Method for quickly and efficiently removing heavy metals in water body

A technology for heavy metals and water bodies, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve problems such as poor environmental friendliness, affecting As removal effect, high price, etc., to achieve low price and low cost Expensive, low-cost effects

Active Publication Date: 2015-01-14
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the decomposition of persulfate may produce secondary pollutants such as sulfur dioxide and sulfate ions. Sulfate ions compete with As for the adsorption sites in an obligatory adsorption manner, which affects the removal effect of As.
The use of persulfate is easy to cause safety problems, it has certain toxicity, poor environmental friendliness, and the price is relatively expensive

Method used

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  • Method for quickly and efficiently removing heavy metals in water body
  • Method for quickly and efficiently removing heavy metals in water body
  • Method for quickly and efficiently removing heavy metals in water body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: Zero-valent iron / H 2 o 2 Filter column to remove As

[0026] The removal of As(V) was carried out in a 18×400mm plexiglass column. Take 100g of iron sand (particle size 1mm) and fill it in a glass column (the bottom of the column is filled with 1cm glass wool), and then quickly inject 200ml of 10mM H from the top. 2 o 2 Solution, this step is the initialization of the experiment, and then the As(V)-containing raw water is introduced. The As(V)-containing solution in the experiment uses tap water as the raw water background, and sodium asate is added to adjust the As(V) concentration to 200 μg / L , while adding hydrogen peroxide (H 2 o 2 ) adjusted to H in water containing As(V) 2 o 2 The concentration is 0.1mM, the influent water flows in from the top of the adsorption column, about 7.5 empty bed volume (BV) / hour, and the empty bed contact time (HRT) is 8min. Take a certain volume of effluent at regular intervals to measure the concentration of As(V...

Embodiment 2

[0028] Example 2: Zero-valent iron / NaClO filter column simultaneously removes As, Sb, Cd, and Hg

[0029] In the heavy metal (As, Sb, Cd, Hg) removal experiment, the heavy metal polluted water body used tap water as the raw water background, and sodium arsenate, potassium pyroantimonate, cadmium chloride, and mercury chloride were added to adjust the concentration to 200 μg / L. The filling and initialization of the reaction column are the same as in Example 1. Pass into the polluted water body that contains heavy metal then, add sodium hypochlorite (NaClO) in the liquid, concentration is 0.5mM, the flow velocity of water is with embodiment 1, gets certain volume effluent liquid at regular intervals, measures four kinds of heavy metals, iron concentration and pH value. Heavy metal removal and effluent pH value such as figure 2 As shown, As and Hg have maintained a very high removal rate, and the removal rate has reached 99-100%. After the outflow volume reaches 3000BV, there ...

Embodiment 3

[0030] Embodiment 3: Zero-valent iron / KMnO 4 Filter column removes As, Sb, Cd, Hg at the same time

[0031] The filling, initialization, raw water configuration, and influent flow rate of the filter column are the same as in Example 2, and the influent KMnO 4 The concentration is 0.5mM. The heavy metal removal effect and the pH value of the effluent are as follows image 3 shown. with zero valent iron / H 2 o 2 , Zero-valent iron / NaClO filter system is similar, As, Hg has maintained a very high removal rate, reaching 99-100%, after the outflow volume reaches 1000BV, there is no sign of breakthrough (column experiment is still in progress); Cd The removal effect of Sb also remains good, followed by the removal effect of Sb, which is maintained at about 75%.

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Abstract

The invention relates to a method for removing heavy metals in a water body, which is characterized in that common oxidizers for water treatment, such as hydrogen peroxide, sodium hypochlorite, potassium permanganate and the like, are utilized for oxidization to activate the zero-valent iron surface and continuously generate fresh iron (III) / (II) (hydro)oxide and other active components, thereby quickly and efficiently removing heavy metals in the water body, including As, Hg, Cd, Pb, Cr, Se, Sb, Cu, Zn and the like, in a mode of adsorption, precipitation, redox or the like.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and specifically relates to a method of activating the surface of zero-valent iron by using an oxidant commonly used in water treatment to continuously produce fresh iron (III) / (II) (hydroxide) oxides through adsorption, precipitation, redox, etc. A fast and efficient method for removing heavy metals from water. Background technique [0002] With the rapid development of economy, water pollution in my country is becoming more and more serious, among which heavy metal pollution is particularly prominent, and the heavy metal pollution rate of rivers, lakes, and reservoir bottoms is as high as 81%. The survey results of the water environment of my country's seven major water systems show that in 2003, the pollution levels of heavy metal-exceeding sections in ten river basins including the Yellow River, Huaihe River, Songhua River, and Liaohe River were all above Class V. As pollution of wat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/62C02F1/28C02F1/52C02F1/70C02F9/04
CPCC02F1/28C02F1/52C02F1/62C02F1/70C02F9/00B01J20/02B01J20/06B01J20/08B01J20/10B01J20/165B01J20/18B01J20/20C02F1/281C02F1/283C02F1/5236C02F1/705C02F1/722C02F1/76C02F2101/20C02F2101/22
Inventor 郭学军杨喆
Owner BEIJING NORMAL UNIVERSITY
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