Electrochemical/peroxydisulfate/Fe3+ treatment of landfill leachate nanofiltration concentrate after ultrafiltration

Cui, Yu-Hong; Xue, Wei-Jun; Yang, Sui-Qin; Tu, Jialing; Guo, Xing Peng; Liu, Zheng-Qian

doi:10.1016/j.cej.2018.07.101

Cited by 74 publications

(24 citation statements)

References 55 publications

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“…Persulfate electro-activation with metal ions addition was applied in the treatment of SLL [ 35 ], SLL nanofiltration concentrate [ 36 ], mixed industrial wastewater [ 37 ], olive mill wastewater [ 38 ], and dyeing wastewater [ 24 ]. Table 3 summarizes the conditions used in these studies, as well as the main results obtained.…”

Section: Treatment Of Complex Wastewater Matrices By Electro-persulfate Processesmentioning

confidence: 99%

Electro-Persulfate Processes for the Treatment of Complex Wastewater Matrices: Present and Future

et al. 2021

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Complex wastewater matrices present a major environmental concern. Besides the biodegradable organics, they may contain a great variety of toxic chemicals, heavy metals, and other xenobiotics. The electrochemically activated persulfate process, an efficient way to generate sulfate radicals, has been widely applied to the degradation of such complex effluents with very good results. This review presents the fundamentals of the electro-persulfate processes, highlighting the advantages and limitations, followed by an exhaustive evaluation on the application of this process for the treatment of complex industrial effluents. An overview of the main relevant experimental parameters/details and their influence on the organic load removal is presented and discussed, having in mind the application of these technologies at an industrial scale. Finally, the future perspectives for the application of the electro-persulfate processes in the treatment of complex wastewater matrices is outlined.

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Section: Treatment Of Complex Wastewater Matrices By Electro-persulfate Processesmentioning

confidence: 99%

Electro-Persulfate Processes for the Treatment of Complex Wastewater Matrices: Present and Future

et al. 2021

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“…Consequently, the implementation of complementary treatment alternatives for landfill leachate reverse osmosis concentrate (LLROC) is necessary. Some reported treatment possibilities are: Membrane distillation [17], evaporation [18], and different advanced oxidation process (AOPs), such as electro-oxidation [12,19,20], ozonation [21,22], sulfate radical-based AOPs [23,24], and Fenton processes [25][26][27]. For example, Qi et al (2015) [17] optimized a vacuum distillation membrane system for LLROC, achieving a 97% chemical oxygen demand (COD) removal at a vacuum pressure of 0.08 MPa and a temperature of 75 • C for a flux of 200 L h −1 .…”

Section: Introductionmentioning

confidence: 99%

Assessing an Integral Treatment for Landfill Leachate Reverse Osmosis Concentrate

et al. 2020

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An integral treatment process for landfill leachate reverse osmosis concentrate (LLROC) is herein designed and assessed aiming to reduce organic matter content and conductivity, as well as to increase its biodegradability. The process consists of three steps. The first one is a coagulation/flocculation treatment, which best results were obtained using a dosage of 5 g L−1 of ferric chloride at an initial pH = 6 (removal of the 76% chemical oxygen demand (COD), 57% specific ultraviolet absorption (SUVA), and 92% color). The second step is a photo-Fenton process, which resulted in an enhanced biodegradability (i.e., the ratio between the biochemical oxygen demand (BOD5) and the COD increased from 0.06 to 0.4), and an extra 43% of the COD was removed at the best trialed reaction conditions of [H2O2]/COD = 1.06, pH = 4 and [H2O2]/[Fe]mol = 45. An ultra violet-A light emitting diode (UVA-LED) lamp was tested and compared to conventional high-pressure mercury vapor lamps, achieving a 16% power consumption reduction. Finally, an optimized 30 g L−1 lime treatment was implemented, which reduced conductivity by a 43%, and the contents of sulfate, total nitrogen, chloride, and metals by 90%. Overall, the integral treatment of LLROC achieved the removal of 99.9% color, 90% COD, 90% sulfate, 90% nitrogen, 86% Al, 77% Zn, 84% Mn, 99% Mg, and 98% Si; and significantly increased biodegradability up to BOD5/COD = 0.4.

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“…Also, other studies suggest that advanced oxidation usage increases biodegradability [14,17]. Coagulation with FeCl 3 at pH 6.0, coupled with the Fe 0 /H 2 O 2 process, proved to have similar efficiency to other processes tested in the available literature, including electrochemical [11,20,36] and advanced oxidation [15][16][17]19,21,25] treatments.…”

Section: Fe 0 /H 2 O 2 Processmentioning

confidence: 65%

“…The worldwide wastewater discharge regulations and standards have become stricter; hence, there is an urgent need to find an effective LL treatment method. Many researchers are investigating new and effective methods for LL treatment, such as sorption on magnetic particles [2] and other sorbents [8], reactive granular filters [9], the use of metallic iron [4,10,11] and other heterogeneous catalysts [12,13], Fenton (classical and solar) [14][15][16][17], electro-Fenton [18,19], and other electrochemical processes [11,[20][21][22][23][24], usage of different oxidants and their combination [25,26], microwaves [10], ultrasounds [27], membrane processes [28], hydrodynamic cavitation [29], microalgae [30], biofiltration [21,31], supercritical water oxidation [32], oscillating biological membrane photoreactors [33], anaerobic digestion [27,34], dynamic membrane bioreactors [35], bio-electro-Fenton [36], upflow sludge bed reactors [37], moving bed biofilm reactors [38], and the sequencing batch reactor [39]. Moreover, a few review articles have summarized the LL treatment methods [40][41][42]…”

Section: Introductionmentioning

confidence: 99%

Treatment of Landfill Leachates with Combined Acidification/Coagulation and the Fe0/H2O2 Process

Bogacki

Marcinowski

El-Khozondar

2019

Water

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One of the major environmental concerns associated with waste disposal is the large amount of generated landfill leachates (LL), which are considered a type of wastewater with a complex composition. There is an urgent need to find an effective LL treatment method. LL were subjected to pretreatment followed by the Fe0/H2O2 process. Pretreatment efficiency was coagulation at pH 6.0 >> coagulation at pH 9.0 > acidification at pH 3.0. Coagulation at pH 6.0 in an optimal Fe3+ dose of 1000 mg/L decreased total organic carbon (TOC) from the initial concentration of 1061 mg/L to 491 mg/L while acidification to pH 3.0 decreased TOC to 824 mg/L. After acidification, the Fe0/H2O2 process with 8000/9200 mg/L Fe0/H2O2 reagent doses decreased TOC to 499 mg/L after a processing time of 60 min. Performance of the Fe0/H2O2 process after coagulation at pH 6.0 for optimal Fe0/H2O2 8000/5540 mg/L reagent doses decreased TOC to 268 mg/L (75% TOC removal). Treatment of landfill leachates with combined process coagulation and Fe0/H2O2 also increased their susceptibility to biodegradation, expressed as the biochemical oxygen demand/chemical oxygen demand (BOD5/COD) ratio from 0.13 to 0.43, allowing LL to be considered as susceptible to biodegradation. Fe0/H2O2 process kinetics was described. A statistical analysis confirmed the obtained results. The proposed method can be successfully applied for LL treatment.

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Electrochemical/peroxydisulfate/Fe3+ treatment of landfill leachate nanofiltration concentrate after ultrafiltration

Cited by 74 publications

References 55 publications

Electro-Persulfate Processes for the Treatment of Complex Wastewater Matrices: Present and Future

Electro-Persulfate Processes for the Treatment of Complex Wastewater Matrices: Present and Future

Assessing an Integral Treatment for Landfill Leachate Reverse Osmosis Concentrate

Treatment of Landfill Leachates with Combined Acidification/Coagulation and the Fe0/H2O2 Process

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