CN105251446A - Underground water compound heavy metal pollution remediation material - Google Patents
Underground water compound heavy metal pollution remediation material Download PDFInfo
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- CN105251446A CN105251446A CN201510764403.8A CN201510764403A CN105251446A CN 105251446 A CN105251446 A CN 105251446A CN 201510764403 A CN201510764403 A CN 201510764403A CN 105251446 A CN105251446 A CN 105251446A
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Abstract
The invention discloses an underground water compound heavy metal pollution remediation material. The material is prepared from, by weight, 1 part of activated carbon, 1.3-2 parts of zeolite and 5-17 parts of steel slag. The raw materials are evenly mixed and granulated and are then baked for 1-5 h at a temperature of 150 DEG C to 200 DEG C, and then the remediation material is obtained. By mixing the different materials, underground water polluted by various types of heavy metal in a compound mode is highly efficiently remedied through various synthetic effects of the material on the aspects of the heavy metal adsorption capacity improvement, physical and chemical property improvement and the like; the effect of fixing compound heavy metal in underground water is remarkable, the content of heavy metal in underground water can be remarkably reduced, and ecological safety is guaranteed; the material is suitable for underground water polluted by heavy metal to different extents, the material can make contact with underground water for different durations of time according to actual situations so that the removal effect can be improved, and a fixing agent is low in cost, economical and feasible.
Description
Technical field
The present invention relates to a kind of underground water Compound Heavy Metals repair materials, belong to underground water heavy metal pollution recovery technique field.
Background technology
Underground water is one of mankind's natural resources of depending on for existence.Along with developing rapidly of modern industry and agricultural, three industrial wastes and make the pollution of heavy metal in underground water become the principal element affecting Groundwater Environmental Quality containing heavy metal agricultural chemicals, using in a large number of fertilizer.Heavy metal pollution and Environmental and ecological problems have badly influenced economic sustainable development and the health of the mankind, receive the extensive concern of people from all walks of life.In recent years, heavy-metal composite pollution is on the rise.In order to fundamentally prevent heavy metal entered environment and food chain, must repair heavy metal pollution in underground water, reducing the absorption and accumulation of biological heavy metal.Underground water heavy metal pollution recovery technique mainly comprises physics, chemistry and biological prosthetic three kinds, various technology have again original position and dystopy point, wherein in-situ chemical reparation have simple to operate, cost is low, time-consuming short, efficiency advantages of higher and being widely studied.
CN201410430508 discloses a kind of Novel underground water heavy metal pollution repair materials, and the liquor ferri trichloridi being 2.5-3 by interpolation pH carries out modified to sawdust, makes it significantly improve the absorption property of chromium, for the process of the chromium in underground water; CN201310153057, CN200910272494 and CN201010203313 individually disclose the method for removing arsenic in water, the useful sulfuric acid solution of the material related to soak natural iron content manganese ore, rutile, titaniferous manganese material, containing Ferromanganese Ore, sharp state type nano titanium oxide 5-15kg; Activated coco nut charcoal 10-20kg, Portland cement etc.Above-mentioned patent is only remove for single heavy metal, and in fact underground water heavy metal pollution is main mainly with combined pollution, and therefore, above-mentioned patent can not for the treatment of the underground water of Compound Heavy Metals.
Summary of the invention
The technical problem that the present invention solves is that underground water is polluted by various heavy and is difficult to once be repaired, and provides a kind of repair materials simultaneously can removing various heavy, can not introduce new impurity, not polluted underground water simultaneously; Simultaneously with low cost, advantages of good adsorption effect.
Technical scheme of the present invention is, provides a kind of underground water Compound Heavy Metals repair materials, by weight, comprises following raw material: active carbon 1 part, zeolite 1.3-2 part and slag 5-17 part; By above-mentioned raw materials through mixing, granulate after at 150-200 DEG C roasting 1-5h obtain described repair materials.
Further, the raw material of described repair materials also comprises the bentonite being no more than 2 parts and the nano titanium oxide being no more than 0.5 part.
Further, described nano titanium oxide is sharp state type nano titanium oxide.
Further, described active carbon is activated coco nut charcoal.
Further, the granularity of described active carbon, zeolite and slag is 60-120 order.
Underground water Compound Heavy Metals repair materials prepared by the present invention is all selected from ubiquitous material in environment, nontoxic and low price.According to market constant price, often prepare 1 ton of sorbing material of the present invention, about need cost RMB 250-500 unit.
Underground water Compound Heavy Metals fixative prepared by the present invention has good repairing effect.In theory, for the underground water that Compound Heavy Metals is more serious, the amount of fixative suitably to be increased; And for the lighter underground water of Compound Heavy Metals, can addition be reduced.It should be noted that, in underground water Compound Heavy Metals, each heavy metal pollution degree is different, therefore, for the heavy metal that pollution level is large, can change the sorbing material ratio that fixative is used, to reach best repair effect.If be no longer subject to heavy metal pollution through the polluted underground water repaired, and large change does not occur water chemistry property, can not there is secondary pollution in this underground water again.
The various materials that the present invention utilizes are the common material being easy to obtain.It is not high to there is removal ability in single material when removal heavy metal, or only can remove a kind of or a class heavy metal or single composite material physicochemical properties and be not suitable for the shortcomings such as practical application.Therefore be necessary, by different combinations of materials, to be optimized proportioning and modification simultaneously, utilize the synergy of different materials thus the reparation realized various heavy polluted underground water.In the sorbing material of sampling, each sorbing material is had nothing in common with each other for different heavy metal adsorption and mechanism:
Slag all has very strong absorption crystallized ability to arsenic, lead, zinc, cadmium.Trivalent arsenic can be oxidized to pentavalent arsenic by one side iron and manganese oxides wherein, on the other hand, slag has alkalescence and has large surface area, and surface site is many, have very strong adsorption crystallized ability to various heavy, to be that physical property is bad be not suitable for practical application to its shortcoming simultaneously.
Nano titanium oxide is also very strong to the direct oxidation effect of arsenic.Its surface charge is high, specific area large, has abundant activated adoption site, better to the adsorption effect of pentavalent arsenic.And for Cd
2+, Pb
2+, Zn
2+etc. heavy metal ion, also having stronger surface and Inter layer adsorption ability, is also heavy metal adsorption immobilization material, but its shortcoming to be price high.
The three-dimensional structure of zeolite makes it have very large space; Secondly, Al in tetrahedron
3+replace Si
4+partial-band negative electrical charge can be produced again; The positively charged exchangeable ion such as Na, Ca, K often occupies the space in structure, and being positioned at cation Na and Ca of passage etc. and Si-Al backbone in zeolite, to contact power more weak, can not destroyed character by other cation replacements.Therefore, these positively charged exchangeable ions can substitute for heavy metal cations such as cadmium, lead, copper, zinc by treated zeolite, thus reach the effect of removal heavy metal.
Montmorillonite is bentonitic main mineral constituent, the isomorph occurred in montmorillonite octahedral layer, and can strengthen the degree of contact between construction unit layer and not easily disperse, heavy metal ion has good exchangeability and Selective adsorption.Montmorillonite is immersed after being modified in electrolyte solution, as Ca
2+matter montmorillonite is processed into Na
+matter montmorillonite, its inter-layer bonding force diminishes and easily disperses, to expand and hydrophilic, and make cation easily in diffusing into interlamination region, thus greatly improve velocity of ion exchange, therefore sodium bentonite is to Cd
2+, Pb
2+, Zn
2+etc. the ion exchangeable of heavy metal ion and adsorbance apparently higher than general bentonite, but, montmorillonite is bad to heavy mental treatment effects such as the arsenic of anionic type.
Active carbon is owing to having micropore that is multistage, a large amount of, ordered arrangement, and therefore pore volume is large, aperture large, and specific area is large, and absorption property is strong, effectively can adsorb Cd
2+, Pb
2+, Cu
2+etc. heavy metal ion.
Experiment shows, various material has his own strong points, and makes full use of the synergy of different materials, just can realize being modified for use to the removal of Compound Heavy Metals.Therefore, in the underground water of Compound Heavy Metals, adopt original position permeable reactive wall technology to add a certain proportion of above-mentioned fixative material, can effectively remove each heavy metal.And fixative adds higher, underground water time of staying in PRB is longer, then stronger to the removal ability of heavy metal in underground water.
The invention has the beneficial effects as follows, by mixture different materials, utilize between material raising heavy metal adsorption, improve the multiple cooperative effects such as physics and chemistry proterties, achieve first and the underground water of various heavy combined pollution efficiently repaired.Therefore, the present invention has more actual use value; Fixative material requested of the present invention is common, and preparation process is very simple, is mixed with by the raw material through selecting; The present invention is obvious to Compound Heavy Metals in underground water (As, Cd, Pb, Zn) fixed effect, can significantly reduce underground water content of beary metal, ensures ecological safety; The present invention is suitable for heavy metal pollution underground water in various degree, and the time that them can be made different from groundwater contacts according to actual conditions is to improve removal effect, and fixative is with low cost, economically feasible.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described.
Embodiment 1
The present embodiment provides a kind of underground water Compound Heavy Metals repair materials, and by weight, raw material is made up of 1 part of active carbon (100 order), 2 parts of zeolites (80 order) and 17 parts of slags (100 order); By above-mentioned raw materials through mixing, making about 2cm spherical particle through Squeezinggranulator again, then roasting 3h obtains described repair materials at 180 DEG C.
Embodiment 2
The present embodiment provides a kind of underground water Compound Heavy Metals repair materials, by weight, raw material is made up of 1 part of activated coco nut charcoal (100 order), 1.5 parts of zeolites (100 order), 2 parts of bentonites (100 order), 0.5 part of nano titanium oxide and 5 parts of slags (80 order); By above-mentioned raw materials through mixing, making about 1.7cm spherical particle through Squeezinggranulator again, then roasting 4h obtains described repair materials at 160 DEG C.
Embodiment 3
The present embodiment provides a kind of underground water Compound Heavy Metals repair materials, by weight, raw material is made up of 1 part of activated coco nut charcoal (100 order), 1.3 parts of zeolites (100 order), 1.3 parts of bentonites (100 order), 0.4 part of nano titanium oxide and 10 parts of slags (100 order); By above-mentioned raw materials through mixing, making about 2.5cm spherical particle through Squeezinggranulator again, then roasting 2h obtains described repair materials at 200 DEG C.
Embodiment 4
Respectively the repair materials that embodiment 1,2,3 obtains is used for simulated test, step is as follows: take various repair materials sample 5.00g, be placed in 1000mL vial, adding 500mL background ionic strength is NaCl=40mmol/L, As (III), Pb, Zn, Cd ion concentration are respectively 10.00mg/L, 25mg/L, 40mg/L, 50mg/L and solution, 2h(rotating speed 180r/min is shaken at 25 DEG C), filter, cross 0.46 μm of filter membrane.Sample thief liquid measures each content of beary metal.Each sample repeats 3 times.The test data of each embodiment is comparatively close, and underground water arsenic reduces 99.8-99.9%; Cadmium reduces 99.5-99.8%; Lead reduces 99.2-99.5%; Zinc reduces 99.2-99.8%.
Embodiment 5
Get Certain District, Hunan gangue landfill yard underground water, record As, Pb, Zn, Cd heavy metal concentration and be respectively 0.135mg/L, 0.108mg/L, 0.401mg/L, 0.110mg/L, pH6.1; Test by the test procedure of embodiment 4; Result of the test is: underground water arsenic reduces 99.8-99.9%; Cadmium reduces 99.8-100%; Lead reduces 99.2-99.5%; Zinc reduces 99.5-100%.
Embodiment 6
Get Lead-zinc Deposits of Certain District, Hunan landfill yard underground water, record As, Pb, Zn, Cd heavy metal concentration and be respectively 0.087mg/L, 0.708mg/L, 1.201mg/L, 0.140mg/L, pH6.4.Test by the test procedure of embodiment 4; Result of the test is: underground water arsenic reduces 99.9%-100%; Cadmium reduces 99.7-100%; Lead reduces 99.5-99.7%; Zinc reduces 99.8-100%.
Claims (5)
1. a underground water Compound Heavy Metals repair materials, is characterized in that, by weight, comprises following raw material:
Active carbon 1 part, zeolite 1.3-2 part and slag 5-17 part;
By above-mentioned raw materials through mixing, granulate after at 150-200 DEG C roasting 1-5h obtain described repair materials.
2. repair materials as claimed in claim 1, is characterized in that, the raw material of described repair materials also comprises the bentonite being no more than 2 parts and the nano titanium oxide being no more than 0.5 part.
3. repair materials as claimed in claim 2, it is characterized in that, described nano titanium oxide is sharp state type nano titanium oxide.
4. repair materials as claimed in claim 1, it is characterized in that, described active carbon is activated coco nut charcoal.
5. repair materials as claimed in claim 1, it is characterized in that, the granularity of described active carbon, zeolite and slag is 60-120 order.
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Cited By (5)
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| CN105948165A (en) * | 2016-06-23 | 2016-09-21 | 中国有色桂林矿产地质研究院有限公司 | Method for regulating permeability of permeable reactive barrier (PRB) |
| CN109012641A (en) * | 2018-08-29 | 2018-12-18 | 宝钢湛江钢铁有限公司 | A kind of preparation method of modified steel scoria heavy metal absorbent |
| CN111346591A (en) * | 2020-03-20 | 2020-06-30 | 中国科学院过程工程研究所 | Iron-based-bentonite/carbon composite porous material, and preparation method and application thereof |
| CN111790352A (en) * | 2020-06-28 | 2020-10-20 | 中国地质大学（武汉） | Adsorbent capable of removing heavy metals in industrial wastewater and preparation method thereof |
| CN114132984A (en) * | 2021-11-10 | 2022-03-04 | 同济大学 | Method for treating heavy metals in underground water |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105948165A (en) * | 2016-06-23 | 2016-09-21 | 中国有色桂林矿产地质研究院有限公司 | Method for regulating permeability of permeable reactive barrier (PRB) |
| CN109012641A (en) * | 2018-08-29 | 2018-12-18 | 宝钢湛江钢铁有限公司 | A kind of preparation method of modified steel scoria heavy metal absorbent |
| CN111346591A (en) * | 2020-03-20 | 2020-06-30 | 中国科学院过程工程研究所 | Iron-based-bentonite/carbon composite porous material, and preparation method and application thereof |
| CN111346591B (en) * | 2020-03-20 | 2021-07-09 | 中国科学院过程工程研究所 | Iron-based-bentonite/carbon composite porous material, and preparation method and application thereof |
| CN111790352A (en) * | 2020-06-28 | 2020-10-20 | 中国地质大学（武汉） | Adsorbent capable of removing heavy metals in industrial wastewater and preparation method thereof |
| CN114132984A (en) * | 2021-11-10 | 2022-03-04 | 同济大学 | Method for treating heavy metals in underground water |
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Address after: No. 16, camphor East Road, Yuhua District, Changsha, Hunan Patentee after: POWERCHINA ZHONGNAN ENGINEERING Corp.,Ltd. Patentee after: China Power Construction Environmental Protection Technology Co.,Ltd. Address before: No. 16, camphor East Road, Yuhua District, Changsha, Hunan Patentee before: POWERCHINA ZHONGNAN ENGINEERING Corp.,Ltd. Patentee before: Hunan Zhongnan Water Environmental Protection Technology Co.,Ltd. |
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