Abstract
The paper presents the complete design processes of novel aeration control systems in the SBR (sequencing batch reactor) wastewater treatment plant (WWTP). Due to large energy expense and a high influence on biological processes, the aeration system plays a key role in WWTP operation. The paper considers the aeration system for a biological WWTP located in the northeast of Poland. This system consists of blowers, the main collector pipeline, three aeration lines with different diameters and lengths, and diffusers. Classical control systems applied for this type of installation are based on PID (proportional–integral–derivative) controllers, the settings of which are often found experimentally. The article presents the optimization of these settings and the design of an alternative control algorithm—the fuzzy controller.
Highlights
The development of civilization is accompanied by population growth, technology development, and the increased production of pollutants
dissolved oxygen (DO) control is very important for improving energy efficiency in the wastewater treatment plant, as the energy costs of the aeration process represent more than 50% of total operating costs [2]
This paper presents the design of the aeration control system, taking into account the dynamics of pipelines and blowers
Summary
The development of civilization is accompanied by population growth, technology development, and the increased production of pollutants. The SBR is a reservoir in which purification processes occur cyclically using the biological activated sludge method. This method makes use of microorganisms, the metabolism of which absorbs organic pollutants. Aeration and mixing—the phase of growth of microorganisms and development of biological processes related to purification. A lack of oxygen causes the death of microorganisms that worsens the properties of activated sludge This leads to a deterioration in the quality of treated wastewater. DO control is very important for improving energy efficiency in the wastewater treatment plant, as the energy costs of the aeration process represent more than 50% of total operating costs [2].
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