In-situ arsenic removing method of reductive underground water based on sulfate

A groundwater and sulfate technology, applied in chemical instruments and methods, water/sewage treatment, adsorbed water/sewage treatment, etc., can solve the problems of large volume, high cost, difficult to identify, etc., and achieve high arsenic removal efficiency and technology. simple effect

Inactive Publication Date: 2015-07-22
CHINA UNIV OF GEOSCIENCES (WUHAN)
View PDF5 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above technologies often have problems such as large-scale excavation, unsatisfactory repair effect, and relatively high cost.
Naturally occurring high-arsenic groundwater is characterized by wide distribution, large volume, and difficulty in identifying pollution sources and pollution pathways, making it difficult to implement the above methods in engineering practice and application promotion.

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
  • In-situ arsenic removing method of reductive underground water based on sulfate
  • In-situ arsenic removing method of reductive underground water based on sulfate
  • In-situ arsenic removing method of reductive underground water based on sulfate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0036] Such as Figure 1-2 As shown, an in-situ arsenic removal method for groundwater based on sulfate reduction includes the following steps:

[0037] (1) Determine the working area, clarify the local hydrogeological and hydrochemical conditions of the working area, select the target high arsenic aquifer 1; determine the following parameters of the aquifer: aquifer thickness B (m), permeability coefficient K (m / d), effective porosity n e , Water storage coefficient S, regional hydraulic gradient I, regional groundwater velocity U (m / d), dispersion coefficient (m 2 / s), and determine the direction of groundwater flow;

[0038] (2) According to the hydrogeological parameters of the existing aquifer and the actual pumping volume, the work area is further divided into several work area unit units (or hydraulic capture areas). The work area units are the further division of the work area to facilitate the use of the following steps To carry out the restoration work with the calculat...

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

PropertyMeasurementUnit
pore sizeaaaaaaaaaa
Login to view more

Abstract

The invention relates to an arsenic removing method, particularly to an in-situ arsenic removing method of underground water based on a reducing action of a sulfate (ferrous sulfate), and belongs to the technical field of underground water in-situ remediation. The method comprises: selecting FeSO4 as a basic arsenic removing agent; periodically injecting a ferrous sulfate agent; making a partial flow field by utilizing a pumping well to lead the agent to be diffused and to react; and prompting injected FeSO4 and sulfide widely present in a high-arsenic content aquifer to be subjected to a reduction-precipitation reaction through mediation of indigenous microorganism to generate a stable and uniform iron sulfide (the main mineral morphologies of which are mackinawite (FeS) and iron pyrite (FeS2)). On one side, the arsenic concentration in the underground water is reduced by the resultant iron sulfide through an absorption and co-precipitation action, on the other side, the resultant iron sulfide can form a dense iron plating layer on the surface of the precipitation, so that release of solid arsenic can be controlled from the source.

Description

Technical field [0001] The invention relates to a method for removing arsenic, in particular to an in-situ method for removing arsenic from groundwater based on sulfate (ferrous sulfate) reduction, and belongs to the technical field of groundwater in-situ restoration. Background technique [0002] Arsenic is a toxic metal element, and chromium, cadmium, mercury, lead, etc. are listed as one of the five poisons of heavy metals. Long-term exposure to high arsenic environments will cause various diseases such as the digestive system and nervous system, and may cause many kinds of cancer. Drinking high-arsenic groundwater is one of the main ways arsenic enters the human body. High-arsenic groundwater is distributed in more than 70 countries around the world, affecting more than 150 million people. Take my country as an example. Statistics in 2002 showed that high-arsenic groundwater was found in 8 provinces and cities, and the population exposed to high-arsenic reached 2 million. ...

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 Applications(China)
IPC IPC(8): C02F1/28C02F1/52C02F1/62
Inventor 谢先军王志强皮坤福柳亚清朱亚鹏马腾苏春利丁贞玉郝义国王焰新
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap