Automatic control method and apparatus for delivering medicine to process heavy metal ion containing wastewater

Abstract

The invention provides an automatic dosing control method for removing heavy metal ions in wasterwater containing the heavy metal ions and a device thereof. The method and the device are mainly suitable for automatic dosing control during treating the wastewater containing the heavy metal ions by adopting the chemical precipitation method. The control method comprises the following steps of: 1. detecting an ORP1 value with a certain pH value before heavy metal precipitator is added; 2. detecting an ORP2 value after the heavy metal precipitator is added and a heavy metal complete precipitation reaction is generated; 3. automatically controlling the dosage and the dosing process of the heavy metal precipitator according to an ORP difference value (ORP1 minus ORP2) between the ORP1 which is detected before the heavy metal ion precipitation is completed and the ORP2 which is detected after the heavy metal ion precipitation is completed. The control device comprises two sets of online detecting ORP meters, an automatic control system adopting the PID technology and the PLC technology and a plurality of dosing pumps. The invention is an automatic continuous dosing control technology for the heavy metal ion precipitation reaction in the treatment for the wastewater containing the heavy metal ions through combining the ORP technology and the PID / PLC technology into a whole, can effectively solve the continuous precise dosing problem during the treatment of the wastewater containing the heavy metal ions, and ensure that the treated water which can meet the standard is discharged continuously and stably.

Description

technical field [0001] The present invention relates to an automatic dosing control method and device for the treatment process of wastewater containing heavy metal ions, in particular to an automatic dosing control method capable of treating wastewater containing multiple heavy metal ions at the same time, ensuring accurate dosing, continuous and stable treatment of water up to standard and its The device belongs to the technical field of environmental protection industrial waste water treatment. technical background [0002] At present, the chemical precipitation method is commonly used at home and abroad to treat wastewater containing heavy metal ions. The chemical precipitation method is to convert soluble heavy metal ions into insoluble or insoluble metal compounds, thereby removing them from the treated water, including the use of alkaline agents (such as: sodium hydroxide, lime, sodium carbonate, etc.), vulcanizing agents (such as: sodium sulfide, ammonium sulfide, et...

AI Technical Summary

Problems solved by technology

[0004] Regardless of the use of alkaline agents, vulcanizing agents, and polymer heavy metal chelating agents to precipitate heavy metal ions in wastewater, the most critical link in heavy metal ion precipitation in wastewater treatment containing heavy metal ions-automatic dosage control technology, in recent years, although A lot of research has also been done, but there has been no breakthrough

For many years, the precipitant dosing control of heavy metal ion precipitation treatment has been realized by detecting the basic parameter of pH value, or can only be manually dosed quantitatively

[0005] It is generally used to detect the pH value of wastewater in the process of heavy metal ion precipitation reaction to realize the dosing control in the process of heavy metal ion precipitation. The problem that is prone to occur is: detecting the pH value to control the precipitation process often cannot guarantee whether the heavy metal ion precipitation process is correct or not. complete end, with the result that automatic overdose control is often employed

In addition, for wastewater containing multiple heavy metal ions at the same time, the dosing control process is more difficult due to the different precipitation pH values ​​corresponding to each heavy metal ion, the different types of heavy metal ions, and the changes in the content and composition of the species.

[0006] Similarly, in the process of treating wastewater with polymer heavy metal chelating agents, foreign products recommend testing the ORP value at the end point of the reaction when the heavy metal precipitation in the treated water is completed for dosing control. The problem that is also prone to occur is: the detected ORP end point value is affected by the pH of the treated water The value, the type of heavy metal ions, the concentration of heavy metal ions, etc. are greatly affected, and it is difficult to achieve dosing control

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