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Method for removing complexing agent of Hg (II) from water by using strengthened manganese oxide

A manganese oxide and water removal technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Low cost, high mercury removal efficiency, flexible and convenient operation

Active Publication Date: 2014-06-11
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of the extremely low removal rate of Hg(II) in the prior art, and provide a method for strengthening the complexing agent of manganese oxide to remove Hg(II) in water

Method used

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  • Method for removing complexing agent of Hg (II) from water by using strengthened manganese oxide

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specific Embodiment approach 1

[0013] Specific implementation mode one: a kind of method of strengthening manganese oxide to remove the complexing agent of Hg(II) in water according to the present embodiment is realized according to the following steps: 1. Add complexing agent to water containing Hg(II), and then throw Add an adsorbent, then stir and react at a speed of 100-350r / min for 1-60min to obtain a mixed solution; 2. Add a coagulant to the mixed solution obtained in step 1, and then go through conventional water treatment processes for coagulation, filtration, After precipitation and clarification, the complexing agent for strengthening manganese oxide to remove Hg(II) in water is completed;

[0014] The molar ratio of the complexing agent to Hg in the first step is 2-10000:1; the dosage of the adsorbent is 1-50 mg / L in terms of manganese; the dosage of the coagulant in the second step is 10 mg / L.

specific Embodiment approach 2

[0015] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the complexing agent described in step one is sodium thiosulfate. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0016] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the adsorbent described in step 1 is new ecological iron manganese or nano new ecological manganese. The preparation method of new ecological iron and manganese is the solid matter obtained by permanganate oxidation of ferrous sulfate or ferrous chloride; The resulting solid material. Other steps and parameters are the same as in the first or second embodiment.

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Abstract

The invention discloses a method for removing a complexing agent of Hg (II) from water by using a strengthened manganese oxide, and in particular relates to a strengthened removal method for Hg (II) in water to solve the problem of extremely low removal rate in the existing method for removing the Hg (II). The method comprises the steps of 1, adding a complexing agent A into the water containing Hg (II), then adding an adsorbent B or C, and stirring to obtain a mixed solution; 2, adding a coagulant into the mixed solution, and then sequentially performing coagulation, filtration, precipitation and clarification of a conventional water treatment process. According to the method, by using the complexing agent A, the properties of the adsorbent and Hg can be changed simultaneously, and the trace Hg (II) in a drinking water source can reach the provision of Drinking Water Sanitary Standard (GB5749-2006) when water is discharged from a water plant; by adopting the method disclosed by the invention, the mercury removal efficiency is up to more than 99%; the method is simple, flexible and convenient to operate, does not change the original treatment process of the water plant, and is low in running cost. The method disclosed by the invention is applied in the field of sewage and wastewater treatment.

Description

technical field [0001] The present invention relates to a method for enhancing the removal of Hg(II) in water. Background technique [0002] Mercury, commonly known as "mercury", is silvery white with a metallic luster and is the only liquid metal at room temperature. Mercury, as a highly toxic pollutant to human body and higher organisms, is ubiquitous in nature. The problem of environmental mercury pollution caused by mercury and its compounds is becoming more and more serious, and has become a major public hazard to the human living environment. Mercury pollution in drinking water is mainly the pollution of drinking water sources, the main ways: the discharge of mercury-containing wastewater; mercury leakage caused by unreasonable disposal and stacking of mercury-containing waste; mercury mine areas and areas with severe mercury pollution are caused by the dissolution and erosion of rainwater pollution of water sources; release of mercury from sediments of rivers and la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 马军路希鑫皇甫小留
Owner HARBIN INST OF TECH
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