CN105731749A - Method of removing heavy metal Cd in sludge through bioleaching - Google Patents
Method of removing heavy metal Cd in sludge through bioleaching Download PDFInfo
- Publication number
- CN105731749A CN105731749A CN201610148879.3A CN201610148879A CN105731749A CN 105731749 A CN105731749 A CN 105731749A CN 201610148879 A CN201610148879 A CN 201610148879A CN 105731749 A CN105731749 A CN 105731749A
- Authority
- CN
- China
- Prior art keywords
- sludge
- mud
- bioleaching
- heavy metals
- removes heavy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method of removing heavy metal Cd in sludge through bioleaching and belongs to the field of municipal solid waste treatment.The method includes: before leaching, pre-acidifying part of the sludge, controlling temperature to 28-30 DEG C and dissolved oxygen to 3-5 mg/L, adding a matrix Na2S2O3 into the sludge for culture to enable pH to be 1.5-2.5, and mixing with to-be-treated sludge for bioleaching for 8-10 days; retaining 15%wt-25%wt of leached sludge as inoculating liquid for next-time cycle, and discharging rest sludge; in the treatment process afterwards, retaining part of the leached sludge of the previous time as inoculating liquid to be circulated in the next-time treatment process, wherein the sludge does not need to be acidified any more.The method is low in energy consumption, acid consumption and treatment cost and high in removal rate of metal Cd, the removal rate is up to 81-85%, treated sludge meets sludge agricultural standards of China, extra strains are not needed, and the method is simple and convenient to operate.
Description
Technical field
The present invention relates to the process field of municipal solid wastes, be specifically related to a kind of method that bioleaching removes Heavy Metals in Sludge Cd.
Background technology
Sewage plant sludge belongs to the by-product of sewage disposal, and substantial amounts of pathogen, antibacterial etc. are contained in the inside, if untreated meeting causes serious environmental problem.The processing method of mud includes landfill, burn, throw sea, Land_use change etc., but the substantial amounts of soil of landfill needs, and environmentally safe there is hidden trouble.The cost burned is too big, the problem that also can cause atmospheric pollution, and throws sea and forbidden by international community already.Containing substantial amounts of nitrogen, phosphorus, Organic substance etc. in mud, if it is possible to being utilized by recycling sludge, the economic benefit of generation will be huge.
Along with expanding economy, the treating capacity of annual sewage gets more and more, and the sludge quantity of generation also increases gradually.By the end of 2012, it was the mud of 80% that China creates more than 20,000,000 tons of moisture content.Containing substantial amounts of trace element, Organic substance etc. in these mud, the prospect of Land_use change is huge.In the process of sewage disposal, in sewage, the heavy metal of more than half can enter in mud, causes that having a certain amount of heavy metal (copper, zinc, cadmium, lead, chromium etc.) in mud exists.Different local, different disposal techniques, the content of beary metal in mud there are differences.The content of some areas sludge heavy-metal substantially exceeds " urban wastewater treatment firm pollutant emission standard " (GB18918-2002) standard limited value.These heavy metals can be absorbed by plants, and enters human body enrichment by food chain, eventually the health of human body is caused serious harm.
The removal technology of heavy metal includes vegetation repair method, chemical method, electric repairing technique, bioleaching etc..Vegetation repair method handling is low, simple to operate, but a kind of or a few heavy metal are only had enrichment by plant, and the plant being enriched plurality of heavy metal is also required to process, and not so can cause environmental pollution；Chemical method is exactly utilize various acid by the landfill in mud to solution, then solid-liquid separation again, heavy metal in solution does further process again, chemical method removes the respond well of the heavy metal in mud, owing to mud is carried out acidifying, it is necessary to substantial amounts of reagent, the acid solution after simultaneously processing is also required to neutralize, the Capability Requirement of corrosion protection of equipment is high, and reagent cost and equipment cost are relatively larger；The time that electric repairing technique processes, clearance short, heavy metal was high, but power consumption is big, and the sludge quantity every time processed is limited, generally can with other treatment technology coupling, and application is restricted；Bioleaching technology is the effect utilizing microorganism direct or indirect, in the landfill in mud to solution, then through mud-water separation, will reach the purpose that sludge heavy-metal is removed.The microorganism that bioleaching is conventional is the acidophilic thiobacillus such as thiobacillus thiooxidans and thiobacillus ferrooxidant.The method is used to copper smelting the earliest, is applied to the removal of Heavy Metals in Sludge later by people.In bioleaching process, acid consumption is few, and the element loss such as nitrogen, phosphorus is little；Owing in leaching process, pH can drop to about 2, many pathogen and antibacterial all can be killed；Leaching simultaneously also can promote the dewatering of mud.Relative to other processing method, bioleaching has incomparable advantage, has huge potentiality in sludge heavy-metal process.
Patent CN101891358A discloses the method that heavy metals in excess sludge is removed in the coupling of a kind of bioleaching fenton-type reagent, and the method heavy metal removing rate is high, however it is necessary that the method coupling with other of the bioleaching technology, and cost is of a relatively high.CN102719657A discloses a kind of method that resource reclaims the heavy metal in electroplating sludge, and the method needs individually domestication, separates, cultivates strain, troublesome poeration.
Summary of the invention
It is an object of the invention to provide a kind of method that bioleaching removes Heavy Metals in Sludge Cd, simple to operate, cost is low, without additional strain, the clearance of metal Cd is high, and clearance is up to 81% ~ 85%, mud after process meets China's agricultural sludge standard, it is possible to recycling.
For achieving the above object, the present invention adopts the following technical scheme that
A kind of bioleaching removes the method for Heavy Metals in Sludge Cd, specifically includes following steps:
(1) before leaching, taking a part of mud and carry out being acidified to pH4 ~ 5, then every liter of mud adds 10 ~ 15gNa2S2O3, temperature 28-30 DEG C, dissolved oxygen 3 ~ 5mg/L when, be cultured to pH1.5 ~ 2.5；
(2) mud after step (1) being cultivated mixes in bioleaching pond as initial inoculation liquid and pending mud, adds Na in leaching pond2S2O3, for the volume of the mud as initial inoculation liquid, every liter of mud adds 10 ~ 15gNa2S2O3；Temperature 28-30 DEG C, dissolved oxygen 3 ~ 5mg/L when, bioleaching 8 to 10 days；
(3) retaining the leaching mud of 15%wt ~ 25%wt in bioleaching pond as inoculation liquid, all the other mud is discharged；
(4) add pending mud to leaching pond, mix with the mud as inoculation liquid retained, add Na2S2O3, for the volume retaining mud, every liter of mud adds 10 ~ 15gNa2S2O3；Temperature 28-30 DEG C, dissolved oxygen 3 ~ 5mg/L when, bioleaching 8 ~ 10 days；
(5) mud after process in step (4) being retained 15%wt ~ 25%wt, enter into next circulation as inoculation liquid, all the other mud is discharged；Repeat step (4)；
(6) the regular moisturizing of whole processing procedure, keeps sludge concentration.
Described a kind of bioleaching removes the method for Heavy Metals in Sludge Cd, and except first time processes, other cyclic process is all made without pre-acidified.
Described a kind of bioleaching removes the method for Heavy Metals in Sludge Cd, the amount (Na of the substrate that step (2) and (4) add2S2O3Amount) be for the volume as inoculation liquid mud.
Described a kind of bioleaching removes the method for Heavy Metals in Sludge Cd, and the mud after every time processing retains 15%wt ~ 25%wt, is recycled to the next process cycle, it is not necessary to additional strain.
Described a kind of bioleaching removes the method for Heavy Metals in Sludge Cd, wants continuous print aeration in processing procedure, and dissolved oxygen concentration maintains 3 ~ 5mg/L.
Described a kind of bioleaching removes the method for Heavy Metals in Sludge Cd, and regular moisturizing keeps sludge concentration 10 ~ 15g/L.
Described a kind of bioleaching removes the method for Heavy Metals in Sludge Cd, and in leaching process, mud is in acid state, many microorganisms and pathogen and can be killed.
The beneficial effects of the present invention is:A kind of bioleaching provided by the invention removes the method for Heavy Metals in Sludge Cd need not additional strain, easy and simple to handle, and the clearance of metal Cd is high, clearance is up to 81% ~ 85%, and the mud after process meets the agricultural standards of China's mud, simultaneously energy consumption and acid consumption is few, processing cost is low.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention will be further described, but the present invention is not limited only to these embodiments.
Embodiment 1
A kind of bioleaching removes the method for Heavy Metals in Sludge Cd, specifically includes following steps:
(1) before leaching, a part of mud carries out being acidified to pH5, and then every liter of mud adds 10gNa2S2O3, when temperature 28 DEG C, dissolved oxygen 3mg/L, it is cultured to pH2.5；
(2) mud after step (1) being cultivated mixes in bioleaching pond as initial inoculation liquid and pending mud, adds Na in leaching pond2S2O3, dosage is that every liter of mud adds 10gNa for the volume as initial inoculation liquid mud2S2O3；When temperature 28 DEG C, dissolved oxygen 3mg/L, bioleaching 8 days；
(3) retaining the leaching mud of 15%wt in bioleaching pond as inoculation liquid, all the other mud is discharged；
(4) put into pending mud, mix with the mud as inoculation liquid retained, add Na2S2O3, for the volume retaining mud, every liter of mud adds 10gNa2S2O3；When temperature 28 DEG C, dissolved oxygen 3mg/L, bioleaching 8 days；
(5) the regular moisturizing of whole processing procedure.
After tested, the clearance to mud metal Cd is 81%, and the mud after process meets China's agricultural sludge standard.
Embodiment 2
A kind of bioleaching removes the method for Heavy Metals in Sludge Cd, specifically includes following steps:
(1) before leaching, taking a part of mud and carry out being acidified to pH.5, then every liter of mud adds 12gNa2S2O3, when temperature 29 DEG C, dissolved oxygen 4mg/L, it is cultured to pH2；
(2) mud after step (1) being cultivated mixes in bioleaching pond as initial inoculation liquid and pending mud, adds Na in leaching pond2S2O3, dosage is that every liter of mud adds 12gNa for the volume as initial inoculation liquid mud2S2O3；When temperature 29 DEG C, dissolved oxygen 4mg/L, bioleaching 9 days；
(3) retaining the leaching mud of 20%wt in bioleaching pond as inoculation liquid, all the other mud is discharged；
(4) put into pending mud, mix with the mud as inoculation liquid retained, add Na2S2O3, dosage is that every liter of mud adds 12gNa for the volume retaining mud2S2O3；When temperature 29 DEG C, dissolved oxygen 4mg/L, bioleaching 9 days；
(5) the regular moisturizing of whole processing procedure.After tested, the clearance to mud metal Cd is 83.5%, and the mud after process meets China's agricultural sludge standard.
Embodiment 3
A kind of bioleaching removes the method for Heavy Metals in Sludge Cd, specifically includes following steps:
(1) before leaching, taking a part of mud and carry out being acidified to pH4, then every liter of mud adds 15gNa2S2O3, when temperature 30 DEG C, dissolved oxygen 5mg/L, it is cultured to pH1.5；
(2) mud after step (1) being cultivated mixes in bioleaching pond as initial inoculation liquid and pending mud, adds Na in leaching pond2S2O3, dosage is for the volume as initial inoculation liquid mud, and every liter of mud adds 15gNa2S2O3；When temperature 30 DEG C, dissolved oxygen 5mg/L, bioleaching 10 days；
(3) retaining the leaching mud of 25%wt in bioleaching pond as inoculation liquid, all the other mud is discharged；
(4) put into pending mud, mix with the mud as inoculation liquid retained, add Na2S2O3, dosage is that every liter of mud adds 15gNa for the volume retaining mud2S2O3；When temperature 30 DEG C, dissolved oxygen 5mg/L, bioleaching 10 days；
(5) the regular moisturizing of whole processing procedure.
After tested, the clearance to mud metal Cd is 85%, and the mud after process meets China's agricultural sludge standard.
The foregoing is only presently preferred embodiments of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to the covering scope of the present invention.
Claims (8)
1. the method that a bioleaching removes Heavy Metals in Sludge Cd, it is characterised in that: specifically include following steps:
(1) take a part of mud and carry out acidifying, then add Na2S2O3Cultivate；
(2) mud after step (1) being cultivated mixes as initial inoculation liquid with pending mud in bioleaching pond, adds Na2S2O3, carry out bioleaching；
(3) retaining the leaching mud of 15%wt ~ 25%wt in bioleaching pond as inoculation liquid, all the other mud is discharged；
(4) in leaching pond, add pending mud, mix with the mud retained, add Na2S2O3, carry out bioleaching；
(5) mud after process in step (4) being retained 15%wt ~ 25%wt and enter subsequent cycle, all the other mud is discharged；Repeat step (4)；
(6) the regular moisturizing of whole processing procedure, keeps sludge concentration.
2. the method that a kind of bioleaching according to claim 1 removes Heavy Metals in Sludge Cd, it is characterised in that: mud acidifying pH to 4 ~ 5 in step (1), then add Na2S2O3After be cultured to pH1.5 ~ 2.5.
3. the method that a kind of bioleaching according to claim 1 removes Heavy Metals in Sludge Cd, it is characterised in that: the condition of culture of step (1) is: maintaining temperature 28-30 DEG C, dissolved oxygen maintains 3 ~ 5mg/L.
4. the method that a kind of bioleaching according to claim 1 removes Heavy Metals in Sludge Cd, it is characterized in that: the condition of step (2) and step (4) bioleaching is: temperature maintains 28-30 DEG C, dissolved oxygen maintains 3 ~ 5mg/L, and the time of leaching is 8 to 10 days.
5. the method that a kind of bioleaching according to claim 1 removes Heavy Metals in Sludge Cd, it is characterised in that: Na in step (1)2S2O3Dosage be that every liter of mud adds 10 ~ 15gNa2S2O3。
6. the method that a kind of bioleaching according to claim 1 removes Heavy Metals in Sludge Cd, it is characterised in that: Na in step (2)2S2O3Dosage be that every liter of mud adds 10 ~ 15gNa for the volume as initial inoculation liquid mud2S2O3。
7. the method that a kind of bioleaching according to claim 1 removes Heavy Metals in Sludge Cd, it is characterised in that: Na in step (4)2S2O3Dosage be every liter retain mud add 10 ~ 15gNa2S2O3。
8. the method that a kind of bioleaching according to claim 1 removes Heavy Metals in Sludge Cd, it is characterised in that: regularly moisturizing keeps sludge concentration to be 10 ~ 15g/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610148879.3A CN105731749B (en) | 2016-03-16 | 2016-03-16 | A kind of method of bioleaching removal Heavy Metals in Sludge Cd |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610148879.3A CN105731749B (en) | 2016-03-16 | 2016-03-16 | A kind of method of bioleaching removal Heavy Metals in Sludge Cd |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105731749A true CN105731749A (en) | 2016-07-06 |
| CN105731749B CN105731749B (en) | 2018-10-30 |
Family
ID=56250624
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610148879.3A Active CN105731749B (en) | 2016-03-16 | 2016-03-16 | A kind of method of bioleaching removal Heavy Metals in Sludge Cd |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105731749B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107716519A (en) * | 2017-11-07 | 2018-02-23 | 河南科技大学 | A kind of incineration of refuse flyash is innoxious and heavy metal resources method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101475259A (en) * | 2008-10-31 | 2009-07-08 | 南开大学 | Method for removing heavy metal in excess activated sludge |
| CN102424509A (en) * | 2011-10-26 | 2012-04-25 | 沈阳建筑大学 | Novel bioleaching method for treating heavy metals in sludge |
| JP5170069B2 (en) * | 2009-11-26 | 2013-03-27 | 栗田工業株式会社 | Biological treatment method for organic wastewater |
| CN103086580A (en) * | 2012-11-21 | 2013-05-08 | 福建省亚热带植物研究所 | Method for quickly removing heavy metals in municipal sludge |
-
2016
- 2016-03-16 CN CN201610148879.3A patent/CN105731749B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101475259A (en) * | 2008-10-31 | 2009-07-08 | 南开大学 | Method for removing heavy metal in excess activated sludge |
| JP5170069B2 (en) * | 2009-11-26 | 2013-03-27 | 栗田工業株式会社 | Biological treatment method for organic wastewater |
| CN102424509A (en) * | 2011-10-26 | 2012-04-25 | 沈阳建筑大学 | Novel bioleaching method for treating heavy metals in sludge |
| CN103086580A (en) * | 2012-11-21 | 2013-05-08 | 福建省亚热带植物研究所 | Method for quickly removing heavy metals in municipal sludge |
Non-Patent Citations (1)
| Title |
|---|
| 周顺桂等: "生物淋滤技术在去除污泥中重金属的应用", 《生态学报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107716519A (en) * | 2017-11-07 | 2018-02-23 | 河南科技大学 | A kind of incineration of refuse flyash is innoxious and heavy metal resources method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105731749B (en) | 2018-10-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101182093B (en) | Microbe harmless treatment method for oil-gas field waste slurry | |
| CN102875210A (en) | Method for co-composting of blue-green algae and polluted bottom sediment | |
| WO2020108214A1 (en) | Method of remediating arsenic pollution in soil using active iron and manganese oxides induced by bacteria under aerobic/microaerobic conditions | |
| CN105776788B (en) | A kind of method that bioleaching removes heavy metal Cu in sludge from wastewater treatment plant | |
| CN112657465A (en) | Preparation method of magnetic biochar and method for treating tailing wastewater | |
| CN109734199A (en) | Immobilized microorganism structural body and preparation method thereof | |
| CN104338736A (en) | Perishable organic matter oxidizing agent, treatment system and method for preparing humic acid-contained fertilizers | |
| CN105731750B (en) | A kind of method of mixed-matrix bioleaching removal sludge heavy-metal | |
| CN101050030A (en) | Method for treating arsenic waste solution of hazardous waste by using composite functional bacteria | |
| CN101255227A (en) | Method for synthesizing polyhydroxyalkanoates by employing oil-containing sludge | |
| CN107253761B (en) | Anaerobic ammonia oxidation rapid enhanced starting method based on inactivated sludge | |
| CN106336094A (en) | Heavy metal stabilization and reduction treatment method of domestic sludge | |
| CN109399881A (en) | A kind of method for sludge treatment | |
| CN102424509A (en) | Novel bioleaching method for treating heavy metals in sludge | |
| CN113072272A (en) | Method for removing heavy metals and recycling phosphorus in municipal sludge | |
| CN112794577A (en) | Remove SO42-And Cr (VI) | |
| CN112979366A (en) | Method for producing greening matrix by quickly composting dredged sediment | |
| CN105110589B (en) | A kind of deep dehydration method of municipal sludge | |
| CN117225879A (en) | Medicament for rapidly degrading explosive containing in polluted soil and application method thereof | |
| CN108114978A (en) | A kind of method of the efficient rehabilitating soil of chemistry-microorganism | |
| CN204918477U (en) | Clean processing apparatus of mud | |
| CN105731749A (en) | Method of removing heavy metal Cd in sludge through bioleaching | |
| CN207671878U (en) | High ammonia-nitrogen wastewater deamination nitrogen system | |
| CN106746407B (en) | Process for improving dehydration performance of excess sludge | |
| CN104925943B (en) | A kind of sanitary sewage landfill leachate treatment agent and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |