CN113118201A - Electric synergic remediation method for heavy metal-organic compound contaminated soil based on compressed electric field - Google Patents
Electric synergic remediation method for heavy metal-organic compound contaminated soil based on compressed electric field Download PDFInfo
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- CN113118201A CN113118201A CN202110365388.5A CN202110365388A CN113118201A CN 113118201 A CN113118201 A CN 113118201A CN 202110365388 A CN202110365388 A CN 202110365388A CN 113118201 A CN113118201 A CN 113118201A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
- B09C1/085—Reclamation of contaminated soil chemically electrochemically, e.g. by electrokinetics
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Abstract
The invention relates to a contaminated soil remediation technology, in particular to a heavy metal-organic compound contaminated soil electrokinetic synergistic remediation method based on a compressed electric field. The method specifically comprises the steps of approaching the anode to the cathode in sequence to compress an electric field according to the migration-enrichment of heavy metals and the chemical oxidation of organic pollutants, overcoming the obstacles of heavy metal migration and organic pollutant chemical oxidation in a high pH region formed in a cathode region, and strengthening the migration and enrichment of heavy metals and the chemical oxidation of organic pollutants. The enrichment of heavy metals and the enhanced degradation of organic pollutants are realized in space through a non-isochronous compression electric field, and the synergistic removal of the heavy metals and the organic pollutants is realized in time.
Description
Technical Field
The invention belongs to the technical field of contaminated soil remediation, and particularly relates to a heavy metal-organic compound contaminated soil electrokinetic cooperative remediation method based on a compressed electric field.
Background
With the development of industrialization, the mixture of organic pollutants and inorganic pollutants in soil is increased day by day, and the pollution is serious day by day. According to USEPA reports, over 67% of contaminated sites contain both inorganic and organic contaminants. The pollutants enter the soil to cause changes of the structure, function and biological composition of the soil, so that the metabolic reproduction of indigenous microorganisms is influenced, the growth and development of plants are inhibited, and the human health is even endangered. Therefore, the requirement for repairing the heavy metal-organic compound contaminated soil is very urgent.
At present, the restoration technology of the composite polluted soil mainly comprises phytoremediation, chemical leaching, electric restoration and the like. The three restoration methods are comprehensively compared, so that the plant restoration speed is low, the efficiency is low, and the plant restoration method is not applicable to high-concentration site pollution; the chemical leaching has high cost, is easy to cause secondary pollution, and is not suitable for in-situ remediation and low-permeability soil. The electric restoration is an economic, safe and efficient restoration means, and has good restoration effects on heavy metals and organic pollutants. The repairing mechanism is specifically that under the electrokinetic effect, on one hand, heavy metals are desorbed from the surface of soil particles, and directionally migrate and precipitate the heavy metals; on the other hand, degradation of organic contaminants is promoted by chemical oxidation reactions at and near the anode.
Therefore, according to the mechanism for removing heavy metal and organic pollutants in soil by electrokinetic, if the synergy of the reaction process and time of electrokinetic pair of heavy metal and organic pollutants is fully utilized, the synergistic removal of heavy metal and organic pollutants can be realized, and an efficient technology is provided for the synergistic remediation of the composite contaminated soil.
Disclosure of Invention
The invention aims to provide a compressed electric field-based electric cooperative remediation method for heavy metal-organic composite contaminated soil.
In order to achieve the purpose, the invention adopts the technical scheme that: the electric synergic restoration method of the heavy metal-organic compound contaminated soil based on the compressed electric field comprises the following steps:
controlling the polarity of electrodes provided in the soil, compressing the electric field by sequentially energizing the positive electrode groups; and the electric field is compressed non-isochronously to realize the cooperative remediation of the heavy metal-organic polluted soil.
The electrode groups are multiple groups and are arranged in sequence; there is a space between any adjacent electrode sets.
The electrode group comprises a pair of electrodes with the same polarity.
The control electrode polarity specifically refers to: the electrode groups P1, P2, and P3 are anodes, and P4 is a cathode.
The sequential electrification of the positive electrode groups specifically means that the electrode groups P1 and P4 are electrified firstly, then the electrode groups P2 and P3 are electrified sequentially, and only one positive electrode group is electrified.
The non-isochronous compression electric field specifically includes:
(1) sequentially operating positive electrode group Pi—Pi+n-1And a negative electrode group PjRunning time TiIs an electrode group Pi+1And PjThe time required for enriching the soil until the enrichment amount is larger than a set value is shortened;
(2) operating positive electrode group Pi+nAnd a negative electrode group PjRunning time Ti+1Is an electrode group Pi+1And PjAfter the acid-base mutation surface of the soil is stabilized, the precipitation amount of heavy metal on the acid-base mutation surface is increased until the precipitation amount is larger than a set value.
The invention has the following advantages and beneficial effects:
the invention fully utilizes the directional migration of electric heavy metals and the chemical oxidation of organic pollutants by approaching the anode to the cathode in order to compress the electric field, realizes the enrichment of heavy metals and the enhanced degradation of organic pollutants in space, and realizes the synergistic removal of heavy metals and organic pollutants in time.
Drawings
FIG. 1 is a schematic diagram of an apparatus according to an embodiment of the present invention.
FIG. 2 illustrates the layout and operation of electrodes according to an embodiment of the present invention.
Detailed Description
The invention is further described with reference to specific embodiments and with reference to the accompanying drawings.
The barriers of heavy metal migration and organic pollutant chemical oxidation in a high pH region formed in the cathode region are overcome by sequentially approaching the anode to the cathode to compress the electric field, and the directional migration and enrichment of heavy metals and the chemical oxidation of organic pollutants are enhanced. The synergistic removal of heavy metals and organic pollutants is realized through non-isochronous electric field compression.
The compression electric field specifically means:
(1) the electrode group specifically comprises 4 groups of electrodes, namely P1, P2, P3 and P4 in sequence;
(2) the electrode polarity specifically means that the spacing electrode P1-P3 is a positive electrode, and the electrode P4 is a negative electrode;
(3) the sequential electrification specifically means that the electrode groups P1 and P4 are electrified first, then the electrode groups P2 and P3 are electrified sequentially, and only one group of the positive electrode groups P1, P2 and P3 is electrified.
The non-isochronous compression electric field specifically refers to:
(1) the positive electrode group P1 and the negative electrode group P4 are operated firstly, and the operation time T is1The time for the heavy metal in the soil between P1 and P2 to be enriched in the soil between P2 and P4 until the heavy metal is greater than a set value (such as ≧ 80%);
(2) operating the positive electrode group P2 and the negative electrode group P4 for an operating time T2The time for the heavy metal in the soil between P2 and P3 to be enriched in the soil between P3 and P4 until the heavy metal is greater than a set value (such as ≧ 80%);
(3) operating the positive electrode group P3 and the negative electrode group P4 for an operating time T3The time is the time required for the heavy metal to precipitate on the acid-base mutation surface until the precipitation amount of the heavy metal is more than a set value (such as more than or equal to 80%) after the acid-base mutation surface of the soil between the electrode groups P3 and P4 is stable.
As shown in FIG. 1, the device for electric restoration comprises a soil chamber, electrodes, a power supply, a current and voltage monitoring system and the like. And (3) adjusting the water content of the polluted soil to be 20% -30%, and placing the polluted soil in a soil chamber. An appropriate amount of deionized water was added to the soil during the run to balance the water loss.
The 4 groups of electrodes were arranged in the soil chamber, in the order P1, P2, P3, P4.
The P1 and the P4 are electrified firstly, the P1 is the anode, the P4 is the cathode, the P2 and the P3 are not electrified, and the running time is determined by the enrichment amount of heavy metals in the soil between the P1 and the P2 in the soil between the P2 and the P4. Specifically, through experiments, the electro-migration speed of heavy metals in soil under different pH gradient conditions is measured, when the enrichment amount of heavy metals in P2-P5 is more than or equal to 80% between P1-P2, the operation of P1 is stopped, and the operation time is marked as T1. At the same time, the electrode P1Nearby organic contaminants are removed by chemical oxidation.
Then P2 and P4 are sequentially electrified to compress an electric field to promote the migration of heavy metals to a cathode and the chemical oxidation of organic matters. The running time T2 is determined by the enrichment amount of heavy metals in the soil between P2 and P3 in the soil between P3 and P4 respectively.
And finally, electrifying the P3 and the P4, stopping running when the acid-base mutation surface of the soil between the electrode groups P3 and P4 is stable and the precipitation amount of heavy metals in the acid-base mutation surface is more than or equal to 80 percent, and recording the running time as T3. At the same time, organic contaminants near electrode P3 are removed by chemical oxidation.
Therefore, the electric field is gradually compressed towards the cathode by the sequential operation of the electrodes P1-P3, and the synergic removal of heavy metals and organic pollutants in the soil is realized.
Example 1
The polluted soil repaired by the embodiment is self-prepared Cd and pyrene composite polluted soil. The clean soil is 0-20cm of surface soil in Shenbei New zone of Liaoning province, and the soil is loam. Naturally drying the soil without stones and plant roots, sieving the soil with a 20-mesh sieve, and artificially preparing the composite contaminated soil with Cd and pyrene concentrations of about 100 mg/kg. And (5) air-drying the polluted soil, and measuring the pH of the soil to be 6.1. The soil humidity was adjusted to 30% with deionized water and loaded into a soil chamber. The concrete specifications of the soil chamber are as follows: the length is 32cm, the width is 17cm and the height is 10 cm. An appropriate amount of deionized water was added to the soil during the run to balance the water loss.
The repairing device adopted by the embodiment of the invention is shown in figure 1, and the device mainly comprises a soil chamber, an electrode, a power supply and a voltage and current monitoring system. 4 groups of electrodes are arranged in the polluted soil, namely P1, P2, P3 and P4. The electrodes are stainless steel columnar electrodes with the diameter of 1cm and the height of 10 cm. The electrode P1 and the electrode P4 are placed at two ends of the soil chamber and are converged by 32cm, and the distance between the electrodes P1, P2, P3 and P4 is 10 cm. The voltage of the DC power supply for the experiment is 30V, and the electrode is connected with the power supply through a lead.
The electric repair is carried out for 45 days, wherein T1-T3 are respectively 13 days, 17 days and 15 days.
The P1 and the P4 are electrified firstly, the P1 is the anode, the P4 is the cathode, the P2 and the P3 are not electrified, and then the P2 is operated, and the operation time is T1 and T2 respectively. And (3) promoting the migration of Cd by sequentially operating a compression electric field through the positive electrode group, and simultaneously removing pyrene near the positive electrode by chemical oxidation.
The run time was determined by the enrichment of Cd. Through experiments, the average moving speed of the acid surface to the cathode is respectively 0.8, 1.2 and 1.6cm/d under the conditions that the voltage gradient is 1, 1.5 and 3V/cm. The migration speed of Cd in soil is about 10cm/d and 6.6cm/d when the pH of Cd is =2.5 and 3.5 respectively, and T1 and T3 are 13d and 17d respectively by combining the speeds.
And finally, electrifying the P3 and the P4, stopping running when the acid-base mutation surface of the soil between the electrode groups P3 and P4 is stable and the precipitation amount of heavy metals in the acid-base mutation surface is more than or equal to 80 percent, and recording the running time as T3. At the same time, organic contaminants near electrode P3 are removed by chemical oxidation. Experiments prove that the soil pH is stable after 12 days, and the operation time is 15 days when the precipitation amount of heavy metals on the acid-base mutation surface is more than or equal to 80%.
After 45 days (T)1+T2+T3) The Cd enriched between P3 and P4 accounts for 83.2 percent of the total content of Cd in the soil, and the total removal rate of pyrene in the soil reaches 64.8 percent.
Example 2
The difference from the embodiment 1 is that: the soil for experiments is self-prepared Pd and n-hexadecane composite polluted soil, the concentration of Pd is 200mg/kg, and the concentration of n-hexadecane is 500 mg/kg. The total treatment time is 60 days, wherein T1-T3 are 15 days, 20 days and 17 days respectively. After 52 days of treatment, 74.3 percent of Pd in the soil is enriched between P3 and P4, and the total removal rate of the n-hexadecane in the soil reaches 55.3 percent.
Example 3
The differences from examples 1 and 2 are that: the pollutants in the soil are various heavy metals and organic matters. The experimental soil is the polluted soil around a smelting plant, heavy metal pollutants in the soil mainly comprise Pb, Cd, Zn, Ni, Cu and the like, the concentrations of the heavy metal pollutants are respectively 98.73mg/kg, 8.64mg/kg, 105.52mg/kg, 35.68mg/kg and 25.84mg/kg, organic pollutants are mainly polycyclic aromatic hydrocarbons, and the total concentration of the polycyclic aromatic hydrocarbons is controlled by 16 EPA in a priority mode to be 563 mg/kg. The total treatment time was 63 days.
Through experimental measurement, under the same pH condition, the migration speed of Cu in the soil is the slowest in five heavy metals, so that the Cu enrichment amount is calculated, and the running time, namely the mode time T1-T3, is respectively 20 days, 25 days and 18 days.
After 63 days of treatment, the amounts of heavy metals Pb, Cd, Zn, Ni and Cu enriched between P3 and P4 respectively account for 44.3%, 72.5%, 75.6%, 59.3% and 32.6% of the total content of the soil, and the removal rate of the polycyclic aromatic hydrocarbon reaches 35.3%.
The foregoing is a more detailed description of the present invention, taken in conjunction with the accompanying preferred embodiments, and is not intended to limit the invention to the particular forms disclosed. Several simple deductions or substitutions can be made without departing from the concept of the present invention, and should be considered as belonging to the protection scope of the present invention.
Claims (6)
1. The electric synergic restoration method of the heavy metal-organic compound contaminated soil based on the compressed electric field is characterized by comprising the following steps: controlling the polarity of electrodes provided in the soil, compressing the electric field by sequentially energizing the positive electrode groups; and the electric field is compressed non-isochronously to realize the cooperative remediation of the heavy metal-organic polluted soil.
2. The electric cooperative repairing method for heavy metal-organic composite polluted soil based on compressed electric field as claimed in claim 1, characterized in that said electrode sets are in multiple groups and arranged in sequence; there is a space between any adjacent electrode sets.
3. The method for electrokinetic cooperative remediation of heavy metal-organic composite contaminated soil based on compressed electric field according to claim 1 or 2, wherein the electrode set comprises a pair of electrodes having the same polarity.
4. The electric cooperative remediation method of heavy metal-organic composite contaminated soil based on a compressed electric field according to claim 1, characterized in that: the control electrode polarity specifically refers to: the electrode groups P1, P2, and P3 are anodes, and P4 is a cathode.
5. The electric cooperative remediation method of heavy metal-organic composite contaminated soil based on a compressed electric field according to claim 1, characterized in that: the sequential electrification of the positive electrode groups specifically means that the electrode groups P1 and P4 are electrified firstly, then the electrode groups P2 and P3 are electrified sequentially, and only one positive electrode group is electrified.
6. The electric cooperative restoration method for heavy metal-organic composite contaminated soil based on the compressed electric field according to claim 1, wherein the non-isochronous compressed electric field specifically means:
(1) sequentially operating the positive electrode group Pi-Pi + n-1 and the negative electrode group Pj, wherein the operation time Ti is the time required by the enrichment amount in the soil between the electrode groups Pi +1 and Pj until the enrichment amount is larger than a set value;
(2) and (3) operating the positive electrode group Pi + n and the negative electrode group Pj, wherein the operation time Ti +1 is the time required by the precipitation amount of heavy metals on the acid-base mutation surface until the precipitation amount is more than a set value after the acid-base mutation surface of the soil between the electrode groups Pi +1 and Pj is stabilized.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116603852A (en) * | 2023-06-15 | 2023-08-18 | 江苏暨之阳环保科技有限公司 | Electrocatalytic spray repair process and equipment for heavy metal contaminated soil |
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| US6145244A (en) * | 1998-12-11 | 2000-11-14 | Lynntech, Inc. | Methods for enhancing phytoextraction of contaminants from porous media using electrokinetic phenomena |
| WO2005053866A1 (en) * | 2003-12-04 | 2005-06-16 | Appelbloesem Licenties B.V. | Electrically enhanced in situ remediation of contaminated soil |
| CN106269843A (en) * | 2016-11-02 | 2017-01-04 | 中建中环工程有限公司 | The in-situ remediation method of one heavy metal species organic co-contaminated soil |
| CN108262355A (en) * | 2018-04-19 | 2018-07-10 | 中国科学院沈阳应用生态研究所 | The electronic cooperative repair method of combined contamination soil based on subregion electric field |
| CN109013692A (en) * | 2018-08-21 | 2018-12-18 | 广东环境保护工程职业学院 | Method for strengthening remediation of heavy metal contaminated soil and application |
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2021
- 2021-04-06 CN CN202110365388.5A patent/CN113118201A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6145244A (en) * | 1998-12-11 | 2000-11-14 | Lynntech, Inc. | Methods for enhancing phytoextraction of contaminants from porous media using electrokinetic phenomena |
| WO2005053866A1 (en) * | 2003-12-04 | 2005-06-16 | Appelbloesem Licenties B.V. | Electrically enhanced in situ remediation of contaminated soil |
| CN106269843A (en) * | 2016-11-02 | 2017-01-04 | 中建中环工程有限公司 | The in-situ remediation method of one heavy metal species organic co-contaminated soil |
| CN108262355A (en) * | 2018-04-19 | 2018-07-10 | 中国科学院沈阳应用生态研究所 | The electronic cooperative repair method of combined contamination soil based on subregion electric field |
| CN109013692A (en) * | 2018-08-21 | 2018-12-18 | 广东环境保护工程职业学院 | Method for strengthening remediation of heavy metal contaminated soil and application |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116603852A (en) * | 2023-06-15 | 2023-08-18 | 江苏暨之阳环保科技有限公司 | Electrocatalytic spray repair process and equipment for heavy metal contaminated soil |
| CN116603852B (en) * | 2023-06-15 | 2023-11-03 | 江苏暨之阳环保科技有限公司 | Electrocatalytic spray repair process and equipment for heavy metal contaminated soil |
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