Degradation of organic pollutants in near-neutral pH solution by Fe-C micro-electrolysis system

Yang, Zemeng; Ma, Yuepeng; Liu, Ying; Li, Qunsheng; Zhou, Zhiyong

doi:10.1016/j.cej.2017.01.042

Cited by 160 publications

(41 citation statements)

References 45 publications

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“…From these products, a possible degradation pathway of CI Direct Blue 15 dye could be deduced ( Figure 7 ). The degradation of the dye was mainly caused by the [H] and ·OH produced by the iron-carbon micro-electrolysis coupled with H 2 O 2 addition [ 40 ].…”

Section: Resultsmentioning

confidence: 99%

Degradation Characteristics of Color Index Direct Blue 15 Dye Using Iron-Carbon Micro-Electrolysis Coupled with H2O2

Yang

Gao

Yan

et al. 2018

IJERPH

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Currently, many industrial dyes are discharged into the environment in China, leading to serious water pollution. However, synthetic organic dyes in industrial effluents cannot be degraded by conventional wastewater treatment methods. Consequently, it is necessary to develop new environmentally friendly technologies to completely mineralize these non-biodegradable compounds. In this study, 300 mg/L typical Color Index (CI) Direct Blue 15 (benzidine disazo) in simulated dye wastewater was degraded by iron-carbon micro-electrolysis coupled with H2O2 to explore its decolorization, total organic carbon (TOC) removal rate, and degradation characteristics. Under the optimal degradation conditions (Fe/C = 2:1, pH = 3, 60-min reaction, 2 mL/L H2O2 (added in three aliquots), 300 mg/L dye), the TOC removal rate and the level of dye decolorization attained 40% and 98%, respectively. In addition, the degradation kinetics indicated that the iron-carbon micro-electrolysis process coupled with H2O2 followed first-order reaction kinetics. A degradation pathway for CI Direct Blue 15 was proposed based on the analysis results of treated wastewater obtained using UV-Vis spectrophotometry and gas chromatography–mass spectrometry (GC-MS). This study provides an efficient and economical system for the degradation of non-biodegradable pollutants.

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Section: Resultsmentioning

confidence: 99%

Degradation Characteristics of Color Index Direct Blue 15 Dye Using Iron-Carbon Micro-Electrolysis Coupled with H2O2

Yang

Gao

Yan

et al. 2018

IJERPH

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“…It can be seen that too large or too small an Fe/C ratio is detrimental to the treatment effect; when the Fe/C ratio is too small, there are fewer iron-carbon macro-primary cells, and too much activated carbon reduces the contact probability between the sewage and electrode reaction active products, decreasing the electrode reaction rate and resulting in a poor treatment effect. In addition, due to removal by activated carbon, too much activated carbon will inhibit the electrode for the primary battery reaction [44]. When the Fe/C ratio is too large, the number of macro primary batteries is insufficient, resulting in a reduction in the treatment effect.…”

Section: Effect Of Fe/c Ratio Of Nicls On Removal Capacitymentioning

confidence: 99%

Preparation of a New Iron-Carbon-Loaded Constructed Wetland Substrate and Enhanced Phosphorus Removal Performance

2020

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Iron-carbon substrates have attracted extensive attention in water treatment due to their excellent processing ability. The traditional iron-carbon substrate suffers from poor removal effects, separation of the cathode and anode, hardening, secondary pollution, etc. In this study, a new type of iron-carbon-loaded substrate (NICLS) was developed to solve the problems of traditional micro-electrolytic substrates. Through experimental research, a preparation method for the NICLS with Fe and C as the core, zeolite as the skeleton, and water-based polyurethane as the binder was proposed. The performance of the NICLS in phosphorus-containing wastewater was analyzed. The results are as follows: The optimal synthesis conditions of the NICLS are 1 g hydroxycellulose, wood activated carbon as the cathode, an activated carbon particle size of 200-60 mesh, and an Fe/C ratio of 1:1. Acidic conditions can promote the degradation of phosphorus by the NICLS. Through the characterization of the NICLS (scanning electron microscope (SEM), X-ray diffractometer (XRD), and energy-dispersive spectrometer (EDS), etc.), it is concluded that the mechanism of the NICLS phosphorus removal is a chemical reaction produced by micro-electrolysis. Using the NICLS to treat phosphorus-containing wastewater has the advantages of high efficiency and durability. Therefore, it can be considered that the NICLS is a promising material to remove phosphorus.

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“…Accordingly, the decomposed phenol is converted to a less toxic intermediate compound. The mechanism suggests that the transformation of toxic organic compounds into biodegradable intermediates is caused by the microelectrolysis, which produces radicals and oxidants to destroy benzene rings and chemical bonds situating at side chains [20]. On the other hand, based on the formation of an electric field that induces microelectron currents in the galvanic cell reaction, electron transfer effectively stimulates the growth of microorganisms and active metabolic enzymes and moreover, promotes the biodegradation of microorganisms [21].…”

Section: Wastewater Treatment Using Fe-c Internal Electrolysis Materialsmentioning

confidence: 99%

“…Changes in pH in the A2O-MBBR system reflect the metabolic capacity of the microorganism, the efficiency of pollutant consumption, the development, and the existence of specific microorganisms in reaction tanks [7,15,18,20]. The retention times in anaerobic, anaerobic, and aerobic treatment were 14, 6, and 4 h, respectively.…”

Section: Ph Change In the A2o-mbbr Systemmentioning

confidence: 99%

Enhanced Degradation of Phenolic Compounds in Coal Gasification Wastewater by Methods of Microelectrolysis Fe-C and Anaerobic-Anoxic—Oxic Moving Bed Biofilm Reactor (A2O-MBBR)

Hương

Nguyen

et al. 2020

Processes

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The coal gasification wastewater figures prominently among types of industrial effluents due to its complex and phenolic composition, posing great difficulty for conventional water treatment processes. Since the coking wastewater is toxic and mutagenic to humans and animals, treatment of coal gasification wastewater is genuinely necessary. In this study, we established a lab-scale A2O (Anaerobic-Anoxic—Oxic) with moving bed biological reactor (MBBR) system and evaluated some water indicators of wastewater pretreated with internal electrolysis, of wastewater output of the established A2O-MBBR system, and of the wastewater treated by the combination thereof. The wastewater was taken from a coking plant at Thai Nguyen Iron and Steel Joint Stock Company in Vietnam. COD, BOD5, NH4+-N, phenol, and pH of the input coal gasification wastewater were 2359, 1105, 319, 172 mg/L, and 8 ± 0.1, respectively. The conditions of internal electrolysis were as follows: 720 min of reaction time, pH = 4, 25 g/L Fe-C dosage, and 100 mg/L PAM dosage. After internal electrolysis process, the removal of COD, BOD5, NH4+-N, and phenol were 53.7%, 56.7% 60.5%, and 73.3%, respectively. After 24 h of treatment, the treatment efficiencies of the combined treatment process are as follows: 100% phenol removal, 71.3% of TSS removal; 97.7% reduction of BOD5, and 97.1% reduction of COD; total N content reduced by 97.6%; total P content decreased by 81.6%; and NH4+-N content decreased by 97.5%. All above indicators after treatment have met QCVN 52: 2017/BTNMT (column A) Vietnamese standard for steel industry wastewater.

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Degradation of organic pollutants in near-neutral pH solution by Fe-C micro-electrolysis system

Cited by 160 publications

References 45 publications

Degradation Characteristics of Color Index Direct Blue 15 Dye Using Iron-Carbon Micro-Electrolysis Coupled with H2O2

Degradation Characteristics of Color Index Direct Blue 15 Dye Using Iron-Carbon Micro-Electrolysis Coupled with H2O2

Preparation of a New Iron-Carbon-Loaded Constructed Wetland Substrate and Enhanced Phosphorus Removal Performance

Enhanced Degradation of Phenolic Compounds in Coal Gasification Wastewater by Methods of Microelectrolysis Fe-C and Anaerobic-Anoxic—Oxic Moving Bed Biofilm Reactor (A2O-MBBR)

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