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Harmless biological pretreating method of waste battery

A biological pretreatment and waste battery technology, applied in the field of environmental engineering, can solve problems such as secondary pollutants, unfriendly environmental conditions, and high operating costs

Inactive Publication Date: 2002-01-23
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, there are dominant recovery methods such as thermal pretreatment and acid pretreatment for the recycling of waste batteries. The disadvantages of these methods are high operating costs, unfriendly environmental conditions, and easy to produce secondary pollutants during the treatment process.
Although there are occasional reports on the biological harmless treatment of waste batteries, they still cannot get rid of the practice of acidification treatment first, and from the few reports that have been reported, the microorganisms used are only certain strains provided with a specific medium. Research on the effect of using

Method used

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  • Harmless biological pretreating method of waste battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take the effluent from the grit chamber of a sewage plant in Shanghai, add 1% (w / v) elemental sulfur, carry out aerated culture in bioreactor 1 for 22 days, and then continuously enter the sewage (already according to the ratio of 1% (w / v) Adding elemental sulfur), the outflowing mixed solution is centrifuged, and the separated solution is used for leaching nickel-cadmium batteries and carbon-zinc batteries. After 3 days of treatment of waste battery content, 58%, 51%, and 76% of nickel, cadmium, and zinc in nickel-cadmium batteries and carbon-zinc batteries can be dissolved out, respectively. After 6 days of treatment, 88%, 83%, and 94% of nickel, cadmium, and zinc in nickel-cadmium batteries and carbon-zinc batteries can be dissolved respectively.

Embodiment 2

[0022] Take the liquid sludge with a solid content rate of 2.7% from a sewage plant in Shanghai, add 1% elemental sulfur (w / v), carry out aeration culture in the bioreactor for 22 days, and then feed the sludge continuously (according to 1% (w / v) / v) ratio to add elemental sulfur), and the sludge separation liquid is used for leaching nickel-cadmium batteries and carbon-zinc batteries. After 3 days of treatment of waste battery contents, 62%, 57%, and 81% of nickel, cadmium, and zinc in nickel-cadmium batteries and carbon-zinc batteries can be dissolved respectively. After 10 days of treatment, 93%, 81%, and 96% of nickel, cadmium, and zinc in nickel-cadmium batteries and carbon-zinc batteries can be dissolved respectively. The lime can be used as agricultural fertilizer after neutralization, and the heavy metal content in it can fully meet the agricultural sludge quality standard (GB4248-84).

Embodiment 3

[0024] According to the culture salt solution prepared by common Thiobacillus culture medium, add the elemental sulfur of 0.25% (w / v), carry out aerated culture in bioreactor after 12 days, continuously enter culture salt solution (by 0.25% (w / v) v) ratio of elemental sulfur), the outflowing mixed solution (almost no solid phase material can be separated by conventional solid-liquid separation method) is used for leaching nickel-cadmium batteries and carbon-zinc batteries. After 3 days of treatment of waste battery contents, 76%, 63%, and 82% of nickel, cadmium, and zinc in nickel-cadmium batteries and carbon-zinc batteries can be dissolved out, respectively. After 6 days of treatment, 91%, 89%, and 96% of nickel, cadmium, and zinc in nickel-cadmium batteries and carbon-zinc batteries can be dissolved respectively.

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Abstract

In sewage, sludge or nutritious salt solution compounded for thiobacilli culture medium, element S in the amount of 0.2-1 % is thrown and in the aerobic condition inside the reactor, thiobacilli are made to proliferate and sulfuric acid is produced. Mixed liquid led out is separated from solid-liquid and then led into the waste battery matter treater for the heavy metal digestion treamtent of inside matter of waste battery. The process is carried out in normal temperature, needs no acid pre-treatment, and may be operated continuous and is simple, environment friendly and low in cost. After treatment of 3-6 days, the heavy metal in waste battery matter may be digested mostly.

Description

Technical field: [0001] The invention relates to a harmless biological pretreatment method for waste batteries, which is a technology for harmless treatment of waste batteries by using Thiobacillus, and belongs to the technical field of environmental engineering. Background technique: [0002] At present, there are dominant recovery methods such as thermal pretreatment and acid pretreatment for the recycling of waste batteries. The disadvantages of these methods are high operating costs, unfriendly environmental conditions, and easy to produce secondary pollutants during the treatment process. Although there are occasional reports on the biological harmless treatment of waste batteries, they still cannot get rid of the practice of acidification treatment first, and from the few reports that have been reported, the microorganisms used are only certain strains provided with a specific medium. A study of the effects of use. (C. Cerruti, G. Curutchet, E. Donati. Bio-dissolution...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61L11/00B09B5/00H01M6/52H01M10/54
CPCY02E60/12Y02W30/84
Inventor 朱南文贾金平王士芬
Owner SHANGHAI JIAO TONG UNIV