Method for controlling feeding amount of chemical phosphorus removal reagents of water reclamation plants based on fuzzy control

Abstract

The invention relates to a novel practical feedforward and feedback control method for the phosphorus removal reagent feeding of urban water reclamation plants. According to the provided control method, a feedforward control link is built on the basis of a phosphorus removal reagent feeding model, and an outlet phosphorus content, an inlet water flow and an inlet phosphorus content are taken as input / output control quantity compensation values of a fuzzy system. Due to the introduction of the compensation values, the system has a certain self-adaption ability, which facilitates the elimination of interferences of factors such as biological phosphorus removal and the like of subsequent phosphorus removal processes. Because other influence factors are considered in the fuzzy system used in the method, the system can implement a more precise reagent feeding process in comparison with general feedforward and feedback control methods, thereby reducing the operating cost of the system; the absorption of microorganisms to organic matter, phosphorus and nitrogen is further promoted, the consumption of required chemical phosphorus removal reagents is lowered, and the biological colony structure in a biological tank is optimized to a certain extent; and the method not only can reduce the economic burden of sewage treatment plants, but also brings a positive influence to an activated sludge process.

Description

technical field [0001] The invention relates to a fuzzy control chemical dosage method, relates to the field of chemical phosphorus removal in reclaimed water plants, and in particular to a fuzzy control-based chemical phosphorus removal chemical dosage method in reclaimed water plants. Background technique [0002] Phosphorus contained in domestic sewage mainly comes from the following sources: excreta from sewer pipes, discarded food, and various other detergents. If the high content of phosphorus in the sewage is not treated, it will easily lead to eutrophication of the water body and cause serious pollution. Therefore, it is very important to introduce related phosphorus removal technology in sewage treatment. At present, the main methods of phosphorus removal in urban domestic sewage include chemical phosphorus removal method, biological phosphorus removal method and constructed wetland technology. [0003] Chemical phosphorus removal is a method of removing phosphoru...

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Problems solved by technology

During the research process, the inventor found that the excessive addition of chemical reagents would lead to too low phosphorus content in the biological pool, resulting in insufficient phosphorus content required for the growth of phosphorus accumulating bacteria, which greatly inhibited the growth of phosphorus accumulating bacteria colonies, and then affected it. The absorption of organic matter, phosphorus and nitrogen reduces the effect of biological phosphorus removal

In this way, excessive dosing will not only increase the economic burden of the sewage treatment plant, but also have a negative impact on the activated sludge process

In addition, under the premise of a large hysteresis of up to 3 to 4 hours in the activated sludge process (SBR), it is difficult for the general feedback control of phosphorus removal and dosing to play its due role

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