Kinetics of catalytic treatment of coking wastewater (COD, phenol and cyanide) using wet air oxidation

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Vibha Verma ◽  
Prabir Ghosh ◽  
Santosh Bahadur Singh ◽  
Vandana Gupta ◽  
Parmesh Kumar Chaudhari
Keyword(s):  
Treatment Time ◽  
Copper Chloride ◽  
Coking Wastewater ◽  
Air Oxidation ◽  
Wet Air Oxidation ◽  
Batch Mode ◽  
Initial Ph ◽  
Catalytic Treatment ◽  
Kinetics Of ◽  
Degradation Of Pollutants

Abstract Coking wastewater (CWW) is known as a highly polluting effluent. This study deals with the degradation of pollutants in terms of COD, phenol and cyanide present in CWW using catalytic wet air oxidation (CWAO) process. CWAO was carried out in batch mode using various catalysts. The investigated operating parameters are initial pH (pH i ) 3–11, temperature (T) 100–160 °C, air partial pressure (p air) 2–6 MPa, catalyst mass loading (C w ) 2–5 g/L and treatment time (t R ) of 0–6 h. Among various catalysts, the copper chloride was proved to be best for degradation of pollutants. The optimum conditions were evaluated for the degradation of organic compounds as T 130 °C, p air 8.8 MPa, C w 3 g/L and t R  = 6 h. The maximum percentage reduction of COD, phenol, and cyanide was achieved through experiment at T 160 °C, p air 12.2 MPa, C w 5 g/L and t R 6 h as 97.32%, 97.94% and 99.87%, respectively. The kinetics studies were also performed to evaluate the rate constant (k), and reaction order with respect to COD, phenol, CN, CW and p air.

Research on Oxidation Methods for Coking Wastewater Treatment

2014 ◽  
Vol 926-930 ◽  
pp. 4320-4323
Author(s):  
Kun Huang ◽  
Bing Xin Du ◽  
Jia Yu Zhang
Keyword(s):  
Wastewater Treatment ◽  
Electrochemical Oxidation ◽  
Chemical Oxidation ◽  
Development Prospect ◽  
Coking Wastewater ◽  
Air Oxidation ◽  
Wet Air Oxidation ◽  
Complex Composition ◽  
Refractory Organics

Coking wastewater treatment has a complex composition and the properties of high content of refractory organics and poor biodegradability. Coking wastewater treatment based on oxidation technique has drawn a lot of attention because of its advantages. Various common oxidation methods are reviewed in this research, such as wet air oxidation, chemical oxidation, ozonation and electrochemical oxidation. The development prospect of coking wastewater treatment based on oxidation methods is analyzed.

scholarly journals Studying the Phenol Degradation in Synthetic Wastewater by Catalytic Wet Air Oxidation Process in Batch Reactor

2018 ◽  
Vol 7 (4.20) ◽  
pp. 629
Author(s):  
Ghayda Yaseen AL Kindi ◽  
Faris Hammoodi AL Ani
Keyword(s):  
Batch Reactor ◽  
Phenol Degradation ◽  
Pillared Clay ◽  
Synthetic Wastewater ◽  
Air Oxidation ◽  
Wet Air Oxidation ◽  
Operation Condition ◽  
Optimum Proportion ◽  
Catalytic Kinetics ◽  
Kinetics Of

The current paper studies the viability of using a Batch reactor, by five types of Al-Fe pillared clay that prepared from five regions in Iraq for phenol degradation in synthetic wastewater. The operation condition study through variables in (pH, pressure, temperature, pillared load, phenol load). The findings have illustrated that phenol degradation could be increase via incrementing temperature, pressure, pillared load and degrease in phenol load. Phenol good degradation proportion which was 97 %, has been achieved at optimum proportion (pH= 3.9, temperature = 150 °C, pressure = 3.5 MPa, in addition to phenol concentration = 500 mg/l). The two models power-law and Langmuir−Hinshelwood have been used   to study the catalytic kinetics of the phenol degradation. From results shown the activation energy for every response equivalent to (37114.014 j/mol) for Anbar (37795, 48783.9, 36628, 40785 j/mol) for Erbil, Mosul, Baghdad and Basra respectively. It was proved that the reaction in this study is under kinetics control.   

scholarly journals Heteroatom (N, S) Co-Doped CNTs in the Phenol Oxidation by Catalytic Wet Air Oxidation

Catalysts ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 578
Author(s):  
Raquel P. Rocha ◽  
Olívia Salomé G. P. Soares ◽  
José J. M. Órfão ◽  
Manuel Fernando R. Pereira ◽  
José L. Figueiredo
Keyword(s):  
Catalytic Activity ◽  
Phenol Degradation ◽  
Textural Properties ◽  
Inert Atmosphere ◽  
Catalytic Wet Air Oxidation ◽  
Air Oxidation ◽  
Wet Air Oxidation ◽  
Batch Mode ◽  
Co Doping ◽  
Thermally Treated

The N, S-co-doping of commercial carbon nanotubes (CNTs) was performed by a solvent-free mechanothermal approach using thiourea. CNTs were mixed with the N, S-dual precursor in a ball-milling apparatus, and further thermally treated under inert atmosphere between 600 and 1000 °C. The influence of the temperature applied during the thermal procedure was investigated. Textural properties of the materials were not significantly affected either by the mechanical step or by the heating phase. Concerning surface chemistry, the developed methodology allowed the incorporation of N (up to 1.43%) and S (up to 1.3%), distributed by pyridinic (N6), pyrrolic (N5), and quaternary N (NQ) groups, and C–S–, C–S–O, and sulphate functionalities. Catalytic activities of the N, S-doped CNTs were evaluated for the catalytic wet air oxidation (CWAO) of phenol in a batch mode. Although the samples revealed a similar catalytic activity for phenol degradation, a higher total organic carbon removal (60%) was observed using the sample thermally treated at 900 °C. The improved catalytic activity of this sample was attributed to the presence of N6, NQ, and thiophenic groups. This sample was further tested in the oxidation of phenol under a continuous mode, at around 30% of conversion being achieved in the steady-state.

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