Optimization control device for chemical phosphorus removal process

A technology for process optimization and chemical phosphorus removal, which is applied in various fluid ratio control, chemical instruments and methods, water/sewage multi-stage treatment, etc. Difficulty in operation and maintenance, etc., to reduce the risk of exceeding the standard, improve the treatment effect, and reduce the cost

Active Publication Date: 2014-02-26
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above technology has the following problems: 1) many water quality instruments are required, and the operation and maintenance are difficult; 2) the correlation of the biological phosphorus removal process is complicated, and the linear calculation formula of the dosage cannot reflect the actual nonlinear reaction process; 3 ) Since the effective content of the medicament may vary with batches, in order to determine the dosing coefficient of this technology, etc., the effective content of each batch of medicament must be tested before use, which is time-consuming and laborious

Method used

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  • Optimization control device for chemical phosphorus removal process
  • Optimization control device for chemical phosphorus removal process
  • Optimization control device for chemical phosphorus removal process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Process operation status: AA0 process of an urban sewage treatment plant with a scale of 100,000 tons / day, divided into two series, adopting synchronous chemical phosphorus removal process, setting up three phosphorus removal agent dosing pumps 5, and setting the dosing point in the biochemical treatment Outlet of unit 1 ( figure 1 ① as shown), the effluent total phosphorus discharge standard is 0.5mg / L. An electromagnetic flowmeter 61 is set at the water inlet of the biological treatment unit 1 , an online phosphate meter 62 is set at the water outlet of the secondary sedimentation tank 2 , and an effluent total phosphorus meter 63 is set at the water outlet of the advanced treatment unit 3 . Add a chemical phosphorus removal control cabinet near the dosing pump for phosphorus removal agents, and configure industrial computers, PLCs, frequency converters for dosing pumps, etc. Instrument signals such as phosphate effluent, effluent total phosphorus, and influent flow ...

Embodiment 2

[0067] On the basis of Example 1, this example adopts the post-position phosphorus removal process, and changes the dosing point to figure 1 As shown in ② position, instrument configuration and other device settings remain unchanged. The phosphate control of the effluent of the secondary sedimentation tank adopts the feed-forward proportional algorithm, and the dosing flow ΔQ is calculated according to formulas (3) and (5) 1 , the parameter K in formula (5) 3 and K 4 The initial values ​​are 2 and 0.5, which are further determined to be 5 and 0.6 through on-site debugging experiments. Feedforward water compensation control dosing amount ΔQ 2 and effluent total phosphorus safety margin feedback compensation dosing amount ΔQ 3 The calculation process is the same as the first embodiment.

[0068] Through trial operation, the total phosphorus in the effluent reaches the standard stably, and compared with constant dosing, the dosage is reduced by more than 20%.

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Abstract

The invention relates to an optimization control device for a chemical phosphorus removal process. The optimization control device comprises a process monitoring instrument, a frequency converter and an industrial personal computer, wherein the process monitoring instrument is used for monitoring water quantity and water quality data of key nodes, the input end of the frequency converter is connected to the industrial personal computer, the output end of the frequency converter is connected to a dosing pump, and the outflow rate of the dosing pump is controlled by changing the motor frequency of the dosing pump; a phosphorus removal agent flow rate control unit is also arranged in the industrial personal computer and comprises a dosing pump flow rate control module, a secondary sedimentation tank yielding water phosphate control module, a feed-forward water quantity compensation module, and a yielding water total phosphorus safety allowance feedback compensation module; and the dosing pump flow rate control module is used for calculating the current dosing flow rate according to the addition dosage which is output by the secondary sedimentation tank yielding water phosphate control module, the feed-forward water quantity compensation module, and the yielding water total phosphorous safety allowance feedback compensation module, converting the current dosing flow rate into a control signal and outputting the control signal to the frequency converter so as to control the dosing pump. The optimization control device is suitable for synchronous and post-positioned chemical phosphorus removal processes and can stabilize the concentration of yielding water phosphate.

Description

technical field [0001] The invention relates to the technical field of urban sewage treatment, in particular to a dosing control device for a chemically assisted phosphorus removal process in a sewage treatment process. Background technique [0002] As of 2012, nearly 4,000 sewage treatment plants have been built in my country. Due to the lack of experienced personnel and insufficient technical equipment, there are still many deficiencies in the operation of the current sewage treatment process. In order to exert environmental benefits, it is urgent to improve the operation level of the sewage treatment process and realize the stable operation of the process. At present, most sewage treatment plants have begun to carry out auxiliary chemical phosphorus removal to achieve lower effluent total phosphorus concentration and meet higher effluent water quality requirements. [0003] The chemical phosphorus removal process is classified according to the different dosing points of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14G05D11/13
Inventor 邱勇施汉昌庞洪涛
Owner TSINGHUA UNIV
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