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Adding control method of heavy metal trapping agent

A heavy metal trapping agent and control method technology, applied in chemical instruments and methods, material analysis by observing the impact on chemical indicators, analysis by making materials undergo chemical reactions, etc., can solve the problem of reducing water quality and increasing disulfide Substituting carbamic acid heavy metal trapping agent cost and other issues, to achieve the effect of low price

Active Publication Date: 2012-08-08
KURITA WATER INDUSTRIES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the treatment method of the heavy metal-containing wastewater using the dithiocarbamate heavy metal trapping agent, if the wastewater quality of the heavy metal contained changes by quantitatively adding the chelate heavy metal trapping agent, If the amount of chelate-based heavy metal trapping agent added is insufficient or excessive, the treated water quality will be reduced.
On the other hand, when adding excessively, the cost of dithiocarbamic acid heavy metal trapping agent will be increased in vain

Method used

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  • Adding control method of heavy metal trapping agent
  • Adding control method of heavy metal trapping agent
  • Adding control method of heavy metal trapping agent

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0069] Absorbance spectra were measured for four kinds of agents 1 to 4 in Table 1 as dithiocarbamic acid heavy metal trapping agents and are shown in image 3 middle. As shown in the figure, any collector has a strong absorption band at a wavelength of 200-350 nm and an absorption peak around a wavelength of about 240 nm. Also, the absorbance at wavelengths above 400 nm is very small.

[0070] Table 1

[0071]

experiment example 2

[0073] In water dissolved with 30 mg / L of agent 3 as a trapping agent, as Fe 2+ Add 10mg / L FeSO 4 , and measure the absorbance spectrum. The results are shown in Table 4. exist Figure 4 also shows that no FeSO 4 time spectrum.

[0074] Such as Figure 4 As shown, by adding Fe 2+ , and it was confirmed that strong absorption peaked at a wavelength of 420 nm.

[0075] Therefore, the determination of the change in FeSO relative to a 30 mg / L aqueous solution of agent 4 The absorbance at 470nm wavelength when the added amount is shown in Figure 5 middle. Such as Figure 5 As shown, in Fe 2+ The absorbance reached the limit when the amount added was 10 mg / L or more, and it was confirmed that Fe 2+ The equivalent reaction amount with 30 mg / L of drug 3 is 10 mg / L.

[0076] Therefore, the concentration of the drug 3 is set in the range of 3 to 30 mg / L, and the amount of Fe that is more than the equivalent reaction amount is measured. 2+ Add 10mg / L FeSO 4 Absorbance at ...

experiment example 3、4

[0078] In order to confirm the removal of Fe 2+The color development of heavy metal ions other than , measured in the aqueous solution of 30mg / L agent 3 as Cu 2+ Add 20mg / L of CuSO 4 The spectrum at the time is shown in Figure 7 Medium (experimental example 3). In addition, in the aqueous solution of 30 mg / L drug 3, Fe 3+ Add 10mg / L of Fe 2 (SO 4 ) 3 The spectrum at the time is shown in Figure 8 Middle (experimental example 4).

[0079] As a result, it was confirmed that the Cu 2+ , Fe 3+ The case also reacts with agent 3 at about 460nm (Cu 2+ case) or 360nm (Fe 3+ case) produces a color development with a peak. And confirmed that when adding Al 3+ , Ca 2+ when, such as Figure 8 No color developed as shown.

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Abstract

The invention aims to provide an adding control method of heavy metal trapping agent. In the method, waste water containing heavy metal is processed by utilizing aminodithioformic acid heavy metal trapping agent and the adding dose of the heavy metal trapping agent can be suitable. It is characterized in that the aminodithioformic acid heavy metal trapping agent is added in the waste water containing heavy metal. After adding the aminodithioformic acid heavy metal trapping agent , heavy metal compound is added into processed water that is separated to make heavy metal ion react with aminodithioformic acid heavy metal trapping agent and display color, and the absorbance or transmissivity of 400 nm to 700 nm wavelength is measured. The adding volume of the aminodithioformic acid heavy metal trapping agent is controlled according to the measuring result.

Description

technical field [0001] The invention relates to a dosing control method of a heavy metal trapping agent, in particular to a heavy metal-containing trapping agent for removing heavy metal components in the waste water by adding a dithiocarbamate heavy metal trapping agent in the waste water containing heavy metals. The dosing control method of the dithiocarbamic acid heavy metal trapping agent in the wastewater treatment method. Background technique [0002] Wastewater containing heavy metals such as plating wastewater and painting wastewater is wastewater containing heavy metals such as copper, chromium, zinc, lead, manganese, iron, nickel, and cadmium. According to the "Water Pollution Control Law" etc., we are obliged to properly treat this waste water containing heavy metals. [0003] As a method for treating heavy metal-containing wastewater, a method of coagulation-sedimentation treatment is known by adding a chelate-based heavy metal scavenger mainly composed of a dit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/62G01N21/78
Inventor 渡边实河原林直也
Owner KURITA WATER INDUSTRIES LTD
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