Insight into removal TOC and NH4+ from mature landfill leachate using coupled bio-coagulation from Moringa oleifera seeds and ZVI/H2O2 process

Cao, Hue Thi; Khue, Do Ngoc; Nguyen, Nguyen Thi The; Anh, Pham Nguyet; Vu, Hoang Hoa; Hoa, Nguyen Thanh

doi:10.1016/j.jwpe.2021.102112

Cited by 10 publications

(3 citation statements)

References 33 publications

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“…Results show that the model is highly significant ( p < 0.0001) and H 2 O 2 concentration is the only parameter found to be crucial, while the parameters of pH and rotating speed are not significant ( p > 0.05); on the other hand, the interaction effects of the X 2 X 3 , and X 2 X 4 are of high significance ( p < 0.0001). Furthermore, the F ‐value of 18.03 and a low p ‐value (<0.0001) show that the model is highly significant at a 95% confidence level 37 ; the p ‐value of “Lack of fit” is 0.0718 ( p > 0.05 means an insignificant level) also indicating that the established quadratic polynomial regression model is extremely significant and the present model is suitable for our experimental results, which further illustrates the correlation between the experiment results and proposed model results is good 34 . RSM has also been used to optimize the reaction conditions such as H 2 O 2 /Fe 2+ /heat or ZVI/H 2 O 2 process, 37,38 and oxidant dosage is recognized as the most important factor affecting the Fenton‐like reaction, 37 this result is consistent with the conclusion of our study.…”

Section: Resultsmentioning

confidence: 94%

Enhanced removing of cyanobacterium by NZVI coupled with H₂O₂: Influencing factors and removal mechanisms

Ji,

Lu,

Wang

et al. 2024

Env Prog and Sustain Energy

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As advanced oxidation processes (AOPs) is considered to be a highly effective approach for degrading organic pollutants, the simultaneous coagulation and oxidation process by the Fenton‐like reaction of nanoscale zero‐valent iron (NZVI) and hydrogen peroxide (H2O2) is investigated to eliminate the harmful cyanobacterium Microcystis aeruginosa in this study, and the process conditions are optimized using the central composite design of response surface methodology (RSM); in addition, the removal efficiency of M. aeruginosa (in terms of chlorophyll a, Chl a) and the verifications of the antioxidant abilities, as well as extracellular organic matters (EOM) and intracellular organic matters (IOM) are investigated under the optimized conditions. Results indicate that H2O2 concentration is the key factor affecting the Chl a removal efficiency, and the maximum Chl a removal reaches 98.10% under the optimized conditions: NZVI concentration 62.82 mg L−1, H2O2 concentration 54.2 mmol L−1, pH 4.38 and rotating speed 67 rpm. The high correlation coefficient (R2 > 0.80) of analysis of variance (ANOVA) demonstrates the RSM model is extremely significant and suitable for experimental results. Moreover, the total organic carbon (TOC) and fluorescent substances (soluble cyanobacteria metabolic byproducts, aromatic proteins II, humic and fulvic acid‐like compounds) for both EOM and IOM are enhanced removal. It is speculated the removal mechanisms of the Fenton‐like process of NZVI/H2O2 for cyanobacterium belongs to the combined actions of the oxidation of Fe(II)/H2O2 and the coagulation of Fe(III), which destroy the defense system and result in the removal of M. aeruginosa.

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Section: Resultsmentioning

confidence: 94%

Enhanced removing of cyanobacterium by NZVI coupled with H₂O₂: Influencing factors and removal mechanisms

Ji,

Lu,

Wang

et al. 2024

Env Prog and Sustain Energy

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“…OH through Eq. (1-6) and ZVI is dissolved and releases ferrous iron from the surface of ZVI powder under acidic conditions [36]. According to this study, ZVI is very effective material in the removal of DB71 dye [37].…”

Section: Effect Of Zvi Dosage For Color and Cod Removalmentioning

confidence: 88%

Direct Blue 71 Degradation in the Presence of ZVI and H2O2 Advanced Fenton Process: Determination of Optimum Conditions and Kinetics

Ertugay¹,

Acar²

2022

Pol. J. Environ. Stud.

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This study investigated color and COD removal of azo dye Direct Blue 71 (DB71) by a Fenton-like process in zero-valent iron (Fe 0 = ZVI). The UV-vis spectra of DB71 exhibit three main absorption bands -two in the UV region and one in the visible region. UV-vis spectra showed that the azo linkages in the molecule structure of the dyes were destroyed during the decolorization. The influence of various operational parameters such as pH, ZVI dosages, hydrogen peroxide (H 2 O 2 ) concentrations and temperature are studied to determine the optimum conditions for color and COD removal. pH is highly effective parameter of decolorization and COD destruction in this work. However, H 2 O 2 concentration and ZVI dosages were not only effective in the removal of COD for 100 mgL -1 initial DB71 concentration. Therefore, the optimum ZVI:H 2 O 2 ratio is based on determining the value of COD removal. Optimum conditions were accepted to be pH of 2.5, ZVI:H 2 O 2 ratio 4:1 and 20ºC temperature. The result indicated that 100% of decolorization efficiency was achieved within 20 min in the range of 150-400 mg/L initial DB71 concentrations by using optimal conditions. Residual COD values were 15.38, 22.35, 22.58, 27.04, 31.86 mg/L for 150, 200, 250, 300, 400 mg/L initial DB71 concentrations at the end of reaction time, respectively. Additionally, increasing the reaction temperature from 20 to 40ºC negatively affected the decolorization and degradation rate DB71. The experimental kinetic data are fitted very well the Behnajady-Modirshahla-Ghanbery model for color removal of DB71 dye.

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“…Prado et al, 2021 have shown that different proteolytic enzymes can be used to extract protein from a variety of seeds, including Corn, Sorghum, and Sunflower. Previous research investigated enzymeassisted extraction methods for Moriga oleifera seed to apply in coagulation process (Cao et al, 2021). Enzymeassisted extraction can also be more cost-effective than other methods and is considered to be more environmentally friendly.…”

Section: Introductionmentioning

confidence: 99%

Treatment surface water using a novel pumpkin seed-based natural bio-coagulant: optimization by CCD and toxicity evaluation

2023

Global NEST: The International Journal

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This goal of this study was to evaluate the effectiveness of a new coagulant extract from pumpkin seeds (PSC) for removing turbidity and organic compounds from different natural surface waters. Two design experiment methods, namely central composite design (CCD) and response surface methodology (RSM) were used to optimize PSC for removal of turbidity and organic matter via the chemical oxygen demand (COD) of surface water. The CCD results indicated that more than 74.7% of COD and 94.4% of nephelometric turbidity unit (NTUs) were removed under optimized conditions (pH = 7.4; mPSC = 1.5 g/L; time: 88 min). They allowed for final effluent with significantly higher quality in terms of organic content and safe to Vibrio fischeri to be obtained

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Insight into removal TOC and NH4+ from mature landfill leachate using coupled bio-coagulation from Moringa oleifera seeds and ZVI/H2O2 process

Cited by 10 publications

References 33 publications

Enhanced removing of cyanobacterium by NZVI coupled with H₂O₂: Influencing factors and removal mechanisms

Enhanced removing of cyanobacterium by NZVI coupled with H₂O₂: Influencing factors and removal mechanisms

Direct Blue 71 Degradation in the Presence of ZVI and H<sub>2</sub>O<sub>2</sub> Advanced Fenton Process: Determination of Optimum Conditions and Kinetics

Treatment surface water using a novel pumpkin seed-based natural bio-coagulant: optimization by CCD and toxicity evaluation

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Insight into removal TOC and NH4+ from mature landfill leachate using coupled bio-coagulation from Moringa oleifera seeds and ZVI/H2O2 process

Cited by 10 publications

References 33 publications

Enhanced removing of cyanobacterium by NZVI coupled with H2O2: Influencing factors and removal mechanisms

Enhanced removing of cyanobacterium by NZVI coupled with H2O2: Influencing factors and removal mechanisms

Direct Blue 71 Degradation in the Presence of ZVI and H<sub>2</sub>O<sub>2</sub> Advanced Fenton Process: Determination of Optimum Conditions and Kinetics

Treatment surface water using a novel pumpkin seed-based natural bio-coagulant: optimization by CCD and toxicity evaluation

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Enhanced removing of cyanobacterium by NZVI coupled with H₂O₂: Influencing factors and removal mechanisms

Enhanced removing of cyanobacterium by NZVI coupled with H₂O₂: Influencing factors and removal mechanisms