Research Of Biological Nitrogen Removal Based On BSM1 Sewage System Control Strategy

In this paper, the background for the study of sewage treatment, detailing the source of sewage and pollutants classification, the different pollutants should take a different approach to effectively purify the sewage. The authors presented a detailed activated sludge biological wastewater treatment technology, the basic processes, influencing factors, biological nitrogen removal mechanism and process, and described activated sludge biological wastewater treatment process in the development of mathematical models and sewage in the common operating variables."Benchmark simulation model No. 1" (BSM1) by activated sludge model ASM1 and TakacsⅠsecondary settling tank model composed of an integrated model. This article from the device structure, model mathematical models, water load data, and evaluation criteria were introduced. Through the Matlab programming language and Simulink simulation environment, two kinds of building a platform for analysis and comparison of methods, and ultimately determine the use of Simulink simulation environment built on BSM1 activated sludge removal system platform.BSM1 simulation platform is composed of nine S-function module of the form, they are the biochemical pool module (1~5), secondary sedimentation tank module, hydraulic time delay module, hybrid modules and water flow separation modules. Then the steady-state data using BSM1 provided for evaluation, test results and the Working Group to the evaluation data are consistent, indicating that this platform can be applied to a variety of control strategies of research and analysis.In this paper, the activated sludge removal system presents a conventional control strategy, select the system that is a mixture of dissolved oxygen and flow back to PI control, respectively, described their control strategy and control algorithm and designed a mixture of oxygen and return flow of the PI controller, and then test the model in three water control results, and system performance evaluation through the comparison shows that the conventional control strategy for the control of BSM1 removal system there is not perfect, should develop a more optimized control strategies to get better water quality performance indicators.In the conventional control strategy is proposed based on the other is the optimal control strategy, select the system that is dissolved, the mixture back to the flow, sludge and return sludge flow control emissions and other variables fuzzy control strategy and design dissolved oxygen in the system, the return flow and the remaining sludge mixture emissions fuzzy controller. Through the above two control strategies of water quality performance comparison, we can see, optimal control strategy is superior to conventional control strategies, the basic performance of its water quality and energy-saving effect was qualified, can be extended to other systems of control of nitrogen in.