Degradation of 3,3′-iminobis-propanenitrile in aqueous solution by Fe0/GAC micro-electrolysis system

Lai, Bo; Zhou, Yuexi; Yang, Ping; Yang, Jing‐hui; Wang, Juling

doi:10.1016/j.chemosphere.2012.09.040

Cited by 132 publications

(42 citation statements)

References 17 publications

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“…In an Fe 0 /AC system, when iron (anode) and activated carbon (cathode) particles are mixed and contacted with each other, massive microscopic galvanic cells will be formed spontaneously between these two electrodes [18,22].…”

Section: Introductionmentioning

confidence: 99%

Mechanism of enhanced nitrate reduction via micro-electrolysis at the powdered zero-valent iron/activated carbon interface

Luo

Song

Liu

et al. 2014

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 99%

Mechanism of enhanced nitrate reduction via micro-electrolysis at the powdered zero-valent iron/activated carbon interface

Luo

Song

Liu

et al. 2014

Journal of Colloid and Interface Science

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“…Therefore, a simple and low-energy consumption technology that could improve the biodegradability of raw water is needed. Enhanced-ZVI has been successfully used to improve the removal of various refractory contaminants in wastewater treatment (Chen et al, 2012;Lai et al, 2013;Ruan et al, 2010;Song and Gao, 2014;Ying et al, 2012). However, no evaluation has been conducted to determine the performance of enhanced-ZVI or the synergy between enhanced-ZVI and biofiltration in the context of NOM removal during drinking water production.…”

Section: Conclusion Of Literature Review and Research Gaps 241 Resementioning

confidence: 99%

Section: Application Of Enhanced Zvimentioning

confidence: 99%

“…For enhanced-ZVI, iron is an anodic metal to provide electrons, meanwhile, carbon particles are used as a cathode to form a variety of microscopic galvanic cells in contact with iron particles, increasing the current efficiency significantly (Lai et al, 2013). Therefore, the performance of enhanced-ZVI would be influenced by the number of cathodes and in turn the ratio of iron to carbon particles (Lai et al, 2013). Initial pH affected enhanced-ZVI by influencing Fenton process, including the iron speciation, H 2 O 2 decomposition rate, and the efficiency of Fenton process (Cheng et al, 2007;Pignatello et al, 2006).…”

Section: Application Of Enhanced Zvimentioning

confidence: 99%

“…To date, GAC-based enhanced-ZVI process was mainly used to treat highly polluted wastewater, whereby the dissolved pollutants should ultimately be the primary electron acceptor (Lai et al, 2013;Ruan et al, 2010;Ying et al, 2012). From a technology point-of-view, the application in concentrated wastewater is very different compared to drinking water, which has a rather dilute nature.…”

Section: Introductionmentioning

confidence: 99%

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Novel chemical and biological pre-treatments to improve water quality in drinking water treatment

Liu¹

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Natural organic matter (NOM) is ubiquitous in surface water and the reactions between NOM and free chlorine can generate undesired disinfection by-products (DBPs). Therefore, an adequate degree of NOM removal is important for drinking water treatment plants (WTPs). Recently, the long-established approach of biofiltration applied as pre-treatment, including riverbank filtration (RBF) and slow sand filtration (SSL), has attracted attention for its relatively low cost and reliable performance in improving the quality of surface waters. Thus, the overall aim of this thesis is to gain in-depth understanding of NOM and DBP precursors removal during the biofiltration process and to develop approaches to improve the performance of the biofiltration.Firstly, a novel enhanced zero valent iron (ZVI) process that employs granular activated carbon as interspersed cathodes was evaluated as a pre-treatment step in drinking water production to remove NOM. Lab-scale batch tests indicated that, in the GAC enhanced-ZVI process, dissolved organic carbon (DOC) and ultraviolet absorbance at 254 nm (UV 254 ) were reduced by 61±3% and 70±2%, respectively, during 24 h treatment corresponding to 1.8 minutes empty bed contact time (EBCT).This process was superior to ZVI alone, GAC alone, and the sum of ZVI alone and GAC alone, confirming the synergic mechanism leading to increased iron dissolution rate. The dominant mechanism in terms of NOM removal during enhanced-ZVI was found to be coagulation following iron dissolution, while oxidation was occurring to a lesser degree, converting some nonbiodegradable into biodegradable DOC (BDOC). Therefore, the enhanced-ZVI process has the potential to improve biodegradation in a subsequent biofiltration step.Then, the long-term performance of the enhanced-ZVI process and its synergy with the subsequent biofiltration were investigated. Lab-scale flow-through experiments showed that, after 10,000-bed volumes, the enhanced-ZVI bed became passivated. However, sulphuric acid was able to regenerate the passivated enhanced-ZVI bed, recover the capacity of enhanced-ZVI in removing NOM, and hence make the best use of the available ZVI. The acidic rinsing solution containing dissolved iron was suitable as a supplemental source of iron for coagulation. In addition, during the long-term experiments, the biofilters (6 mins EBCT) following enhanced-ZVI (1.8 mins EBCT) removed more NOM than biofilters without any pre-treatment. This could be explained by the formation of BDOC during the enhanced-ZVI process and the precipitation of iron in the biofilters. Based on these findings, a novel water treatment train, incorporating enhanced-ZVI with periodical regeneration, biofiltration, and coagulation/filtration, was proposed and evaluated.ii Lab-scale biofiltration experiments (with 6 days hydraulic retention time (HRT)) were conducted with raw water from a water treatment plant, and the results showed that biodegradation is the main NOM removal mechanism for biofiltration. With the consumption of dissolved o...

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Application of Nanoscale Zero‐Valent Iron‐Loaded Natural Zeolite for Tetracycline Removal Process

et al. 2020

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Immobilized nanoscale zero‐valent iron on natural zeolite (NI‐NZ) was synthesized for remediation of antibiotics‐contaminated wastewater. A series of characterization methods confirmed the success of preventing the agglomeration of nanoscale zero‐valent iron particles, using natural zeolite as supporting media. The equilibrium data fitted well with the Langmuir and Temkin models, whereas the pseudo‐second‐order and Elovich kinetic models were suitable to describe the kinetic data. The versatility of NI‐NZ was also tested in a coagulation‐flocculation process which increased the removal of tetracycline from 10 to 75 %.

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Degradation of 3,3′-iminobis-propanenitrile in aqueous solution by Fe0/GAC micro-electrolysis system

Cited by 132 publications

References 17 publications

Mechanism of enhanced nitrate reduction via micro-electrolysis at the powdered zero-valent iron/activated carbon interface

Mechanism of enhanced nitrate reduction via micro-electrolysis at the powdered zero-valent iron/activated carbon interface

Novel chemical and biological pre-treatments to improve water quality in drinking water treatment

Application of Nanoscale Zero‐Valent Iron‐Loaded Natural Zeolite for Tetracycline Removal Process

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