Biological leaching-solvent extraction-electrodeposition recovering method for heavy metal copper in sludge

A technology of biological leaching and recovery method, applied in the field of environmental engineering, can solve problems such as no reports, and achieve the effects of simple equipment, easy operation and high recovery rate

Inactive Publication Date: 2009-08-05
NANJING AGRICULTURAL UNIVERSITY
View PDF5 Cites 36 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, unlike metal ore and electroplating sludge, which are dominated by inorganic phases, the above-mentioned sludge contains a high amount of organic matter (30% to 60%). After bioleaching, will a large amount of water-soluble organic matter in the leachate be Affect the sel

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
  • Biological leaching-solvent extraction-electrodeposition recovering method for heavy metal copper in sludge
  • Biological leaching-solvent extraction-electrodeposition recovering method for heavy metal copper in sludge
  • Biological leaching-solvent extraction-electrodeposition recovering method for heavy metal copper in sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1 reclaims copper in the municipal sludge 1 of an industrial park in Suzhou

[0046] According to the technique mentioned in the present invention, according to flow process (see attached figure 1 ) to treat the urban sludge of an industrial park in Suzhou and recover the copper in it.

[0047] Copper dissolution stage by bioleaching: the microorganisms used in bioleaching are compound acidophilic thiobacteria (Acidithiobacillus thiooxidans TS6 and Acidithiobacillus ferrooxidans LX5); the solid content of the test sludge is 2.87%, the pH is 6.59, and the organic matter is 46%. Total copper 7432mg / kg (calculated as dry matter).

[0048] Add the compound acidophilic thiobacillus inoculum (the density of thiobacillus is about 108 CFU / mL) and the original sludge after domestication and enrichment culture into a 10L reactor at a volume ratio of 1:, and add sulfur powder, Ferrous iron is used as an energy source (the addition amount is 2.0g / L). Under the conditio...

Embodiment 2

[0051] Embodiment 2 reclaims the copper in the municipal sludge of an industrial park in Wuxi

[0052] According to the technique mentioned in the present invention, according to flow process (see attached figure 1 ) to treat the municipal sludge in an industrial park in Wuxi and recover the copper in it.

[0053] Copper dissolution stage by bioleaching: the microorganisms used in bioleaching are Acidithiobacillus thiooxidans TS6 and Acidithiobacillus ferrooxidans LX5; the solid content of the test sludge is 2.93%, pH6.56, organic matter 43%, total Copper 12750mg / kg (calculated as dry matter).

[0054] The compound acidophilic Thiobacillus inoculum (the density of Thiobacillus is about 10 8 CFU / mL) and the original sludge in a volume ratio of 1: add them to a 100L reactor, and add sulfur powder and ferrous iron as energy materials (the addition amount is 2.0g / L), under the condition of ventilation and aeration , stirring and mixing, so that the microorganisms can better act...

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 relates to a biological leaching, solvent extraction and electrowinning recovery method for heavy metal copper in sludge, and is a method of dissolving the copper from the sludge by biological leaching method, separating and enriching the copper in leaching solution by solvent extraction method, and recovering the metal coppe by electrowinning electroless plating copper technology, and is a harmless and resourceful treatment technology for municipal sludge and industrial sludge with higher copper content. Firstly, the biological acidization which lowers the ph value of a sludge system and oxygenizement of compound acidophilic thiobacillus under aerobic condition in the presence of energy matter are utilized to enable the heavy metal copper in the sludge to abundantly dissolved out from solid phase to liquid phase, so that the sludge can be harmless; secondly, the copper in the biological leaching solution is extracted by using a copper extractant M5640 so that the copper enters an organic phase, and then the copper is conducted back extractioin by using sulfuric acid so that the copper enters the water phase again so as to separate and enrich the copper; finally, the enriched copper solution is electrolyzed to causes the copper to be deposited, and the copper is recovered to be resourceful. The technique not only can remove the heavy metals in the sludge and kill pathogens, but also ensures that the treated sludge is easy to dehydrate and settle and the heavy metal copper dissolved out can be recovered to achieve the purposes of harmlessness, reduction and resource of the sludge.

Description

1. Technical field: [0001] The invention relates to a technology for recovering heavy metal copper in urban sludge, industrial sludge and silt while making the sludge harmless and reducing in volume, and belongs to the technical field of environmental engineering. 2. Technical background: [0002] Sludge from sewage treatment plants contains a large amount of organic matter and plant nutrients such as N and P, but it also enriches a large amount of heavy metals (50% to 80%) in sewage. According to reports, in some urban sewage treatment plants with a large proportion of industrial wastewater (especially from the machinery industry, IT industry and electroplating industry), the urban sewage sludge has a higher content of heavy metals, such as Cu can reach several Thousands or even tens of thousands of mg / kg. At the same time, sludge from some industrial enterprises, such as electroplating sludge, also contains a high amount of Cu. The high amount of heavy metals in sludge w...

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): C22B7/00C22B3/18C22B3/26C25C1/12C02F11/02C22B15/00
CPCY02P10/20Y02W10/20
Inventor 周立祥陈海平王世梅梁剑茹
Owner NANJING AGRICULTURAL UNIVERSITY
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