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Automatic dosage control method for treatment of heavy metal polluted water and device thereof

A control method and heavy metal technology, applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problem of low solubility

Inactive Publication Date: 2012-05-23
长春联创水质工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to effectively solve the key problem of dosing control in the existing heavy metal polluted water treatment process, the solubility products of heavy metal sulfides are different, and the solubility of heavy metal sulfide precipitation is lower than that of hydroxide precipitation, so that the selection of heavy metals can be realized. Sedimentation

Method used

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  • Automatic dosage control method for treatment of heavy metal polluted water and device thereof
  • Automatic dosage control method for treatment of heavy metal polluted water and device thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] according to figure 1 As shown, when using PID controller, mathematical operator and logarithmic operator to realize automatic continuous dosing control, the online pH sensor (7) detects the pH value in the polluted water before adding the vulcanizing agent, and sends The device (12) outputs the corresponding 4~20mA signal to the PID controller (5); after the PID controller (5) receives the output signal of the online pH sensor (7), it outputs the corresponding The 4-20mA control signal is sent to the acid dosing pump (13) or alkali dosing pump (14) and its corresponding solenoid valve (10) with a 4-20mA signal receiving function to automatically and continuously control the acid dosing pump or alkali The dosing pump adds acid or alkali to the reaction device (1) to make the polluted water reach the set pH range; after the pH value of the polluted water is adjusted, the online S 2- Concentration sensor (8) detects when starting to add vulcanizing agent Concentration,...

Embodiment 2

[0040] according to figure 2 As shown, when the PLC programmable controller is selected to realize the automatic continuous dosing control, the online pH sensor (7) first detects the pH value in the polluted water before adding the vulcanizing agent, and outputs the corresponding pH value through the transmitter (10). 4~20mA signal to PLC programmable controller (5); after PLC programmable controller (5) receives the output signal of online pH sensor (7), according to the preset pH value range, output the corresponding The 4-20mA control signal is sent to the acid dosing pump (11) or alkali dosing pump (12) and its corresponding solenoid valve (9) with a 4-20mA signal receiving function to automatically and continuously control the acid dosing pump or alkali The dosing pump adds acid or alkali to the reaction device (1) to make the polluted water reach the set pH range; after the pH value of the polluted water is adjusted, the online S 2- Concentration sensor (8) detects whe...

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Abstract

The invention provides an automatic dosage control method for treatment of heavy metal polluted water and a device thereof, belonging to the field of water treatment. The method and the device can solve the key issue of dosage control during treatment of the heavy metal polluted water, and achieve dual control of the parameters pH and pS of solution through an online pH sensor and an online S2 concentration sensor, thereby ensuring the appropriate dosage of the curing agent needed for complete precipitation of the heavy metal sulfide, realizing the automatic, accurate and continuous control of curing agent dosage, and guaranteeing that the water discharged after treatment stably reaches the standards.

Description

technical field [0001] The invention relates to an automatic dosing control method and device for treating heavy metal polluted water, which can simultaneously treat one or more kinds of heavy metal polluted water, and realize automatic, continuous and accurate control of dosing amount, and belongs to the technical field of water treatment. Background technique [0002] With the development of heavy metal polluted water treatment technology, at present, the chemical precipitation method is generally used to treat heavy metal polluted water at home and abroad. removed from water bodies. Alkaline agents and vulcanizing agents are usually used to precipitate heavy metal ions in heavy metal polluted water, forming insoluble heavy metal hydroxide precipitates and heavy metal sulfide precipitates, and removing heavy metals from water bodies. [0003] Whether it is using alkaline chemicals or vulcanizing agents to precipitate heavy metal ions in heavy metal polluted water, the mos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/62
Inventor 廉新颖王鹤立申亮
Owner 长春联创水质工程有限公司
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