Treatment of Recalcitrant Caprolactam Wastewater Using Electrooxidation and Ozonation

Neti, Nageswara Rao; Kashyap, Sanjay M.

doi:10.1002/clen.201300177

Cited by 12 publications

(4 citation statements)

References 36 publications

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“…Advanced oxidation processes (AOPs) involve the production of strongly oxidizing hydroxyl radicals (·OH) and have been recommended as efficient technologies for water purification, with many of them based on ozone (O 3 ) and electrolysis application (Gedam et al 2014;Hermosilla et al 2015). Ozone is a superior oxidant that can directly oxidize organic compounds or can produce ·OH which are further used to react with the target contaminants.…”

Section: Introductionmentioning

confidence: 99%

Enhanced hydroxyl radical generation in the combined ozonation and electrolysis process using carbon nanotubes containing gas diffusion cathode

Zhang

et al. 2015

Environ Sci Pollut Res

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Combination of ozone together with electrolysis (ozone-electrolysis) is a promising wastewater treatment technology. This work investigated the potential use of carbon nanotube (CNT)-based gas diffusion cathode (GDC) for ozone-electrolysis process employing hydroxyl radicals (·OH) production as an indicator. Compared with conventional active carbon (AC)-polytetrafluoroethylene (PTFE) and carbon black (CB)-PTFE cathodes, the production of ·OH in the coupled process was improved using CNTs-PTFE GDC. Appropriate addition of acetylene black (AB) and pore-forming agent Na2SO4 could enhance the efficiency of CNTs-PTFE GDC. The optimum GDC composition was obtained by response surface methodology (RSM) analysis and was determined as CNTs 31.2 wt%, PTFE 60.6 wt%, AB 3.5 wt%, and Na2SO4 4.7 wt%. Moreover, the optimized CNT-based GDC exhibited much more effective than traditional Ti and graphite cathodes in Acid Orange 7 (AO7) mineralization and possessed the desirable stability without performance decay after ten times reaction. The comparison tests revealed that peroxone reaction was the main pathway of ·OH production in the present system, and cathodic reduction of ozone could significantly promote ·OH generation. These results suggested that application of CNT-based GDC offers considerable advantages in ozone-electrolysis of organic wastewater.

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Section: Introductionmentioning

confidence: 99%

Enhanced hydroxyl radical generation in the combined ozonation and electrolysis process using carbon nanotubes containing gas diffusion cathode

Zhang

et al. 2015

Environ Sci Pollut Res

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“…However, a lot of organic wastewater will be produced in the production process. What´s worse, the wastewater contains various high concentration organic compounds, such as cyclohexanone, cyclohexane, benzene, toluene, cyclohexanone oxime, organic acid and caprolactam, which impart high chemical oxygen demand (COD) and toxicity [3]. Hence, the treatment of this wastewater is difficult.…”

Section: Introductionmentioning

confidence: 99%

Development of a cost-effective wastewater treatment process: combination of different process

Jin

2021

E3S Web Conf.

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Caprolactam wastewater produced by the production process of caprolactam is characterized by a very high toxicity and chemical oxygen demand (COD) values, having potential harm to the environment if treated improperly. However, these characteristics make caprolactam wastewaters difficult to treat using traditional methods. So the aim of this work was to develop a cost-effective caprolactam wastewater treatment process. Fenton oxidation, sequencing batch reactor activated sludge process (SBR) and electro-catalytic oxidation were proposed to treat caprolactam wastewater in the laboratory scale, and the treatment effects were investigated. Compared with Fenton oxidation, SBR and electro-catalytic oxidation can treat caprolactam wastewater at a lower cost and more efficiently. The pilot test results indicate that the COD can be decreased to less than 1000 mg/L by the combination process, and when the COD removal rates maintain 90%, the cost of caprolactam wastewater treatment is below 6 yuan/m3. The combination process showed better economic benefit.

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“…Biological and chemical methods have been applied to treat WCP [12][13][14]. Chemical methodologies such as electrooxidation, ozonation [13] and biochemical techniques, such Appl. Sci.…”

Section: Introductionmentioning

confidence: 99%

Effects of Caprolactam Wastewater on Algal Growth and Nutrients Removal by Arthrospira platensis

Wang

et al. 2021

Applied Sciences

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Caprolactam wastewater (WCP), which is generated during the production of caprolactam, contains high contents of NO3− and inorganic P and is considered to be difficult to treat. In this study, Arthrospira platensis was used to remove N and P from WCP. Culture conditions and wastewater addition were optimized to relieve the inhibition effects of WCP. The results show that A. platensis growth and photosynthetic activity were inhibited depending on WCP concentrations. The inhibition rates were enhanced as the culture time increased under batch mode. However, the fed-batch mode significantly minimized the negative impact on A. platensis, which is beneficial for removing N and P from WCP by Arthrospira. After 10 d of cultivation of A. platensis in a 25 L circular photobioreactor in fed-batch addition of WCP (1.25% mixed WCP (v/v) each day), the average biomass productivity reached 17.48 g/(m2·d), the maximum protein content was 69.93%, and the N and P removal ratios were 100%. The accumulation effect of WCP inhibition on algal growth was not observed under this culture condition. Fed-batch cultivation of A. platensis is a promising way for bioremediation of WCP with high N and P removal efficiencies and high value-added biomass production.

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Treatment of Recalcitrant Caprolactam Wastewater Using Electrooxidation and Ozonation

Cited by 12 publications

References 36 publications

Enhanced hydroxyl radical generation in the combined ozonation and electrolysis process using carbon nanotubes containing gas diffusion cathode

Enhanced hydroxyl radical generation in the combined ozonation and electrolysis process using carbon nanotubes containing gas diffusion cathode

Development of a cost-effective wastewater treatment process: combination of different process

Effects of Caprolactam Wastewater on Algal Growth and Nutrients Removal by Arthrospira platensis

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