CN101830615A - Method for removing heavy metal Zn from sludge by bioleaching - Google Patents
Method for removing heavy metal Zn from sludge by bioleaching Download PDFInfo
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- CN101830615A CN101830615A CN201010168407A CN201010168407A CN101830615A CN 101830615 A CN101830615 A CN 101830615A CN 201010168407 A CN201010168407 A CN 201010168407A CN 201010168407 A CN201010168407 A CN 201010168407A CN 101830615 A CN101830615 A CN 101830615A
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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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Abstract
The invention provides a method for removing a heavy metal Zn from sludge by bioleaching, relates to technology for processing municipal solid waste, and aims to solve the problem of restriction on recycling the sludge, which contains higher heavy metal Zn content, of municipal sewage plants in agriculture and forestry. The method comprises the following steps of: adding a proper amount of cultured and domesticated inoculating solution in a reaction system, wherein the ratio of the substrate concentration to the sludge quantity (dry weight) is controlled to be 0.8 to 1.2; the sludge concentration is 15-30 g/L; the dissolved oxygen concentration is 7.5-8.0 mg/L; the reflux ratio of the sludge is 20-30 percent; and the temperature is controlled to be 25-30 DEG C; and supplementing water which is evaporated in a reactor regularly. By using the method, the removal rate of the heavy metal Zn reaches 80-90 percent through the bioleaching period.
Description
Technical field
The present invention relates to the municipal solid wastes treatment technology, be specifically related to the technological method that a kind of high bioleaching method is removed heavy metal Zn in the mud.
Background technology
China is fully paid attention to pollution treatment reduction of discharging and waste water control problem in recent years, the city sewage treatment works project development is very fast, yet for a large amount of mud that produce thereupon, adopts landfill to handle at present mostly, both waste a large amount of soils, again environment had been caused serious secondary pollution.The treatment and disposal of mud and utilization have more and more become the big problem that solution is badly in need of in China.In fact, dispose the excess sludge of municipal sewage plant and utilization is a global technical barrier, is the important subject that environmental science receives much attention in recent years.
Not only output was big in recent years for sewage treatment plant residual mud, and composition is very complicated, integrated solid materials such as the zoogloea that it comprises solid particulates such as the silt particle of sneaking in sanitary sewage or the trade effluent, fiber, plant and animal residues and agglomerative floss thereof, formed by multiple microorganism and adsorbed organic matter, heavy metal (copper, arsenic, lead, zinc, aluminium, mercury etc.) element and salt, a spot of pathogenic micro-organism, parasitic ovum also can produce the poisonous and harmful foul smell.These compositions have directly hindered the recycling of mud, and therefore for realizing the recycling of mud, it is very necessary at first mud being carried out harmless treatment.
Because also contain the amino acid and the required various trace elements of plant-growth of abundant N, P, K, trace in the mud.At present both at home and abroad more at the treatment and disposal technology kind of mud, but what generally admit for numerous scholars is mud to be converted into agricultural fertilizer is used and the farmland.This in the long run mud tallies with the national condition, and constructs recycling economy, realizes the utilization of resources, helps the Sustainable development of city and agricultural, has vast potential for future development.
In the face of this sewage sludge harmlessness problem, bioleaching becomes one of important topic of research at present as the state-of-the-art technology of removing heavy metal in the mud.Bioleaching (bioleaching) technology: promptly utilize the catalysed oxidn of the acidophilia thiobacillus of special chemosynthetic autotroph to reduce the pH value of sludge system, make the heavy metal of form hard to tolerate enter liquid phase from the solid phase stripping, by sludge dewatering, and reach the purpose of removing heavy metal in the mud.The bioleaching technology is applied to the stripping and the recovery of metal in difficult lixiviate ore or the lean ore at first, and begins to be applied to the leaching of heavy metal in the mud with the later stage eighties 20th century.The advantage of bioleaching technology is that (1) thiobacterium is not the pathogenic bacteria of humans and animals.(2) can utilize spent acid that mud is carried out pre-acidifying, can with the combination of existing good sample sludge digestion, can make full use of existing operation facility, working cost is low.(3) thiobacterium viability adaptability is strong in the mud, and breeding is fast, can start the leaching heavy metal fast.(4) simple to operate, operational process need not special control, all can the leaching heavy metal in 10～37 ℃ of scopes.(5) bioleaching can remove effectively that heavy metal can play the effect of killing pathogenic bacteria again in the mud.Yet, bioleaching is scarcely out of swaddling-clothes to the removal research of heavy metal in the mud,, also be not well solved at present to problem such as the removal efficient of some heavy metal is lower for the research of the removal mechanism of bioleaching, influence factor and bioleaching, need do a large amount of research.
Summary of the invention
The object of the present invention is to provide a kind of bioleaching method to remove the technological method of heavy metal Zn in the mud,, make the clearance of heavy metal Zn reach 80%～90% through the bioleaching time.
The objective of the invention is to be achieved through the following technical solutions:
A kind of bioleaching method is removed the technological method of heavy metal Zn in the mud, and this method comprises the bioleaching treatment process is combined with existing SBR method, adopts the instantaneous method of advancing mud and instantaneous spoil disposal; Before bioleaching, separation and purification thiobacillus ferrooxidant from mud-this bioleaching bacterium, the inoculation liquid of making bioleaching on this basis is used to be added in the reactor.
Described a kind of bioleaching method is removed the technological method of heavy metal Zn in the mud, and the temperature in its reactor is controlled at 25～30 ℃, and initial pH value is controlled in 5.65～5.75 scopes.
Described a kind of bioleaching method is removed the technological method of heavy metal Zn in the mud, the substrate that it adds, i.e. and the required energy substance of bioleaching bacterial growth breeding is FeSO
47H
2O, and the ratio of its concentration and dry weight sludge concentration is controlled at 0.8～1.2.
Described a kind of bioleaching method is removed the technological method of heavy metal Zn in the mud, and it dilutes thickened sludge, and its concentration is controlled at 15g/L～30g/L.
Described a kind of bioleaching method is removed the technological method of heavy metal Zn in the mud, and it is controlled at 7.5～8.0mg/L with the dissolved oxygen DO in the reactor under the precondition of control aeration rate.
Described a kind of bioleaching method is removed the technological method of heavy metal Zn in the mud, and it is under the condition that does not add inoculation liquid, and for the benefit of heavy metal Ni leaches, and the return sludge ratio in the reactor is controlled at 20%～30%.
Described a kind of bioleaching method is removed the technological method of heavy metal Zn in the mud, and the leaching cycle that its bioleaching method is removed heavy metal in the mud is 8～10d.
Description of drawings
Accompanying drawing 1 is removed the reactor of heavy metal in the mud for the bioleaching method.
Embodiment
Below in conjunction with specific embodiment the present invention is further explained:
Among the figure: 1 system apparatus of oxygen supply; 2 gas meters; 3 main reactors; 4 temperature control systems.
The present invention at first is thiobacillus ferrooxidant in the separation and purification mud and preparation bioleaching inoculation liquid by the following method, bright mud mixes with the thiobacillus ferrooxidant liquid nutrient medium of 150～270mL, rise to more than 480～550mv until the redox potential (ORP) of cultivating liquid in 25～30 ℃ of cultivations, the 1mL nutrient solution is mixed with the 9mL liquid nutrient medium, so continue doubling dilution to 10
-9Different dilution liquid are cultivated (each extent of dilution is done several repetitions) on the solid plate substratum, treat that the adularescent bacterium colony occurs, white colony is made bacteria suspension dilute separation by above-mentioned doing, next the dilution dilution of difference bacterium liquid is continued cultivating under 25～30 ℃ of conditions on the solid plate substratum, this repeats, and obtains the thiobacillus ferrooxidant of separation and purification.The thiobacillus ferrooxidant that separation and purification is obtained add on the ferrous thiobacillus liquid nutrient medium of newly joining rich cultivate 2～5 times after, above-mentioned bacterium liquid is inoculated in the mud in proportion, and sneaks into the FeSO of 5～15g/L
47H
20, place 25～30 ℃ of cultivations.When being reduced to 2.5 these acclimation periods when following, the pH value finishes.And then will appeal the bacterium liquid 10～20mL that cultivates in proportion and be forwarded in 120～140mL fresh sludge, add the FeSO of 5～15g/L simultaneously
47H
20 continues to cultivate, and repeats once this operation, obtains the required inoculation liquid of bioleaching.Next add 3～6% inoculation liquid in reaction system, and the initial pH value of reaction system is controlled in 5.65～5.75 scopes, temperature is controlled in 25～30 ℃ of scopes, and to substrate (FeSO
47H
20) bioleaching important factor in order optimized parameter values such as the dissolved oxygen (DO) of the ratio of concentration and sludge quantity (dry weight), sludge concentration, reaction system and return sludge ratio are selected, and its optimized parameter value is respectively: 0.8～1.2,15g/L～30g/L, 7.5～8.0mg/L, 20%～30%.
Finally, by controlling these conditions,, make that the clearance of heavy metal Zn is higher in the mud through the bioleaching cycle of 8～9d.
Embodiment one:
Get thickened sludge (one of them reactor is as parallel test) in two reactors, and sludge concentration is controlled at 15g/L～30g/L, while adds 3～6% domestication inoculation liquid in two reactors, the useful volume of these two reactors is 3L, adopt air aeration, air speed maintains 0.10～0.25m
3/ h, initial pH value is controlled at 5.60～5.85, the ratio 0.8～1.2 of concentration of substrate and sludge quantity (dry weight), dissolved oxygen concentration 7.5～8.0mg/L mg/L, temperature is controlled at 25～30 ℃.The moisture that evaporation is consumed in the regular replenishment reactor.The interval sampling, sample is centrifugal 5～15min on whizzer, with supernatant liquor and precipitate and separate, the concentration of heavy metal in pH value in the mensuration supernatant liquor and the leachate.Through the bioleaching week after date of 8～10d, the clearance of heavy metal Zn satisfies mud agricultural reuse standard substantially up to 90%～95% in its mud.
Embodiment two:
Concrete grammar and embodiment one, different is does not throw 3%～6% domestication inoculation liquid in embodiment two processes, but with the returned sluge of the precipitating sludge behind the embodiment one leaching end cycle as embodiment two, its reflux ratio is 15%～32%.Behind the bioleaching end cycle through 8～10d, the clearance of heavy metal Zn reaches 80%～90% in its mud, satisfies mud agricultural reuse standard substantially.
Claims (7)
1. a bioleaching method is removed the technological method of heavy metal Zn in the mud, it is characterized in that this method comprises the bioleaching treatment process is combined with existing SBR method, adopts the instantaneous method of advancing mud and instantaneous spoil disposal; Before bioleaching, separation and purification thiobacillus ferrooxidant from mud-this bioleaching bacterium, the inoculation liquid of making bioleaching on this basis is used to be added in the reactor.
2. a kind of bioleaching method according to claim 1 is removed the technological method of heavy metal Zn in the mud, it is characterized in that the temperature in the reactor is controlled at 25～30 ℃, and initial pH value is controlled in 5.65～5.75 scopes.
3. a kind of bioleaching method according to claim 1 is removed the technological method of heavy metal Zn in the mud, it is characterized in that the substrate that adds, i.e. the required energy substance of bioleaching bacterial growth breeding is FeSO
47H
2O, and the ratio of its concentration and dry weight sludge concentration is controlled at 0.8～1.2.
4. a kind of bioleaching method according to claim 1 is removed the technological method of heavy metal Zn in the mud, it is characterized in that the thickened sludge dilution, and its concentration is controlled at 15g/L～30g/L.
5. a kind of bioleaching method according to claim 1 is removed the technological method of heavy metal Zn in the mud, it is characterized in that under the precondition of control aeration rate the dissolved oxygen DO in the reactor being controlled at 7.5～8.0mg/L.
6. a kind of bioleaching method according to claim 1 is removed the technological method of heavy metal Zn in the mud, it is characterized in that under the condition that does not add inoculation liquid, and for the benefit of heavy metal Ni leaches, and the return sludge ratio in the reactor is controlled at 20%～30%.
7. a kind of bioleaching method according to claim 1 is removed the technological method of heavy metal Zn in the mud, it is characterized in that it is 8～10d that the bioleaching method is removed the leaching cycle of heavy metal in the mud.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010168407A CN101830615A (en) | 2010-05-11 | 2010-05-11 | Method for removing heavy metal Zn from sludge by bioleaching |
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| CN201010168407A CN101830615A (en) | 2010-05-11 | 2010-05-11 | Method for removing heavy metal Zn from sludge by bioleaching |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102424509A (en) * | 2011-10-26 | 2012-04-25 | 沈阳建筑大学 | Novel method for processing heavy metal in sludge through bioleaching |
-
2010
- 2010-05-11 CN CN201010168407A patent/CN101830615A/en active Pending
Non-Patent Citations (2)
| Title |
|---|
| 《环境科学》 20030531 周顺桂等 污泥中氧化亚铁硫杆菌的分离及其应用效果 第57页左栏第2行至右栏第3行，右栏第7行至第31行，第60页左栏倒数第3行至右栏第2行 1-7 第24卷, 第3期 2 * |
| 《生态学报》 20020131 周顺桂等 生物淋滤技术在去除污泥中重金属的应用 第127页第4行至第128页倒数第4行 1-7 第22卷, 第1期 2 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102424509A (en) * | 2011-10-26 | 2012-04-25 | 沈阳建筑大学 | Novel method for processing heavy metal in sludge through bioleaching |
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Open date: 20100915 |