Method for applying heavy metal chelating agents

Abstract

The invention provides a method for applying heavy metal chelating agents. The method includes steps of 1, computing the dosage of the heavy metal chelating agents according to the content of heavy metal in to-be-treated water bodies and categories of corresponding complexing agents; 2, dissolving the heavy metal chelating agents to obtain heavy metal chelating agent solution; 3, adjusting PH (potential of hydrogen) values of the to-be-treated water bodies; 4, stirring the to-be-treated water bodies and simultaneously adding the heavy metal chelating agent solution obtained at the step 2 intothe to-be-treated water bodies; 5, filtering solution obtained at the step 4; 6, qualitatively detecting filtered solution to obtain the contents of the heavy metal and the heavy metal chelating agents; 7, adding coagulants into the solution obtained at the step 4; 8, adding flocculants into solution obtained at the step 7; 9, carrying out precipitation and acquiring supernatant liquid of solution. The method has the advantages that the method can adapt to strong-acidity or strong-alkalinity wastewater and is wide in application range and high in adsorption and flocculation capacity; process routes are high in efficiency and are simple, the method is convenient to operate and low in production cost, and conditions are easy to control.

Description

technical field [0001] The invention relates to the technical field of metal chelating agents, in particular to a method for using a heavy metal chelating agent. Background technique [0002] Heavy metal pollution refers to the environmental pollution caused by elements with significant biological toxicity such as Hg, Cd, Pb, Cr, and As, and general heavy metals with certain toxicity, such as Zn, Cu, Co, Ni, Sn and other elements and their compounds. It has the following characteristics: ①A small amount can produce significant toxic effects. Generally, heavy metals can produce toxic effects in the range of 1.0-10mg / L, and the range of significant toxicity is 0.001-0.1mg / L; ②It cannot be degraded by microorganisms. On the contrary, some heavy metals Under the action of microorganisms, it will be transformed into more toxic metal-organic substances, such as mercury into alkylmercury; ③ After being ingested by organisms, it will be gradually enriched by thousands of times in hi...

AI Technical Summary

Problems solved by technology

Because heavy metals are not easy to remove after being discharged into the environment, and accumulate in the environment, they will have long-term toxic effects on organisms