Intelligent precise dosing system for denitrification deep-bed filter carbon source

Abstract

The invention provides an intelligent precise dosing system for a denitrification deep-bed filter carbon source. The system is used for acquiring at least one parameter thereof on the basis of different phases of running to provide control signals for a dosing metering pump, wherein during the first phase, a control signal for the dosing metering pump is generated according to theoretical calculation and on the basis of the acquired COD (chemical oxygen demand), flow, dissolved oxygen, temperature and pH value signals, and the parameters on which calculation is based every time, and the calculation results are stored as historical records; during the second phase, searching and matching are carried out according to the historical parameters accumulated during the first phase so as to generate a control signal for the dosing metering pump; and during the third phase, curve fitting is carried out on the historical parameters accumulated during the first phase and the second phase, the control value of the dosing metering pump is used as an unknown function, the acquired signal parameters are used as control functions, an empirical calculation formula is obtained by fitting, and a control signal for the dosing metering pump is calculated according to the empirical formula.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a denitrification deep bed filter based on historical data and adopting a carbon source intelligent precision dosing system. Background technique [0002] Denitrification deep bed filter is a kind of advanced treatment and filtration process in sewage treatment. It originated in the United States in the 1970s. It has centralized functions and flexible operation. It can simultaneously perform physical filtration to retain SS (suspended solids) TP (total phosphorus) and biological denitrification to remove TN (total nitrogen). When the denitrification deep bed filter process is used in the advanced treatment of sewage, most of the carbon sources (organic substances) of the sewage entering the advanced treatment stage have been removed due to the previous process treatment, so the denitrification deep bed filter process is in operation Additional carbon sources (organic ...

AI Technical Summary

Problems solved by technology

However, if the effluent exceeds the standard, when the PLC collects the post-feedback signal (that is, the nitrate concentration signal of the effluent), the phenomenon of the effluent exceeding the standard cannot be changed immediately, because the PLC sends a modified dosing pump to the dosing pump according to the preset correction value After the quantity instruction, at least the sewage stays in the filter to improve the effluent water quality, there is a problem of control lag

Secondly, the pre-feedback + post-feedback control only uses three control parameters, the influent flow rate and the nitrate concentration in the influent and effluent water. There are few control parameters, and various correction values ​​need to be manually set, and the settings of the correction values ​​are all from the theory. The calculation cannot fully meet the needs of the actual operation on site

In addition, fewer control parameters also make the fault tolerance rate of the entire system low. Once a problem occurs in a certain signal acquisition instrument, the entire system cannot operate normally.

[0004] Therefore, there is a need for a more accurate and intelligent carbon source dosing system for denitrification deep bed filters, which can overcome the problem of imprecise control in the above-mentioned prior art, and control the dosage of carbon sources more accurately and intelligently

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