Performance analysis of four-stage rotating biological contactor in nitrification and COD removal from petroleum refinery wastewater

Electrochemical oxidation (EO) investigated chemical oxygen demand (COD) subtraction from petroleum refinery wastewater (PRW) as a capable remediation process. Titanium substrates coated with iridium–tantalum oxide mixtures (Ti/IrO2–Ta2O5) were used as the dimensional stable anode (DSA). The Box-Behnken Design (BBD), a statistical experimental design and response surface methodology (RSM), was used to matrix the current density, temperature, and electrolyte (NaCl) concentration variables, with COD removal efficiency as the response factor. A second-order verifiable relationship between the response and independent variables was derived where the analysis of variance displayed a high coefficient of determination value (R2 = 0.9799). The predicted values calculated with the model equations were very close to the experimental values where the model was highly significant. Based on the BBD for current density, the optimum process conditions, temperature and electrolyte (NaCl) concentration were 7.5 mA/cm2, 42 °C and 4.5 g/L, respectively. They were resulting in a COD removal efficiency of 99.83% after a 12-hour EO period.

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Numerical Analysis of Petroleum Refinery Wastewater Treatment Using Electro-Fenton Process

Chemical Product and Process Modeling ◽

10.1515/cppm-2014-0020 ◽

2015 ◽

Vol 10 (1) ◽

pp. 11-16 ◽

Cited By ~ 4

Author(s):

Reza Davarnejad ◽

Masoud Pirhadi ◽

Mohsen Mohammadi ◽

Shahrzad Arpanahzadeh

Keyword(s):

Experimental Data ◽

Reaction Time ◽

Current Density ◽

Petroleum Refinery ◽

Simulated Data ◽

Cod Removal ◽

Molar Ratio ◽

Fenton Process ◽

Refinery Wastewater ◽

Petroleum Refinery Wastewater

Abstract The important parameters in mineralization treatment of petroleum refinery wastewater by electro-Fenton process were successfully simulated by Computational Fluid Dynamics (CFD). The effects of H2O2/PRW (ratio of mole of H2O2 per petroleum refinery wastewater volume), H2O2/Fe2+ molar ratio, current density, pH and reaction time were numerically investigated. Materials distribution in the electrochemical cell was studied and CFD results demonstrated that distance between electrodes had no significant effect on the Chemical oxygen demand (COD) removal. Furthermore, the results were compared with the experimental data. The simulated data showed that maximum COD removal was around 82.55% at H2O2/PRW of 0.04, H2O2/Fe2+ molar ratio of 2.75, pH of 3.5, current density of 52.5 mA/cm2 and reaction time of 90 min while the experimental data obtained from the literature showed maximum COD removal of 77% in the same operating conditions. The simulated data showed a good agreement with the experimental ones.

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Optimization and Control Petroleum Refinery Wastewater Treatment Systems — Status, Trends and Needs

Water Quality Research Journal ◽

10.2166/wqrj.1989.029 ◽

1989 ◽

Vol 24 (3) ◽

pp. 463-477

Author(s):

Stephen G. Nutt

Keyword(s):

Wastewater Treatment ◽

Process Control ◽

Petroleum Refinery ◽

Control Strategies ◽

Refinery Wastewater ◽

Statistical Process ◽

Petroleum Refinery Wastewater ◽

Optimization And Control ◽

And Control ◽

Wastewater Treatment Systems

Abstract Based on discussions in workshop sessions, several recurring themes became evident with respect to the optimization and control of petroleum refinery wastewater treatment systems to achieve effective removal of toxic contaminants. It was apparent that statistical process control (SPC) techniques are finding more widespread use and have been found to be effective. However, the implementation of real-time process control strategies in petroleum refinery wastewater treatment systems is in its infancy. Considerable effort will need to be expended to demonstrate the practicality of on-line sensors, and the utility of automated process control in petroleum refinery wastewater treatment systems. This paper provides a summary of the discussions held at the workshop.

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Online Instrumentation of Petroleum Refinery Wastewater Treatment Plants

Water Quality Research Journal ◽

10.2166/wqrj.1989.027 ◽

1989 ◽

Vol 24 (3) ◽

pp. 435-450 ◽

Cited By ~ 1

Author(s):

J.P. Stephenson

Keyword(s):

Wastewater Treatment ◽

Continuous Monitoring ◽

Wastewater Treatment Plants ◽

Petroleum Refinery ◽

Petroleum Industry ◽

Refinery Wastewater ◽

Analytical Instruments ◽

Petroleum Refinery Wastewater ◽

Sample Characterization ◽

Industry Wastewater

Abstract Several online analytical instruments are commercially available to allow continuous monitoring of petroleum industry wastewater treatment plants. Satisfactory usage of these instruments requires -special attention for sample preconditioning and sample characterization prior to selection. Specific examples of the available instruments are provided. Effective maintenance of instruments is emphasized.

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