CN1788866A - Method for electrically and biologically rehabilitating soil adopting electrode matrix - Google Patents
Method for electrically and biologically rehabilitating soil adopting electrode matrix Download PDFInfo
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- CN1788866A CN1788866A CN 200510130710 CN200510130710A CN1788866A CN 1788866 A CN1788866 A CN 1788866A CN 200510130710 CN200510130710 CN 200510130710 CN 200510130710 A CN200510130710 A CN 200510130710A CN 1788866 A CN1788866 A CN 1788866A
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Abstract
The present invention belongs to the field of environment protecting technology, and is especially soil repairing electric and biological electrode matrix method. The present invention features that one dimensional or two dimensional electrode matrix is adopted to disperse foreign matter into soil in monoway running mode and to strengthen the mass transfer between the pollutant and the degrading bacteria and complete in-situ reinforcement in bi-directional mode. The present invention can enrich the pollutant in soil to specific treating area, disperse the nutritive matter and microbe injected in fixed point to soil fast, reinforce the mass transfer between the pollutant and the degrading bacteria and raise the biological repair efficiency.
Description
Technical field
The invention belongs to environmental protection technical field, particularly the technical field that adopts electrode matrix that soil is repaired.
Background technology
Compound organic contamination is one of problem the most serious in the soil pollution.There are 1300-1600 ten thousand hm in the whole nation
2The arable land is subjected to the pollution of agricultural chemicals.The oilfield chemical district is owing to be subjected to organic pollutions such as aromatics, alkanes, olefines and phenol, acid, aldehyde, ketone, ester, and the pollutant levels of soil are tens of times to thousands of times of background value often.The density of population of China is big, to the dependence in soil considerably beyond other countries, thereby the reparation task arduousness of polluted soil.
The organic polluted soil bioremediation technology comprises the heterotopic biological processing
(as biological mud reactor etc.) and biology in situ reparation (microorganism or the reparation of plant original position etc.).Compare with the heterotopic biological recovery technique with traditional physical chemistry technology, soil biology in situ recovery technique has that processing cost is low, non-secondary pollution and do not destroy advantages such as natural environment, but often repair slowlyer in the open air under the condition, this mainly is to be subjected to due to the restriction of environmental condition.This comprising: usually lack the required nutrients of biological restoration, electron acceptor, metabolism matrix and microorganism altogether in (1) soil.(2) in the low soil body of pollutant levels, microorganism utilizes the ability of pollutant to be subjected to inhibition.(3) the low mass transfer speed that in soil media, causes owing to materialization effects such as absorption, obstructs.
Electrokinetic technique is a kind of emerging soil remediation technology.Its basic principle is that electrode is inserted the polluted soil zone, apply faint direct current and form electric field, the various electrokinesises such as electric osmose, electromigration and the electrophoresis etc. that utilize electric field to produce, drive soil pollutant along the direction of an electric field directional migration, thereby enriching pollutants to electrode district, is focused on then or separates.At present, the application of electrokinetic technique in the organic polluted soil reparation mainly concentrates on extraction stain thing from soil.The organic pollution of report comprises phenol, toluene, caproic acid, benzene, p-nitrophenols, trichloro-ethylene (TCE), petroleum substance (BTEX), hexachlorobutadiene, hexachloro-benzene and acetone etc.
Biological restoration and electrokinetic technique are combined, can utilize electrokinetic technique mass transfer advantage rapidly, under the prerequisite of not destroying soil environment, accelerate repair process in the soil.The main at present unidirectional operation pattern that adopts of this technology, can be with enriching pollutants to specific biological treatment zone, electric power can also drive various additives such as active microorganism, nutrients and electron acceptor etc., and it is delivered to the contaminated area to replenish the required allogenic material of biological restoration.Through our research, adopt the switching polarity of electrode to carry out way traffic, organic matter and microorganism move back and forth under electrodynamic action in the soil body, form local the mixing, can improve mass transfer rate and remediation efficiency between microorganism and organic matter.Considerably less to the research of electrically and biologically reparation both at home and abroad at present, the research that direct in-situ is strengthened does not appear in the newspapers as yet.
The acidity migration band that electrode reaction produces usually causes that electrodialysis stream weakens even oppositely, increases the operating voltage and the energy consumption of system simultaneously.Extreme pH also may kill the microorganism of not acidproof/alkali in a large number around the electrode, influences the effect of biological restoration.In experiment, need to take corresponding measure to reduce the negative effect of electrode reaction.Measure at present commonly used comprises and cushioning liquid district, circular electrolyte is set and selective membrane etc. is set that these measures also are not suitable for large-scale open-air the reparation around electrode.During way traffic, H+ that electrode reaction produces and OH-be constantly neutralization near electrode, soil body pH fluctuation can be maintained one more among a small circle in.
Can adopt tabular in the electronic reparation respectively and all even inhomogeneous field of columnar electrode generation.The uniform electric field active area is big, extraction stain thing from soil promptly, and this type of electric field is adopted in existing research mostly.Yet under the uniform electric field, violent water translocation and electrode reaction cause soil solidification and acidifying easily, and this is very disadvantageous to biological restoration.Compare with it, inhomogeneous field can keep the stability of soil property better, will the disturbance of soil environment be minimized.In addition, ripe at present drilling technique also makes the columnar electrode field construction be more prone to.In a word, compare with uniform electric field, inhomogeneous field has remarkable advantages in the electrically and biologically reparation.In order to carry out the pollution in wide area soil remediation, need be in the soil body installing electrodes matrix.The matrix that columnar electrode forms has peacekeeping two dimension two class configurations.When adopting the one dimension configuration, electrode forms electrode matrix (Fig. 1) by rows.When adopting two dimensional configurations, electrode is formed centrally regular polygon in a certain, and a plurality of then identical polygons are expanded and formed electrode matrix (Fig. 2) by common electrode.One peacekeeping two-dimensional electrode matrix unit internal electric field is linear and radial distribution respectively.At present, the columnar electrode matrix only is used for from soil extraction stain thing, does not relate to biology in situ as yet and repairs the field.
Summary of the invention
The objective of the invention is to, deficiency at the prior art existence, proposed a kind of electrode matrix that adopts soil has been carried out the method that biology in situ is repaired, this method adopts electrokinesis to carry allogenic material to improve the biologically active of reaction zone in soil, or the mass transfer between increase pollutant and the degradation bacteria, carry out direct home position strengthening, improve the efficient that biology in situ is repaired.
The invention is characterized in, in organic polluted soil, squeeze into columnar electrode and form one dimension or two-dimensional electrode matrix, adopt the unidirectional operation mode, in soil, disperse allogenic material.
The different in nature electrode spacing that described electrode matrix is adjacent is 0.2m-1.0m.
Adopt the another kind of method of electrode matrix electrically and biologically rehabilitating soil, it is characterized in that, in organic polluted soil, squeeze into columnar electrode and form one dimension or two-dimensional electrode matrix, adopt the way traffic mode, strengthen the mass transfer between pollutant and the degradation bacteria, carry out direct home position strengthening.
The different in nature electrode spacing that described electrode matrix is adjacent is 0.2m-1.0m, and the polarity switching interval of described way traffic is 3-12 hour.
Experiment showed, and adopt the present invention the pollutant in the soil effectively can be enriched to specific processing region; Nutriment and the microorganism that fixed point is injected can be distributed to the soil body apace; Can strengthen the mass transport process of pollutant and degradation bacteria in the soil body, improve biological restoration efficient.
Description of drawings
Fig. 1 is the one-dimensional electrodes configuration picture;
Fig. 2 is the two-dimensional electrode configuration picture, and Fig. 2 (a) is a square matrices, and Fig. 2 (b) is the regular hexagon matrix;
Fig. 3 is the migration of one dimension inhomogeneous field parachlorphenol;
Fig. 4 is the migration of one dimension inhomogeneous field to nitrate anion;
Fig. 5 is the migration of one dimension inhomogeneous field Pyrogentisinic Acid degradation bacteria;
Fig. 6 is that the one dimension electrically and biologically is repaired the phenol contaminated soil;
Fig. 7 is that two-dimentional electrically and biologically is repaired the chlorophenol contaminated soil.
The specific embodiment
The present invention proposes the method with columnar electrode matrix electrically and biologically renovation of organic pollution soil, may further comprise the steps:
(1) electrode is arranged: squeeze into columnar electrode at contaminated site, adopt common one dimension/two dimensional configurations to form electrode matrix (Fig. 1,2).Opposite sex electrode spacing is set in the scope of 0.2m-1.0m, selects the number of suitable post loading electrode according to repairing the area size.
(2) operation: the negative or positive electrode of all electrodes in the matrix being received power supply.The one dimension configuration keeps adjacent lines polarity opposite down, keeps the electrode unit central electrode opposite with surround electrode polarity under the two dimensional configurations.Fixed electrode polarity is carried out unidirectional operation can the enrichment pollutant or apply allogenic material, switches polarity of electrode and carries out way traffic and can directly strengthen reparation, and the polarity switching interval is selected in 3-12 hour the scope.
Power supply of the present invention is generally industrial power, also can attempt sun-generated electric power.The length of columnar electrode and electronic repair time are according to the degree of depth of polluting and degree decision.The electrode of selecting for use is the high-purity carbon electrode or the metal electrode of inertia.
Method of the present invention has following effect:
(1) electrode matrix that adopts of the present invention chlorophenol in the enrichment soil effectively.In the soil body 2, the 4-two chlorophenols speed anode with about 1.0cm/ days under the voltage gradient of 1.0V/cm is moved.
(2) electrode matrix of the present invention's employing can replenish ionic nutriment and the inoculating microbe that biological restoration needs apace in soil.Nitrate anion (NO
3 -) under the 1.0V/cm voltage gradient migration velocity up to 22.0cm/d, the speed of injecting much larger than waterpower.The phenol efficient degrading bacteria that injects can keep active well in the process of fast transferring.
(3) electric field that forms of electrode matrix can increase the touch opportunity of microorganism and polluter in the soil, raising remediation efficiency effectively.In the lab scale of laboratory, phenol and 2, the removal efficient of 4-two chlorophenols has been enhanced 6.8 and 3.3 times respectively.
Introduce embodiments of the invention below:
Embodiment 1: the enrichment of chlorophenol in the soil
In the sandy loam layer, moisture content is 17-19%.2, the initial concentration of 4-two chlorophenols is about the 83mg/Kg dry ground, adopts the unidirectional inhomogeneous field that applies of one-dimensional electrodes configuration, and voltage gradient is 1.0V/cm, and electrode spacing is 20cm.After experiment finished, sampling and measuring 2 on the diverse location of electrode pair line, the concentration of 4-two chlorophenols.Chlorophenol in the soil sample (extraction rate reached 94.8%) after three extractions of second cyanogen send high performance liquid chromatograph to detect, and mobile phase composition is a methyl alcohol: the 5% glacial acetic acid aqueous solution=67: 33, the detection wavelength is 284nm.
Fig. 3 shows that test run is in the time of 1 day, and apart from 2 of negative electrode 1cm, 4-two chlorophenol content have reduced to zero, and increase by 19% apart from the content of negative electrode 4cm.When moving 3,6 and 10 days, 2, the maximum level of 4-two chlorophenols is respectively at distance negative electrode 4,7 and 10cm.As seen, 2 in the whole process in the sandy loam, 4-two chlorophenol anode have been carried out enrichment.Follow-up experiment showed, through after the electronic enrichment adds Black Liquor with Efficient Bacteria in the anode region fixed point and can remove chlorophenol in the soil body effectively.
Embodiment 2: the injection of inorganic nutrients ion nitrate anion
In the sandy loam layer, moisture content is 17-19%, adds NO in fixedly quartz sand zone (C-r district)
3 -Ion, in the one-dimensional electrodes configuration, the unidirectional inhomogeneous field 1.0V/cm that applies, electrode spacing is 100cm, experiment operation 100 hours.With the reaction system that do not apply voltage in contrast.Every sampling in 10 hours once, measure the NO of diverse location with ion chromatograph in the experimentation
3 -Ion concentration.
Fig. 4 shows in 100 hours unidirectional operation process, NO
3 -The continuous anode migration of ion, and be diffused into whole soil region.After 80 hours, the NO of A, last four diverse locations in B line district
3 -Ion concentration all reaches or near 1.4mg/Kg soil, and sample point does not detect NO in the control experiment
3 -Ion, this has confirmed to adopt this configuration to disperse NO in soil
3 -Be feasible.By calculating, can draw NO
3 -The migration rate of anode was up to 22.0cm/ days.
Embodiment 3: the injection of phenol efficient degrading bacteria
In the sandy loam layer of sterilization, moisture content is 17-19%.(C-m district) adds the bacterial suspension of high concentration in the quartz sand zone.In the one-dimensional electrodes configuration, the unidirectional inhomogeneous field 1.0V/cm that applies, electrode spacing is 20cm, experiment operation 32 hours.With the reaction system that do not apply voltage in contrast.Live in the sampling and measuring soil sample in the experimentation bacterial population and dead bacterial population.Soil sample is counting after the sodium pyrophosphate vibration is extracted, and the bacterial population of living adopts plate technique method (CFU), and dead bacterial population adopts the Baclight LIVE/DEAD probe dyeing back of MolecularProbes company to count rhodobacterium with fluorescence microscope at 460-490nm.
Through 20 and 28 hours operation, the bacterial concentration at a0 and c0 place reached maximum respectively, but the bacterial concentration of the two differs greatly (Fig. 5).This show the bacterium main body under electric field action with the migration of 6.6cm/ days speed anode.The mensuration that experiment finishes the dead bacterium ratio in back shows that extra electric field is less to the bacterial activity influence in most of zone (except the cathodic region).
Embodiment 4: the reparation of phenol contaminated soil
In the sandy loam layer, moisture content is 17-19%, is organic pollution materials with phenol.The initial concentration of pollutant is the 180mg/Kg dry ground, and Initial microorganisms is the phenol Black Liquor with Efficient Bacteria of artificial screening, and concentration is 1.5 * 10
9Individual/the g dry ground.System adopts the electrode pair in the one dimension configuration.Apply steady voltage on electrode, voltage gradient is 1.0V/cm, and electrode spacing is 20cm.Regular switch polarity, switching interval was respectively 3,6 and 12 hours.Continuously operation 10 days of system, with the reaction system that do not apply voltage in contrast.After experiment finishes, in the concentration of the diverse location place of reactor sampling and measuring phenol.Remaining phenol in the soil sample (extraction rate reached 91.6%) after three extractions of carrene send high performance liquid chromatograph to detect, and mobile phase composition is a methyl alcohol: the 2% glacial acetic acid aqueous solution=60: 40, the detection wavelength is 275nm.
Operation through 10 days, the average degradation efficiency of phenol is the degradation rate (Fig. 6) that 67.5% (switching interval is 3 hours) is higher than control experiment 8.6% far away in the reactor, shows that the pattern of way traffic in the one-dimensional electrodes configuration can strengthen the degraded of phenol in the soil body widely.Contrasting different switching intervals can find, it is fast more that polarity is switched, and repairs evenly more, but the while energy consumption is also high more.Thereby, select suitable two-way interval extremely important according to physical condition.
Embodiment 5: the reparation of chlorophenol contaminated soil
In the sandy loam layer, moisture content is 20-22%, and with 2,4-two chlorophenols are organic pollution materials.The initial concentration of pollutant is about the 95mg/Kg dry ground, and Initial microorganisms is the chlorophenol Black Liquor with Efficient Bacteria of artificial screening, and concentration is 2.3 * 10
8Individual/the g dry ground.System adopts 7 chimney rock electrode inks to be arranged in the regular hexagon configuration according to Fig. 6.Apply voltage on electrode simultaneously, voltage gradient is 1.0V/cm, and electrode spacing is 20cm, and the polarity switching interval is 6 hours.Move 15 days.With the reaction system that do not apply voltage in contrast.After experiment finishes, in the diverse location sampling and measuring 2 of reactor, the concentration of 4-two chlorophenols.
Through 15 days operation, the average degradation efficiency of the inside and outside circle sample point of reactor chlorophenol was respectively 85.5% and 61.4%, and total mean value is 73.2% (Fig. 7).And the average degradation efficiency of chlorophenol is 17.1% in the control experiment.Therefore adopt the two-dimensional electrode matrix unit to apply that the degradation efficiency of chlorophenol has improved more than three times behind the inhomogeneous field.As calculated, the every increase of the degradation amount of chlorophenol 1.0g in the soil body needs consumed power to be about 0.46kWh in the experiment.
Embodiment 6: the reparation of phenanthrene-polluted soil
In the sandy loam layer, moisture content is 17-19%, is organic pollution materials with the phenanthrene.The initial concentration of pollutant is about the 180mg/Kg dry ground, and edaphon is the phenol Black Liquor with Efficient Bacteria of artificial screening, and concentration is about 2 * 10
9Individual/the g dry ground.System adopts the electrode pair of one dimension configuration.Electrode spacing is 50cm in the reactor, applies voltage on electrode, and voltage gradient is 1.0V/cm, and way traffic, polarity switching interval are 3 hours, move 15 days.With the reaction system that do not apply voltage in contrast.After experiment finishes, in the concentration of the diverse location sampling and measuring phenanthrene of reactor.
Through 10 days operation, average degradation efficiency luxuriant and rich with fragrance in the reactor was about 20%.And the average degradation efficiency of control experiment China and Philippines only is 3.0%.Therefore adopt the one-dimensional electrodes matrix unit to apply inhomogeneous field, the degradation efficiency of soil China and Philippines has improved 5-7 doubly.As calculated, institute's consumed power is about 60kWh/m in the experiment
3
Claims (5)
1, adopts the method for electrode matrix electrically and biologically rehabilitating soil, it is characterized in that, in organic polluted soil, squeeze into columnar electrode and form one dimension or two-dimensional electrode matrix, adopt the unidirectional operation mode, in soil, disperse allogenic material.
2, the method for employing electrode matrix electrically and biologically rehabilitating soil as claimed in claim 1 is characterized in that, the different in nature electrode spacing that described electrode matrix is adjacent is 0.2m-1.0m.
3, adopt the method for electrode matrix electrically and biologically rehabilitating soil, it is characterized in that, in organic polluted soil, squeeze into columnar electrode and form one dimension or two-dimensional electrode matrix, adopt the way traffic mode, strengthen the mass transfer between pollutant and the degradation bacteria, carry out direct home position strengthening.
4, the method for employing electrode matrix electrically and biologically rehabilitating soil as claimed in claim 3 is characterized in that, the different in nature electrode spacing that described electrode matrix is adjacent is 0.2m-1.0m.
5, the method for employing electrode matrix electrically and biologically rehabilitating soil as claimed in claim 3 is characterized in that, the polarity switching interval of described way traffic is 3-12 hour.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010081291A1 (en) * | 2008-12-30 | 2010-07-22 | 中国科学院沈阳应用生态研究所 | System and method for remediation of organic contaminated soil |
| CN102294350B (en) * | 2008-12-30 | 2013-04-17 | 中国科学院沈阳应用生态研究所 | System and method for resorting organic polluted soil |
| CN103331296A (en) * | 2013-06-09 | 2013-10-02 | 江苏大学 | Electrochemical repair electrode for contaminated soil |
| CN104741367A (en) * | 2013-12-30 | 2015-07-01 | 北京有色金属研究总院 | Method for removing arsenic in soil by combining microorganisms with electric repairing |
| CN106623397A (en) * | 2016-07-11 | 2017-05-10 | 国家地质实验测试中心 | Electrodynamics-permeation reaction grid device suitable for outdoor field repair of composite polluted soil and technological process |
| CN107185955A (en) * | 2017-05-12 | 2017-09-22 | 清华大学 | Contaminated soil original position eddy current type thermal desorption system |
| CN107570532A (en) * | 2017-10-17 | 2018-01-12 | 陆隽鹤 | A kind of method of electronic diffusion electrical heating coupling rehabilitating soil organic contamination |
| CN109759437A (en) * | 2019-01-21 | 2019-05-17 | 胡鹏程 | A kind of chemical pollution soil remediation construction method and constructing device |
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2005
- 2005-12-23 CN CNB2005101307107A patent/CN100537064C/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010081291A1 (en) * | 2008-12-30 | 2010-07-22 | 中国科学院沈阳应用生态研究所 | System and method for remediation of organic contaminated soil |
| CN102294350B (en) * | 2008-12-30 | 2013-04-17 | 中国科学院沈阳应用生态研究所 | System and method for resorting organic polluted soil |
| CN103331296A (en) * | 2013-06-09 | 2013-10-02 | 江苏大学 | Electrochemical repair electrode for contaminated soil |
| CN103331296B (en) * | 2013-06-09 | 2015-05-27 | 江苏大学 | Electrochemical repair electrode for contaminated soil |
| CN104741367A (en) * | 2013-12-30 | 2015-07-01 | 北京有色金属研究总院 | Method for removing arsenic in soil by combining microorganisms with electric repairing |
| CN104741367B (en) * | 2013-12-30 | 2017-05-17 | 北京有色金属研究总院 | Method for removing arsenic in soil by combining microorganisms with electric repairing |
| CN106623397A (en) * | 2016-07-11 | 2017-05-10 | 国家地质实验测试中心 | Electrodynamics-permeation reaction grid device suitable for outdoor field repair of composite polluted soil and technological process |
| CN107185955A (en) * | 2017-05-12 | 2017-09-22 | 清华大学 | Contaminated soil original position eddy current type thermal desorption system |
| CN107570532A (en) * | 2017-10-17 | 2018-01-12 | 陆隽鹤 | A kind of method of electronic diffusion electrical heating coupling rehabilitating soil organic contamination |
| CN109759437A (en) * | 2019-01-21 | 2019-05-17 | 胡鹏程 | A kind of chemical pollution soil remediation construction method and constructing device |
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Application publication date: 20060621 Assignee: SHANTOU HONGDONG ENVIRONMENT TREATMENT CO.,LTD. Assignor: Tsinghua University Contract record no.: 2018990000322 Denomination of invention: Method for electrically and biologically rehabilitating soil adopting electrode matrix Granted publication date: 20090909 License type: Exclusive License Record date: 20181130 |
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