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Chemical phosphorus-removal accurate dosing system and chemical phosphorus-removal accurate dosing control method

A chemical phosphorus removal and control method technology, applied in chemical instruments and methods, multiple fluid ratio control, ratio control, etc., to achieve the effect of solving the hysteresis of reaching the standard and increasing the stability of the effluent

Active Publication Date: 2020-03-06
光大水务(深圳)有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem of extensive dosing of phosphorus removal agents in existing sewage plants, the present invention provides a system and method for accurately controlling the dosage of phosphorus removal agents based on the influent positive phosphorus load (feedforward) and effluent positive phosphorus concentration (feedback), On the premise that the effluent water quality of the sewage plant is stable and up to standard, resources can be saved, and the management of the sewage plant can be refined.

Method used

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  • Chemical phosphorus-removal accurate dosing system and chemical phosphorus-removal accurate dosing control method
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  • Chemical phosphorus-removal accurate dosing system and chemical phosphorus-removal accurate dosing control method

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Embodiment 1

[0045] A precise dosing system for chemical phosphorus removal of the present invention includes a treatment pool group, a control component and a phosphorus removal agent dosing component. Such as figure 1 As shown, the treatment pool group includes a biological pool, a secondary sedimentation tank, a secondary lifting pump room, a high-efficiency sedimentation tank, a filter tank and a disinfection tank. In this treatment tank group, the number of primary sedimentation tanks, biological tanks, secondary sedimentation tanks, high-efficiency sedimentation tanks, filters and contact disinfection tanks can be set to one or more according to specific needs. Biological pools include anaerobic pools, anoxic pools and aerobic pools which are arranged in sequence. Orthophosphate online monitors are installed at the outlet of the secondary sedimentation tank and the outlet of the high-efficiency sedimentation tank, and flow meters are installed at the inlet of the sewage plant.

[0...

Embodiment 2

[0069] The basic content of this example is the same as that of Example 1, the difference is that in this example, the phosphorus removal agent is polyferric sulfate, the active ingredient content is 12%, and the density is 1.45g / mL. At a certain moment, when the influent total phosphorus concentration is 4.30mg / L, the concentration of orthophosphate in the secondary sedimentation tank is C 1 When it is 1.45mg / L, the β value is 10.4. According to the concentration of orthophosphate in the effluent of the secondary sedimentation tank and the corresponding dosing coefficient, calculate the dosing rate:

[0070] m 1 =15.05(C 1 -C sp / α)β

[0071] Among them: M 1 ——dosing rate, the mass of PFS solution per liter of sewage, mg / L;

[0072] C 1 ——Concentration of orthophosphate in the effluent of the secondary sedimentation tank, mg / L;

[0073] C sp ——The target value of orthophosphate concentration in the effluent of the high-efficiency sedimentation tank is 0.3mg / L;

[00...

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Abstract

The invention discloses a chemical phosphorus-removal accurate dosing system and a chemical phosphorus-removal accurate dosing control method, and belongs to the technical field of sewage treatment. The chemical phosphorus removal accurate dosing system includes a sewage treatment tank assembly, a dosing device assembly, a feedforward control assembly and a feedback control assembly. The chemicalphosphorus-removal accurate dosing control method includes the steps: according to monitoring values of orthophosphates in inflow water and outflow water, dosing of a ferric salt phosphorus-removal agent is adjusted; and through the feedforward control assembly, according to an inflow-water orthophosphate load and an outflow-water orthophosphate concentration target value, a feedforward dosage iscalculated, the chemical phosphorus-removal accurate dosing system automatically adds the phosphorus-removal agent, according a deviation between outflow-water orthophosphate concentration and the outflow-water orthophosphate concentration target value, the dosage is automatically adjusted in a feedback mode, therefore, total-phosphorus concentration of the outflow water is stable near a control value, and the agent dosage is reduced to the maximum extent. By adopting the chemical phosphorus-removal accurate dosing system and the chemical phosphorus-removal accurate dosing control method, notonly is a phosphorus-removal agent crude adding problem of a sewage plant solved, but also the stability of the outflow water can be improved, and a dosing problem and an outflow-water quality qualification hysteresis problem are solved to the maximum extent, so that sewage plant management develops towards refinement.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and more specifically relates to a precise dosing system and control method for chemical phosphorus removal. Background technique [0002] In recent years, the rapid development of cities and industries has led to the discharge of a large amount of nitrogen and phosphorus nutrients, which has seriously deteriorated the water quality of natural and urban water bodies. The country and local governments have successively promulgated sewage discharge standard documents to strictly control the discharge of phosphorus. [0003] At present, there are two ways of adding chemical phosphorus removal agent: artificial dosing and intelligent dosing. Under the pressure of current environmental protection policies, in order to ensure that the effluent meets the standards, most of the artificial dosing methods adopt extensive dosing methods to control the total phosphorus value of the effluent to a le...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/52G05D11/13C02F101/10
CPCC02F9/00C02F1/5281G05D11/131C02F1/001C02F2001/007C02F2101/105C02F2303/04C02F1/00
Inventor 尹亚云王冠平蒲文鹏张永光陈永娟徐雯周信哲
Owner 光大水务(深圳)有限公司
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