CN102049411A - Novel electric nutritive salt injection process - Google Patents
Novel electric nutritive salt injection process Download PDFInfo
- Publication number
- CN102049411A CN102049411A CN2009100711604A CN200910071160A CN102049411A CN 102049411 A CN102049411 A CN 102049411A CN 2009100711604 A CN2009100711604 A CN 2009100711604A CN 200910071160 A CN200910071160 A CN 200910071160A CN 102049411 A CN102049411 A CN 102049411A
- Authority
- CN
- China
- Prior art keywords
- nutritive salt
- soil
- electrolyte
- electrode
- electric
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention discloses a novel electric nutritive salt injection process, which solves the problem of low remediation efficiency caused by insufficient and nonuniform nutritive salt in an in-situ bioremediation organic pollutant polluted site. In the process, electrode switching and two-electrode electrolyte mixed cycle are jointly applied to electrokinetic remediation; when voltage gradient is 1V/cm and electrolyte is nutritive salt solution which comprises 2g/L NH4NO3 and KH2PO4 and has the pH value of 7.3, an electric injection test is performed in an operating mode of periodically changing the direction of an electric field, wherein electrode switching time is 12 hours, and the flow rate of circulating electrolyte is 800ml/h; and test results prove that: the novel electric nutritive salt injection process can well control the pH change of soil in an electric device and make the nutritive salt more uniformly distributed, solves the problems that the pH of the soil is easy to change in the electrokinetic remediation process, the in-situ bioremediation organic pollutant polluted site has insufficient and nonuniform nutritive salt, and the like, provides advantages for in-situ bioremediation organic pollutant polluted soil, and can effectively improve bioremediation efficiency.
Description
Technical field
The invention belongs to environmental protection technical field, be specifically related to adopt electric repairing technique organic material contaminated soil to be carried out the technical field of biological restoration.
Technical background
Soil be the mankind depend on for existence, develop basic, also be the important component part of human ecological environment.Soil pollution is broadly divided into: polytypes such as heavy metal pollution, agricultural chemicals and organic matter pollution, radioactive pollution, pathogen contamination.Wherein, the organic contamination of soil has become the focus of paying close attention in the world as the major pollutants that influence soil environment, poisonous, harmful organic compound is constantly accumulation in environment, down might be to the consequence of bringing on a disaster property of whole ecological system to certain hour or certain condition.
Compare with traditional physical chemistry repairing polluted soil method, the microorganism recovery technique is owing to have environmental friendliness, and cost is low, and can to make the organic pollution mineralising be water and carbon dioxide, does not produce advantages such as secondary pollution, enjoys the favor of academia always.Microbial degradation has six fundamentals: the energy, carbon source, nutriment, electron acceptor, suitable microorganism and adapt circumstance condition.At the scene in the microorganism repair process, because these key elements can not be effectively satisfied, cause under some occasion, later stage of recovery project particularly, the contaminant degradation inefficiency, so a critical limitation factor of restriction micro-organisms field repair efficient can not provide optimum condition by active microorganism exactly, wherein main is to provide enough nutriments to microorganism, therefore, nutriment evenly is provided is a important step in the biological restoration of organic contamination site to repairing the site.Traditional introducing method is by the underground water of the conversion zone of flowing through with the pump extracting, thereby make nutriment under the hydraulic gradient effect, enter conversion zone, there are some problems in this method, at first expense is higher, and secondly the hydraulic action deficiency may cause the somewhere to be rich in nutriment, and makes the microorganism raised growth, form biofouling, and biofouling can block stream and reduce conductivity, thereby is unfavorable for the operation of system, and being positioned at other regional pollutants can not effectively be degraded.Therefore, how nutriment is introduced uniformly conversion zone and is become one of main bottleneck that the biology in situ of success repairs.
Electronic reparation (electrokinetic remediation) is the novel based technique for in-situ remediation that grew up in nearly 10 years, its advantage is: the reparation that is specially adapted to hypotonicity soil (because the hydraulic conductivity problem, the application of other conventional art is restricted); Compared with other conventional repair techniques cost to lack many; Repair time is short; Less to soil property and ecological disruption, be called as green recovery technique.Therefore, this method just causes extensive concern once proposition, is studied exploitation as the recovery technique of heavy metal and organic pollution contaminated soil in the laboratory, demonstrates good prospects for application, becomes important emerging technology of soil remediation.Electronic reparation is applied in the process of biology in situ reparation, compares with traditional introducing method and can not only reduce rehabilitation expense, and can also avoid being created in the problems such as forming biofouling and reduction conductivity in the nutriment process of introducing.But also have some problems in electronic repair process: acute variation easily takes place in the pH of soil in electronic repair process, forms acid migration band and alkalescence migration band, influences activation of microorganism; The underground pollution district often lacks nutrients such as microbial metabolism action need nitrogen, phosphorus, and electrokinetic technique can be carried nutriment for biological restoration, but its delivery profile in the soil pollution district is also inhomogeneous, influences the effect of biological restoration.
2009, Sun Hongwen etc. first electrode are switched and two utmost point electrolyte mixing circulation are united utilization in electronic reparation, substantially solved in the electronic repair process that soil pH takes place easily that soda acid changes and biology in situ renovation of organic pollution thing pollued field nutritive salt shortage and problem such as inhomogeneous, for biology in situ renovation of organic pollution thing contaminated soil provides advantage, the research that has advanced electronic reparation and biology in situ to repair.
Summary of the invention
The objective of the invention is to solve that biology in situ renovation of organic pollution thing pollued field nutritive salt lacks and inhomogeneous and cause the problem that remediation efficiency is low, the operational mode and the parameter of the electronic injection nutritive salt of a kind of new application technology are provided, for biology in situ renovation of organic pollution thing contaminated soil provides advantage, effectively improved the efficient of biological restoration.
Technology of the present invention mainly contains the following aspects:
(1) design and making meet the electric device of the object of the invention;
(2) test after device installs, according to result of the test, when the voltage gradient of testing is 1V/cm, electrolyte is the natural neutral pH (7.3) of test water running water, when the flow velocity during circular electrolyte is 800ml/h, can better controlled in the soil pH value between 7.0～7.8, solved substantially that acute variation easily takes place pH in electronic repair process, form the problem that acid migration band and alkalescence migration are with;
(3) electronic injection nutritive salt, the distribution situation of nutritive salt in the soil in the mensuration electric device, determining electrode switching Best Times according to the changes in distribution of nutritive salt is 12h.
(4) will test parameters such as the electrode switching time determined and cyclic electrolysis flow velocity and be applied to and carry out electronic injection nutritive salt test on the electric device, the parameter of test is that voltage gradient is 1V/cm, and electrolyte is that nutrient salt solution (contains 2g/LNH
4NO
3, KH
2P0
4The pH value is 7.3), the flow velocity of circular electrolyte is 800ml/h, electrode switching time is 12h, the result of test shows that having can solve in the electronic reparation pH with this understanding easily changes and inject nutritive salt distribution problem of non-uniform, can effectively improve the efficient of biological restoration.
Description of drawings
Fig. 1 is electric device operation schematic diagram;
Fig. 2 is ammonium radical ion migration distribution map;
Fig. 3 is nitrate anion migration distribution map;
Fig. 4 changes schematic diagram for the pH value.
The specific embodiment:
For the present invention there being clear and definite understanding.Now the invention will be further described in conjunction with the embodiments.
The first step: design and make electric device voluntarily
With reference to correlative study both at home and abroad, according to the requirement of experiment concrete in the invention process and the conclusion of preliminary experiment, the required electric device of contrived experiment voluntarily, and carry out processing and manufacturing.
Second step: the flow velocity of determining circular electrolyte
The electric device that installation is made is also tested, and the voltage gradient of test is 1V/cm, and electrolyte is running water, and its pH is 7.3, regulates the rotating speed of circulating pump, measures the pH conversion of soil in the electric device.Result of the test shows, when the flow velocity of circular electrolyte is 0ml/h, i.e. and circulation time not, the pH value of soil sample changes violently in the electric device, behind the test run 2d, drops to below 3 near the soil sample pH value of anode, and the soil sample pH value of close negative electrode is elevated to more than 10; And when the flow velocity of circular electrolyte was 800ml/h, behind the operation 2d, the soil pH value in but can the better controlled electric device was between 7.0～7.8.
The 3rd step: determine the time interval that electrode switches
Adopt the unidirectional electrode method of operation, the voltage gradient of test is 1V/cm, and electrolyte is that nutrient salt solution (contains 2g/LNH
4NO
3, KH
2PO
4, the pH value is 7.3), the flow velocity of circular electrolyte is 800ml/h, is taken in the electric device anode to equally distributed 5 soil samples of negative electrode, measures the distribution in device soil of ammonium root and nitrate anion, test run 48h, every 6h get time sample.Find according to result of the test, behind test run 12h, the ammonium radical ion has been crossed the soil centre position from anode to cathodic migration, and nitrate ion moves the distance anode 1/5 of having moved from the negative electrode anode, and the time of selecting electrode to switch according to the migration velocity and the characteristics of nutritive salt is 12h.
The 4th step: electronic injection nutritive salt test
This electric injects nutritive salt technology and has solved that the soda acid conversion easily takes place electronic repair process soil pH and electronic injection nutriment exists nutriment in problems such as soil skewness, specifically tests as follows:
The periodically method of operation of conversion direction of an electric field is adopted in test, and electrode switching time is 12h, and voltage gradient is 1V/cm, and electrolyte is that nutrient salt solution (contains 2g/LNH
4NO
3, KH
2PO
4, the pH value is 7.3), the flow velocity of circular electrolyte is 800ml/h, is taken in the electric device anode to equally distributed 5 soil samples of negative electrode, measure ammonium root and nitrate anion in device soil distribution and soil sample in the conversion of pH, test run 48h, every 6h get time sample.
43.4,58.8,40.9,69.0,84.4mg/k during off-test, the concentration of ammonium radical ion in 5 sample point soil samples is respectively:, detailed data as shown in Figure 2; 74.6,57.3,41.7,62.8,88.2mg/kg the concentration of nitrate ion in 5 sample point soil samples is respectively:, detailed data as shown in Figure 3; The pH value is respectively in 5 sample point soil samples: 7.5,7.4,7.4,7.4,7.4, and detailed data is as shown in Figure 4.
When result of the test shows electronic injection nutritive salt under this test parameters, can be good at controlling the variation of pH in the electric device soil and make the more uniform distribution of nutritive salt, for biology in situ renovation of organic pollution thing contaminated soil provides advantage, can effectively improve the efficient of biological restoration.
Claims (2)
1. an electric injects nutritive salt technology, the feature of this technology mainly is included in the occupation mode of electronic injection nutritive salt process electrolyte, the method for operation of electrode, and some test parameters, as voltage gradient, cyclic electrolysis flow velocity, electrode switching interval time etc.
2. according to claim 1 in electronic injection nutritive salt process, it is characterized in that:
(1) two utmost point electrolyte mixing circulation is used, avoided the faint difference of two-stage electrolyte flow rate, cause in the long-time running process, two electrode zones produce the very problem of big-difference, and guaranteed that the soil pH in the electric field is even, solved soil pH in the electronic repair process problem that soda acid changes easily takes place.
(2) method of operation of employing space changing electrode direction can solve electronic injection nutritive salt distribution problem of non-uniform, for biology in situ renovation of organic pollution thing contaminated soil provides advantage.
(3) be 1V/cm in voltage gradient, when the flow velocity of circular electrolyte is 800ml/h, the variation of pH in the energy better controlled electric device soil.
(4) be 1V/cm in voltage gradient, electrolyte is that nutrient salt solution (contains 2g/LNH
4NO
3, KH
2PO
4, the pH value is 7.3), when the flow velocity of circular electrolyte is 800ml/h, the electrode switching interval time is 12h, can make the nutritive salt can more uniform distribution in soil with this understanding,, effectively improve the efficient of biological restoration for biology in situ renovation of organic pollution thing contaminated soil provides advantage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100711604A CN102049411A (en) | 2009-11-05 | 2009-11-05 | Novel electric nutritive salt injection process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100711604A CN102049411A (en) | 2009-11-05 | 2009-11-05 | Novel electric nutritive salt injection process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102049411A true CN102049411A (en) | 2011-05-11 |
Family
ID=43954402
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100711604A Pending CN102049411A (en) | 2009-11-05 | 2009-11-05 | Novel electric nutritive salt injection process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102049411A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103978026A (en) * | 2013-12-05 | 2014-08-13 | 青岛理工大学 | In situ remediation method of Cr (VI)-containing site by utilizing organic waste |
| CN104550216A (en) * | 2014-12-25 | 2015-04-29 | 中国科学院沈阳应用生态研究所 | Method for maintaining uniform potential difference in electrokinetic remediation of polluted soil |
-
2009
- 2009-11-05 CN CN2009100711604A patent/CN102049411A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103978026A (en) * | 2013-12-05 | 2014-08-13 | 青岛理工大学 | In situ remediation method of Cr (VI)-containing site by utilizing organic waste |
| CN104550216A (en) * | 2014-12-25 | 2015-04-29 | 中国科学院沈阳应用生态研究所 | Method for maintaining uniform potential difference in electrokinetic remediation of polluted soil |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102463254A (en) | Novel electrokinetic intensified technology and process for biologically remedying polycyclic aromatic hydrocarbon polluted soil | |
| CN104064794B (en) | A kind of microbiological fuel cell of in-situ remediation of underground water azotate pollution | |
| Yuan et al. | Use of solar cell in electrokinetic remediation of cadmium-contaminated soil | |
| CN104377378B (en) | A kind of microorganism electrochemical device and method for repairing groundwater azotate pollution | |
| CN102941217A (en) | Electric power repairing device and method for cylindrical arrangement electrode | |
| CN104307867B (en) | The apparatus and method of electric driving method combined degradation bacterium repairing polluted soil are poured on surface | |
| CN103286121B (en) | Two-dimensional inhomogeneous electric field experiment method used for electrokinetic restoration of polluted soil | |
| CN104801537A (en) | Electric-microbial combined remediation method for heavy metal contaminated soil | |
| CN205762950U (en) | The processing means of contaminated soil | |
| CN102652955A (en) | Novel process and technology for strengthening electric remediation and bioremediation of polycyclic aromatic hydrocarbon contaminated soil by using surfactant | |
| CN204338567U (en) | Based on the electric osmose system of the electro reclamation heavy-metal contaminated soil of plastic electrode | |
| CN104741369A (en) | Application of molasses in chromium-polluted soil remediation and remediation method | |
| CN204320793U (en) | A kind of horizontal permeable reactive barrier for soil remediation | |
| CN103240268A (en) | Two-dimensional inhomogeneous field experiment device for electrically repairing polluted soil | |
| CN104909526A (en) | Device for removing heavy metals in sludge by using electro-dynamic method and synchronously and deeply dehydrating sludge | |
| CN107983762A (en) | The bioelectrochemistry soil repair system and method for a kind of solar photovoltaic driving | |
| CN103736718A (en) | Electrokinetic remediation method and device of heavy metal contaminated soil | |
| CN102049411A (en) | Novel electric nutritive salt injection process | |
| CN205042873U (en) | Heavy metal contaminated soil processing system | |
| CN102218443A (en) | Novel electric microorganism injecting process | |
| CN111451267B (en) | Electrochemical in-situ automatic control contaminated site remediation system and method | |
| CN105537263B (en) | A kind of restorative procedure of petroleum hydrocarbon contaminated soil | |
| CN105123006A (en) | Urban sludge marginal land renovation method and soil configuration | |
| CN116307530A (en) | Substation water body analysis and treatment method based on Internet of things | |
| CN112147895A (en) | Hydrodynamic circulating intelligent feedback real-time control system and method under external source interference |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110511 |