for Tetramethylammonium-Contaminated Wastewater from Optoelectronic Industries

Usability of powdered activated carbon for landfill leachate treatment—continued research

An overview of municipal solid waste management and landfill leachate treatment: Malaysia and Asian perspectives

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