Treatment of formaldehyde wastewater by a membrane-aerated biofilm reactor (MABR): The degradation of formaldehyde in the presence of the cosubstrate methanol

Xiang, Mei; Guo, Zhongwei; Liu, Juan; Bi, Shuqi; Li, Pengpeng; Wang, Yong; Shen, Wentian; Yang, Yang; Wang, Yihan; Yao, Xiao; Xu, Yang; Liu, Yang; Zhao, Lu; Wang, Yuting; Hu, Shuang

doi:10.1016/j.cej.2019.04.184

Cited by 70 publications

(22 citation statements)

References 49 publications

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“…On the basis of the optimized Fenton conditions, the effect of UV alone on formaldehyde removal during the photo-Fenton process was assessed at 215.91 mg/L of formaldehyde; various pH (3)(4)(5)(6)(7)(8)(9)(10)(11) and at four contact times (15 min, 30 min, 60 min and 90 min). As shown in Table 5.…”

Section: Optimization Of Different Fenton Processes In Formaldehyde Removalmentioning

confidence: 99%

“…Water shortage and environmental problems are two of the most challenging topics in the world, which need more attention to tackle [1]. Formaldehyde is extensively used in different fields, such as wood processing; the chemical and petrochemical industries; the production of preservative, resin and textile industries and sterilizing and disinfection [2,3]. Furthermore, contaminated liquids with a high concentration of formaldehyde remain after the dehydrogenation or oxidation of methyl alcohol in various industries, which are discharged to the aquatic environment.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, contaminated liquids with a high concentration of formaldehyde remain after the dehydrogenation or oxidation of methyl alcohol in various industries, which are discharged to the aquatic environment. The concentrations of formaldehyde in industrial effluents can vary from 100 to 10,000 mg/L [3,4]. Formaldehyde is a harmful compound and human carcinogen imposing damages on the environment and human health.…”

Section: Introductionmentioning

confidence: 99%

“…Different processes have been used for the elimination of formaldehyde from wastewater, such as biological processes, adsorption, absorption, condensation, ion exchange and membrane technology [3,7]. However, each of these processes has certain limitations.…”

Section: Introductionmentioning

confidence: 99%

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Improving Formaldehyde Removal from Water and Wastewater by Fenton, Photo-Fenton and Ozonation/Fenton Processes through Optimization and Modeling

Hosseinzadeh

Najafpoor

Navaei

et al. 2021

Water

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This study aimed to assess, optimize and model the efficiencies of Fenton, photo-Fenton and ozonation/Fenton processes in formaldehyde elimination from water and wastewater using the response surface methodology (RSM) and artificial neural network (ANN). A sensitivity analysis was used to determine the importance of the independent variables. The influences of different variables, including H2O2 concentration, initial formaldehyde concentration, Fe dosage, pH, contact time, UV and ozonation, on formaldehyde removal efficiency were studied. The optimized Fenton process demonstrated 75% formaldehyde removal from water. The best performance with 80% formaldehyde removal from wastewater was achieved using the combined ozonation/Fenton process. The developed ANN model demonstrated better adequacy and goodness of fit with a R2 of 0.9454 than the RSM model with a R2 of 0. 9186. The sensitivity analysis showed pH as the most important factor (31%) affecting the Fenton process, followed by the H2O2 concentration (23%), Fe dosage (21%), contact time (14%) and formaldehyde concentration (12%). The findings demonstrated that these treatment processes and models are important tools for formaldehyde elimination from wastewater.

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Section: Optimization Of Different Fenton Processes In Formaldehyde Removalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Improving Formaldehyde Removal from Water and Wastewater by Fenton, Photo-Fenton and Ozonation/Fenton Processes through Optimization and Modeling

Hosseinzadeh

Najafpoor

Navaei

et al. 2021

Water

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“…Bioreactors play a crucial role in the biodegradation of wastewater. Studies have shown that formaldehyde is biodegradable under both aerobic and anaerobic conditions (7,9,13,14). Anaerobic microorganisms are more sensitive to formaldehyde than aerobic microorganisms, due to the formation of intermediates such as formic acid and methanol and the presence of significant amounts of COD in the effluent of anaerobic processes.…”

mentioning

confidence: 99%

Enhanced Biodegradation of Formaldehyde Using Aerobic Sequencing Batch Rotating Bed Bioreactor With and Without Stimulation by Hydrogen Peroxide

Yazdanbakhsh

Sadani

Golaki

2022

Avicenna J Environ Health Eng

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The removal of formaldehyde as a toxic substance from aqueous solutions is of particular importance. In this research, a sequencing batch rotating-bed bioreactor (SBRB) was used on a laboratory scale for biodegradation of formaldehyde from synthetic wastewater. The reactor was made of plexiglas with a cylindrical shape. Kaldnes media were placed in a rotating cylindrical basket in the reactor. The effects of formaldehyde concentration (500–1500 mg/L), hydraulic retention time (HRT) (8, 15, 24 hours), and injection of hydrogen peroxide (0.1-0.5 mM) on the performance of the reactor were investigated. The results showed that in the SBRB, at an HRT of 24 hours and an inlet formaldehyde concentration of 1000 mg/L, the removal efficiencies of formaldehyde and chemical oxygen demand (COD) were 99.2% and 92%, respectively, while without rotating the bed, the removal efficiency of formaldehyde and COD was found to be 95% and 83%, respectively. By adding hydrogen peroxide at a concentration of 0.3 mM and operation of the SBRB with an HRT of 8 hours and an inlet formaldehyde concentration of 1000 mg/L, an improvement in the removal efficiency of formaldehyde and COD (4% and 22%, respectively) was observed. Accordingly, SBRB stimulation with hydrogen peroxide could be considered as a high-performance process for the removal of formaldehyde and corresponding COD at a short HRT.

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Acicular Nickel on Carbon Nanofiber as Electrochemical Sensor Electrode for the Rapid Detection of Aqueous and Gaseous Formaldehyde at Room Temperature

2022

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The rapid and straightforward detection of formaldehyde (FA) in the environment is crucial for preventing the accidental inhalation of FA and limiting skin exposure to FA. In this study, we developed a simple nickel-based electrocatalytic electrode on carbon nanofibers (CNFsÀ Ni), which is suitable for rapidly detecting FA at room temperature. Centrifugal electrospinning was used to obtain polyacrylonitrile (PAN) nanofibers, which was subsequently stabilized and carbonized to fabricate the CNFs. Carbonization of the CNFs occurred at various temperatures (T c = 1200, 1300, 1400, and 1500 °C). PAN CNFs served as a highly conductive template for electroless plating under a magnetic field of 500 G to grow acicular nickel. The amperometric responses of the CNFsÀ Ni to aqueous FA were then measured. A lab-built amperometric gas sensor (CNFsÀ Ni 1-8), which comprised CNFs with a reduced Ni loading, was used as the electrode for detecting gaseous FA. Scanning electron microscopy (SEM), linear sweep voltammetry (LSV), cyclic voltammetry (CV), and chronoamperometry were used to evaluate the sensitivities of the electrodes. Within the linear range of 0.05-91.5 mM, the CNFs1400-Ni electrode was highly sensitive for detecting aqueous FA (2592 μA mM À 1 cm À 2 ), as evidenced by the fast response time (6 s). At a low concentration of gaseous FA (0.5 ppm), the laboratory-built FA gas sensor was stable (98.3 %) and had a fast response time (5 s) after 9 h of continuous operation.

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Treatment of formaldehyde wastewater by a membrane-aerated biofilm reactor (MABR): The degradation of formaldehyde in the presence of the cosubstrate methanol

Cited by 70 publications

References 49 publications

Improving Formaldehyde Removal from Water and Wastewater by Fenton, Photo-Fenton and Ozonation/Fenton Processes through Optimization and Modeling

Improving Formaldehyde Removal from Water and Wastewater by Fenton, Photo-Fenton and Ozonation/Fenton Processes through Optimization and Modeling

Enhanced Biodegradation of Formaldehyde Using Aerobic Sequencing Batch Rotating Bed Bioreactor With and Without Stimulation by Hydrogen Peroxide

Acicular Nickel on Carbon Nanofiber as Electrochemical Sensor Electrode for the Rapid Detection of Aqueous and Gaseous Formaldehyde at Room Temperature

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