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Activated sludge system simulation and control software (ASSSC) Development and Application Research

Author: QianSuZuo
Tutor: SunPeiDe
School: Zhejiang Technology and Business University
Course: Environmental Engineering
Keywords: Activated sludge Mathematical model Numerical Simulation Process software Sewage treatment plant Negative feedback control
CLC: X703
Type: Master's thesis
Year: 2011
Downloads: 81
Quote: 0
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Abstract


With the development of society, increasing the amount of sewage discharge and sewage effluent quality requirements are more stringent. In order to achieve the best treatment economic and social benefits, is bound to the sewage treatment process to optimize the design and control. In activated sludge process as the main biological treatment of sewage is currently the treatment of industrial organic wastewater and municipal sewage main way, but from the perspective of control theory and biochemical processes are typically nonlinear, time-varying, uncertainty , delay of complex systems. Therefore, people must rely on mathematical models of sewage treatment and computer simulations to study and master the activated sludge wastewater treatment processes and rules of the state, to achieve the sewage treatment process and control strategies to optimize the design and optimization of control. Compared to international standards, China's treatment in the sewage sludge mathematical model of research and application is still lagging behind, has not yet established a reliable simulation and control simulation platform. To shorten the gap with foreign countries, this paper attempts to use object-oriented ideas and methods, the use of Microsoft Visual C 6.0 and Matlab as a tool for modeling the activated sludge process, in the \oxygen tank, oxygen tank, secondary settling tank and other facilities modeled separately, through the design of the program algorithm, different reactor modules grouped together according to the actual process in order to develop a set of simulation platform with activated sludge system simulation and control Software (Activated Sludge System Simulation and Controlling: ASSSC). The software includes sewage treatment plant structures and classic craft standard library package that can be freely combined the actual operation of the sewage treatment process; adapt to China's national conditions and based on a fully coupled mathematical model of the activated sludge system (Full Coupled Activated Sludge Model: FCASM3 ), running processes to achieve water quality simulations predicted that proposes to optimize process design methods, so as to promote the optimal design of wastewater treatment and computer-aided design. In this paper ASSSC laboratory enhanced biological phosphorus removal (EBPR) systems modeling to study the changes in water temperature at different phosphorus removal under the appropriate mechanism to finish ASSSC in a small trial in check. When the water temperature was 20 ℃, 25 ℃, 30 ℃ and 35 ℃, the EBPR systems, heating causes phosphorus removal efficiency decreases, the temperature recovery physical modeling and numerical simulation results show that: the water temperature at 25 ℃, 30 ℃ run in parallel , EBPR phosphorus removal system is required for the recovery time varies with water temperature increases; when the parallel temperature reached 35 ℃, 20 ℃ temperature even with recovery means in the short term can not be restored to the pre-heating phosphorus removal; thus results, to make the effluent phosphorus EBPR system efficiency of 80% or more, the system required to maintain the temperature below 30 ℃ range, to prevent the phenomenon of higher than 35 ℃. This indicates ASSSC able to draw the best process operation conditions, and to prevent the emergence of unknown hazards. ASSSC AAO process of sewage treatment plant and a new oxidation ditch process of model building site simulation, the completion of the software in the actual process of verification. Actual sewage treatment process dynamic simulation results show that, ASSSC can better achieve the sewage treatment process to remove organic matter and biological phosphorus removal process simulation, simplifying the model predictions with the parameter adjustment process, speed up the process optimization mathematical model guide the actual running pace. Meanwhile, this paper check completed ASSSC, the SBR negative feedback control unit to conduct applied research. In the development of the dissolved oxygen concentration in ASSSC (DO), temperature (T) and pH three parameters negative feedback control interface, the use of laboratory core model FCASM3 negative feedback SBR process control equipment for one month three parameters negative feedback control System Simulation and Control. The results show that, ASSSC activated sludge system according to DO, T, pH changes, a reasonable amount of aeration automatically adjust the temperature and pH conditions in water quality standard, you can improve process efficiency, to achieve energy efficiency purposes. While calling the internal model of the activated sludge process modeling studies on the run, to achieve enhanced biological phosphorus removal systems SBR process parameters of three negative feedback control, sewage treatment plant for the realization of automatic control and optimization of real-time operation of the foundation.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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