CN107188382B - Method for removing polycyclic aromatic hydrocarbon in sediment in situ - Google Patents
Method for removing polycyclic aromatic hydrocarbon in sediment in situ Download PDFInfo
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- CN107188382B CN107188382B CN201710447620.3A CN201710447620A CN107188382B CN 107188382 B CN107188382 B CN 107188382B CN 201710447620 A CN201710447620 A CN 201710447620A CN 107188382 B CN107188382 B CN 107188382B
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- 239000013049 sediment Substances 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 13
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 title claims abstract description 7
- 238000001179 sorption measurement Methods 0.000 claims abstract description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 46
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 18
- 241000132906 Tubificidae Species 0.000 claims description 8
- XJWSAJYUBXQQDR-UHFFFAOYSA-M dodecyltrimethylammonium bromide Chemical compound [Br-].CCCCCCCCCCCC[N+](C)(C)C XJWSAJYUBXQQDR-UHFFFAOYSA-M 0.000 claims description 8
- DAJSVUQLFFJUSX-UHFFFAOYSA-M sodium;dodecane-1-sulfonate Chemical compound [Na+].CCCCCCCCCCCCS([O-])(=O)=O DAJSVUQLFFJUSX-UHFFFAOYSA-M 0.000 claims description 8
- 229910052799 carbon Inorganic materials 0.000 claims description 6
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- 238000001914 filtration Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
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- 230000000593 degrading effect Effects 0.000 claims description 2
- 238000009210 therapy by ultrasound Methods 0.000 claims description 2
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- 230000009467 reduction Effects 0.000 abstract description 2
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- 239000003945 anionic surfactant Substances 0.000 description 3
- 239000003093 cationic surfactant Substances 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- GVEPBJHOBDJJJI-UHFFFAOYSA-N fluoranthrene Natural products C1=CC(C2=CC=CC=C22)=C3C2=CC=CC3=C1 GVEPBJHOBDJJJI-UHFFFAOYSA-N 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 230000004083 survival effect Effects 0.000 description 3
- DXBHBZVCASKNBY-UHFFFAOYSA-N 1,2-Benz(a)anthracene Chemical compound C1=CC=C2C3=CC4=CC=CC=C4C=C3C=CC2=C1 DXBHBZVCASKNBY-UHFFFAOYSA-N 0.000 description 2
- FMMWHPNWAFZXNH-UHFFFAOYSA-N Benz[a]pyrene Chemical compound C1=C2C3=CC=CC=C3C=C(C=C3)C2=C2C3=CC=CC2=C1 FMMWHPNWAFZXNH-UHFFFAOYSA-N 0.000 description 2
- GYFAGKUZYNFMBN-UHFFFAOYSA-N Benzo[ghi]perylene Chemical group C1=CC(C2=C34)=CC=C3C=CC=C4C3=CC=CC4=CC=C1C2=C43 GYFAGKUZYNFMBN-UHFFFAOYSA-N 0.000 description 2
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 2
- -1 Polycyclic aromatic compounds Chemical class 0.000 description 2
- MWPLVEDNUUSJAV-UHFFFAOYSA-N anthracene Chemical compound C1=CC=CC2=CC3=CC=CC=C3C=C21 MWPLVEDNUUSJAV-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- WDECIBYCCFPHNR-UHFFFAOYSA-N chrysene Chemical compound C1=CC=CC2=CC=C3C4=CC=CC=C4C=CC3=C21 WDECIBYCCFPHNR-UHFFFAOYSA-N 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
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- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
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- YNPNZTXNASCQKK-UHFFFAOYSA-N phenanthrene Chemical compound C1=CC=C2C3=CC=CC=C3C=CC2=C1 YNPNZTXNASCQKK-UHFFFAOYSA-N 0.000 description 2
- 239000002352 surface water Substances 0.000 description 2
- LGERRYPEGFPVAJ-UHFFFAOYSA-N 1,12-phenyleneperylene Natural products C1=C2C3=CC=CC=C3C3=CC=C(C=CC=C45)C4=C3C2=C2C5=CC=CC2=C1 LGERRYPEGFPVAJ-UHFFFAOYSA-N 0.000 description 1
- KHNYNFUTFKJLDD-UHFFFAOYSA-N BCR-49 Natural products C1=CC(C=2C3=CC=CC=C3C=CC=22)=C3C2=CC=CC3=C1 KHNYNFUTFKJLDD-UHFFFAOYSA-N 0.000 description 1
- TXVHTIQJNYSSKO-UHFFFAOYSA-N BeP Natural products C1=CC=C2C3=CC=CC=C3C3=CC=CC4=CC=C1C2=C34 TXVHTIQJNYSSKO-UHFFFAOYSA-N 0.000 description 1
- HAXBIWFMXWRORI-UHFFFAOYSA-N Benzo[k]fluoranthene Chemical compound C1=CC(C2=CC3=CC=CC=C3C=C22)=C3C2=CC=CC3=C1 HAXBIWFMXWRORI-UHFFFAOYSA-N 0.000 description 1
- 206010007269 Carcinogenicity Diseases 0.000 description 1
- 241000195493 Cryptophyta Species 0.000 description 1
- 208000037534 Progressive hemifacial atrophy Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 125000004054 acenaphthylenyl group Chemical group C1(=CC2=CC=CC3=CC=CC1=C23)* 0.000 description 1
- HXGDTGSAIMULJN-UHFFFAOYSA-N acetnaphthylene Natural products C1=CC(C=C2)=C3C2=CC=CC3=C1 HXGDTGSAIMULJN-UHFFFAOYSA-N 0.000 description 1
- 239000008346 aqueous phase Substances 0.000 description 1
- FTOVXSOBNPWTSH-UHFFFAOYSA-N benzo[b]fluoranthene Chemical compound C12=CC=CC=C1C1=CC3=CC=CC=C3C3=C1C2=CC=C3 FTOVXSOBNPWTSH-UHFFFAOYSA-N 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 230000007670 carcinogenicity Effects 0.000 description 1
- 231100000260 carcinogenicity Toxicity 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- LHRCREOYAASXPZ-UHFFFAOYSA-N dibenz[a,h]anthracene Chemical compound C1=CC=C2C(C=C3C=CC=4C(C3=C3)=CC=CC=4)=C3C=CC2=C1 LHRCREOYAASXPZ-UHFFFAOYSA-N 0.000 description 1
- 241001233061 earthworms Species 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- GVEPBJHOBDJJJI-RHRFEJLCSA-N fluoranthene Chemical compound C1=CC(C2=CC=CC=C22)=C3C2=CC=CC3=[14CH]1 GVEPBJHOBDJJJI-RHRFEJLCSA-N 0.000 description 1
- RMBPEFMHABBEKP-UHFFFAOYSA-N fluorene Chemical compound C1=CC=C2C3=C[CH]C=CC3=CC2=C1 RMBPEFMHABBEKP-UHFFFAOYSA-N 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 230000007674 genetic toxicity Effects 0.000 description 1
- 231100000025 genetic toxicology Toxicity 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000299 mutagenicity Toxicity 0.000 description 1
- 230000007886 mutagenicity Effects 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- NIHNNTQXNPWCJQ-UHFFFAOYSA-N o-biphenylenemethane Natural products C1=CC=C2CC3=CC=CC=C3C2=C1 NIHNNTQXNPWCJQ-UHFFFAOYSA-N 0.000 description 1
- HGASFNYMVGEKTF-UHFFFAOYSA-N octan-1-ol;hydrate Chemical compound O.CCCCCCCCO HGASFNYMVGEKTF-UHFFFAOYSA-N 0.000 description 1
- 238000012017 passive hemagglutination assay Methods 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 238000011197 physicochemical method Methods 0.000 description 1
- 229920000903 polyhydroxyalkanoate Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/34—Treatment of water, waste water, or sewage with mechanical oscillations
- C02F1/36—Treatment of water, waste water, or sewage with mechanical oscillations ultrasonic vibrations
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/32—Hydrocarbons, e.g. oil
- C02F2101/327—Polyaromatic Hydrocarbons [PAH's]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/007—Contaminated open waterways, rivers, lakes or ponds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/04—Surfactants, used as part of a formulation or alone
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
Abstract
The invention discloses a method for removing polycyclic aromatic hydrocarbon in river water system sediment in situ, which comprises the steps of placing ultrasonic adsorption combined equipment into river water system sediment containing PAHs, then raising benthonic animals in a treated area to activate the activity of microorganisms in the sediment, planting submerged plant, namely, foxtail and/or ryegrass in shallow water in the treated area, removing the PAHs in the river water system sediment on the basis of not changing the natural ecological environment of the river water system in situ by combining physical, chemical and biological three-in-one modes, and simultaneously improving the activity of aquatic organisms and aquatic plants in a river basin to purify the water system; the method can realize reduction and elimination of pollutants in situ under the conditions of no need of moving the sediment, no additional construction of a treatment site and no damage to the natural environment of the sediment of the water body, and has simple operation and low running cost.
Description
Technical Field
The invention belongs to the technical field of organic pollution treatment, relates to a treatment method of organic pollutants in river water system sediments, and particularly relates to a method for removing polycyclic aromatic hydrocarbon in the river water system sediments in situ.
Background
Polycyclic aromatic compounds (PAHs) are hydrocarbons containing 2 or more benzene rings, are residual contaminants in surface water, and are easily distributed from an aqueous phase to sediments and organic matters because of low water solubility and high octanol-water system distribution coefficient, so that the polycyclic aromatic compounds are ubiquitous in environmental systems such as surface water, estuary, shore ecological environment, soil and the like, the types are up to 100, and 16 PAHs are blacklisted by the U.S. environmental protection agency in 1979 as organic contaminants with priority control. The energy demand of China is continuously increased due to the rapid development of social economy, meanwhile, the energy utilization efficiency is lower, the PAHs discharge amount is continuously increased, the PAHs enter a water body through the ways of waste water discharge, atmospheric sedimentation and the like, but the PAHs are easy to adsorb on suspended particles of the water body and deposit in bottom mud to cause the pollution of sediment, and when the environmental conditions are changed, the PAHs in the sediment can enter the water body to become a secondary pollution source of water body pollution. PAHs can be accumulated and amplified continuously through food chains, so that serious threat is caused to biological population and communities in water environment, including human health, and potential hazard of decay and degradation of an ecosystem is caused finally, and the PAHs have strong physiological and genetic toxicity, strong carcinogenicity and mutagenicity, low natural degradation rate and difficult degradation, and once entering the environment, the PAHs form a permanent threat to ecological environment and human health.
At present, the repair technology of PAHs pollution sediment at home and abroad mainly comprises physical, chemical and biological repair technologies. Compared with physical and chemical sediment repair technologies, biological repair technologies are increasingly favored because of low investment, no secondary pollution and durable treatment effect. According to the division of treatment sites, the method can be divided into two major categories, namely an ectopic repair technology and an in-situ repair technology. At present, an acquired sediment sample polluted by PAHs is mainly analyzed and researched in a laboratory stage by utilizing an ectopic repair technology, sediment on a river, a lake and a river bed is required to be dug out and transported to equipment for treatment, and a treatment site is required to be moved and additionally constructed, so that time, labor and cost are consumed, the ecological of the river bed is destroyed, and the ecological environment is greatly destroyed, so that the ectopic repair technology is mainly stopped in the laboratory stage and is difficult to popularize and apply.
Disclosure of Invention
In order to solve the problem of PAHs pollution in river water system sediment in the prior art, the invention discloses a method for removing polycyclic aromatic hydrocarbon in river water system sediment in situ, which removes PAHs in river water system sediment in situ on the basis of not changing natural ecological environment of river water system in a physical, chemical and biological three-in-one combined mode, improves activity of aquatic organisms and aquatic plants in river, and purifies water system; can be carried under the conditions of no sediment movement, no additional construction of treatment sites and no substantial destruction of natural environment of water sediment, the method realizes reduction and elimination of pollutants in situ, and has simple operation and low running cost.
The technical scheme of the invention is realized as follows:
a method for removing polycyclic aromatic hydrocarbon in river water system sediment in situ is realized by the following steps:
(1) Putting ultrasonic adsorption combined equipment into river water system sediment containing PAHs, and degrading and adsorbing small molecular PAHs in the sediment; ultrasonic waves can enable PAHs in sediment to migrate into a water body, and can have certain degradation effect on the sediment and the PAHs with low molecular weight in the water;
(2) Placing benthonic animals in the area treated in the step (1) to activate the activity of microorganisms in the sediment, so as to promote the degradation and/or absorption of PHAs by the microorganisms and benthonic animals in the sediment;
(3) Planting submerged plant Sargassum armpit and/or shallow water ryegrass in the area treated in the step (2); on the one hand, the aquatic plants can increase dissolved oxygen in water and provide more habitat environments for benthonic animals and aquatic animals, so that the activities of microorganisms and benthonic animals in sediment are promoted, the degradation of PAHs is improved, and on the other hand, the aquatic plants can absorb part of the PAHs in the growth process.
As a preferred embodiment, the ultrasonic adsorption combination device consists of an ultrasonic device acting on the upstream sediment and at least one group of adsorption devices positioned on the surface of the downstream sediment, wherein the adsorption devices are distributed at intervals along the water flow direction.
As a preferred embodiment, the ultrasonic device comprises at least one set of ultrasonic wave plates inserted in the upstream deposit, a steel plate for fixing the ultrasonic wave plates, a power supply, and a power supply connection line.
Preferably, the ultrasonic device is composed of four parallel and equidistantly distributed ultrasonic wave plates, a steel plate welded and fixed with the top surface of the ultrasonic wave plates, triangular prisms welded with the bottom surface of the ultrasonic wave plates, a power supply and a power supply connecting line for connecting the ultrasonic wave plates and the power supply, and in order to enable the ultrasonic wave plates to be better inserted into sediments, one edge of each triangular prism is designed into a tooth-shaped structure, and the tooth-shaped edge is opposite to a surface contacted with the bottom surface of the ultrasonic wave plates.
As a preferred embodiment, the ultrasonic device sonicates the sediment in the flow field at a frequency of 100-200W for 80-150 minutes.
As a preferred implementation mode, the adsorption device consists of two wire meshes and a plurality of adsorption rollers fixed between the two wire meshes, wherein adsorption materials are arranged in the adsorption rollers, and the adsorption rollers are distributed in a staggered manner so as to ensure that the passing water flow is not missed; and pore structures which do not allow the adsorption material to pass through are uniformly distributed on the side wall of the adsorption roller. Preferably, the adsorption material is modified activated carbon.
As a preferred embodiment, the modified activated carbon is obtained by dissolving dodecyl trimethyl ammonium bromide and sodium dodecyl sulfonate into a surfactant solution, adding cylindrical activated carbon, stirring, filtering, drying, and activating at 105 ℃; wherein the mass ratio of the cylindrical active carbon to the cationic surfactant dodecyl trimethyl ammonium bromide to the anionic surfactant dodecyl sodium sulfonate is (4-6) 1:1. In order to increase the adsorption capacity of the activated carbon to PAHs, a cationic surfactant, namely dodecyl trimethyl ammonium bromide and an anionic surfactant, namely sodium dodecyl sulfonate, are added, so that the sediment-water distribution coefficient of the PAHs is reduced in a phase-changing manner, and more PAHs in the sediment migrate into water.
As a preferred embodiment, the upper and lower bottom surfaces of the adsorption drum are respectively provided with a latch for fixing with the wire netting, and the upper and lower bottom surfaces are preferably designed to be of a non-porous structure.
As a preferred embodiment, the benthonic animal in the step (2) is tubificidae, and the activity of microorganisms in sediment is activated in the survival process of the tubificidae, so that the degradation of PAHs is promoted, and in addition, part of PAHs can be absorbed by the tubificidae in the survival process, so that the sediment and the PAHs in water are further reduced.
The frequency, processing time, number of ultrasonic wave plates, surface area of the ultrasonic wave plates, benthonic animal species and amount, amount of foxtail, amount of ryegrass and the like of the ultrasonic wave instrument can be properly adjusted according to the pollution degree of sediment and hydrogeological conditions.
According to the invention, PAHs in river water system sediments and released into water are degraded and removed by means of ultrasonic degradation and addition of aquatic plants and benthonic animals; migrating PAHs in natural water sediments into water in an ultrasonic mode, and removing the PAHs in the water by adsorption; the PAHs in the sediment are removed in situ by a composite method combining a physicochemical method and a biological method, so that the pollution problem of the PAHs in the sediment is solved, and the original ecological environment of the river basin is protected.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic structural view of an ultrasonic adsorption combined device.
Fig. 2 is a schematic structural view of the adsorption device.
Fig. 3 is a schematic view of the structure of the wire mesh on the upper/lower surface of the adsorption apparatus of fig. 2.
Fig. 4 is a schematic structural view of the adsorption drum in the adsorption apparatus of fig. 2.
Fig. 5 is a schematic view of the structure of the upper/lower bottom surface of the adsorption drum of fig. 4.
Fig. 6 is a schematic structural view of the ultrasonic device in fig. 2.
Fig. 7 is a schematic diagram of the structure of the ultrasonic wave plate in fig. 6.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 to 7, firstly, ultrasonic adsorption combination equipment is placed in a basin a sediment containing PAHs, wherein the ultrasonic adsorption combination equipment consists of ultrasonic devices acting on the sediment at the upstream and adsorption devices respectively positioned on the surface of the sediment at the downstream 10 m, and the number of groups of the adsorption devices is twice that of the ultrasonic devices; the ultrasonic device consists of four ultrasonic wave plates which are parallel and equidistantly distributed, a steel plate welded and fixed with the top surface of the ultrasonic wave plate, a triangular prism welded with the bottom surface of the ultrasonic wave plate, a power supply and a power supply connecting line for connecting the ultrasonic wave plate and the power supply, wherein one edge of the triangular prism is of a tooth-shaped structure and is opposite to a surface contacted with the bottom surface of the ultrasonic wave plate, and each ultrasonic wave plate is used for carrying out ultrasonic treatment on sediment in a convection domain at a frequency of 150W for 120min; the adsorption device (100 cm multiplied by 50 cm) consists of two wire nets and a plurality of adsorption rollers (the diameter is 10cm and the height is 50 cm) fixed between the two wire nets, the adsorption rollers are distributed in a staggered manner so as to ensure that the passing water flow is not missed, modified activated carbon is filled in the adsorption rollers, and pore structures slightly smaller than the particle size of the modified activated carbon are uniformly distributed on the side wall of the adsorption rollers so as to prevent the leakage of the pore structures passing through the modified activated carbon into a water body; the upper bottom surface and the lower bottom surface of the adsorption roller are of non-porous structures, and are respectively provided with a lock catch non-porous structure for fixing with the wire netting. Secondly, the benthonic animals are bred in the treated area to be tubificidae so as to stimulate the activity of microorganisms in the sediment, thereby promoting the degradation of PAHs, and in addition, the tubificidae can absorb part of the PAHs in the survival process, so that the sediment and the PAHs in water are further reduced; then, planting submerged plants of the foxtail algae and ryegrass in shallow water in the area where the tubificidae is bred; on the one hand, the aquatic plants can increase dissolved oxygen in water and provide more habitat environments for benthonic animals and aquatic animals, so that the activities of microorganisms and benthonic animals in sediment are promoted, the degradation of PAHs is improved, and on the other hand, the aquatic plants can absorb part of the PAHs in the growth process.
The modified activated carbon is obtained by dissolving dodecyl trimethyl ammonium bromide and sodium dodecyl sulfonate into a surfactant solution, adding cylindrical activated carbon, stirring for 60min, filtering, drying, and activating at 105 ℃; wherein the mass ratio of the cylindrical active carbon to the cationic surfactant dodecyl trimethyl ammonium bromide to the anionic surfactant dodecyl sodium sulfonate is (4-6) 1:1, and the concentration of the dodecyl trimethyl ammonium bromide and the concentration of the dodecyl sodium sulfonate in the surfactant solution are 5g/L.
Wherein the A-domain width is 5m, the thickness of the sediment layer is 1m, 16 PAHs (naphthalene, acenaphthylene, fluorene, phenanthrene, anthracene, fluoranthene, pyrene, benzo (a) anthracene, chrysene, benzo (b) fluoranthene, benzo (k) fluoranthene, benzo (a) pyrene, indeno [1,2, 3-cd) in the sediment]Pyrene, dibenzo [ a, h]Anthracene, benzo [ g, h, i]Perylene) in an amount of 21.2 mg.kg -1 2000 earthworms/m are put in 2 The input amount of the submerged plant of the foxtail is 50 plants/m 2 50 plants/m of ryegrass are planted 2 。
In order to better illustrate the effect of the technical scheme of the invention, B, C which is indistinguishable from the width of the A river basin and the state of the sediment layer and the D river basin are selected to be used as comparison experiments, the B river basin is used as blank contrast, and sediment is not treated; only two factors of ultrasonic degradation and adsorption are treated in the C basin; only tubificidae and ryegrass are planted in the D river basin; the effects of the A-D basins after half a year of corresponding treatment are shown in Table 1:
table 1: effects of A-D basin after half a year of corresponding treatment
。
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (5)
1. The method for removing the polycyclic aromatic hydrocarbon in the river water system sediment in situ is characterized by comprising the following steps:
(1) Putting an ultrasonic adsorption combined device into a river water system sediment containing PAHs, and degrading and adsorbing small molecular PAHs in the sediment;
(2) Stocking benthonic animals in the area treated in step (1) to activate the activity of microorganisms in the sediment;
(3) Planting submerged plant Sargassum armpit and/or shallow water ryegrass in the area treated in the step (2);
the ultrasonic adsorption combined device consists of an ultrasonic device acting on upstream sediment and at least one group of adsorption devices positioned on the surface of downstream sediment, and the adsorption devices are distributed at intervals along the water flow direction; the ultrasonic device comprises at least one group of ultrasonic wave plates inserted into the upstream sediment, a steel plate for fixing the ultrasonic wave plates, a power supply and a power supply connecting line;
the adsorption device consists of two wire meshes and a plurality of adsorption rollers fixed between the two wire meshes, wherein the adsorption rollers are distributed in a staggered manner, adsorption materials are arranged in the adsorption rollers, and hole structures which do not allow the adsorption materials to pass through are uniformly distributed on the side walls of the adsorption rollers; the adsorption material is modified active carbon, and the modified active carbon is obtained by dissolving dodecyl trimethyl ammonium bromide and sodium dodecyl sulfonate into a surfactant solution, adding cylindrical active carbon, stirring, filtering, drying and activating at 105 ℃; wherein the mass ratio of the cylindrical active carbon to the dodecyl trimethyl ammonium bromide to the dodecyl sodium sulfonate is (4-6): 1:1.
2. The method of claim 1, wherein: the ultrasonic device consists of four ultrasonic wave plates which are parallel and equidistantly distributed, a steel plate welded and fixed with the top surface of the ultrasonic wave plate, a triangular prism welded with the bottom surface of the ultrasonic wave plate, a power supply and a power supply connecting line for communicating the ultrasonic wave plate with the power supply, wherein one edge of the triangular prism is of a tooth-shaped structure and is opposite to a surface contacted with the bottom surface of the ultrasonic wave plate.
3. The method of claim 2, wherein: the ultrasonic device is used for carrying out ultrasonic treatment on sediment in river water system for 80-150min at the frequency of 100-200W.
4. The method of claim 1, wherein: the upper bottom surface and the lower bottom surface of the adsorption roller are respectively provided with a lock catch for fixing the adsorption roller with the wire netting.
5. The method of claim 1, wherein: the benthonic animals in the step (2) are tubificidae.
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| CN114133020A (en) * | 2021-11-15 | 2022-03-04 | 同济大学 | Method and system for in-situ remediation of river sediment polycyclic aromatic hydrocarbon pollution by ozone micro-nano bubbles and ultrasonic waves |
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