A method for estimating progress of activated sludge wastewater treatment based on invariant observer
A technology of activated sludge method and progress estimation, which is applied in water/sludge/sewage treatment, biological water/sewage treatment, water treatment parameter control, etc. fast effect
Active Publication Date: 2018-10-26
UNIV OF JINAN
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The ASM model can describe the process of sewage treatment relatively accurately, but it has many parameters, is difficult to identify, and has certain restrictions on its use.
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[0036] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0037] The model of the activated sludge method is a strongly coupled multi-input and multi-output system, which has characteristics such as highly nonlinear, uncertain, and time-lag, so the simplified model of the activated sludge method is adopted in the present invention, and its model is as follows figure 2 shown.
[0038]Among them, Q is the water flow rate, S in is the influent substrate concentration, S ε is the substrate concentration in the effluent, X ε is the concentration of biosolids, X r is the concentration of return sludge, Q w is the sludge discharge in the return line, Q r is the amount of returned sludge. Let S be the concentration of the reactor substrate, X be the concentration of the microorganisms in the reactor, S o is the concentration of dissolved oxygen, and V is the volume of the reactor.
[0039] The mathematical ex...
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The invention discloses a method for estimating the sewage treatment progress of the activated sludge process based on an invariant observer. By constructing the model of the activated sludge process and combining the net increase of microorganisms, the generation rate of substrate and oxygen, the activated sludge is constructed The mathematical model of growth process; select H(y / s)=ln(y / s) as its invariant function, output is y=S, the mathematical model of sexual sludge growth process is constructed as the invariant observer of convergence ; Utilize the invariant observer to carry out on-line measurement of microbial concentration, substrate concentration and dissolved oxygen concentration, and realize the tracking of observed quantities. The present invention utilizes a soft measurement method, which is more economical than previous sensor and instrument measurements, and can realize Effective tracking of microbial concentration, substrate concentration and dissolved oxygen concentration in the sewage treatment process of activated sludge method, with fast response and accurate measurement.
Description
technical field [0001] The invention relates to a method for estimating the progress of sewage treatment by activated sludge method based on an invariant observer. Background technique [0002] In recent years, due to the aggravation of environmental pollution and the serious shortage of water resources, the problem of sewage treatment has received extensive attention. The purpose of sewage treatment is to enable sewage to be safely discharged or reused. Commonly used sewage treatment methods include activated sludge method, biofilm method, internal electrolysis method, etc. Activated sludge method has high efficiency, low energy consumption, little pollution, and adapts to The vast majority of urban sewage treatment adopts the activated sludge method. [0003] In the process of applying the activated sludge method to treat sewage, it is necessary to measure some important parameters in the biochemical process in real time and accurately. It is especially important to selec...
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IPC IPC(8): G01N33/18C02F3/12
CPCC02F3/12C02F2209/22C02F2209/36G01N33/18Y02W10/10
Inventor 宗西举刘颖波程新功
Owner UNIV OF JINAN