Treatment of refractory organics from membrane rejects using ozonation

Pophali, Girish R.; Hedau, S.; Neti, Nageswara Rao; Rao, N. Nageswara; Nandy, Tapas

doi:10.1016/j.jhazmat.2011.02.030

Cited by 30 publications

(11 citation statements)

References 25 publications

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“…The disposal of diluted concentrates could severely affect the sensitive species of environment due to the refractory nature of organic pollutants present in concentrate (Meneses et al 2010). There are other alternative methods of disposal of RO concentrate are being studied and reported, such as ozonation (Pophali et al 2011), heterogeneous photocatalysis (UV/ TiO 2 ) (Westerhoff et al 2009;Mehmet et al 2014a, b;Muhammad et al 2015), sonolysis (Zhou et al 2011a, b;Muneer et al 2015). Recently, electrochemical advanced oxidation processes (EAOPs) have attracted considerable interests for the refractory organic removal from wastewater due to their simplicity and high efficiency by hydroxyl radical production (Hege et al 2004;Dialynas et al 2008;Perez et al 2010;Chaplin et al 2010;Zhou et al 2011a, b;Boopathy and Sekaran 2014;Necip et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Advanced oxidation of catechol in reverse osmosis concentrate generated in leather wastewater by Cu–graphite electrode

Maharaja

Boopathy

Karthikeyan

et al. 2016

Int. J. Environ. Sci. Technol.

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Reverse osmosis (RO) concentrate generated from tannery was treated by advanced electrochemical oxidation using graphite electrodes. Catechol was selected as model organic pollutant in the RO concentrate. The influence of applied current density, catechol concentration, pH, temperature and inner electrode space of electrodes was investigated in electrochemical oxidation system. The optimized conditions were found to be current density (j), 100 mA/cm 2 ; electrolysis time (t eco ), 60 min; pH, 7.0; and temperature, 25°C at an inner electrode space, 2 cm. The average mass transport coefficient for the removal of catechol as COD was found to be 3.0 9 10 -5 m/s at optimum conditions. Faradic efficiency and specific energy consumption were also calculated for the applied current density. Further, the treatment of catechol was confirmed through Fourier transform infrared spectroscopy. Theoretical evaluation of current density suggested that the removal of catechol was controlled when supplied at above limiting applied current densities and mass transport controlled at lower of limiting current densities.

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Section: Introductionmentioning

confidence: 99%

Advanced oxidation of catechol in reverse osmosis concentrate generated in leather wastewater by Cu–graphite electrode

Maharaja

Boopathy

Karthikeyan

et al. 2016

Int. J. Environ. Sci. Technol.

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“…This method has been successfully combined with ceramic membrane filtration process for more effective treatment of industrial complex wastewaters and efficient removal of organic toxics. Majority of investigations has been applied ozonation either as pre-treatment stage for removal of toxic organics prior to the membrane filtration step [230,231]or post-treatment stage to treat both permeate and retentate [232][233][234][235][236][237]. Photocatalytic membrane reactor with immersed UV-A lamps (reproduced from [249] with permission from the Chemical Engineering Journal)…”

Section: Mining Industrymentioning

confidence: 99%

The application of pressure-driven ceramic membrane technology for the treatment of industrial wastewaters – A review

Samaei

Gato-Trinidad

Altaee

2018

Separation and Purification Technology

275

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This paper presents a review of the previous laboratory analysis and case studies on the application of the pressure-driven ceramic membrane technology for treatment of industrial wastewaters. Ceramic membranes has attracted remarkable interests in recent decades for industrial wastewater treatment because of their superior characteristic such as high fluxes , reliable working lifetime under aggressive operating conditions and ease of cleaning. The literature review revealed that the efficiency of this technology has been proven in a wide variety of wastewaters from different industries and activities including pulp and paper, textile, pharmaceutical, petrochemical, food and mining. However, there are still challenges and questions for this technology that need to be addressed in future researches such as investment cost optimisation by introducing new fabrication technologies, selectivity, permeability and packing densities improvement, fouling minimisation and proposing scale up based on experimental research results.

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“…at high rates [16,17]. The ozonation was also widely studied for organic aromatic pollutant degradation from wastewater [18][19][20][21][22][23]. Recently, we reported degradation of refractory organics from reverse osmosis (RO) and nanofiltration (NF) rejects of tannery industry using ozonation method [23].…”

Section: Introductionmentioning

confidence: 99%

Treatment of Recalcitrant Caprolactam Wastewater Using Electrooxidation and Ozonation

Neti

Kashyap

2013

CLEAN Soil Air Water

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Advanced oxidation processes (AOPs) for the degradation of recalcitrant wastewater are of interest due to field application potential. We attempted the treatment of caprolactam (CL) wastewater which is highly acidic (pH 3.1) with low biodegradability index, using AOPs viz. electrochemical oxidation (EO) and ozonation. EO experiments under recirculation batch mode (20 mL min−1) in a three‐dimensional carbon bed reactor confirmed 18% chemical oxygen demand (COD) reduction. The first order rate constant for the EO of CL wastewater was estimated as 1.38 ± 0.15 × 10−2 min−1. The apparent Faradic efficiency and specific energy consumption were found to be 9.4% and 2.75 kWh kg−1 COD, respectively. Similarly, 27% COD and 26% total organic carbon were removed during 4‐h ozonation. Various organic compounds present in the raw and ozone treated effluent have been identified using GC‐MS; while many degraded partially, CL persisted even in 10‐h reacted samples. Both EO and ozonation methods are insufficient for the degradation of highly non‐biodegradable complex wastewater.

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Treatment of refractory organics from membrane rejects using ozonation

Cited by 30 publications

References 25 publications

Advanced oxidation of catechol in reverse osmosis concentrate generated in leather wastewater by Cu–graphite electrode

Advanced oxidation of catechol in reverse osmosis concentrate generated in leather wastewater by Cu–graphite electrode

The application of pressure-driven ceramic membrane technology for the treatment of industrial wastewaters – A review

Treatment of Recalcitrant Caprolactam Wastewater Using Electrooxidation and Ozonation

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