Modeling and design of anaerobic fluidized bed reactor with recycling for denitrification of reverse osmosis concentrates

Ersever, Ilknur ErseverI.; Ravindran, Varadarajan; Tsai, Huan-Hun; Pirbazari, Massoud

doi:10.1016/j.ces.2013.12.036

Cited by 28 publications

(8 citation statements)

References 17 publications

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“…The Crank–Nicholson grids were used for the advection‐diffusion equation. The hybrid scheme was implemented by using appropriate computational recipes encoded in Matlab version 7.2, the theoretical aspects of which are well explained by Pirbazari and coworkers …”

Section: Background Informationmentioning

confidence: 99%

Modeling and performance prediction of chromate reduction by iron oxide coated sand in adsorber reactors

2016

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Iron oxide coated sand (IOCS) as an adsorbent medium for removing hexavalent chromium (Cr(VI)) from industrial wastewater, as well as in permeable reactive barriers for remediation of Cr(VI) in aquifers is investigated in this study. An important feature was the use of a mathematical model for performance forecasting and process upscaling of IOCS fixed-bed adsorber systems for Cr(VI) removal. Another significance aspect was the elucidation of IOCS surface mechanisms and interactions responsible for Cr(VI) sorption and reduction to the less toxic Cr(III). The adsorption equilibrium and mass-transfer parameters for modeling were obtained from independent laboratory studies. Adsorber studies validated the predictive model and established the effectiveness of IOCS for Cr(VI) removal under different conditions. Model simulation studies demonstrated that adsorbent capacity, surface diffusion, and film transfer significantly influenced process dynamics. The study showed that IOCS can be used to remove Cr(VI) from contaminated waters, meeting the overall objectives of regulatory agencies. V C 2016 American Institute of Chemical Engineers AIChE J, 00: 000-000, 2016 Keywords: adsorption/liquid, diffusion (microporous), environmental engineering, mathematical modeling, mass transfer IntroductionThe removal of toxic contaminants from the scarce potable water sources is a major concern for public and private utilities. Hexavalent chromium or Cr(VI) is one such toxic contaminant found globally in aquifers owing to anthropogenic activities; and hence effective, efficient and economical technologies are essential for its removal from contaminated waters and industrial wastewaters to protect public health. Such technologies include chemical redox followed by precipitation, ion exchange, adsorption, and reverse osmosis; and most of them have serious drawbacks, although adsorption appears the most promising and reliable.1 A major challenge is the choice of an ideal adsorbent that not only possesses high sorption capacities for target pollutants, but also has amenability to regeneration. Activated carbons with high BrunauerEmmett-Teller (BET) surface areas are efficient in sorption of toxic metals; nevertheless, regeneration of spent carbons involves high temperatures and excessive energies. Adsorbents such as peat and sawdust are effective in chromium removal, 2,3 but are not amenable to regeneration. These factors have provided the impetus to synthesis of new materials with better capacity and regenerability.Iron oxide coated sand (IOCS) has been used as an efficient, versatile and cost-effective adsorbent for toxic metal removal in water treatment applications. 4,5 Iron oxide surfaces are physically and chemically heterogeneous, and its characteristics change with time, particularly its porosity and specific surface area. It has sufficient mesopores and high levels of micropores to facilitate penetration and sorption of ions at high capacities. 6 The adsorbent can reduce metal-bound organic or inorganic complexes typically poorly...

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Section: Background Informationmentioning

confidence: 99%

Modeling and performance prediction of chromate reduction by iron oxide coated sand in adsorber reactors

2016

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“…The growth of industrial activities increases obviously the pollution sources [1][2][3][4]. The textile industry is one of the industrial poles, it produces an enormous quantity of waste loaded with non-biodegradable dye stuffs [5][6][7][8]. These discharges contribute to the degradation of the quality of surface water and groundwater by their harmful and toxic side effects [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Degradation of Crystal Violet Using Ti/Pt/SnO2 Electrode

et al. 2021

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Today, organic wastes (paints, pigments, etc.) are considered to be a major concern for the pollution of aqueous environments. Therefore, it is essential to find new methods to solve this problem. This research was conducted to study the use of electrochemical processes to remove organic pollutants (e.g., crystal violet (CV)) from aqueous solutions. The galvanostatic electrolysis of CV by the use of Ti/Pt/SnO2 anode, were conducted in an electrochemical cell with 100 mL of solution using Na2SO4 and NaCl as supporting electrolyte, the effect of the important electrochemical parameters: current density (20–60 mA cm−2), CV concentration (10–50 mg L−1), sodium chloride concentration (0.01–0.1 g L−1) and initial pH (2 to 10) on the efficiency of the electrochemical process was evaluated and optimized. The electrochemical treatment process of CV was monitored by the UV-visible spectrometry and the chemical oxygen demand (COD). After only 120 min, in a 0.01mol L−1 NaCl solution with a current density of 50 mA cm−2 and a pH value of 7 containing 10 mg L−1 CV, the CV removal efficiency can reach 100%, the COD removal efficiency is up to 80%. The process can therefore be considered as a suitable process for removing CV from coloured wastewater in the textile industries.

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“…15,16 Biological methods have been widely accepted as highly effective and low-cost for organic contaminant removal and have drawn much attention in recent years. 17 Irrespective of whether they are used alone or combined with other technologies, they are a research-oriented direction for simultaneously reducing the chemical oxygen demand (COD) and total nitrogen. Xu et al 18 used a biological activated carbon process to treat reverse osmosis concentrate water in a renery.…”

Section: Introductionmentioning

confidence: 99%

Advanced treatment of coal chemical reverse osmosis concentrate with three-stage MABR

Liu

et al. 2020

RSC Adv.

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Modeling and design of anaerobic fluidized bed reactor with recycling for denitrification of reverse osmosis concentrates

Cited by 28 publications

References 17 publications

Modeling and performance prediction of chromate reduction by iron oxide coated sand in adsorber reactors

Modeling and performance prediction of chromate reduction by iron oxide coated sand in adsorber reactors

Electrochemical Degradation of Crystal Violet Using Ti/Pt/SnO2 Electrode

Advanced treatment of coal chemical reverse osmosis concentrate with three-stage MABR

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