Abstract
A mathematical model of nitrate removal in woodchip denitrification bioreactor based on field experiment measurements was developed in this study. The approach of solving inverse problem for nonlinear system of differential convection-reaction equations was applied to optimize the efficiency of nitrate removal depending on bioreactor’s length and flow rate. The approach was realized through the developed algorithm containing a nonlocal condition with an incorporated PI controller. This allowed to adjust flow rate for varying inflow nitrate concentrations by using PI controller. The proposed model can serve as a useful tool for bioreactor design. The main outcome of the model is a mathematical relationship intended for bioreactor length selection when nitrate concentration at the inlet and the flow rate are known. Custom software was developed to solve the system of differential equations aiming to ensure the required nitrate removal efficiency.
Highlights
Release of nitrate (NO )from agricultural sources is a significant surface water quality problem occurring in many areas around the world
This technology is based on routing tile drainage water through woodchip bioreactors where nitrate is used by bacteria to oxidize carbon while reducing
The main purpose of this paper is to present a mathematical model for the processes within the woodchip denitrification bioreactor applicable to simulate chemical transport of nitrates and oxygen, and to control and optimize the nitrate conversion efficiency
Summary
From agricultural sources is a significant surface water quality problem occurring in many areas around the world. This problem is severe in humid climates where subsurface (tile) drainage systems have been installed. Woodchip denitrification bioreactors for tile drainage are being investigated for practical edge-of-field NO – 3 removal. This technology is based on routing tile drainage water through woodchip bioreactors where nitrate is used by bacteria to oxidize carbon while reducing. A bioreactor consists of subsurface trench filled with a carbon source (most often woodchips) through which water is allowed to flow before leaving the drain to enter a surface water body.
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