Mineralization of petrochemical wastewater after biological treatment by ozonation catalyzed with divalent iron tartaric acid chelate

Abstract The petrochemical wastewater includes many toxic organic compounds, which are refractory substances. It is difficult for the wastewater to meet discharge standards after biological treatment, therefore, the further effective treatment of post-biochemical petrochemical wastewater has become an urgent problem to be solved. This study used iron tartaric acid chelate (ITC) catalytic ozonation to treat the petrochemical wastewater. Various key factors were investigated, such as hydraulic retention time (HRT), catalyst dosage, ozone concentration, initial pH values and oxidation efficiency. The kinetics of catalytic ozonation were established. The results indicate that the chemical oxygen demand (COD) removal rate reached a maximum of 58.5%, when the Fe2+ dosage is 0.25 mmol L−1, the initial pH value is neutral, the liquid phase ozone concentration is about 1.95 mg L−1, and HRT is equal to 180 min. In addition, when HRT is equal to 90 min, the B/C ratio of wastewater increases to 0.31, the catalytic ozone reaches maximum oxidation efficiency, and the most economical HRT was 90 min. Finally, the kinetics of ITC catalytic ozonation catalyzed with ITC is consistent with the pseudo-first-order kinetic reaction, and its rate constant is 0.00484 min−1.

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H2O2-assisted photolysis of reactive dye BES golden yellow simulated wastewater

Water Science & Technology ◽

10.2166/wst.2009.670 ◽

2009 ◽

Vol 60 (9) ◽

pp. 2329-2336 ◽

Cited By ~ 2

Author(s):

Lv Jian-xiao ◽

Xie Guo-hong ◽

Yue Qing-ling ◽

Zhang Li ◽

Li Jian-min ◽

...

Keyword(s):

Reactive Dye ◽

Order Kinetic ◽

Yellow Solution ◽

Golden Yellow ◽

Optimum Ph ◽

Initial Ph ◽

Simulated Wastewater ◽

Kinetics Of ◽

H2o2 Addition ◽

Order Kinetic Equation

Reactive dye BES golden yellow simulated wastewater was treated with H2O2-assisted photolysis method. Influences of factors such as reaction time, initial pH and H2O2 dosage were investigated, and the reaction kinetics of the process were explored. Results showed that, the degradation of 200 mg/L BES golden yellow solution happened only in the presence of both conditions: UV irradiation and H2O2 addition. Initial pH and H2O2 dosage had remarkable influence on the removal efficiency of the dye. Through several groups of univariate experiments, the optimum pH and H2O2 dosage of the photolysis process were found to be 6–7 and 0.0375 mL 30% H2O2 per milligram of BES golden yellow, respectively. The photolysis process was approximately in accordance with the second-order kinetic equation.

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Kinetics of diatrizoate degradation by ozone and the formation of disinfection by-products in the sequential chlorination

Journal of Water Reuse and Desalination ◽

10.2166/wrd.2021.053 ◽

2021 ◽

Author(s):

Chen-Yan Hu ◽

Si-Cheng Ren ◽

Yi-Li Lin ◽

Ji-Chen Zhang ◽

Ye-Ye Zhu ◽

...

Keyword(s):

Ozone Concentration ◽

Ph Value ◽

Degradation Kinetics ◽

Order Rate Constant ◽

Order Kinetic ◽

Solution Ph ◽

First Order ◽

Pseudo First Order ◽

Kinetics Of ◽

By Products

Abstract In this study, we studied the degradation kinetics of a common iodine contrast agent, diatrizoate, by ozone and the formation of disinfection by-products (DBPs) in the sequential chlorination. Effects of ozone concentration, solution pH, and bromide concentration on diatrizoate degradation were evaluated. The results indicate that diatrizoate can be effectively degraded (over 80% within 1 h) by ozone, and the degradation kinetics can be well described using the pseudo-first-order kinetic model. The pseudo-first-order rate constant (kobs) of diatrizoate degradation significantly increased with increasing ozone concentration and decreasing bromide concentration. The kobs kept increasing with the increase of pH value and reached a maximum of 6.5 (±0.05) × 10−2 min−1 at pH 9. As the ozone concentration gradually increased from 0.342 to 1.316 mg/L, the corresponding kobs of diatrizoate degradation increased from 1.76 (±0.20) × 10−3 to 4.22 (±0.3) × 10−2 min−1. The bromide concentration exhibited a strong inhibitory effect on diatrizoate degradation because of the competition for ozone with diatrizoate. Trichloromethane was the only detected DBP in the subsequent chlorination in the absence of bromide. However, in the presence of bromide, six other DBPs were detected, and bromochloroiodomethane and tribromomethane became the major products with concentrations 1–2 orders higher than those of the other DBPs. In order to provide safe drinking water to the public, water should be maintained at circumneutral pH values and low bromine concentrations (<5 μM) before reaching the chlorine disinfection process to effectively control the formation of DBPs.

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Potential Biosorbent Derived fromCalligonum polygonoidesfor Removal of Methylene Blue Dye from Aqueous Solution

The Scientific World JOURNAL ◽

10.1155/2015/562693 ◽

2015 ◽

Vol 2015 ◽

pp. 1-11 ◽

Cited By ~ 14

Author(s):

Asma Nasrullah ◽

Hizbullah Khan ◽

Amir Sada Khan ◽

Zakaria Man ◽

Nawshad Muhammad ◽

...

Keyword(s):

Aqueous Solution ◽

Methylene Blue ◽

Particle Size ◽

Second Order ◽

Blue Dye ◽

Order Kinetic ◽

Particle Size Analyzer ◽

Initial Ph ◽

Pseudo Second Order ◽

Kinetics Of

The ash ofC. polygonoides(locally called balanza) was collected from Lakki Marwat, Khyber Pakhtunkhwa, Pakistan, and was utilized as biosorbent for methylene blue (MB) removal from aqueous solution. The ash was used as biosorbent without any physical or chemical treatment. The biosorbent was characterized by using various techniques such as Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). The particle size and surface area were measured using particle size analyzer and Brunauer-Emmett-Teller equation (BET), respectively. The SEM and BET results expressed that the adsorbent has porous nature. Effects of various conditions such as initial concentration of methylene blue (MB), initial pH, contact time, dosage of biosorbent, and stirring rate were also investigated for the adsorption process. The rate of the adsorption of MB on biomass sample was fast, and equilibrium has been achieved within 1 hour. The kinetics of MB adsorption on biosorbent was studied by pseudo-first- and pseudo-second-order kinetic models and the pseudo-second-order has better mathematical fit with correlation coefficient value (R2) of 0.999. The study revealed thatC. polygonoidesash proved to be an effective, alternative, inexpensive, and environmentally benign biosorbent for MB removal from aqueous solution.

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Decoloration of methylene blue simulated wastewater using a UV-H2O2 combined system

Journal of Water Reuse and Desalination ◽

10.2166/wrd.2011.019 ◽

2011 ◽

Vol 1 (1) ◽

pp. 45-51 ◽

Cited By ~ 10

Author(s):

L. V. Jian-xiao ◽

Cui Ying ◽

Xie Guo-hong ◽

Zhou Ling-yun ◽

Wang Su-fen

Keyword(s):

Methylene Blue ◽

Ph Value ◽

Order Kinetic ◽

Combined System ◽

Initial Stage ◽

Optimum Ph ◽

Initial Ph ◽

Simulated Wastewater ◽

Kinetics Of ◽

Order Kinetic Equation

Methylene blue simulated wastewater was treated with a UV-H2O2 combined system. Influences of factors such as reaction time, initial pH value and H2O2 dosage were investigated, and the reaction kinetics of the process was explored. Results showed that the degradation of methylene blue happened only in the presence of both conditions: UV irradiation and H2O2 addition. Initial pH and H2O2 dosage had a remarkable influence on the degradation efficiency. Through several groups of univariate experiments, the optimum pH and H2O2 dosage of the photolysis process were found to be 4–5 and 0.165 mL 30% H2O2 per milligram of methylene blue, respectively. The photolysis process was relatively fast at the initial stage and, 20 min later, it was approximately in accordance with the first-order kinetic equation.

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Decolorization Kinetics of Acid Azo Dye and Basic Thiazine Dye in Aqueous Solution by UV/H2O2 and UV/Fenton: Effects of Operational Parameters

Autex Research Journal ◽

10.1515/aut-2016-0031 ◽

2017 ◽

Vol 17 (1) ◽

pp. 85-94

Author(s):

Ayda Baffoun ◽

Amel El Ghali ◽

Imen Hachani

Keyword(s):

Order Kinetic ◽

Operational Parameters ◽

Operational Conditions ◽

First Order ◽

Aqueous Effluents ◽

Initial Ph ◽

Order Kinetic Model ◽

Thiazine Dye ◽

Kinetics Of ◽

Decolorization Kinetics

AbstractThe photochemical decolorization of two dyes, namely Acid Yellow 54 and Basic Blue 9, was studied using the UV/H2O2and UV/Fenton processes. The effects of the amount of H2O2and FeSO4as well as the initial pH solution on decolorization kinetics of both the dyes were investigated. The pseudo-first order kinetic model was applied to predict the decolorization of the selected dyes at the different operational conditions and results showed that this model fitted very well with the experimental data. The obtained results also showed the efficiency of UV/Fenton process to quickly degrade aqueous effluents polluted by Acid Yellow 54 and Basic Blue 9 compared to the UV/H2O2process.

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Kinetics of Pumice Catalyzed Ozonation of Trace p-Chloronitrobenzene in Aqueous Solution

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.90-93.2925 ◽

2011 ◽

Vol 90-93 ◽

pp. 2925-2928 ◽

Cited By ~ 1

Author(s):

Lei Yuan ◽

Ji Min Shen ◽

Zhong Lin Chen

Keyword(s):

Aqueous Solution ◽

Rate Constant ◽

Butyl Alcohol ◽

Order Kinetic ◽

First Order ◽

Highly Active ◽

Tert Butyl Alcohol ◽

Initial Ph ◽

Order Kinetic Model ◽

Kinetics Of

The kinetics of pumice for decomposition of p-chloronitrobenzene (pCNB) in aqueous solution were investigate. The experiment result indicated that ozonation alone and pumice-catalyzed ozonation of trace pCNB in aqueous solution followed the Pseudo-first-order kinetic model at the reaction temperature of 296 K and the initial pH of 6.86. The rate constant of pumice-catalyzed ozonation increase 149% compared with ozonation alone. In two processes mentioned above, the rate constants of degradation of pCNB were found to decrease with increasing of tert-butyl alcohol. The rate constant of ozonation alone appeared to be decreased 73%, respectively, decreasing 194% in the process of pumice-catalyzed ozonation. Under the conditions of this experiment, ozonation alone and pumice-catalyzed ozonation for degradation of pCNB were primarily oxidized by highly active hydroxyl radicals.

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Chitosan-based Magnetic Composites - Efficient Adsorbents for Removal of Pb(II) and Cu(II) from Aqueous Mono and Bicomponent Solutions

Revista de Chimie ◽

10.37358/rc.18.9.6527 ◽

2018 ◽

Vol 69 (9) ◽

pp. 2323-2330 ◽

Cited By ~ 1

Author(s):

Daniela C. Culita ◽

Claudia Maria Simonescu ◽

Rodica Elena Patescu ◽

Nicolae Stanica

Keyword(s):

Aqueous Solutions ◽

Metal Ions ◽

Chemical Properties ◽

Order Kinetic ◽

Mass Ratio ◽

Magnetic Adsorbent ◽

Magnetic Composites ◽

Initial Ph ◽

Order Kinetic Model ◽

Physical And Chemical

A series of three chitosan-based magnetic composites was prepared through a simple coprecipitation method. It was investigated the influence of mass ratio between chitosan and magnetite on the physical and chemical properties of the composites in order to establish the optimum conditions for obtaining a composite with good adsorption capacity for Pb(II) and Cu(II) from mono and bicomponent aqueous solutions. It was found that the microspheres prepared using mass ratio chitosan / magnetite 1.25/1, having a saturation magnetization of 15 emu g--1, are the best to be used as adsorbent for the metal ions. The influence of different parameters such as initial pH values, contact time, initial concentration of metal ions, on the adsorption of Pb(II) and Cu(II) onto the chitosan-based magnetic adsorbent was investigated in details. The adsorption process fits the pseudo-second-order kinetic model in both mono and bicomponent systems, and the maximum adsorption capacities calculated on the basis of the Langmuir model were 79.4 mg g--1 for Pb(II) and 48.5 mg g--1 for Cu(II) in monocomponent systems, while in bicomponent systems were 88.3 and 49.5 mg g--1, respectively. The results revealed that the as prepared chitosan-based magnetic adsorbent can be an effective and promising adsorbent for Pb(II) and Cu(II) from mono and bicomponent aqueous solutions.

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Study of color kinetics of banana (Musa cavendish) under microwave drying by application of image analysis

Food Science and Technology International ◽

10.1177/1082013220981334 ◽

2020 ◽

pp. 108201322098133

Author(s):

Sagar Nagvanshi ◽

Subbarao Kotra Venkata ◽

TK Goswami

Keyword(s):

Microwave Power ◽

Vision System ◽

Power Level ◽

Microwave Drying ◽

Slice Thickness ◽

Order Kinetic ◽

Drying Time ◽

Volumetric Heating ◽

Kinetics Of ◽

Microwave Power Level

Microwave drying works on the volumetric heating concept promoted by electromagnetic radiation at 0.915 or 2.450 GHz. In this study, banana ( Musa Cavendish) was taken as the sample and treated under microwave drying. The effect of two process variables, namely slice thickness (2, 3.5, and 5 mm) and microwave power (180 W, 360 W, and 540 W), were studied on drying kinetics and color kinetics. It was observed that the inverse variation relationship exists between drying time and microwave power level while drying time and slice thickness exhibited a direct variation relationship. A Computer Vision System (CVS) was developed to measure the color values of banana in CIELab space using an algorithm written in MATLAB software. Once the color parameters were obtained, they were fitted in First and Zero-order kinetic models. Both models were found to describe the color values adequately. This study concludes that microwave drying is a promising dehydration technique for banana drying that reduces the significant time of drying. Application of CVS is an excellent approach to measure the surface color of banana.

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Factors influencing the adsorption and photocatalysis of direct red 80 in the presence of a TiO2: Equilibrium and kinetics modeling

Journal of Chemical Research ◽

10.1177/1747519821989969 ◽

2021 ◽

pp. 174751982198996

Author(s):

Moussa Abbas

Keyword(s):

Elimination Rate ◽

Threshold Value ◽

Heterogeneous Photocatalysis ◽

Order Kinetic ◽

Batch Mode ◽

Adsorption Capacities ◽

Initial Ph ◽

Equilibrium And Kinetics ◽

Order Kinetic Model ◽

Charge Point

Among the different photocatalysts, TiO2 ( Eg = 3.1 eV, zero charge point (pHpzc = 6.3), and surface = 55 m2/g) is currently the most efficient and the most studied semiconductor due to its strong photocatalytic activity, non-toxicity, and chemical stability. The elimination of DR-80 on TiO2 is studied by adsorption in batch mode and by application of heterogeneous photocatalysis onto TiO2 under UV irradiation. The effects of contact time (0–60 min), initial pH (3–11), dose of the adsorbent (0.5–3 g L−1), and DR-80 concentration (40–60 mg L−1) on the adsorption of DR-80 by TiO2 are studied for optimization of these parameters. The kinetic parameters, rate constants, and equilibrium adsorption capacities are calculated and discussed for each applied theoretical model. The adsorption of DR-80 is well described by the pseudo-first-order kinetic model. The fitting of the adsorption isotherms shows that the models of Langmuir and Temkin offering a better fit and an adsorption 64.102 mg/g at 25 °C of DR-80 are eliminated. The results showed that the photocatalytic efficiency strongly depends on the pH while the initial rate of photodegradation is proportional to the catalyst dose, and becomes almost constant above a threshold value. It was found that the photodegradation is favored at low DR-80 concentrations in accordance with the Langmuir–Hinshelwood model with the constants Kad = 6.5274 L/mg and KL–H = 0.17818 mg L−1 min. However, the adsorption is improved for high DR-80 concentrations. It is found that the degradation depends on both the temperature and the pH with a high elimination rate at high temperature. The photocatalyst TiO2 has a better activity for the degradation of DR-80, compared to some commercial catalysts that have been described in the literature.

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Silica Removal from a Paper Mill Effluent by Adsorption on Pseudoboehmite and γ-Al2O3

Water ◽

10.3390/w13152031 ◽

2021 ◽

Vol 13 (15) ◽

pp. 2031

Author(s):

Ruben Miranda ◽

Isabel Latour ◽

Angeles Blanco

Keyword(s):

Paper Mill ◽

Ph Adjustment ◽

Paper Mill Effluent ◽

Kinetics Studies ◽

Silica Removal ◽

Industrial Water Use ◽

Optimum Ph ◽

Initial Ph ◽

Equilibrium And Kinetics ◽

Kinetics Of

Effluent reuse is a common practice for sustainable industrial water use. Salt removal is usually carried out by a combination of membrane processes with a final reverse osmosis (RO). However, the presence of silica limits the RO efficiency due to its high scaling potential and the difficulty of cleaning the fouled membranes. Silica adsorption has many advantages compared to coagulation and precipitation at high pHs: pH adjustment is not necessary, the conductivity of treated waters is not increased, and there is no sludge generation. Therefore, this study investigates the feasibility of using pseudoboehmite and its calcination product (γ-Al2O3) for silica adsorption from a paper mill effluent. The effect of sorbent dosage, pH, and temperature, including both equilibrium and kinetics studies, were studied. γ-Al2O3 was clearly more efficient than pseudoboehmite, with optimal dosages around 2.5–5 g/L vs. 7.5–15 g/L. The optimum pH is around 8.5–10, which fits well with the initial pH of the effluent. The kinetics of silica adsorption is fast, especially at high dosages and temperatures: 80–90% of the removable silica is removed in 1 h. At these conditions, silica removal is around 75–85% (<50 mg/L SiO2 in the treated water).

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