CN107880894A - A kind of preparation method and application of Cd-Pb contaminated soil repair materials - Google Patents
A kind of preparation method and application of Cd-Pb contaminated soil repair materials Download PDFInfo
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- CN107880894A CN107880894A CN201711135196.5A CN201711135196A CN107880894A CN 107880894 A CN107880894 A CN 107880894A CN 201711135196 A CN201711135196 A CN 201711135196A CN 107880894 A CN107880894 A CN 107880894A
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- contaminated soil
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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
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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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
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
- C09K17/08—Aluminium compounds, e.g. aluminium hydroxide
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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
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2101/00—Agricultural use
Abstract
The invention discloses a kind of preparation method and application of Cd-Pb contaminated soil repair materials.Preparation method step is：Bentonite is dispersed in water, ultrasound, sodium salt is added, adds charcoal, stir, adds sodium acid carbonate, is separated, is dried.A kind of method for preparing modified bentonite, comprises the following steps：1) water is added to be made into the solution of certain mass fraction natural calcium-base bentonite；2) a certain amount of sodium carbonate, stirring are added；3) a certain amount of sodium acid carbonate is added, adjusts pH；4) filter, with alcohol flushing, dry, grind, sieving.Application of the Cd-Pb contaminated soil repair materials of preparation in Cd-Pb contaminated soil in-situ immobilization.The in-situ remediation method of Cd-Pb contaminated soil, the cupro-nickel contaminated soil remediation material of preparation is added in soil, turned over, be well mixed.Repair materials prepared by the present invention are applied to the in-situ immobilization of Cd-Pb contaminated soil, and remediation efficiency is high.
Description
Technical field
The present invention relates to the technical field of soil remediation, and in particular to a kind of preparation side of Cd-Pb contaminated soil repair materials
Method and application.
Background technology
As expanding economy and urbanization, the quickening of process of industrialization, heavy metal pollution of soil problem are more and more prominent.
At present, the recovery technique of heavy-metal contaminated soil is broadly divided into two classes：In-situ immobilization and showering.Wherein showering due to
The features such as high cost and big quantities, is only applicable to small area, sudden serious pollution soil.In-situ immobilization mainly includes：Physics
Reparation, biological prosthetic, chemical remediation etc..By selecting suitable soil conditioner, heavy metal is carried out wherein chemical restoration
Absorption, redox, precipitation etc. reduce the biological effectiveness of heavy metal, due to the easy to operate and quick characteristic of improvement, make it
As the study hotspot of contaminated soil remediation in recent years.Charcoal is method of the biomass rich in carbon by thermal cracking, is being lacked
Manufactured a kind of charing material high rich in pore structure, phosphorus content under conditions of oxygen or few oxygen.Charcoal prepares raw material
Source is extensive, agriculture and forestry discarded object (such as timber, stalk, shell) and industry and urban life in caused organic waste (such as
Rubbish, sludge) it can serve as raw material.Charcoal has larger specific surface area, high ph-values, more surface functional group and micro-
Pore structure, important shadow is all produced to nutrient holding, water and soil utilization, soil texture, heavy metal and organic pollution biological effectiveness
Ring.The experimental results show that charcoal is in soil nutrient holding, soil physico-chemical property improves and heavy metal pollution of soil reparation
In show positive effect, be expected to develop into effective heavy metal modifying agent.
The content of the invention
It is an object of the invention to provide a kind of preparation method and application of lead-contaminated soil repair materials.
The technical solution used in the present invention is：
A kind of preparation method of Cd-Pb contaminated soil repair materials, including the steps：
Modified alta-mud is dispersed in water, after supersound process, sodium salt is added, adds charcoal, after stirring, add
Enter sodium acid carbonate, separate, dry；Described bentonite, sodium salt, the mass ratio of charcoal are 1.5~2.5:0.6~1.5:5~
20。
Preferably, the modified alta-mud is prepared using following method：
(1) water is added to be made into the solution of certain mass calcium-base bentonite；
(2) sodium salt, stirring, sodium are added；
(3) sodium acid carbonate is added, adjusts pH：
(4) water is filtered away, with alcohol flushing, is ground after drying.
Preferably, step 2) is specially：The sodium salt is sodium carbonate；The mol ratio of the calcium-base bentonite and sodium salt is 2:
1。
Preferably, the charcoal is prepared using following method：
1) dry：Dried after pharmacy discarded object is crushed；
2) it is pyrolyzed：Dried pharmacy discarded object is put into crucible, is placed in the Muffle furnace of inert gas shielding, with 40
~55 DEG C/min is warming up to 500~700 DEG C, is pyrolyzed 1~3h at such a temperature, and Muffle furnace is cooled to room temperature, takes out black solid,
Grinding, screening.
Preferably, described pharmacy discarded object is Chinese medicine slag.
A kind of application of Cd-Pb contaminated soil repair materials in cadmium lead contamination agricultural land soil in-situ immobilization, carry out original position and repair
When multiple, above-mentioned lead-contaminated soil repair materials are added in soil, turned over, be well mixed.
The beneficial effects of the invention are as follows：
Sodium bentonite prepared by the present invention has that specific surface area is big, and pH value is high, and characteristic, the sodium bases such as microcellular structure is abundant are swollen
The repair materials that profit soil is combined with quick lime, can improve the solidification effect to soil cupro-nickel；The recovery technique is suitable for original
Position is repaired, and material preparation method is simple；Sodium bentonite of the present invention is prepared using calcium-base bentonite, China day
Right bentonite is in the majority with calcium-base bentonite, therefore material preparation cost is low；Charcoal of the present invention is to utilize discarded object Chinese medicine
What slag was prepared, material preparation cost is low, is advantageous to the recycling of resource, turns waste into wealth；Repair materials of the present invention
It is high available for the reparation of higher concentration lead-contaminated soil, remediation efficiency.
Brief description of the drawings
Fig. 1 is the SEM image of charcoal prepared by embodiment 1.
Fig. 2 is repairing effect of the different materials of embodiment 5 to cadmium in soil；
Fig. 3 is repairing effect of the charcoal to lead of the different materials of embodiment 5；
Fig. 4 is repairing effect of the different dosage repair materials of embodiment 6 to cadmium；
Fig. 5 is repairing effect of the different dosage repair materials of embodiment 6 to lead.
Embodiment
Technical scheme is described in detail below by specific embodiment, but the scope of the present invention
It is not restricted by the embodiments.
Embodiment 1
A kind of preparation method of charcoal is present embodiments provided, is comprised the following steps：
1) dry：After pharmacy discarded object is crushed, dry；
2) it is pyrolyzed：Weigh a certain amount of dried Chinese medicine slag and be warming up to 600 DEG C under nitrogen protection with 10 DEG C/min, at this
At a temperature of continue to be pyrolyzed 2h, Muffle furnace takes out after being cooled to room temperature, grinds, and crosses 120 mesh sieves and is sealed.
Embodiment 2
A kind of preparation method of sodium bentonite is present embodiments provided, is specifically comprised the following steps：
1) water is added to be made into the solution of 10% mass fraction natural calcium-base bentonite；
2) it is 2 to add mol ratio:1 sodium carbonate, stirring, sodium；
3) a certain amount of sodium acid carbonate is added, regulation pH is 9；
3) filter, with alcohol flushing, dry, grinding, cross 120 mesh sieves.
Embodiment 3
A kind of preparation method of Cd-Pb contaminated soil repair materials is present embodiments provided, step is：Embodiment 1 is made
Bentonite is dispersed in water, ultrasonic 30min, is added sodium carbonate, charcoal made from addition embodiment 2, is stirred, add carbon
Sour hydrogen sodium regulation pH is about 9, separates, dries.
Embodiment 4
The preparation of manual simulation's Cd-Pb contaminated soil：This example uses laboratory test, is to pick up from Guangzhou kind for examination soil
The not comtaminated soil in Yu area, air-dried after collection, cross 60 mesh sieves, sealed storage is standby in drier.
The preparation method of Cd-Pb contaminated soil is as follows：
(1) above-mentioned soil 1000g is weighed in beaker, adds 1500ml cadmium nitrates, lead nitrate solution, electric stirring；
(2) after having stirred, centrifugation, then soil is washed with deionized, supernatant is collected by centrifugation；
(3) by soil sample air-dry, grinding, it is placed in wide-mouth bottle；
(4) after soil pollution is cleared up using Acid digestion method, with 0.45 μm of membrane filtration, divided with Flame Atomic Absorption Spectrometry
Pb in light photometric determination digestion solution and supernatant2+、Cd2+Concentration；
(5) Pb in soil2+、Cd2+Content calculated according to mass conservation law, i.e. the Pb by being added in soil2+、Cd2+
Total amount subtracts the Pb contained in supernatant2+、Cd2+Measure, Pb, Cd content are 298.7 and 2.91mg/kg in final soil.
Embodiment 5
Material is probed into the repairing effect of cadmium lead in soil under this different time：
10g Polluted Soils are weighed in 100ml centrifuge tubes, calcium base swelling is added with 2%, 2%, 2%, 2% (w/w) ratio
Soil, sodium bentonite, charcoal and Cd-Pb contaminated soil repair materials, one group of control, every group 3 parallel, and each soil sample adds
A certain amount of deionized water, after shaking up, centrifuge tube is placed on oscillator, repaired respectively under room temperature condition 1d, 7d, 14d, 21d,
28d。
Repairing effect for evaluation Cd-Pb contaminated soil repair materials to Cd-Pb contaminated soil, determined and repaired using DTPA methods
Front and rear soil available Cd lead content, is concretely comprised the following steps：Supernatant is removed into pedotheque centrifugation after reparation, with graduated cylinder plus
Enter 50mL extractants, be placed on oscillation device, under room temperature (25 ± 2 DEG C), rotating speed 180r/min, extract 2h.Remove, from
The heart, filtering, with the concentration of cadmium lead in flame atomic absorption spectrometry filtrate.The calculation formula of available Cd lead repair rate is as follows：
Repair rate (%)=(cadmium lead concentration/control group concentration in soil filtrate after 1- is repaired) × 100%
From accompanying drawing 2,4 kinds of materials increase Cd repairing effect and strengthened with repair time.After repairing 28d, calcium
Base bentonite, sodium bentonite, calcium oxide and Cd-Pb contaminated soil repair materials are respectively 43% to the repair rate of cadmium, lead,
47%th, 45% and 51%；Fig. 3 can clearly show that Cd-Pb contaminated soil repair materials are optimal to the repairing effect of lead, reach 61%
Embodiment 6
Material optimum dosage determines experiment：
To probe into influence of the dosage of Cd-Pb contaminated soil repair materials to the solidification effect of cadmium lead in soil, it is determined that most
Good dosage, 5 experimental groups are set respectively, and every group of 10g soil, 15ml water, three parallel.Cd-Pb contaminated soil repair materials
Dosage is 0,1%, 3%, 5% and 7% (w/w).Sample is placed in shaking table, through 1d, 3d, 7d, 14d, 21d, after 28d, adopted
With the concentration of the method measure cadmium lead in above-described embodiment 5.From accompanying drawing 4, when repair time is from 21d to 28d, material pair
The change of Cd repair rate tends to be parallel, therefore selects 21d to be repaired for the best repair time.After repairing 28d, Cd-Pb contaminated soil is repaiied
Influence of the dosage of multiple material to the repairing effect of cadmium in soil is as shown in Figure 4.Accompanying drawing 5 shows, Cd-Pb contaminated soil reparation
Material increases with the increase of dosage the repair rate of lead, and when dosage increases to 7% by 1%, repair rate is maximum at 5%
For 63%, therefore determine that 5% is the optimum dosage of Cd-Pb contaminated soil repair materials.
Claims (6)
1. a kind of preparation method of Cd-Pb contaminated soil repair materials, it is characterised in that including the steps：
Modified alta-mud is dispersed in water, after supersound process, sodium salt is added, adds charcoal, after stirring, adds carbon
Sour hydrogen sodium, separate, dry；Described bentonite, sodium salt, the mass ratio of charcoal are 1.5~2.5:0.6~1.5:5~20.
2. the preparation method of Cd-Pb contaminated soil repair materials according to claim 1, it is characterised in that：The modification is swollen
Profit soil is prepared using following method：
(1) water is added to be made into the solution of certain mass calcium-base bentonite；
(2) sodium salt, stirring, sodium are added；
(3) sodium acid carbonate is added, adjusts pH：
(4) water is filtered away, with alcohol flushing, is ground after drying.
3. the preparation method of Cd-Pb contaminated soil repair materials according to claim 2, it is characterised in that：The modification is swollen
It is sodium carbonate to moisten sodium salt in the step (2) of soil；The mol ratio of calcium-base bentonite and sodium salt is 2:1.
4. the preparation method of Cd-Pb contaminated soil repair materials according to claim 3, it is characterised in that：The charcoal
Prepared using following method：
1) dry：Dried after pharmacy discarded object is crushed；
2) it is pyrolyzed：Dried pharmacy discarded object is put into crucible, is placed in the Muffle furnace of inert gas shielding, with 40~55
DEG C/min is warming up to 500~700 DEG C, is pyrolyzed 1~3h at such a temperature, Muffle furnace is cooled to room temperature, takes out black solid, grinds
Mill, screening.
5. the preparation method of Cd-Pb contaminated soil repair materials according to claim 4, it is characterised in that：Described pharmacy
Discarded object is Chinese medicine slag.
6. a kind of any described Cd-Pb contaminated soil repair materials of claim 1-5 are in cadmium lead contamination agricultural land soil in-situ immobilization
In application, it is characterised in that：When carrying out in-situ immobilization, above-mentioned lead-contaminated soil repair materials are added in soil, turned over,
It is well mixed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711135196.5A CN107880894A (en) | 2017-11-16 | 2017-11-16 | A kind of preparation method and application of Cd-Pb contaminated soil repair materials |
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| CN201711135196.5A CN107880894A (en) | 2017-11-16 | 2017-11-16 | A kind of preparation method and application of Cd-Pb contaminated soil repair materials |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108906875A (en) * | 2018-07-05 | 2018-11-30 | 安徽袁粮水稻产业有限公司 | A kind of method for comprehensive repairing of lead contamination rice soil |
| CN110746976A (en) * | 2019-10-16 | 2020-02-04 | 北京乾景园林股份有限公司 | Soil remediation agent for passivating soil heavy metals and preparation method thereof |
| US11124461B2 (en) | 2019-07-04 | 2021-09-21 | Incitec Pivot Limited | Fertilizer |
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| CN105131960A (en) * | 2015-06-26 | 2015-12-09 | 华南师范大学 | Preparation method and application of lead-polluted soil restoration material |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108906875A (en) * | 2018-07-05 | 2018-11-30 | 安徽袁粮水稻产业有限公司 | A kind of method for comprehensive repairing of lead contamination rice soil |
| US11124461B2 (en) | 2019-07-04 | 2021-09-21 | Incitec Pivot Limited | Fertilizer |
| US11691929B2 (en) | 2019-07-04 | 2023-07-04 | Incitec Fertilizers Pty Limited | Fertiliser |
| CN110746976A (en) * | 2019-10-16 | 2020-02-04 | 北京乾景园林股份有限公司 | Soil remediation agent for passivating soil heavy metals and preparation method thereof |
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Application publication date: 20180406 |
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