Development and validation of a simulation model to determine the reaction rate constant of chlorine disinfection process at a wastewater treatment plant

作者：Demir Feridun^*

来源：Desalination and Water Treatment, 2016, 57(19): 8696-8704.

DOI：10.1080/19443994.2015.1023850

• Chlorine disinfection
• Reaction kinetics
• Modeling and simulation
• Model validation
• Parameter estimation
• Wastewater treatment

Chlorine disinfection of wastewater was investigated to determine the reaction rate constant of the disinfection process at the Kanapaha Water Reclamation Facility in Gainesville, FL. Chlorine reactions with wastewater occurred in the contact basin, and they could be characterized by partial differential equations (PDEs). In addition to the difficulties of the solution of these PDEs, the determination of the reaction rate constant of chlorine disinfection is also difficult because of complex reactions with ammonia and the dynamic behavior of wastewater. These vary depending on the influent ammonia concentration, chlorine dosage, and wastewater content and flow rate. A method of characteristics and an odometric transformation technique were applied to these equations to more easily obtain a solution. The method of characteristics is a mathematical solution technique that transforms a PDE into an ordinary differential equation (ODE). Because the disinfection reaction also has a large and variable time delay, the odometric transformation technique was introduced to eliminate this obstacle. The application of these mathematical solution and transformation techniques converted the dynamics of the system into a constant time-delay model and a set of ODEs. To validate the model and determine the reaction rate constant by simulation, the resulting equations were coded in Matlab and solved numerically. The validation was performed by a comparison of the simulated response of the developed model with the experimental data using Matlab software packages. The validation criterion was the obtainment of the highest fit (%) for the simulated result. The simulation results revealed that the fit (%) was the highest when the reaction rate constant was 0.0074h(-1).

• 出版日期2016-4-20