CN1385383A - Biological harmless pretreating method for waste computer - Google Patents
Biological harmless pretreating method for waste computer Download PDFInfo
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- CN1385383A CN1385383A CN02112156A CN02112156A CN1385383A CN 1385383 A CN1385383 A CN 1385383A CN 02112156 A CN02112156 A CN 02112156A CN 02112156 A CN02112156 A CN 02112156A CN 1385383 A CN1385383 A CN 1385383A
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- waste
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- nutrient solution
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/20—Sludge processing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/82—Recycling of waste of electrical or electronic equipment [WEEE]
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- Removal Of Specific Substances (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Activated Sludge Processes (AREA)
Abstract
The biological harmless method for pretreating circuit board of waste and old computer is characterized by that it utilizes the nutrients salt contained in sewage or sludge or nutrient salt solution prepared according thiobacterium culture medium and added element sulfur or ferrous salt to make the acidophilic microbial pool being in microbe obtain proliferation and produce sulfuric acid and organic acid under the aerobic condition, and utilizes the acidophilic microbial pool and produced acid to dissolve the heavy metal in the circuit board of waste and old computer, after 2-20 days, most of heavy metal of computer circuit board can be dissolved out.
Description
Technical field:
The present invention relates to a kind of biological harmless pretreating method for waste computer, be one and utilize the acidophilic bacteria group, belong to field of environment engineering technology the technology that waste and old computer carries out harmless treatment.
Background technology:
Along with the fast development of information technology, the upgrading of computer product is also more and more faster, and the waste and old computer that is eliminated is also more and more.At present, the processing of waste and old computer mainly contains landfill, store and method such as burning, and landfill, the shortcoming of storing are effective processing of the waste and old computer of realization that can not be real, in fact only play the effect of storage; Burning method running cost height, and since waste and old computer contain heavy metal such as lead, mercury, cadmium, silver thereby in treating processes, be easy to produce secondary pollutant.From the utilization of resources and point of view of environment protection, be badly in need of suitable waste and old Computer Processing method of disposal at present.The research of biological process (adopt and mix the acidophilic bacteria group) the waste and old computer of harmless treatment does not also have report at present.
Summary of the invention:
The purpose of this invention is to provide a kind of biological harmless pretreating method for waste computer, effectively the heavy metal in the stripping computer is recycled, and helps the protection of ecotope.
For realizing such purpose, adopt biological method in the technical scheme of the present invention, utilize to mix in the acidophilic bacteria group active procedure transforming sulfuric acid and the organic acid that produces, will be through the heavy metal stripping in broken and the waste and old computer that screening is handled, thus realize the innoxious of waste and old computer.
The present invention utilizes sewage or mud or by itself contained nutritive salt in the nutrition saline solution of thiobacillus substratum preparation and the elementary sulfur or the ferrous salt that add, under aerobic condition, make the acidophilic bacteria group in the microorganism obtain propagation and produce sulfuric acid and organic acid, by means of the acid of acidophilic bacteria group and generation thereof the heavy metal in the waste and old computer circuit board being carried out stripping handles, processing through 3～20 days can make the most of stripping of heavy metal in the waste and old computer circuit board.
Method of the present invention specifically comprises following steps:
1, domestication acidophilic bacteria group mixed-culture medium---producing of domestication liquid:
Get sewage that municipal wastewater treatment plant handles through settling pit or municipal wastewater treatment plant mud without dehydration, addition element sulphur, and under aerobic conditions, tame cultivation, and be lower than at 2.5 o'clock until the pH of sewage or mud value, promptly obtain required domestication acidophilic bacteria group mixed-culture medium.Perhaps, get sewage that municipal wastewater treatment plant handles through settling pit or municipal wastewater treatment plant mud without dehydration, adding sulfuric acid makes it be acidified to the pH value to be lower than 5.0, add ferrous salt (as ferrous sulfate) then and carry out aerobic domestication, when the pH of sewage or mud value is lower than 2.5, promptly obtain required domestication acidophilic bacteria group mixed-culture medium.Perhaps, get, add a small amount of sewage or mud, carry out aerobic domestication, obtain required domestication nutrient solution by the formulated nutrition saline solution that gets of common thiobacillus substratum.
2, producing of nutrient solution:
Get sewage that municipal wastewater treatment plant handles through settling pit or municipal wastewater treatment plant mud without dehydration, add 0.1%～1.0% elementary sulfur, or in sewage sludge, add earlier sulfuric acid and it is acidified to add a small amount of ferrous salt (as ferrous sulfate) again after the pH value is lower than 5.0, obtain nutrient solution; Perhaps, directly get by the formulated nutrition saline solution of common thiobacillus substratum as nutrient solution.
3, relieving haperacidity pre-treatment:
In the continuous flow biological reaction device, put into nutrient solution, get above-mentioned domestication liquid, render in the reactor, carried out air culture and supported, be lower than 2.5 until the pH of nutrient solution value with 0.1%～5% amount.
4, carry out continuous relieving haperacidity:
After when the pH of nutrient solution in bio-reactor value is lower than 2.5, begins to advance nutrient solution continuously in the reactor and carry out continuous relieving haperacidity.
5, the heavy metal stripping is handled:
Adopt ways such as precipitation, filtration or mechanical dehydration, to from bio-reactor, go out the sewage or the mud solid-liquid separation of stream, then parting liquid is introduced in the waste and old computer circuits sheet processor, the stripping of carrying out heavy metal through waste and old computer circuit board broken and that screening is handled is handled, and the treatment time is 3～20 days.
6, the supernatant liquor after the stripping processing is carried out aftertreatment:
Effusive supernatant liquor can carry out conventional physics and chemistry method (complexing, chemical precipitation, electrolysis or ion-exchange-resin process), biological process aftertreatment from reactor.The solid phase from sewage or mud or nutrition saline solution, separated part (with producing separable solid matter hardly in the nutrition saline solution relieving haperacidity process) in lime with after can do agricultural or other disposal; The waste and old computer residue that carries out after the heavy metal stripping is handled can be done disposal such as landfill.
Effect of the present invention is significant, with sewage or mud or cultivate nutritive salt itself that contain in the saline solution and the elementary sulfur or the molysite of interpolation is the long matrix of acidophilic bacteria all living creatures such as thiobacillus, the acidophilic bacteria group is bred in a large number, produce a large amount of sulfuric acid in the nutrient solution, the sulfuric acid that produces in this process is used for the stripping of waste and old computer to be handled, thereby realizes the innoxious pre-treatment of heavy metal in the waste and old computer.When wherein being the long nutritive salt source of acidophilic bacteria all living creatures with sewage or mud, processing cost is lower, and when being the nutritive salt source with the nutrition saline solution by the preparation of thiobacillus substratum, processing cost is high, but initially acidificatoin time is fast.
Sewage or mud are the environmental pollutant that need infusion of financial resources to handle originally, but the acidophilic bacteria group of wherein containing original inhabitants, the present invention utilizes this point just and in conjunction with acidophilic bacteria group's physilogical characteristics, breeds and relieving haperacidity, with the acid of gained waste and old computer heavy metal is carried out stripping and handles; Handle with the relieving haperacidity that the nutrition saline solution carries out, though its cost is high than sewage or mud, but still a kind of way with low cost of can yet be regarded as; The present invention not only can make the surface-mounted integrated circuit of waste and old computer, refuse battery and other machines rationally be disposed, also recyclable heavy metal wherein.The present invention has avoided simple landfill to take up an area of and can not obtain in fact the shortcoming of decrement, compares with burning method, and operation at normal temperatures, running cost is low, easy to operate, operating environment is friendly; The heavy metal result of extraction can reach more than 50～80% after handling 3 days, handles after 6 days, can reach more than 80～96%.As the sewage of material or mud or cultivate the residue (with nutrition saline solution relieving haperacidity process in hardly produce separable solid matter) of saline solution after solid-liquid separator is handled in lime and after can be used as the fertile disposal of farming, heavy metal content wherein can reach the agricultural quality standard of mud (GB4248-84) fully.
Description of drawings:
Accompanying drawing 1 is a process flow sheet of the present invention.
As seen from the figure, the device of technological process employing of the present invention is mainly by bioreactor 1, Separation of Solid and Liquid Device 2, waste computer processor 3, aerator 4, sewage or mud or nutrition saline solution inlet tube 5, living On in thing reactor mixed liquor delivery line 6, parting liquid delivery line 7, solid residue delivery line 8, the processor Stirring and the aerator installed on clear liquid delivery line 9, waste computer residue delivery line 10, the processor 3 11 and bioreactor mixed solution return duct 12 form. Its operating procedure is that nutrient solution is pressed continuously The stream mode import to its material (sewage or mud or nutrition saline solution) acidifying be pH be lower than 2.0 reaction In the device 1, and carry out continuous aeration by aerator 4, simultaneously with the mixed liquor in the reactor by mixed liquor Delivery line 6 is derived, and carries out Separation of Solid and Liquid through solid-liquid separator 2 and processes, and the gained parting liquid is derived by parting liquid Pipe 7 is introduced in the waste computer processor 3 of break process, carries out waste computer under stirring condition The lixiviate of heavy metal and stripping are processed; Sewage or sewage sludge solid residue are derived by delivery line 8; Broken worn-out Computer is after stripping is processed, and residue is derived by delivery line 10, and supernatant is undertaken by delivery line 9 derivation The heavy metal recycling of conventional method. The setting of return duct 12 is that the part reuse goes out to flow in the mixed liquor Thiobacillus is with the stability of enhancement system operation.
Embodiment:
Below in conjunction with specific embodiment technical scheme of the present invention is further described.
Get Shanghai Sewage Plant settling pit water outlet, add acclimation sludge by the amount that adds 5%, the elementary sulfur that adds 0.1% (w/v) again, carrying out aeration in bio-reactor 1 cultivates, after its pH is lower than 2.5, advance sewage (ratio in 1% (w/v) adds elementary sulfur) continuously, after effusive mixed solution advanced centrifugal treating, its parting liquid is used for the discarded unicircuit of lixiviate computer network interface card to be handled.Discarded unicircuit can make lead, mercury, cadmium, copper, silver in the discarded unicircuit that 32%, 62%, 72%, 64% stripping is arranged respectively after handling in 3 days.After handling in 6 days, can make lead, mercury, cadmium, copper, silver in the computer network interface card that 43%, 68%, 81%, 76% stripping is arranged respectively.
Embodiment 2
Get Shanghai Sewage Plant solid content and be 2.7% liquid sludge, amount by 1% is sneaked into acclimation sludge, add 1.0% elementary sulfur (w/v) again, carrying out aeration in bio-reactor 1 cultivates, after its pH is lower than 2.5, advance mud (ratio in 1% (w/v) adds elementary sulfur) continuously, the mud extraction parting liquid is used for waste and old computer circuit board.Waste and old computer circuit board can make wherein mercury, cadmium, copper that 58%, 61%, 78% stripping is arranged respectively after handling in 6 days.Handle after 20 days, can make mercury, cadmium, copper in the waste and old computer circuit board that 86%, 77%, 93% stripping is arranged respectively.As the mud of material after solid-liquid separator is handled in lime and after can be used as that farming is fertile to be disposed, heavy metal content wherein can reach the agricultural quality standard of mud (GB4248-84) fully.
Get Shanghai Sewage Plant solid content and be 2.7% liquid sludge, after amount with 5% adds acclimation sludge, carry out aerobic treatment by 0.1% amount addition element sulphur again, after pH is lower than 2.5, advance mud (ratio in 0.1% (w/v) adds ferrous sulfate) continuously, the mud extraction parting liquid is used for waste and old computer circuit board.Waste and old computer circuit board can make wherein mercury, cadmium, copper that 47%, 62%, 71% stripping is arranged respectively after handling in 6 days.Handle after 20 days, can make mercury, cadmium, copper in the waste and old computer circuit board that 76%, 68%, 87% stripping is arranged respectively.As the mud of material after solid-liquid separator is handled in lime and after can be used as that farming is fertile to be disposed, heavy metal content wherein can reach the agricultural quality standard of mud (GB4248-84) fully.
Embodiment 4
Cultivation saline solution by common thiobacillus substratum preparation, amount by 0.1% adds acclimation sludge, and by the amount addition element sulphur of 1.0% (w/v), carrying out aeration in bio-reactor 1 cultivated after 12 days, advance to cultivate saline solution (ratio in 1% (w/v) adds elementary sulfur) continuously, effusive mixed solution (almost separating less than solid matter with conventional solid-liquid isolation method) is used for the waste and old computer circuit board of lixiviate to be handled.Waste and old computer circuit board can make wherein mercury, cadmium, silver that 73%, 61%, 64% stripping is arranged respectively after handling in 3 days.After handling in 6 days, can make mercury, cadmium, silver in the waste and old computer circuit board that 88%, 91%, 79% stripping is arranged respectively.
Claims (3)
1, a kind of biological harmless pretreating method for waste computer is characterized in that comprising the following step:
1) producing of domestication liquid: get sewage that municipal wastewater treatment plant handles through settling pit or municipal wastewater treatment plant mud without dehydration, addition element sulphur, and under aerobic conditions, tame cultivation, be lower than 2.5 until the pH of sewage or mud value, add ferrous salt again after perhaps adding sulfuric acid makes its pH value be lower than 5.0 earlier in sewage sludge and carry out aerobic domestication, be lower than 2.5 until the pH of sewage sludge value, perhaps get by the formulated nutrition saline solution of common thiobacillus substratum and add a small amount of sewage or mud carries out aerobic domestication;
2) producing of nutrient solution: get sewage that municipal wastewater treatment plant handles through settling pit or municipal wastewater treatment plant mud without dehydration, add 0.1%～1.0% elementary sulfur, or in sewage sludge, add earlier sulfuric acid and it is acidified to add a small amount of ferrous salt again after the pH value is lower than 5.0, perhaps directly get by the formulated nutrition saline solution of common thiobacillus substratum as nutrient solution;
3) relieving haperacidity pre-treatment: in the continuous flow biological reaction device, put into nutrient solution, get above-mentioned domestication liquid, render in the reactor, carried out air culture and supported, be lower than 2.5 until the pH of nutrient solution value with 0.1%～5% amount;
4) carry out continuous relieving haperacidity: after when the pH of nutrient solution in bio-reactor value is lower than 2.5, begins to advance nutrient solution continuously in the reactor and carry out continuous relieving haperacidity;
5) the heavy metal stripping is handled: adopt precipitation, filtration or mechanical dehydration way, to from bio-reactor, go out the sewage or the mud solid-liquid separation of stream, then parting liquid is introduced in the waste and old computer circuits sheet processor, the stripping of carrying out heavy metal through waste and old computer circuit board broken and that screening is handled is handled;
6) supernatant liquor after the stripping processing is carried out aftertreatment;
2,, it is characterized in that the ferrous salt that acidifying is adopted is a ferrous sulfate as the said biological harmless pretreating method for waste computer of claim 1.
3,, it is characterized in that post-treating method adopts biological process, complexing, chemical precipitation, electrolysis or ion-exchange-resin process as the said biological harmless pretreating method for waste computer of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN02112156A CN1385383A (en) | 2002-06-20 | 2002-06-20 | Biological harmless pretreating method for waste computer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN02112156A CN1385383A (en) | 2002-06-20 | 2002-06-20 | Biological harmless pretreating method for waste computer |
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| Publication Number | Publication Date |
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| CN1385383A true CN1385383A (en) | 2002-12-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN02112156A Pending CN1385383A (en) | 2002-06-20 | 2002-06-20 | Biological harmless pretreating method for waste computer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101962712A (en) * | 2010-10-15 | 2011-02-02 | 华南理工大学 | Method for leaching valuable metals in waste circuit board by acidophilic bacteria mixed culture |
| CN105923964A (en) * | 2016-06-20 | 2016-09-07 | 上海交通大学 | Novel efficient sludge dewatering conditioner and application thereof |
| CN106914470A (en) * | 2011-12-15 | 2017-07-04 | 恩特格里斯公司 | For the apparatus and method for recycling period stripping solder metal in discarded Electrical and Electronic equipment |
-
2002
- 2002-06-20 CN CN02112156A patent/CN1385383A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101962712A (en) * | 2010-10-15 | 2011-02-02 | 华南理工大学 | Method for leaching valuable metals in waste circuit board by acidophilic bacteria mixed culture |
| CN106914470A (en) * | 2011-12-15 | 2017-07-04 | 恩特格里斯公司 | For the apparatus and method for recycling period stripping solder metal in discarded Electrical and Electronic equipment |
| CN105923964A (en) * | 2016-06-20 | 2016-09-07 | 上海交通大学 | Novel efficient sludge dewatering conditioner and application thereof |
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