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A precise dosing system and control method for chemical phosphorus removal

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: 2022-03-08
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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  • A precise dosing system and control method for chemical phosphorus removal
  • A precise dosing system and control method for chemical phosphorus removal
  • A precise dosing system and control method for chemical phosphorus removal

Examples

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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 precise dosing system and control method for chemical phosphorus removal, belonging to the technical field of sewage treatment. The system includes a sewage treatment tank component, a dosing device component, a feedforward control component and a feedback control component. Water orthophosphate load, effluent orthophosphate concentration target value calculates the feed-forward dosing amount, the system automatically adds phosphorus removal agent, and automatically adjusts the dosing amount according to the deviation of the effluent orthophosphate concentration from the target value, so that the total phosphorus in the effluent The concentration is stable near the control value, which saves the dosage of chemicals to the greatest extent. The invention not only solves the problem of coarse dosing of phosphorus removal agents in sewage plants, but also increases the stability of effluent, solves the problem of lag between dosing and effluent water quality to the greatest extent, and makes the management of sewage plants move 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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Patent Type & Authority Patents(China)
IPC IPC(8): G05D11/13C02F9/14C02F1/52C02F101/10
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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