CN107144666A - River bottom mud environment-friendly dredging depth based on polycyclic aromatic hydrocarbon ecological risk determines method - Google Patents
River bottom mud environment-friendly dredging depth based on polycyclic aromatic hydrocarbon ecological risk determines method Download PDFInfo
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- CN107144666A CN107144666A CN201710251409.4A CN201710251409A CN107144666A CN 107144666 A CN107144666 A CN 107144666A CN 201710251409 A CN201710251409 A CN 201710251409A CN 107144666 A CN107144666 A CN 107144666A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
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Abstract
A kind of river bottom mud environment-friendly dredging depth based on polycyclic aromatic hydrocarbon ecological risk of the present invention determines method, main to include three steps：The optimal Sediment Dredging depth of sample collection analysis, pollutant analysis on Ecological Risk, calculating.River bottom mud dredging main purpose is to reduce the polycyclic aromatic hydrocarbon accumulation of river sediments, to reduce the quantity that polycyclic aromatic hydrocarbon is discharged into the water body of upper strata, so as to avoid ecological environment from being encroached on.And the key of Sediment Dredging is the determination of dredging depth, critical dredging depth method proposed by the invention can quickly, accurately draw river bottom mud dredging depth.
Description
Technical field
The present invention relates to field of environment protection, more particularly to a kind of river bottom mud environmental protection based on polycyclic aromatic hydrocarbon ecological risk
Dredging depth determines method.
Background technology
Polycyclic aromatic hydrocarbon is the important pollutant that river bottom mud dredging needs to control, and it endangers water ecosystem, Ju Minshen
Body health.They usually contain the organic compound of up to 10 aromatic rings, and it is by pyroreaction such as fossil fuel and other has
The imperfect combustion of machine material and pyrolysis and the release of oil and oil product and produce.Due to solubility of the PAHs in water
It is generally relatively low, and reduced with the increase of molecular weight, therefore, they remove often through settlement action from water body.It is heavy
PAHs in product thing can influence water quality and induction accumulation to cause the long-term change of biota with the food chain of bottom at the middle and upper levels
Change.In recent years, the polycyclic aromatic hydrocarbon in the deposits such as lake, river, ocean is conducted extensive research both at home and abroad, it is special in distribution
Levy and the assessment of ecological risk on make some progress.
But deposit is as potential pollution sources, in order to prevent secondary pollution, it is necessary to which take appropriate measures control.At present
Mainly there are the conventional repair techniques such as dredging, capping and biological reinforced, plant for the minimizing technology of organic pollution in deposit
The biotechnologys such as reparation.Dredging is because pollutant can be removed forever, by countries in the world extensive use, correlation technique more into
It is ripe.Wherein dredging depth is an important parameter.Because dredging technology cost is huge, less dredging depth can reduce institute
Use is cost, but ensures to reduce the purpose that polycyclic aromatic hydrocarbon is poisoned again, therefore, rational dredging depth is established particularly significant.But
At this stage for reducing the dredging depth determination method of polycyclic aromatic hydrocarbon concentration, clear and definite scheme there is no.
River bottom mud dredging main purpose is to reduce the polycyclic aromatic hydrocarbon accumulation of river sediments, to reduce polycyclic aromatic hydrocarbon release
To the quantity in the water body of upper strata, so as to avoid ecological environment from being encroached on.And the key of Sediment Dredging is the determination of dredging depth,
Critical dredging depth method proposed by the invention can quickly, accurately draw river bottom mud dredging depth.
The content of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of river bottom mud environmental protection based on polycyclic aromatic hydrocarbon ecological risk is dredged
Dredge depth determination method.
A kind of river bottom mud environment-friendly dredging depth based on polycyclic aromatic hydrocarbon ecological risk determines method, main to include three steps
Suddenly：The optimal Sediment Dredging depth of sample collection, pollutant analysis on Ecological Risk, calculating.Wherein step 1 sample collection include with
Lower step：
Step 1 (a) carries out Stratified Sampling to the river bottom mud of appointed place, and each sample is every downwards from bed mud top layer
Interval 10cm takes a mud sample, obtains several sediment samples；
The bed mud sample collected is laid on glassware by step 1 (b) in time, in the stronger cool place of air flow property
The foreign matters such as gravel, junk, plant and animal residues in place's natural air drying, rejecting sample, after being pulverized with wooden stick, sieving is removed
More than 2mm sandstone, roll ring grizzly (100 mesh) with mortar again after mixing and obtain more thin soil sample, then seal soil sample
Storage.
Sample is laid on clean A4 paper by step 1 (c), and being placed in sunlight can not straight shot places natural air drying.Gone after air-drying
Levigate with mortar except the grass roots and handstone in sample, weighing 2g soil samples, (surface soil sample takes every 4 samples of same region collection
The mass mixings such as product are into a sample), add 15ml dichloromethane, the ultrasonic extraction 1h in ultrasonic water bath, 2500rpm centrifugations 5
Minute, then take 2mL supernatants to cross 2.5g silica gel column purifications, and divided with dichloromethane and n-hexane (v/v, 1/1) eluent 15mL
Elute twice, eluent is collected to 50mL round-bottomed flasks, adds 30 μ L dimethyl sulfoxide (DMSO)s, 40 DEG C of constant temperature are dense on a rotary evaporator
It is reduced to dry, 2mL is settled to acetonitrile, is analyzed after finally crossing 0.22 μ L filter membranes with high performance liquid chromatograph.
Quotient method is widely used in predicting that multiple pollutant is (such as in ocean, river drift in the average benefit of step 2：
PAHs, heavy metal etc.) joint toxicity risk analysis.PAHs MERM is obtained by one-component PAH numerical value, to PAHs synthesis
Ecological risk is analyzed, and risk analysis refers to following formula：
Wherein CiIt is i-th kind of PAH concentration；N represents PAHs species number；ERMi represents the ERM corresponding to i-th kind of PAH
Numerical value, its concrete numerical value sees attached list one, and the comprehensive ecological risk in river course is calculated by formula (1).
Step 3 is based on the MERM comprehensive ecological risks in step 2, and it is vertical in river bottom mud to combine studied area PAHs
Upward distribution situation, optimal Sediment Dredging depth is calculated according to formula (2), (3), critical dredging depth is referred to as.
H=max { hi} (2)
H represents optimal dredging depth in formula；DoRepresent river bottom mud PAHs risk control level；D(hi) represent ecological wind
River course depth (h corresponding to danger (D)i)；ε represents an infinitesimal arithmetic number；hiRepresent to meet for i-th the bed mud of formula (3)
Depth.By D in the present inventionoValue is 0.1, i.e., by ecological risk control in middle hypotoxicity.
Beneficial effects of the present invention：
1st, based on quotient method in average benefit, propose and construct critical dredging depth method, it is practical in detail.
2nd, rational Sediment Dredging depth can fast and accurately be determined using this method.
3rd, it is convenient to determine with the Sediment Dredging depth recommendation of various target contaminants.
4th, it is applied widely, a variety of polycyclic aromatic hydrocarbons are applicable.
5th, " a kind of river bottom mud environment-friendly dredging depth determination side based on polycyclic aromatic hydrocarbon ecological risk proposed by the present invention
Method " compensate for the deficiency for " bathmometry " commonly used in current engineering practice.Environment-friendly dredging depth volume is determined in current engineering practice
It is use " bathmometry " more, i.e., from pollutant along bed mud thickness direction on Vertical Distribution Characteristics find out " flex point " (pollutant concentration
The point reduced suddenly), using " flex point " more than thickness be used as dredging depth.But " bathmometry " is very big by the subjective impact of people.And
Proposition volume method of the present invention can quantify and calculate river bottom mud environment-friendly dredging depth, overcome the subjectivity that current " bathmometry " is present
The problem of property.
Brief description of the drawings
Fig. 1 is the PAHs concentration profiles in the bed mud of Korea Spro family's bridge section；
Fig. 2 is Korea Spro family's bridge river channel ecology risk map.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.
Embodiment 1：
Enforcement place is described：Pinghu City is located in Yangtze River Delta, northern positioned at Hangjiahu Plain, and its domestic river course is close in length and breadth
Cloth, has the big bar of river channel more than 3000, overall length is about 2259km, and water area is about 45.01km2.In recent years, with industry
With the development of agricultural, a large amount of industrial and agricultural wastewaters, sanitary sewage are unprocessed to be directly discharged into water body, waste water comprising a large amount of many cyclophanes
Hydrocarbon, makes river and surface deposits all receive different degrees of polycyclic aromatic hydrocarbons contaminated this example of to the domestic Korea Spro family's bridge in Pinghu City
River bottom mud be acquired so that the optimal dredging depth to determine the river course.
Step 1 (a)：With reference to Pinghu basin feature, the present embodiment is entered using sediment sampler to Han Jiaqiao river bottom mud
Row Stratified Sampling, each sample takes a mud sample at interval of 10cm downwards from bed mud top layer, and 90cm place is adopted downwards, is obtained
To 10 sediment samples.
The bed mud sample collected is laid on glassware by step 1 (b) in time, in the stronger cool place of air flow property
The foreign matters such as gravel, junk, plant and animal residues in place's natural air drying, rejecting sample, after being pulverized with wooden stick, sieving is removed
More than 2mm sandstone, roll ring grizzly (100 mesh) with mortar again after mixing and obtain more thin soil sample, then seal soil sample
Storage.
Sample is laid on clean A4 paper by step 1 (c), and being placed in sunlight can not straight shot places natural air drying.Gone after air-drying
Levigate with mortar except the grass roots and handstone in sample, weighing 2g soil samples, (surface soil sample takes every 4 samples of same region collection
The mass mixings such as product are into a sample), add 15ml dichloromethane, the ultrasonic extraction 1h in ultrasonic water bath, 2500rpm centrifugations 5
Minute, then take 2mL supernatants to cross 2.5g silica gel column purifications, and divided with dichloromethane and n-hexane (v/v, 1/1) eluent 15mL
Elute twice, eluent is collected to 50mL round-bottomed flasks, adds 30 μ L dimethyl sulfoxide (DMSO)s, 40 DEG C of constant temperature are dense on a rotary evaporator
It is reduced to dry, 2mL is settled to acetonitrile, is analyzed after finally crossing 0.22 μ L filter membranes with high performance liquid chromatograph.
The Vertical Distribution Characteristics for the PAHs that step 2 is probed into according to the sample gathered in step 1 in river bottom mud, Han Jiaqiao
Change in concentration of the middle different polycyclic aromatic hydrocarbons at different depth is as shown in Figure 1 and shown in table 1.
Table 1 is the risk assessment value (unit of bed mud polycyclic aromatic hydrocarbon：ng/g)
The average value of polycyclic aromatic hydrocarbon total amount is about 3845.99ng/g in Han Jiaqiao, and fluctuating ripple is presented in it in vertical direction
Dynamic, naphthalene, acenaphthene, fluorenes, benzo [a] anthracene, benzo [k] fluoranthene occur in that high content at top layer, depth 50cm, 90cm,
Luxuriant and rich with fragrance is also to occur in that higher content at 50cm, 70cm, 90cm in depth, thus can deduce, be deposited in the corresponding period
In bed mud, there is special pollutant emission, may is that at that time has significant pollution accident to occur on this river course.
The vertical upper ecological risk of river bottom mud is calculated according to formula (1), and according to ecological risk value drafting pattern 2, afterwards
Calculated according to formula (2-3) and obtain the critical dredging depth of river bottom mud.Observe Fig. 2 to understand, the vertical MERM numerical intervals of Han Jiaqiao
Scope is middle hypotoxicity between 0.01~0.52, and the possibility for producing toxicity is 30%.
Step 3 determines the dredging depth in river course according to acquisition ecological risk value in step 2.Dotted line is risk control in Fig. 2
Level (D0), on the premise of monitoring depth bounds and meeting formula (3) requirement, work as D0When=0.1, its dredging depth is about
60cm；Work as D0When=0.5, its dredging depth is about 50cm.By calculating, bottom of Korea Spro family's bridge basin using PAHs as target contaminant
Mud dredging depth recommendation is 50-60cm.
Claims (3)
1. a kind of river bottom mud environment-friendly dredging depth based on polycyclic aromatic hydrocarbon ecological risk determines method, it is characterised in that：According to
Polycyclic aromatic hydrocarbon ecological risk determines river bottom mud environment-friendly dredging depth, can quantify and calculate river bottom mud environment-friendly dredging depth.
2. a kind of river bottom mud environment-friendly dredging depth determination side based on polycyclic aromatic hydrocarbon ecological risk according to claim 1
Method, it is characterised in that：Comprise the following steps：
Step 1 gathers the PAHs concentration values that sample analysis obtains different depth in river course；
Step 2 obtains PAHs MERM according to the one-component PAH numerical value in step one, analyzes PAHs ecological risk；
Step 3 combines studied area PAHs on river bottom mud is vertical based on the MERM comprehensive ecological risks in step 2
Distribution situation, calculate optimal Sediment Dredging depth.
3. a kind of river bottom mud environment-friendly dredging depth determination side based on polycyclic aromatic hydrocarbon ecological risk according to claim 2
Method, it is characterised in that：Optimal Sediment Dredging depth is calculated wherein in step 3 according to following formula.
H=max { hi} (1)
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H represents optimal dredging depth in formula；DoRepresent river bottom mud PAHs risk control level；D(hi) represent ecological risk
(D) method is determined to the river bottom mud environment-friendly dredging depth of polycyclic aromatic hydrocarbon ecological risk, the river course depth (h answeredi)；ε is represented
One infinitesimal arithmetic number；hiRepresent to meet for i-th the bed mud depth of formula (3), by DoValue is 0.1, i.e., by ecological risk
Control is in middle hypotoxicity.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110726684A (en) * | 2019-10-22 | 2020-01-24 | 中国计量大学 | Method for determining dredging depth of river sediment based on polycyclic aromatic hydrocarbon and heavy metal pollution |
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| CN101266235A (en) * | 2008-04-03 | 2008-09-17 | 中国科学院南京地理与湖泊研究所 | Polluted water body deposit environment-friendly dredging depth determination method |
| CN101713774A (en) * | 2009-12-04 | 2010-05-26 | 南京大学 | Method for identifying ecological risks of pesticides in water body |
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2017
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Patent Citations (4)
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| CN101266235A (en) * | 2008-04-03 | 2008-09-17 | 中国科学院南京地理与湖泊研究所 | Polluted water body deposit environment-friendly dredging depth determination method |
| CN101713774A (en) * | 2009-12-04 | 2010-05-26 | 南京大学 | Method for identifying ecological risks of pesticides in water body |
| CN103645286A (en) * | 2013-12-24 | 2014-03-19 | 江苏省环境科学研究院 | Determination method for ecological risks of polycyclic aromatic hydrocarbon in water body |
| CN103853931A (en) * | 2014-03-25 | 2014-06-11 | 国家海洋环境监测中心 | Ecological risk assessment method of polycyclic aromatic hydrocarbon compound and mixture thereof in marine water environment |
Non-Patent Citations (3)
| Title |
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| MCCREADY S: "The Distribution of Polycyclic Aromatic Hydrocar bonsin Surficial Sediments of Sydney Harbour, Australia", 《MARINE POLLUTION BULLETIN》 * |
| 武建军: "太湖北部多环芳烃的分布特征及来源解析", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》 * |
| 陈卫锋: "闽江福州段沉积物中多环芳烃的分布、来源及其生态风险研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110726684A (en) * | 2019-10-22 | 2020-01-24 | 中国计量大学 | Method for determining dredging depth of river sediment based on polycyclic aromatic hydrocarbon and heavy metal pollution |
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