Synthesizing a Control System for Removing Nitrogen Compounds from Wastewater
Abstract
Introduction: The existing systems of sewage treatment by activated sludge are used for a narrow range of pollution concentrations. Control can expand the range; however, when the water composition changes at the system entrance or when the environmental conditions vary, the control parameters have to be continuously readjusted. Purpose: The goal of this work is synthesizing a control system with dynamic logic to remove contaminants in a wide range of concentrations. Results: On the base of ASM1 mathematical model description, a scheme of interaction between biochemical reaction components is developed. A controllable mathematical model is presented for removing nitrogen compounds in a two-zone bioreactor with recycling of nitrates, a block of ultrafiltration membranes and a returnable sludge stream towards the first zone. Process quality indices are introduced for the biological wastewater treatment control system. On their basis, a technique of parametrical setup of the regulator with logically reconstructed structure is developed. For the regulators, the concepts of a leader and a false leader are introduced. According to the developed model, a computer model is constructed in MatLab/Simulink environment. The modeling results demonstrate the possibility of high-quality cleaning when the levels of entrance multicomponent pollutions change in a wide range in a predefined invariable volume of the bioreactor. Practical relevance: Using the logic-dynamic regulator with optimum settings of parameters helps to provide admissible output concentration of ammonium, nitrates and COD at all the operating modes of the control system.Published
2015-08-01
How to Cite
Grudyaeva, E. (2015). Synthesizing a Control System for Removing Nitrogen Compounds from Wastewater. Information and Control Systems, (4), 59-68. Retrieved from http://proceedings.spiiras.nw.ru/index.php/ius/article/view/4355
Issue
Section
System and process modeling