Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for repairing Cr(VI)/As(V) compoundly polluted ground water by iron-based compound

A compound pollution and compound technology, which is applied in the direction of oxidized water/sewage treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of reducing the removal rate of zero-valent iron, and achieve low operating costs, high removal rate, and process simple effect

Inactive Publication Date: 2011-01-26
HARBIN INST OF TECH
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is the problem that zero-valent iron can greatly reduce the removal rate of As (V) due to the existence of Cr (VI) in the process of utilizing zero-valent iron to repair groundwater; Method of VI) / As(V) Compound Pollution of Groundwater

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for repairing Cr(VI)/As(V) compoundly polluted ground water by iron-based compound

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0010] Specific embodiment one: in this embodiment, the method for the iron-based compound to repair the groundwater polluted by Cr(VI) / As(V) complex is to use the osmotic reaction wall to process the groundwater polluted by Cr(VI) / As(V), wherein The wall material of the permeable reaction wall is Fe 0 Mixture with iron oxide, Fe 0 The mass ratio of iron oxide to iron oxide is 1:0.04-0.2.

[0011] In this embodiment, the removal rate of As(V) is 80%-95%, and the removal rate of Cr(VI) is 90%-99.8%.

[0012] Adding iron oxide in this method can not only greatly improve the adsorption and fixation capacity of As(V), but also relieve the Fe 0 The problem of reduced rate of degradation of Cr(VI).

specific Embodiment approach 2

[0013] Specific embodiment two: the difference between this embodiment and specific embodiment one is: Fe 0 The mass ratio of iron oxide to iron oxide is 1:0.05-0.1. Other steps and parameters are the same as those in Embodiment 1.

[0014] In this embodiment, the removal rate of As(V) is 80%-93%, and the removal rate of Cr(VI) is 90%-98%.

specific Embodiment approach 3

[0015] Specific embodiment three: the difference between this embodiment and specific embodiment one is: Fe 0 The mass ratio of iron oxide to iron oxide is 1:0.06. Other steps and parameters are the same as those in Embodiment 1.

[0016] In this embodiment, the removal rate of As(V) is 89%, and the removal rate of Cr(VI) is 95%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses to a method for using iron-based compound to repair ground water polluted by Cr (VI) / As (V), relating to the method for repairing ground water. The method solves the problem that in the process of using zero valence iron to repair the ground water, as Cr (VI) exists, the removal rate of the zero valence iron on As (V) is greatly reduced. The method uses the mixture of Fe <0> and a ferriferous oxide as a walling material of a permeable reactive barrier, or Fe (II) is separately added, or the Fe (II) and an oxidizer are added to repair the ground water polluted by Cr (VI) / As (V). The method has the advantages of simple technique, simple and convenient operation management, cheap and easily-available chemical medicine, low operation cost and high As (V) and Cr (VI) removing rate. The method realizes 80-98.8% of As (V) removing rate and 90%-99.8% of Cr (VI) removing rate.

Description

technical field [0001] The present invention relates to methods for remediating groundwater. Background technique [0002] The harm of chromium or arsenic pollution in groundwater to the environment and the impact on human health have aroused widespread concern. Remediation of chromium or arsenic-contaminated groundwater with zero-valent iron is an emerging in-situ remediation technology for groundwater in the past 20 years. Zero-valent iron remediation of groundwater polluted by Cr(VI) mainly utilizes the reducing ability of zero-valent iron, Cr(VI) will be deposited on the surface of zero-valent iron after being reduced by zero-valent iron, and zero-valent iron remediation is contaminated by As(V) In the case of underground water, the adsorption and co-precipitation of zero-valent iron corrosion products are mainly used. However, when As(V) and Cr(VI) coexist, although the presence of As(V) has little effect on the rate of degradation of Cr(VI) by zero-valent iron, due t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/72C02F101/22C02F1/62C02F1/58C02F1/70
Inventor 关小红董浩然马军
Owner HARBIN INST OF TECH