Arsenic removal method through combination of oxychlorination, ferric salt flocculation and microfiltration

A technology of ferric oxychloride and ferric oxide, which is applied in the field of water treatment, can solve the problems of long hydraulic retention time, complicated operation, and large floor area, and achieve high utilization rate of water resources, simple and convenient operation, and high degree of automation Effect

Inactive Publication Date: 2011-08-31
TIANJIN UNIV
View PDF3 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coagulation-sedimentation method requires a long hydraulic retention time and occupies a large area. For source water with a high concentration of arsenic, it is difficult to meet the current drinking water hygiene standards after treatment.
The arsenic removal efficiency of the adsorption method is low, and the adsorbent needs to be frequently regenerated, the operation is complicated, and a large amount of cleaning waste liquid is discharged
The ion exchange method

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
  • Arsenic removal method through combination of oxychlorination, ferric salt flocculation and microfiltration
  • Arsenic removal method through combination of oxychlorination, ferric salt flocculation and microfiltration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] The method steps of the present invention will be further described below through specific examples. At the same time, this embodiment is descriptive, not restrictive, and cannot limit the protection scope of the present invention.

[0018] Chlorine oxidant oxidation, iron salt coagulation and hollow fiber membrane filtration are used to purify and remove arsenic. The nominal pore size of the hollow fiber membrane is 0.2μm, and the effective area is 0.5m 2 . The effective volume of the coagulation reactor is 2.5L, the gas-water ratio is 5:1, and the hydraulic retention time is 15min. The effective volume of the membrane separator is 7.5L, the gas-water ratio is 10:1, and the hydraulic retention time is 45min. In the present embodiment, the chlorine oxidizing agent adopts sodium hypochlorite; the iron salt adopts ferric chloride.

[0019] The specific method of purification and removal of arsenic is completed by the following steps:

[0020] (1) When the source water...

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 an arsenic removal method through combination of oxychlorination, ferric salt flocculation and microfiltration, which is used for removing arsenic in drinking water and comprises the following steps: adding ferric oxychloride and ferric salt into a flocculation reactor, providing certain flocculation action in an aeration or mechanical stirring manner, and oxidizing arsenic (III) into arsenic (V) by means of the oxychlorination agent; and meanwhile, enabling the hydrolysate of the ferric salt and arsenic (V) in raw water to form floccules, and separating by using a hollow fiber membrane to achieve the purpose of removing the arsenic. The arsenic removal method has the following benefits: a right amount of oxychlorination agent and ferric salt are added into an arsenic-containing water source, so that the residual arsenic and ferric content in the treated water can meet the requirements of sanitary standards for drinking water, thus being of great importance in reducing the incidence rate of drinking water type arsenic poisoning in China. A hollow fiber microfiltration membrane assembly can be designed into a fixed type or a mobile type as required, and the design scale can be flexibly selected so as to be applicable to emergent water supply for rural and remote regions and field water supply or emergency.

Description

technical field [0001] The invention belongs to water treatment technology, and in particular relates to using groundwater or surface water as a water source to remove arsenic in drinking water production. Background of the invention [0002] Arsenic, including elemental substances and most compounds, is highly toxic, carcinogenic, mutagenic, and teratogenic to animals. Drinking water high in arsenic for a long time can cause various cancers and inflammations, and it has been identified as a first-class carcinogen by the US Center for Disease Control and the International Agency for Research on Cancer. my country's high-arsenic water areas involve about 30 counties (banners) in 10 provinces (regions) including Taiwan, Xinjiang, Inner Mongolia, and Tibet, and the exposed population is as high as 15 million. Drinking water-type arsenic poisoning has become a major endemic disease in my country. my country's current "Drinking Water Hygienic Standards" (GB 5749-2006) stipulates...

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
IPC IPC(8): C02F9/04
Inventor 张光辉顾平
Owner TIANJIN UNIV
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