CN106905980A - A kind of heavy metal sewage sludge soil-repairing agent, preparation method and its application in sludge is dissolved - Google Patents
A kind of heavy metal sewage sludge soil-repairing agent, preparation method and its application in sludge is dissolved Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
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Abstract
The present invention provides a kind of heavy metal sewage sludge soil-repairing agent, preparation method and its application in sludge is dissolved, and the technical scheme for being used is：To the treatment of municipal sludge early stage, organic matter is decomposed with thermophilic bacteria, access heavy metal treatment microorganism.Through overtesting using after sludge renovation agent, the effective clearance of ratio of the various pollutants of soil reaches more than 95% and meets national standard.Simultaneously sulfuric acid matter can with in-situ immobilization heavy metal soil, or well organic fertilizer, be beneficial to agricultural production reduce chemical reagent use and chemical fertilizer use, prevented pollution sources and secondary pollution from source.
Description
Technical field
The present invention relates to a kind of heavy metal sewage sludge soil-repairing agent, preparation method and its application in sludge is dissolved, tool
Body be a kind of utilization microbiological treatment sludge prepare soil-repairing agent for heavy metal pollution method, obtain it is heavy metal-polluted
Mud soil-repairing agent, and its application in sludge is dissolved.
Background technology
At present, due to long-term use chemical fertilizer and various agricultural chemicals, the pollution along with water quality makes soil to the soil in agricultural land
Content of beary metal in earth is complicated, have impact on the agriculture performance and quality of soil.For a long time, a kind of original of rehabilitating soil is sought
Position passivating technique increasingly causes the attention of relevant department and expert, particularly seeks one kind and is combined using organic matter and inorganic matter
Body, realizes that soil in-situ is passivated repair function, is more beneficial for the raising and agricultural development of China's soil quality.
The bioconversion microbial action of microorganism heavy metal can change the activity of heavy metal ion, so as to influence
The biological effectiveness of heavy metal ion.Under field conditions (factors), many microorganisms can by redox, methylation and
Heavy metal ion is converted into nontoxic or low toxicity compound form by dealkylation etc.
The major way of microbial action conversion heavy metal ion has following 3 kinds：
(1) heavy metal is enriched with vivo and turn by the active of microorganism heavy metal and passive sedimentation
Change.
(2) by the metal transformation of microorganism, such as redox or alkyl metalepsis, and heavy metal is made
It is another form from a kind of Forms Transformation.(Thiobacillus ferrooxidans, oxidation are sub- for some microorganisms, such as acidophilus iron-oxidizing bacterium
Cleek end pylori etc.) being capable of Oxidation of Fe2+, reduction-state S (such as H2S etc.) and metal sulfide obtain the energy, influence permitted
Polymetallic activity.In addition to by oxidizing metal ions, microorganism can also some heavy metals be reduced into solubility or
Volatile form, can be hardly possible Hg if any biology slightly2+Volatile Hg is reduced into, the reduction of iron and manganese oxides also can be suction
It is attached to slightly solubility Fe3+、Mn4+Heavy metal release on oxide is out.
(3) microorganism can produce the material of influence heavy metal activity, the letter produced such as during bacteria metabolism
Single organic compound, macromolecular humic acid and fulvic acid or other secretion etc. can be complexed the heavy metal ion in environment, from
And realize the conversion between different heavy metal ion forms.Under the conditions of nutrition is sufficient, edaphon metabolism is active, promotes
Conversion to cadmium.
There is now many application examples using biotechnology repairing heavy metal pollution environment, but repairing effect is mostly paid no attention to
Think.Such as known hyperaccumulative plant ciliate desert-grass, it is used practically in many heavy metal pollution of soil areas.But plant
Thing reparation has certain limitation, and many plants can not all survive in the arid rugged environment as northwest China.
And the phytoremediation cycle is oversize, less efficient.In addition, also including the various bacterial remediation methods including sulphur reducing bacteria
Also it is applied among the reparation of Heavy-metal Polluted Environment.But because the thalline for having adsorbed heavy metal cannot be separated, according to
So it is present in environment, then due to a variety of causes, the heavy metal for having been absorbed by bacterium can be re-released into environment again.
In addition, the problems such as most of microorganism is to Redox Condition and the sensitiveness of toxic metals valence state change, has resulted in biology
Recovery technique application in practice still has certain difficulty.In addition, some saline soils high more increase it is biological prosthetic
Difficulty.Therefore, these deficiencies just make us in the urgent need to finding a kind of practical, economic, efficient soil in-situ recovery technique.
The content of the invention
For the difficulty for overcoming existing sludge to dissolve, the sludge heavy-metal soil-repairing agent that the present invention is provided is not only solved
Sludge treatment problem, and turn waste into wealth, sludge is become soil-repairing agent, the soil of energy repairing heavy metal pollution.
In order to achieve the above object, present invention employs following technical scheme：
1st, sludge pretreatment
The domestic sludge that city domestic sewage treatment plant produces can be properly added in airing field stacking, drying 10~15 days
Biological deodorant.Preliminary to reduce stink, machine is dehydrated and water content is reduced to less than 40% from 75% or so.
To addition auxiliary material, heavy metal deactivator in the sludge after above-mentioned dried process, after above-mentioned each component is well mixed
With pulverizer or crusher in crushing, screen cloth is crossed, be made the sludge granule of particle diameter only 10mm, it is standby.
The auxiliary material act as：The water content of conditioning of mud, gas permeability, cation exchange capacity (CEC) can increase sludge
Content of humic acid.In order to improve fermentation efficiency, the auxiliary material can be auxiliary material: sludge=1 with the quality parts ratio of the sludge:
20~100；
The auxiliary material can be crush after stalk, wheat straw, pomace, bean dregs, rice chaff, shale, turf, sawdust, coconut palm chaff or
One kind or any combination in manioc waste.Wherein, stalk, wheat straw, pomace, bean dregs, rice chaff can provide carbon source and nitrogen source；Saw
End, manioc waste or coconut palm chaff can be with the cation exchange capacity (CEC) of conditioning of mud with the water content of conditioning of mud and gas permeability, shale, grass
Charcoal increases the content of humic acid of sludge and the cation exchange capacity (CEC) of conditioning of mud.Can for example be selected from：Quality parts ratio is stalk：
Shale: turf: sawdust=(1-1.5): (1-1.5): 1: (1-1.5)；Bean dregs：Shale: turf: coconut palm chaff=1：(1-1.5)∶1∶
(1-1.5)；Fruit juice factory pomace leftover bits and pieces：Shale: turf: manioc waste=(1-1.5): (1-1.5): 1: (1-1.5) etc..
Described heavy metal deactivator is the one of coal ash or ground phosphate rock or zeolite or turf or quick lime or perlite
Plant or mixture, the heavy metal deactivator is heavy metal deactivator: sludge=1 with the quality parts ratio of the sludge: 100~
500。
Above-described heavy metal deactivator, may contain heavy metal (Cu, Zn, Pb, Cr etc.) in sludge, may be exceeded,
Heavy metal deactivator is added, by chemistry, physical-chemical reaction, heavy metal is stable in the presence of in passivator, do not influence farming
Thing.Such as coal ash, ground phosphate rock, zeolite and turf, quick lime, perlite etc..
2nd, the preparation of complex micro organism fungicide
The complex micro organism fungicide is included：Bacillus stearothermophilus microbial inoculum, thermophilus bacteria agent, liquid humid acid fertilizer
Bar bacterium, iron reduction spring bacillus, at least 3 kinds or various of comamonas,
The complex micro organism fungicide is included：Bacillus stearothermophilus microbial inoculum, thermophilus bacteria agent, liquid humid acid fertilizer
Bar bacterium, iron reduction spring bacillus, comamonas, the mixed proportion between each microbial inoculum is 1~10：1~10：1~10：1~10：
1~10.
First by bacillus stearothermophilus microbial inoculum, thermophilus bacteria agent, Corynebacterium humireducens, iron reduction spring bar
This five kinds of microorganism fungus kinds are respectively connected in the 100ml shaking flasks equipped with 15ml seed culture mediums for bacterium, comamonas, in shaking table
Upper water-bath concussion and cultivate carries out seed culture, obtains seed liquor；
Then access fermentor liquid with the 5 volume % of volume % to 10 ratios to be cultivated, so as to respectively obtain described five
The respective bacteria suspension of microorganism fungus kind is planted, 5 kinds of bacteria suspensions of above-mentioned acquisition is well mixed, so as to obtain the complex microorganism
Microbial inoculum.
The Spawn incubation method of seed liquor and zymotic fluid is as follows：LB culture mediums, pH7.0,30 DEG C of 48~72h of aerobic culture；
LB culture mediums are constituted：Peptone 10g/L, yeast extract 5g/L, sodium chloride 10g/L.
Above-mentioned each bacterium can select commercialized strain, and need not especially indicate.
Wherein it is possible to select following bacterial strain：Bacillus stearothermophilus (Bacillus stearothermophilus)
(CGMCC No.5846), streptococcus thermophilus (deposit number CICC20376) (Streptococcus thermophilus), corruption
Grow matter and reduce bar bacterium (CGMCC2452), comamonas (CCTCCAB2011133) and iron reduction spring bacillus
(CCTCCM2011498) etc..
3rd, the fermentation of complex micro organism fungicide
To the complex micro organism fungicide that acquisition in step 2 is accessed in pretreated sludge raw material, in 30-60 DEG C, pH5-8
Under conditions of fermented.
The inoculum concentration of described complex micro organism fungicide is 2-20ml/kg sludge；
Preferably, while accessing nutrient salt solution, the access amount of nutrient salt solution is 5-50g/1000kg sludge, the battalion
Supporting every liter of salting liquid includes (NH4)2SO4, 1~15g；KH2PO4, 1-5g；K2HPO4·3H2O, 1-5g；CaCl2, 0.01~0.1g；
FeSO4, 0.1~1mg；Dusty yeast, 1~15g；MgCl2·6H2O, 1-1.5g；Cysteine, 0.1~5g；
Above-mentioned various material mixings are stirred；Then the sludge that will be prepared transports to fermentation plant, carries out compost fermentation；
Preferably, compost fermentation method is：By above-mentioned compound stacking, cover film moisturizing, ferment 3~7 days, determine temperature
Degree, when temperature reaches 60~65 DEG C, can stir once under 60 DEG C or so hot conditions by 24-36 hours, then again etc.
During to temperature up to 60 DEG C, stir for the second time, stir place 5-7 days naturally afterwards for the second time, fermentation temperature is stablized below 40 DEG C just
Complete fermentation.Sludge becomes thoroughly decomposed substantially, and stink disappears, and temperature drops to less than 40 DEG C, and moisture drops to less than 35%, prepares
First tunning.
4th, heavy metal treatment microorganism secondary fermentation
By the above-mentioned tunning of 80~100 weight portions, 60~90 weight portions by pretreating sludge, 5~20 weight
The humic acid, the chitin of 10-25 weight portions, the phosphoric acid,diluted of 10-15 weight portions, the ethylenediamine tetrem of 0.1~1 weight portion of part
Acid, the heavy metal treatment microorganism species of 1~10 weight portion stir, and carry out secondary fermentation.
Preferably, by the above-mentioned tunning of 90 weight portions, the sludge of 75 weight portions, 10 parts of humic acid, 15 weight portions
Chitin, the phosphoric acid,diluted of 10 weight portions, the ethylenediamine tetra-acetic acid of 0.5 weight portion, the heavy metal treatment microorganism species of 5 weight portions
Stir after fermentation.
Wherein, added in the chitin that will be weighed in phosphoric acid,diluted, be sufficiently stirred for, treat that chitin is formed in being dissolved in phosphoric acid,diluted
Solution, mixes with other compositions again afterwards；
Wherein, the heavy metal treatment microorganism species contain Bacillus cereus (Bacilluscereus), citric acid
Bacillus (Citrobacter), bacillus subtilis (Bacillus), Rhizopus a rrhiz (Rhizopusarrhizus), dynamic glue bacterium
Category (Aoogloea), pseudomonas aeruginosa (Pseudomonasaeruginosa), brewer's yeast
(Saccharomycescerevisiae), above-mentioned commercialization bacterium is according to 1~2：1~2：1~2：1~2：1~2：1~2：1~2
Composition.
Above-mentioned Bacillus cereus (Bacilluscereus), citric acid bacillus (Citrobacter), bacillus subtilis
(Bacillus), Rhizopus a rrhiz (Rhizopusarrhizus), Zoogloea (Aoogloea), pseudomonas aeruginosa
(Pseudomonasaeruginosa), brewer's yeast (Saccharomycescerevisiae) can be commercialized sludge
The conventional strain for the treatment of, and do not need special selection and processing.
Preferably, the secondary fermentation is：Temperature controlled fermentation, rises to 62-72 DEG C of condition and issues in room temperature >=38 DEG C, material temperature
Ferment, makes material realize the mineralization reaction of high temperature, and rotten degree >=80% was stirred 3 hours every 24-72 hours, and sealing and standing continues
Fermentation, so circulation 2-5 times is until fermentation ends.
5th, above-mentioned heavy metal soil-repairing agent is crushed, metering, packs and be put in storage.
Present invention simultaneously provides a heavy metal species soil in-situ restorative procedure, methods described is：By above-mentioned heavy metal soil
Renovation agent is applied to heavy metal pollution soil, and the amount of application of every mu of ground heavy metal soil-repairing agent is 100-1000kg；
Preferably, methods described also includes applying the weight of fertilizer and plant ash, the fertilizer and heavy metal soil-repairing agent
Amount is than being 1：10~100, the plant ash is 1 with the weight ratio of heavy metal soil-repairing agent：5~20, the composition of the fertilizer
For：Organic animal excreta 20-40 parts, humic acid 3-10 parts, water-loss reducer 0.4-2 parts, butanedioic acid 2-3 parts, wherein water-loss reducer is agricultural
Common product in production, for example：Acrylamide and acrylic acid salt crosslinking copolymerization thing (polyacrylamide, Sodium Polyacrylate, poly- third
Olefin(e) acid potassium, ammonium polyacrylate etc.)；Starch grafted acrylate crosslinking copolymerization thing (starch grafted acrylate).
Preferably, the particle diameter of plant ash is less than or equal to 5mm.
Preferably, it is the 50~70% of field saturation moisture capacity that soil moisture is maintained in repair process.
Preferably, repairing efficiency is 60~120 days.
The beneficial effect of the soil-repairing agent that the present invention is prepared is：
The overall production process of sludge fermentation desiccation, does not produce waste liquid, waste residue, and smell index meets country two after deodorant
Level standard air.After all raw materials are through treatment, except discharge vapor and a small amount of CO2In addition, Nutrition Soil or fertilizer are all become.
The present invention makes up straw nutrition not using the nutrients such as organic matter higher, nitrogen, phosphorus are contained in activated sludge
Foot so that the silicon element in agricultural byproduct is combined with organic fertilizer with nitrogen, phosphorus, potassium three elements optimization cooperation, inorganic fertilizer, quick-acting
It is fertile with it is long-acting be combined, straw bio-fermentation agent is combined with nitrogen-fixing bacteria, phosphate solubilizing bacteria and potassium solubilizing bacteria, effect is complementary, finally not only
Crops good year production is realized, the effect of increasing both production and income also causes that this straw biological organic silicon potassium ferment fertilizer turns into
Excellent " soil conditioner ", " slow-release soil moisture agent " and " heavy metal absorbent ", can adjust soil fertility, suppress root system of plant and inhale
Heavy metal is received, water and soil pollution source is reduced, it is to avoid heavy metal eliminates potential prestige of the heavy metal to human health to farmland secondary pollution
The side of body, goes back field with realizing silicon potassium safety non-pollution, solves the safety issue on heavy metal and harmful bacteria in agricultural sludge.
Through after the hot fermentation for continuing more than 50 DEG C, fermentation is thorough, free from extraneous odour for the organic wastes such as sludge, and sterilization is gone out ovum,
Killing grass-seed, the Nutrition Soil that sludge is generated through biofermentation, not only the content of organic matter is high, also have substantial amounts of beneficial bacterium and part raw
Reason active material.Applied in soil, by increasing capacitance it is possible to increase soil organic matter content, improve soil activation, improve soil physical chemistry, delayed
Solution soil hardening；Crop growth can also be promoted, promote early ripening of the crops, make crop root flourishing, stem is thick, leaf is thick.Improve
Crop drought resistance, waterlogging-resistant, cold-resistant, resistant to lodging, diseases and insect pests resistance, volume increase, the effect of increasing income are obvious.
Specific embodiment
With reference to specific embodiment to sludge soil-repairing agent of the invention, preparation method and its in sludge is dissolved
Using being described in detail.The measuring method of all technical of the sludge used in this experiment is according to Chinese people's republicanism
State's agricultural industry criteria (NY884-2004) is carried out.
The preparation of the heavy metal soil-repairing agent of embodiment 1
1st, sludge pretreatment
The domestic sludge that city domestic sewage treatment plant produces can be properly added in airing field stacking, drying 10~15 days
Biological deodorant.Preliminary to reduce stink, machine is dehydrated and water content is reduced to less than 40% from 75% or so.
To addition auxiliary material, heavy metal deactivator in the sludge after above-mentioned dried process, after above-mentioned each component is well mixed
With pulverizer or crusher in crushing, screen cloth is crossed, be made the sludge granule of particle diameter only 10mm, it is standby.
The auxiliary material is stalk：Bean dregs：Shale: turf: sawdust=1：1: 1: 1: 1, the matter of the auxiliary material and the sludge
Amount portion rate is auxiliary material: sludge=1: 20；
Described heavy metal deactivator be coal ash, quick lime, the mixture of perlite, the heavy metal deactivator with it is described
The quality parts ratio of sludge is heavy metal deactivator: sludge=1: 100.
2nd, the preparation of complex micro organism fungicide
The complex micro organism fungicide is included：Bacillus stearothermophilus microbial inoculum, thermophilus bacteria agent, liquid humid acid fertilizer
Bar bacterium, iron reduction spring bacillus, comamonas, the mixed proportion between each microbial inoculum is 2：2：5：5：5.
First by bacillus stearothermophilus microbial inoculum, thermophilus bacteria agent, Corynebacterium humireducens, iron reduction spring bar
This five kinds of microorganism fungus kinds are respectively connected in the 100ml shaking flasks equipped with 15ml seed culture mediums for bacterium, comamonas, in shaking table
Upper water-bath concussion and cultivate carries out seed culture, obtains seed liquor；
Then access fermentor liquid with the 5 volume % of volume % to 10 ratios to be cultivated, so as to respectively obtain described five
The respective bacteria suspension of microorganism fungus kind is planted, 5 kinds of bacteria suspensions of above-mentioned acquisition is well mixed, so as to obtain the complex microorganism
Microbial inoculum.
The Spawn incubation method of seed liquor and zymotic fluid is as follows：LB culture mediums, pH7.0,30 DEG C of 48~72h of aerobic culture；
LB culture mediums are constituted：Peptone 10g/L, yeast extract 5g/L, sodium chloride 10g/L.
3rd, the fermentation of complex micro organism fungicide
To the complex micro organism fungicide that acquisition in step 2 is accessed in pretreated sludge raw material, in 30-60 DEG C, pH5-8
Under conditions of fermented.
The inoculum concentration of described complex micro organism fungicide is 10ml/kg sludge；
Preferably, while accessing nutrient salt solution, the access amount of nutrient salt solution is 10g/1000kg sludge, the nutrition
Every liter of salting liquid includes (NH4)2SO4, 10g；KH2PO4, 3g；K2HPO4·3H2O, 3g；CaCl2, 0.05g；FeSO4, 0.5mg；Ferment
Female powder, 10g；MgCl2·6H2O, 1g；Cysteine, 0.5g；
Above-mentioned various material mixings are stirred；Then the sludge that will be prepared transports to fermentation plant, carries out compost fermentation；
Preferably, compost fermentation method is：By above-mentioned compound stacking, cover film moisturizing, ferment 3~7 days, determine temperature
Degree, when temperature reaches 60~65 DEG C, can stir once under 60 DEG C or so hot conditions by 24-36 hours, then again etc.
During to temperature up to 60 DEG C, stir for the second time, stir place 5-7 days naturally afterwards for the second time, fermentation temperature is stablized below 40 DEG C just
Complete fermentation.Sludge becomes thoroughly decomposed substantially, and stink disappears, and temperature drops to less than 40 DEG C, and moisture drops to less than 35%, prepares
First tunning.
4th, heavy metal treatment microorganism secondary fermentation
By the above-mentioned tunning of 80 weight portions, 60 weight portions by pretreating sludge, the humic acid of 5 weight portions, 10
The chitin of weight portion, the phosphoric acid,diluted of 10 weight portions, the ethylenediamine tetra-acetic acid of 0.1 weight portion, the heavy metal of 1 weight portion process micro-
Biological stirring is uniform, carries out secondary fermentation.
Wherein, added in the chitin that will be weighed in phosphoric acid,diluted, be sufficiently stirred for, treat that chitin is formed in being dissolved in phosphoric acid,diluted
Solution, mixes with other compositions again afterwards；
Wherein, the heavy metal processes microorganism by Bacillus cereus (Bacilluscereus), citric acid bacillus
(Citrobacter), bacillus subtilis (Bacillus), Rhizopus a rrhiz (Rhizopusarrhizus), Zoogloea
(Aoogloea), pseudomonas aeruginosa (Pseudomonasaeruginosa), brewer's yeast
(Saccharomycescerevisiae), the ratio between CFU of above-mentioned bacterium is 1: 1: 1: 1: 1: 1: 1.
The secondary fermentation is：Temperature controlled fermentation, ferments under the conditions of room temperature >=38 DEG C, material temperature rise to 62-72 DEG C, makes material
The mineralization reaction of high temperature is realized, rotten degree >=80% was stirred 3 hours every 24-72 hours, and sealing and standing continues to ferment, so
Circulation 2-5 times is until fermentation ends.
5th, above-mentioned heavy metal soil-repairing agent is crushed, metering, packs and be put in storage.
The soil remediation of embodiment 2, only adds heavy metal soil-repairing agent in contaminated soil
The heavy metal soil-repairing agent that embodiment 1 is prepared is applied to heavy metal pollution soil, every mu of ground heavy metal
The amount of application of soil-repairing agent is 500kg；
Heavy metal soil-repairing agent is crossed into 5mm mesh screens, it is uniformly sprinkled into after uniformly mixing using turning machine to be repaired
In the soil of heavy metal pollution, it is mixed with the soil of soil surface 40cm using rotary cultivator, the regulation soil that waters afterwards is wet
It is the 60% of field saturation moisture capacity to spend, and after the 60d that banks up naturally at room temperature, determines bioavailable state, medium profit in soil
With state and difficult Zn, Pb and Cd using form concentration value.
Result shows：Soil pH value rises to 6.1；The concentration of Zn, Pb and Cd of bioavailable state is respectively 263.1,
145.8 and 1.9mg/kg, have dropped 39.2,40.2 and 86.1% respectively；The concentration of Zn, Pb and Cd of medium utilization state is respectively
582.4th, 326.5 and 4.8mg/kg, the concentration of Zn, Pb and Cd have dropped 12.1,9.4 and 11.2% respectively；The Zn of hardly possible utilization state,
The concentration of Pb and Cd is respectively 754.1,525.4 and 11.9mg/kg, and 52.0,86.2 and 76.4% is risen respectively.
The soil remediation of embodiment 3, adds heavy metal soil-repairing agent+fertilizer in contaminated soil
The heavy metal soil-repairing agent that embodiment 1 is prepared is applied to heavy metal pollution soil, every mu of ground heavy metal
The amount of application of soil-repairing agent is 500kg；
Heavy metal soil-repairing agent is crossed into 5mm mesh screens, is well mixed with fertilizer, the fertilizer and heavy metal soil-repairing agent
Weight ratio be 1：10, the composition of the fertilizer is：20 parts of organic animal excreta, 5 parts of humic acid, 0.4 part of water-loss reducer, butanedioic acid 2
Part, wherein water-loss reducer is polyacrylamide.
Uniformly it is sprinkled into the soil of heavy metal pollution to be repaired after making its uniform mixing using turning machine, using rotary cultivator
It is mixed with the soil of soil surface 40cm, regulation soil moisture of watering afterwards is the 60% of field saturation moisture capacity, room temperature
After the lower 60d that banks up naturally, bioavailable state, medium utilization state and difficult Zn, Pb and Cd using form in soil is determined
Concentration value.
Result shows：Soil pH value rises to 6.7；The concentration of Zn, Pb and Cd of bioavailable state is respectively 201.2,
109.7 and 1.2mg/kg, have dropped 42.1,45.2 and 89.1% respectively；The concentration of Zn, Pb and Cd of medium utilization state is respectively
422.3rd, 263.1 and 3.5mg/kg, the concentration of Zn, Pb and Cd have dropped 19.1,11.4 and 15.0% respectively；Hardly possible is using state
The concentration of Zn, Pb and Cd is respectively 814.2,591.2 and 16.9mg/kg, and 68.1,89.2 and 83.6% is risen respectively.
The soil remediation of embodiment 4, adds heavy metal soil-repairing agent+fertilizer+plant ash in contaminated soil
The heavy metal soil-repairing agent that embodiment 1 is prepared is applied to heavy metal pollution soil, every mu of ground heavy metal
The amount of application of soil-repairing agent is 500kg；
Heavy metal soil-repairing agent is crossed into 5mm mesh screens, is well mixed with fertilizer, plant ash, the fertilizer and huge sum of money dependent territory
The weight ratio of earth renovation agent is 1：Plant ash described in 10 is 1 with the weight ratio of heavy metal soil-repairing agent：10, the group of the fertilizer
Turn into：20 parts of organic animal excreta, 5 parts of humic acid, 0.4 part of water-loss reducer, 2 parts of butanedioic acid, wherein water-loss reducer are polyacrylamide.
Uniformly it is sprinkled into the soil of heavy metal pollution to be repaired after making its uniform mixing using turning machine, using rotary cultivator
It is mixed with the soil of soil surface 40cm, regulation soil moisture of watering afterwards is the 60% of field saturation moisture capacity, room temperature
After the lower 60d that banks up naturally, bioavailable state, medium utilization state and difficult Zn, Pb and Cd using form in soil is determined
Concentration value.
Result shows：Soil pH value rises to 6.9；The concentration of Zn, Pb and Cd of bioavailable state is respectively 151.2,
89.1 and 0.7mg/kg, have dropped 52.8,64.1 and 93.5% respectively；The concentration of Zn, Pb and Cd of medium utilization state is respectively
231.6th, 153.4 and 2.3mg/kg, the concentration of Zn, Pb and Cd have dropped 31.2,25.3 and 23.1% respectively；Hardly possible is using state
The concentration of Zn, Pb and Cd is respectively 1010.3,721.0 and 25.3mg/kg, and 75.1,92.5 and 93.6% is risen respectively.
Meanwhile, the heavy metal adsorption amount of the various microorganisms in heavy metal soil-repairing agent is calculated, specific as follows
Shown in table：
Heavy metal element microorganism uptake (dry ratio %) of table 1
Soil Planting Crops after the reparation of embodiment 5
After verifying that the repairing effect of the implementation heavy metal, the soil remediation process of 60d terminate, do not repairing respectively
Repairing effect is tested in earth backing earth and rehabilitating soil.In May, 2015, to August, heavy metal pollution is received near Fangshan, Beijing
Farmland, using the method for random district's groups, 6 district's groups are provided with altogether, 48 subquadrats of 2m × 2m, the gross area about 300 is flat
Rice or so.In each district's groups by the way of drawing lots, 24 subquadrats for smoking soil, 24 sample prescription applications are determined at random
The technology of the present invention treatment, is compareed with other 24 subquadrats for not smoking soil, and then having planted three kinds can plant throughout the year
The vegetables of plant, be respectively, four seasons pakchoi, short-foot Chinese cabbage and cabbage heart.
During three kinds of vegetable growths, periodically NPK composite fertilizers are applied twice, and spray insecticide twice, because season is former
Cause, faster, rear harvesting in about 40 days or so, scene weighs and calculates the biomass fresh weight of its aerial part vegetable growth, and adopts
Collection sample takes back laboratory, and drying weighs its dry weight.Activities of Some Plants sample is taken back after clean up silt behind laboratory, is spent
Ionized water is rinsed 3 times, drying, is crushed, and through microwave nitric acid digestion, lead (Pb), zinc (Zn) in digestive juice, copper (Cu) uses ICP-
OES is determined, and cadmium (Cd) uses atomic absorption detecting.Test result indicate that, the technology of the present invention not only has good fixed heavy metal
Effect (referring to table 2), while also improve vegetables biomass, the vegetables Aboveground Biomass of Young that the sample ground smoked after soil is harvested is done
Anharmonic ratio increased 49.58%-75.12% with not smoking the sample of soil, there occurs pole significant change.
Table 2 uses the testing result of the method rehabilitating soil of embodiment
From table 2, using the inventive method rehabilitating soil, harmful organism content is low, and living bacteria count amount is high, organic
Matter content is high, and heavy metal chromium, mercury, arsenic, the content of lead are all greatly lowered；Colibacillus of excrement group number, induced worm egg death rate have
Obvious improvement, living bacteria count, the content of organic matter are all substantially improved, and can realize good basis for agricultural production.
Experimental result is also demonstrated that simultaneously, with three kinds of vegetables aerial part weights of the soil results after the technology of the present invention treatment
Compared with the vegetables that tenor (being based on fresh weight) is harvested with untreated soil, lead (Pb) at most reduces by 65.12%, zinc (Zn)
56.97% is at most reduced, copper (Cu) at most reduces by 45.21%, and cadmium (Cd) at most reduces 86.20%.A particularly poisonous huge sum of money
Category cadmium (Cd), the vegetables aerial part content of beary metal (being based on fresh weight) that the soil after being processed using the inventive technique is harvested is less than
The food contaminant limit standard of Codex Alimentary Commission (CAC) regulation, has reached level safe to eat.
The invention is not limited in foregoing specific embodiment.The present invention is expanded to and any in this manual disclosed
New feature or any new combination, and disclose any new method or process the step of or any new combination.
Claims (9)
1. a kind of preparation method of heavy metal sewage sludge soil-repairing agent, it is characterised in that described preparation method includes following step
Suddenly：1) sludge pretreatment of raw material；2) preparation of complex micro organism fungicide；3) fermentation of complex micro organism fungicide；4) at heavy metal
Reason microorganism secondary fermentation；5) above-mentioned heavy metal soil-repairing agent is crushed, metering, packs and be put in storage.
2. a kind of preparation method of heavy metal sewage sludge soil-repairing agent as claimed in claim 1, it is characterised in that described dirt
Mud pretreatment of raw material is：The domestic sludge that city domestic sewage treatment plant produces can be fitted in airing field stacking, drying 10~15 days
When addition biological deodorant.Preliminary to reduce stink, machine is dehydrated and water content is reduced to less than 40% from 75% or so；Upwards
Addition auxiliary material, heavy metal deactivator in the sludge after dried process are stated, with pulverizer or broken after above-mentioned each component is well mixed
Broken crusher machine, crosses screen cloth, is made the sludge granule of particle diameter only 10mm, standby；The mass fraction of the auxiliary material and the sludge
Than that can be auxiliary material: sludge=1: 20~100；The heavy metal deactivator and the quality parts ratio of the sludge are attached most importance to metallic blunt
Agent: sludge=1: 100~500.
3. a kind of preparation method of heavy metal sewage sludge soil-repairing agent as claimed in claim 1, it is characterised in that composite microbial
The preparation of thing microbial inoculum：The complex micro organism fungicide is included：Bacillus stearothermophilus microbial inoculum, thermophilus bacteria agent, humic
Matter reduction bar bacterium, iron reduction spring bacillus, at least 3 kinds or various of comamonas, microorganism fungus kind is respectively connected to dress
Have in the 100ml shaking flasks of 15ml seed culture mediums, water-bath concussion and cultivate carries out seed culture on shaking table, obtains seed liquor；So
Access fermentor liquid with the 5 volume % of volume % to 10 ratios afterwards to be cultivated, so as to respectively obtain the respective bacterium of the strain
Suspension, the bacteria suspension of above-mentioned acquisition is well mixed, so as to obtain the complex micro organism fungicide.The bacterium of seed liquor and zymotic fluid
Plant cultural method as follows：LB culture mediums, pH7.0,30 DEG C of 48~72h of aerobic culture；LB culture mediums are constituted：Peptone 10g/L,
Yeast extract 5g/L, sodium chloride 10g/L.
4. a kind of preparation method of heavy metal sewage sludge soil-repairing agent as claimed in claim 1, it is characterised in that composite microbial
The fermentation of thing microbial inoculum is：To complex micro organism fungicide is accessed in pretreated sludge raw material, in 30-60 DEG C, the condition of pH5-8
Under fermented.The inoculum concentration of described complex micro organism fungicide is 2-20ml/kg sludge；Nutrient salt solution, battalion are accessed simultaneously
The access amount for supporting salting liquid is 5-50g/1000kg sludge, and every liter of the nutrient salt solution includes (NH4)2SO4, 1~15g；
KH2PO4, 1-5g；K2HPO4·3H2O, 1-5g；CaCl2, 0.01~0.1g；FeSO4, 0.1~1mg；Dusty yeast, 1~15g；
MgCl2·6H2O, 1-1.5g；Cysteine, 0.1~5g.
5. a kind of preparation method of heavy metal sewage sludge soil-repairing agent as claimed in claim 1, it is characterised in that described weight
Metal processes microorganism secondary fermentation：The process of the above-mentioned tunning of 80~100 weight portions, 60~90 weight portions is located in advance
Reason sludge, the humic acid of 5~20 weight portions, the chitin of 10-25 weight portions, the phosphoric acid,diluted of 10-15 weight portions, 0.1~1 weight
The ethylenediamine tetra-acetic acid of part, the heavy metal treatment microorganism of 1~10 weight portion stir, and carry out secondary fermentation, the huge sum of money
Category treatment microorganism is by Bacillus cereus (Bacilluscereus), citric acid bacillus (Citrobacter), bacillus subtilis
Bacterium (Bacillus), Rhizopus a rrhiz (Rhizopusarrhizus), Zoogloea (Aoogloea), pseudomonas aeruginosa
(Pseudomonasaeruginosa), brewer's yeast (Saccharomycescerevisiae) is according to 1~2：1~2：1~2：1
~2：1~2：1~2：1~2 composition；The secondary fermentation is：Temperature controlled fermentation, 62-72 DEG C of bar is risen in room temperature >=38 DEG C, material temperature
Fermented under part, material is realized the mineralization reaction of high temperature, rotten degree >=80% was stirred 3 hours every 24-72 hours, sealed quiet
Put continuation to ferment, so circulation 2-5 times is until fermentation ends.
6. a kind of heavy metal sewage sludge soil-repairing agent, it is characterised in that described sludge soil-repairing agent is by claim 1-
Any one of 5 prepare.
7. a kind of application of heavy metal sewage sludge soil-repairing agent, the application refers to by described heavy metal sewage sludge soil-repairing agent
It is applied to the in-situ immobilization of heavy-metal contaminated soil.
8. as claimed in claim 7 to apply, the in-situ immobilization is：Heavy metal soil-repairing agent is applied to heavy metal pollution
Soil, the amount of application of every mu of ground heavy metal soil-repairing agent is 100-1000kg；
Preferably, methods described also includes applying the weight ratio of fertilizer and plant ash, the fertilizer and heavy metal soil-repairing agent
It is 1：10~100, the plant ash is 1 with the weight ratio of heavy metal soil-repairing agent：5~20, the composition of the fertilizer is：Have
20-40 parts of machine animal excreta, humic acid 3-10 parts, water-loss reducer 0.4-2 parts, butanedioic acid 2-3 parts, wherein water-loss reducer be agricultural production in
Common product, for example：Acrylamide and acrylic acid salt crosslinking copolymerization thing (polyacrylamide, Sodium Polyacrylate, polyacrylic acid potassium,
Ammonium polyacrylate etc.)；Starch grafted acrylate crosslinking copolymerization thing (starch grafted acrylate).
Preferably, the particle diameter of plant ash is less than or equal to 5mm.
Preferably, it is the 50~70% of field saturation moisture capacity that soil moisture is maintained in repair process.
Preferably, repairing efficiency is 60~120 days.
9. a kind of method that sludge is dissolved, methods described is that the heavy metal sewage sludge soil-repairing agent described in usage right requirement 6 enters
Row sludge is dissolved.
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