CN105562427A - Treatment method of Benzo(a)pyrene contaminated soil - Google Patents
Treatment method of Benzo(a)pyrene contaminated soil Download PDFInfo
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- CN105562427A CN105562427A CN201510486974.XA CN201510486974A CN105562427A CN 105562427 A CN105562427 A CN 105562427A CN 201510486974 A CN201510486974 A CN 201510486974A CN 105562427 A CN105562427 A CN 105562427A
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Abstract
The invention discloses a treatment method of benzo(a)pyrene contaminated soil, comprising the steps: air drying or baking wheat stalks, and pyrolyzing at 300-350 DEG C for 6-8 hours to obtain biochar; crushing wheat stalks and wheat bran separately, sieving with a 100-mesh sieve, mixing well according to a ratio of 4:1 to obtain cellulose, and sterilizing under high pressure (at 121 DEG C for 20 min); mixing the biochar, the cellulose and the benzo(a)pyrene contaminated soil according to a mass ratio of 1:1:8, adjusting moisture to 40 % of maximum water holding capacity of a field and mixing well, and treating in the absence of light at 25-30 DEG C. The treatment method is nontoxic, low in cost and free of secondary contamination to environment, and a good soil improver may be obtained after the biochar and the cellulose are added to the soil, thus improving soil productivity; both the biochar and the cellulose are prepared from agricultural wastes, the raw materials are low in price and good for environmental protection, the need for cyclic economy development is met, and the biochar and the cellulose have a promising prospect of application in contaminated soil remediation.
Description
Technical field
The present invention relates to a kind of processing method of contaminated soil, be specifically related to a kind of macromolecule polycyclic aromatic hydrocarbon, i.e. the administering method of benzo (a) pyrene contaminated soil.
Background technology
Benzo (a) pyrene in environment be mainly derived from flue gas that coal tar, all kinds of carbon black and the burning such as coal, oil produce, smoke from cigarette, in vehicle exhaust, and in the trade effluent such as coking, oil refining, pitch, plastics and soil.It has chronic toxicity and carcinogenic, teratogenesis, mutagenic " three cause " effect.Many countries all carried out benzo (a) pyrene investigation of content in soil, residual concentration depends on character and the distance of pollution sources, in the soil of busy highway both sides, benzo (a) pyrene content is 2.0mg/kg, is 200mg/kg near oil plant in soil; By coal tar, in pitch contaminated soil, can up to 650mg/kg.The eighties in 20th century, the blacklist of priority pollutant in was just listed the polycyclic aromatic hydrocarbon of 16 Zhong Weidai branches by EPA, was classified as top-priority environmental persistence organic pollution by many countries simultaneously.
At present, the method for administering benzo (a) pyrene contaminated soil mainly contains peripheral doses, chemical redemption and biological prosthetic.Physical chemistry rehabilitation cost is expensive, the environment of destructible soil ecosystem, be not suitable for large-scale application, cost be low because having for bioremediation technology (comprising microorganism remediation and phytoremediation), non-secondary pollution, can the particular advantages such as large-area applications and being more and more subject to people's attention.But the structure of large molecule polycyclic aromatic hydrocarbon makes the degraded of the enzymatic polycyclic aromatic hydrocarbon of microorganism can occur in different sites, makes the degradation process of polycyclic aromatic hydrocarbon have number of ways, and then microorganism remediation polycyclic aromatic hydrocarbon pollution is made to be subject to multifactorial restriction perhaps.While utilizing microorganism to carry out contaminated soil remediation, in soil, adding cellulose and charcoal to strengthen microorganism remediation organic pollution effect, is important topic in current research.
Many difficult problems such as large for soil benzo (a) pyrene pollution plot difficulty, cost is high, method is few, seek that a kind of cost is low, efficiency is high, suit measures to local conditions, the administering method of benzo (a) pyrene contaminated soil simple to operate, become key of the present invention.
Summary of the invention
The object of the present invention is to provide a kind of macromolecule polycyclic aromatic hydrocarbon, the i.e. administering method of benzo (a) pyrene contaminated soil, the method has that cost is low, efficiency is high, suits measures to local conditions, simple to operate, secondary pollution can not be caused to environment, the advantage of utilization of resources can be realized.
Technical scheme of the present invention is as follows:
A kind of administering method of benzo (a) pyrene contaminated soil, be by adsorbent with the mass ratio of 15-20% join more than 20cm by benzo (a) pyrene contaminated soil top layer, mixing of turning over;
Described, benzo (a) pyrene adsorbent is prepared by following steps:
1) dried and simple crushing by wheat-straw, obtain charcoal in Muffle furnace at 300-350 DEG C after pyrolysis 6-8 hour, cross 100 mesh sieve, by washed with de-ionized water, 60-70 DEG C in baking oven, dries 2-3 hour; 2) cross 100 mesh sieve by after straw and the fragmentation of wheat bran difference, mix as cellulose using the ratio of 4:1, autoclaving (121 DEG C, 20 minutes) is for subsequent use; 3) charcoal and cellulose press the quality of 1:1 than Homogeneous phase mixing, as benzo (a) pyrene adsorbent; 4) benzo (a) pyrene adsorbent with mixed with the mass ratio of 15-20% by benzo (a) pyrene contaminated soil after, regulate moisture be maxmun field capacity 40% and fully mixing, lucifuge process at 25-30 DEG C.
Described, be 50-150mg/Kg by the concentration of benzo (a) pyrene in benzo (a) pyrene contaminated soil.
Beneficial effect of the present invention: processing method of the present invention is nontoxic, and cost is low, can not cause secondary pollution to environment, and add charcoal and cellulose in soil after, can be used as a kind of excellent soil conditioner, improves the productivity of soil; Charcoal and cellulose are all prepared with agricultural wastes, and low in raw material price is conducive to environmental protection, meet the needs of recycling economy development, have good contaminated soil remediation application prospect.
Detailed description of the invention
According to following embodiment, the present invention may be better understood.But those skilled in the art will readily understand, the content described by embodiment only for illustration of the present invention, and should can not limit the present invention described in detail in claims yet.
embodiment 1
A kind of administering method of benzo (a) pyrene contaminated soil, that charcoal and cellulose are joined more than 20cm's with the mass ratio of 1:1, the concentration polluted by benzo (a) pyrene is the upper soll layer of 50mg/Kg, the amount added is 1/8 of polluted soil total amount, turn over, the clearance obtaining benzo (a) pyrene through detection computations after 3 days is 88.52%;
Described, detecting step is: 4g pedotheque is placed in tool plug glass centrifuge tube, adds 30mL ethane and carrene (1:1), carries out ultrasonic, ultrasonic time 20 minutes, keeps water temperature at 20-30 DEG C, prevents solution from seething with excitement.Ultrasonic complete after carry out centrifugal 15 minutes of 2200rpm.Get supernatant, in triplicate.Concentrating with revolving steaming instrument, solution replacement being become acetonitrile, carries out liquid phase test.0.22 μm of filter membrane is crossed before test.Mobile phase is acetonitrile-water (95/5), and chromatographic column is: the XDB-C18 post of 4.6 × 150mm, column temperature 25 DEG C, flow velocity 1mLmin-1, wavelength 254nm.
embodiment 2
A kind of administering method of benzo (a) pyrene contaminated soil, that charcoal and cellulose are joined more than 20cm's with the mass ratio of 1:1, the concentration polluted by benzo (a) pyrene is the upper soll layer of 50mg/Kg, the amount added is 1/8 of polluted soil total amount, turn over, the clearance obtaining benzo (a) pyrene through detection computations after 7 days is 91.89%;
Described, detecting step is: 4g pedotheque is placed in tool plug glass centrifuge tube, adds 30mL ethane and carrene (1:1), carries out ultrasonic, ultrasonic time 20 minutes, keeps water temperature at 20-30 DEG C, prevents solution from seething with excitement.Ultrasonic complete after carry out centrifugal 15 minutes of 2200rpm.Get supernatant, in triplicate.Concentrating with revolving steaming instrument, solution replacement being become acetonitrile, carries out liquid phase test.0.22 μm of filter membrane is crossed before test.Mobile phase is acetonitrile-water (95/5), and chromatographic column is: the XDB-C18 post of 4.6 × 150mm, column temperature 25 DEG C, flow velocity 1mLmin-1, wavelength 254nm.
embodiment 3
A kind of administering method of benzo (a) pyrene contaminated soil, that charcoal and cellulose are joined more than 20cm's with the mass ratio of 1:1, the concentration polluted by benzo (a) pyrene is the upper soll layer of 150mg/Kg, the amount added is 1/8 of polluted soil total amount, turn over, the clearance obtaining benzo (a) pyrene through detection computations after 3 days is 84.14%;
Described, detecting step is: 4g pedotheque is placed in tool plug glass centrifuge tube, adds 30mL ethane and carrene (1:1), carries out ultrasonic, ultrasonic time 20 minutes, keeps water temperature at 20-30 DEG C, prevents solution from seething with excitement.Ultrasonic complete after carry out centrifugal 15 minutes of 2200rpm.Get supernatant, in triplicate.Concentrating with revolving steaming instrument, solution replacement being become acetonitrile, carries out liquid phase test.0.22 μm of filter membrane is crossed before test.Mobile phase is acetonitrile-water (95/5), and chromatographic column is: the XDB-C18 post of 4.6 × 150mm, column temperature 25 DEG C, flow velocity 1mLmin-1, wavelength 254nm.
embodiment 4
A kind of administering method of benzo (a) pyrene contaminated soil, that charcoal and cellulose are joined more than 20cm's with the mass ratio of 1:1, the concentration polluted by benzo (a) pyrene is the upper soll layer of 150mg/Kg, the amount added is 1/8 of polluted soil total amount, turn over, the clearance obtaining benzo (a) pyrene through detection computations after 7 days is 89.55%;
Described, detecting step is: 4g pedotheque is placed in tool plug glass centrifuge tube, adds 30mL ethane and carrene (1:1), carries out ultrasonic, ultrasonic time 20 minutes, keeps water temperature at 20-30 DEG C, prevents solution from seething with excitement.Ultrasonic complete after carry out centrifugal 15 minutes of 2200rpm.Get supernatant, in triplicate.Concentrating with revolving steaming instrument, solution replacement being become acetonitrile, carries out liquid phase test.0.22 μm of filter membrane is crossed before test.Mobile phase is acetonitrile-water (95/5), and chromatographic column is: the XDB-C18 post of 4.6 × 150mm, column temperature 25 DEG C, flow velocity 1mLmin-1, wavelength 254nm.
Claims (6)
1. an administering method for benzo (a) pyrene contaminated soil, is characterized in that, by benzo (a) pyrene adsorbent with the mass ratio of 15-20% join more than 20cm by benzo (a) pyrene contaminated soil top layer, mixing of turning over.
2. adsorbent according to claim 1 is prepared by following steps:
(1) dried and simple crushing by wheat-straw, obtained charcoal after pyrolysis 6-8 hour at 300-350 DEG C, cross 100 mesh sieve, with washed with de-ionized water, oven dry, temperature is 60-70 DEG C, and the time is 2-3 hour;
(2) wheat-straw and wheat bran are pulverized rear mistake 100 mesh sieve respectively, mix as cellulose using the ratio of 4:1, autoclaving (121 DEG C, 20 minutes) is for subsequent use;
(3) charcoal and cellulose press the quality of 1:1 than Homogeneous phase mixing, as benzo (a) pyrene adsorbent;
(4) benzo (a) pyrene adsorbent with mixed with the mass ratio of 15-20% by benzo (a) pyrene contaminated soil after, regulate moisture be maxmun field capacity 40% and fully mixing, lucifuge process at 25-30 DEG C.
3. administering method according to claim 1, is characterized in that, described is 50-150mg/Kg by the concentration of benzo (a) pyrene in the soil of benzopyrene pollution.
4. absorbent preparation step according to claim 2, is characterized in that, described cellulose is that after wheat-straw and wheat bran mix with the ratio of 4:1, autoclaving obtains.
5. benzo (a) pyrene adsorbent according to claim 2, is characterized in that, described benzo (a) pyrene adsorbent is that charcoal and cellulose are more obtained than Homogeneous phase mixing by the quality of 1:1.
6. processing mode according to claim 2, is characterized in that, described adsorbent mixes with the mass ratio of 15-20% with polluted soil, lucifuge process at 25-30 DEG C.
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| CN107470334A (en) * | 2017-07-03 | 2017-12-15 | 浙江海洋大学 | A kind of compounding renovation agent for being used to clear up petroleum-polluted soil |
| CN107502363A (en) * | 2017-08-31 | 2017-12-22 | 广州公孙策信息科技有限公司 | A kind of benzopyrene pollution soil remediation material and preparation method thereof |
| CN112745857A (en) * | 2019-10-31 | 2021-05-04 | 中国石油化工股份有限公司 | Biological agent for repairing polycyclic aromatic hydrocarbon polluted soil |
| CN115318812A (en) * | 2022-08-25 | 2022-11-11 | 广东工业大学 | Method for repairing benzo (a) pyrene polluted soil |
| CN117225877A (en) * | 2023-09-08 | 2023-12-15 | 中国科学院生态环境研究中心 | Treatment method for benzo (a) pyrene pollution in soil |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107470334A (en) * | 2017-07-03 | 2017-12-15 | 浙江海洋大学 | A kind of compounding renovation agent for being used to clear up petroleum-polluted soil |
| CN107502363A (en) * | 2017-08-31 | 2017-12-22 | 广州公孙策信息科技有限公司 | A kind of benzopyrene pollution soil remediation material and preparation method thereof |
| CN112745857A (en) * | 2019-10-31 | 2021-05-04 | 中国石油化工股份有限公司 | Biological agent for repairing polycyclic aromatic hydrocarbon polluted soil |
| CN115318812A (en) * | 2022-08-25 | 2022-11-11 | 广东工业大学 | Method for repairing benzo (a) pyrene polluted soil |
| CN117225877A (en) * | 2023-09-08 | 2023-12-15 | 中国科学院生态环境研究中心 | Treatment method for benzo (a) pyrene pollution in soil |
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Application publication date: 20160511 |