Modeling some biological processes of MBBR technology applying for treatment of landfill leachate

Abstract

ABSTRACT

The research has built a mathematical model to simulate some biological processes taking place in the MBBR (Moving Bed Biofilme Reactor) system, which focuses on the COD removal and nitrogen treatment processes in landfill leachate. The study was carried out on the basis of developing mathematical equations used to describe activated sludge processes and biofilm biofilm processes based on the principles of ASM 1 and ASM 3 (Active Sludge Model) and ASM 3 (Active Sludge Model) and actual conditions of landfill leachate in Vietnam. The system of obtained equations represents the participation of 15 components in 19 biological processes occurring in the leachate treatment system by AO-MBBR technology. The system of equations is numerically solved by the 4th order Runge-Kutta algorithm and numerically coded in the Matlab programming language. The study also determined the local sensitivity to calibrate to give the kinematic parameters suitable for the actual conditions in Vietnam. The calculated results of the model have been compared with experimental data sets, showing low errors, especially with long time points such as 33 hours, 48 hours, with errors ranging from 0.26% -0.29 % for COD and 1.53% -3.26% for NH4+. Experimental results with the set of parameters of author Giorgio Mannina et al., 2011 show that the largest error between simulation results and measured data for COD parameter is 10%. The calculation results for other parameters all give error <15%.

The built numerical model is allowed to calculate the output concentration of some pollution parameters by the AO - MBBR system, in order to evaluate the treatment efficiency of the systems and assist in the design.

Keyword: Modeling; simulation; MBBR; leachate treatment; wastewater treatment