CN110258439A - A kind of combined pollutant multiple target environmental dredging method based on 4R theory - Google Patents
A kind of combined pollutant multiple target environmental dredging method based on 4R theory Download PDFInfo
- Publication number
- CN110258439A CN110258439A CN201910468887.XA CN201910468887A CN110258439A CN 110258439 A CN110258439 A CN 110258439A CN 201910468887 A CN201910468887 A CN 201910468887A CN 110258439 A CN110258439 A CN 110258439A
- Authority
- CN
- China
- Prior art keywords
- dredging
- bed mud
- depth
- water
- sample
- 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.)
- Granted
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B1/00—Equipment or apparatus for, or methods of, general hydraulic engineering, e.g. protection of constructions against ice-strains
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/02—Stream regulation, e.g. breaking up subaqueous rock, cleaning the beds of waterways, directing the water flow
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/02—Stream regulation, e.g. breaking up subaqueous rock, cleaning the beds of waterways, directing the water flow
- E02B3/023—Removing sediments
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention patent discloses a kind of combined pollution bed mud multiple target environmental dredging method based on 4R theory, for river, pollution source is complicated in lake, the diversified bed mud of pollutant, the release (Release) of pollutant in the bed mud of comprehensive assessment dredging front and back, the ecological risk (Risk) of noxious pollutant, the settling flux (Resuspension) and dredging residue (Residual) of bed mud and pollutant in Dredging Process, it is proposed the precise dredging depth for more pollution target comprehensively controls, dredge range and dredging mode, environmental dredging can be obviously improved to the control effect of endogenous pollution of substrate sludge, number is dredged in reduction repeatedly, promote environmental dredging benefits of environment and economy.
Description
Technical field
The invention belongs to field of environment protection, are related to a kind of combined pollution bed mud multiple target environmental dredging based on 4R theory
Method.
Background technique
Sediment dredging technology is widely used in the water pollutions such as river, lake bed mud since the 1960s
In improvement, since it can be by each pollutant being enriched in bed mud quickly, directly remove, worldwide multiple pollution rivers
It is applied in the improvement of the water bodys such as stream, lake.However, Sediment Dredging is but constantly subjected to many strive to the regulation effect of pollution
View, the reason is that interference of the effect of Sediment Dredging by many factors:
First is that not comprehensive enough to bed mud combined pollution state understanding, polluter ecological risk (Risk) appraisal is not
It is enough.Each pollutant due to bed mud accepted long term from pollution sources such as industry, agricultural, lives, what is be usually subject to is a variety of dirts
The combined pollution of object is contaminated, mainly includes nutritive salt, heavy metal and persistence organic pollutant (persistent organic
Pollutants, POPs) etc., the comprehensive function of multiple pollutant matter makes bed mud show complicated pollution situation.Wherein, it seeks
Feeding salt mainly includes the nutriments such as nitrogen, phosphorus, is the major pollutants for causing water eutrophication.Nitrogen, phosphorus are blue in water body
The main limiting factor of the phytoplankton growths such as algae, the release of endogenous nitrogen, phosphorus after long-term accumulated is that aggravation water body is rich in bed mud
The one of the major reasons of nutrient laden, many eutrophication waters face serious endogenous nitrogen, phosphorus load problem.Heavy metal classes pollution
It is poisonous and harmful that object generally includes arsenic (As), cadmium (Cd), chromium (Cr), copper (Cu), mercury (Hg), nickel (Ni), lead (Pb) and zinc (Zn) etc.
Metal and metalloid.In the water bodys such as river, lake, bed mud is usually the main junction of heavy metal, the weight accumulated in bed mud
Metal can enter food chain by the utilization of zoobenthos, and then threaten aquatic ecosystem and human health.In addition, in bed mud
Preservation heavy metal can under certain conditions (such as variation of wave disturbance, redox environment, operation at sea, shipping) to
Overlying water discharges or with particle shape settling flux into overlying water, threatens hydro-ecological safety.Persistence organic pollutant master
It to include multiring aromatic hydrocarbon (polycyclic aromatic hydrocarbons, PAHs), organochlorine class
(organochlorine pesticides, OCPs) and polychlorinated biphenyl (polychlorinated biphenyls,
The pollutants such as PCBs), herbicide, agrochemical pesticide be excessively used and industrial production is the main source approach of POPs,
These POPs can enter food by benthon by the POPs that the processes such as absorption, sedimentation enter in bed mud after entering water body
It in chain, is enriched with, migrated and converted in aquatile body, there is biological amplification.A variety of POPs substances are combined
United Nations Environment Programme (UNEP), state is classified as the hazardous contaminant that must be disposed immediately.Current dredging work spininess to Single Pollution target,
Bed mud combined pollution is considered insufficient.
Second is that in Dredging Process polluted bed mud settling flux (Resuspension), i.e. dredging work disturbs so that loose
Polluted bed mud is suspended, is diffused in water body.Sediment characteristies, dredging water environment feature and dredging operation itself may cause bottom
The settling flux of mud should carry out probe to dredged area and bed mud before dredging work progress, determine in what manner into
Row dredging.
Third is that after dredging newborn water sludge interface pollutant release (Release), lead to the original that pollutant discharges after dredging
It is on the other hand that dredging quality is not achieved and wants because being on the one hand to judge the pollution of combined pollution bed mud and dredging depth unreasonable
It asks.In addition, after Sediment Dredging different release characteristics will be presented in different polluters, as in bed mud ammonia nitrogen after dredging 4
In~6 months, release iron may rise, and phosphate is then usually under suitable dredging depth, stop immediately release or
Release iron reduces rapidly.Attention is not yet received in current environmental dredging engineering in this phenomenon, should carry out before dredging in detail
Thin investigation determines best dredging depth.
Fourth is that generated residue (Residual) in Dredging Process, these residues be usually pollution of surface degree compared with
It is high, moisture content is relatively high, the lesser bed mud of partial size, the pollution of these residues is high, is an important factor for influencing dredging quality.
It is to influence dredging to the principal element of endogenous pollution of substrate sludge removal, control effect above, these factors cause to dredge
Engineering is constantly subjected to many disputes for a long time, and the assessment and solution of these factors will have environmental dredging engineering effort important
Meaning should be investigated in detail, assessed, be analyzed before dredging work carries out, to determine the need for carrying out dredging and such as
What is dredged.However, existing Sediment Dredging technology pays close attention to the improvement, research and development and operation (CN of dredging plant more
2016100747678,207,452,977 207,211,233 104005441 B etc. of U, CN of U, CN of CN) or dredging silt disposition
Work (CN 106082903 B, CN 102229485 B etc.), portion of techniques is considered to the dirts such as heavy metal, nutritive salt in bed mud
The dredging method (101962961 B of CN) of object is contaminated, however, every dredging the relevant technologies are not commented in bed mud combined pollution at present
It is residual for the settling flux (Resuspension) of bed mud in dredging work, pollutant release (Release), pollution on the basis of estimating
It stays object (Residual), ecological risk (Risk) to carry out the assessment and analysis of system, it is endogenous to bed mud to thereby result in environmental dredging
The control effect of pollution is not ideal enough and is queried in many ways.
Summary of the invention
In view of dispute suffered by defect present in existing Sediment Dredging technology and dredging work effect, the present invention is directed to
There is provided a kind of combined pollution bed mud multiple target environmental dredging method based on 4R theory, it is intended to bed mud combined pollutant situation point
Based on analysis assessment, by the 4R (Release, Risk, Resuspension, Residual) for establishing combined pollution Sediment Dredging
Evaluation system, it is intended to for river, lake pollution source complexity, the diversified bed mud of pollutant, comprehensive assessment dredging front and back bottom
Bed mud and pollutant during the release (Release) of pollutant, the ecological risk (Risk) of harmful substance, Sediment Dredging in mud
Settling flux (Resuspension) and dredging residue (Residual), propose the precise dredging sides for more pollution target controls
Law system, solve economy caused by dredging effect during endogenous pollution regulation is difficult to reach target and dredges repeatedly and
Environmental benefit loss.
In order to solve the above technical problems, the invention adopts the following technical scheme: a kind of combined pollution based on 4R theory
Bed mud multiple target environmental dredging method, it is characterised in that:
(1) firstly, the evaluation system of the bed mud combined pollution situation based on multiple target of foundation, the evaluation system include:
The release of the Nitrogen In Sediment, phosphor contaminant of different depth is assessed, and logical according to the release of nitrogen and phosphorus pollution object
It measures and determines dredging depth D1；
The black and odorous water risk induced respectively bed mud heavy metal, persistence organic pollutant ecological risk and bed mud is commented
Estimate, and is determined dredge according to the ecological risk that bed mud heavy metal, persistence organic pollutant and bed mud induce black and odorous water respectively
Dredge depth D2, D3 and D4；
Then, according to D=Max (D1, D2, D3, D4) is passed through, so that it is determined that final dredging depth D；
(2) then with dredging point for the center of circle, to instantaneous particle content m in surrounding water body interval sampling analysis water, and pass through
Following formula determines sediments re-suspension amount Rs after dredging,
Rs=m/M
In formula, M is total dredging amount；
As Rs > 1%, Sediments are dredged using suction type dredging method is twisted；
(3) water body after being dredged acquires column bed mud sample to surrounding bed mud interval again with dredging point for the center of circle, and
Capacity, water content and the TOC of column bed mud sample are analyzed, and before dredging compared with same depth bed mud,
When comparison result error is within 10%, then it is assumed that be dredging residue, no longer need to be handled；
When comparison result error is greater than 10%, and ratio R e < 2% of the total dredging amount of the capacity of column bed mud sample and bed mud
When, still it is considered to dredge residue, no longer needs to be handled；
When comparison result error is greater than 10%, and ratio R e > 2% of the total dredging amount of the capacity of column bed mud sample and bed mud
When, supplement dredging need to be carried out.
Further, the determination method of the release iron of bed mud nitrogen and phosphorus pollution object is as follows in step (1):
After the column bed mud sample overlying water of in-situ acquisition is pumped, according to simulated sediment dredging at equal intervals until bed mud mud
Following depth is at d1, then along the undisturbed water sample that in-situ acquisition is added of the remaining bed mud column sample side wall of simulated sediment dredging, water
Sample depth is that d2 takes overlying water sample at 0,12,24,36,48, the 60 and 72h moment respectively more than water bath with thermostatic control culture 72h,
Same amount of water sample in situ is supplemented after water intaking, then calculates substrate sludge nitrogen, phosphorus release iron by following formula:
In formula: r is nitrogen & phosphorus release flux, and dimension is mg/ (m2·d)；V is bed mud in nitrogen & phosphorus release flux acquisition process
Overlying water total volume in column sample, dimension L；Cn、C0And Cj-1Respectively n-th, initial and j-1 sampling when overlying water in nitrogen,
The concentration of phosphorus, dimension mg/L；CaFor the concentration of nitrogen, phosphorus in the raw water sample of addition, dimension mg/L；Vj-1It is sampled for jth -1 time
Volume (50mL), dimension L；A is the area of water sludge interface in bed mud column sample, dimension m2；T be release experiment carry out when
Between, dimension d；
Until the correspondence depth of data is at d1, and dredging depth bottom nitrogen, phosphorus are no longer released into overlying water when r < 0
It puts, it is final to determine that dredging depth is D1, and D1 >=d1.
Further, the substrate sludge nitrogen, phosphor contaminant release iron determine in method that column bed mud sample is dredged the bottom of to
Mud sludge layer following depth d1 is 20cm, and the water sample depth of addition is also 20cm；Column bed mud sample is in dredging according to every 5cm
Spaced simulation dredging.
Further, bed mud Heavy Metal Ecological risk described in step (1) is determined by following formula,
Wherein, RI indicates heavy metal potential ecological risk index；For the Toxic Response Factor of metal i, As, Cd, Cr,
Cu, Hg, Ni, Pb and Zn are respectively 10,30,2,5,40,5,5 and 1；CiThe measured concentration of metal i；Background for metal i contains
Amount；
As RI < 135, indicate that bed mud Heavy Metal Ecological risk is low；
As 135≤RI < 265, indicate that there are medium ecological risks for bed mud heavy metal；
As 265≤RI < 525, bed mud heavy metal is indicated there are severe ecological risk, determination carries out the regulation such as dredging
Work；
As RI >=525, indicate that there are serious ecological risks for bed mud heavy metal；
Using the depth D2 of bed mud when heavy metal potential ecological risk index RI >=265 as dredging depth.
Further, persistence organic pollutant ecological risk described in step (1) is using ecological exposure low value
(ERL)-ecology exposure intermediate value (ERM) method is assessed；When bed mud sample depth is the persistence organic pollutant at D3
When content > ERL value, determine that D3 is dredging depth.
Persistence organic pollutant urban eco landscape forest in the bed mud combined pollution appraisal procedure system, with above-mentioned acquisition
Background content be reference, use ecological exposure intermediate value (ERM) method (the Long et of ecological exposure low value (ERL)-
Al., Environmental management, 1995.19:81-97) assessment bed mud persistence organic pollutant ecological risk.
Preferably, persistence organic pollutant ecology exposure low value (ERL)-ecology exposure in the bed mud
Intermediate value (ERM) is (referring to Long et al., Environmental management, 1995.19:81-97) as shown in the table:
Further, the black and odorous water risk assessment that bed mud described in step (1) induces, with volatile sour in bed mud
Sulphur (AVS) content and porosity as judge index,
In bed mud more than depth D4, when AVS > 31.9mg/kg, porosity > 0.60, exists and induce black and odorous water
Risk, it is determined that Sediment Dredging depth is >=D4.
Further, after dredging in step (2) during the determination of sediments re-suspension chain Rs, the sampling of water body is to dredge a little
For the center of circle, being sampled at equal intervals according to 10m in 500m radius.
Further, in step (3) after dredging in the evaluation process of Sediment Dredging residue, the acquisition of column bed mud sample with
Dredging point is the center of circle, being sampled at equal intervals according to 50m in 500m radius.
Further, the persistence organic pollutant is multiring aromatic hydrocarbon, organochlorine class or polychlorinated biphenyl.
Further, after dredging in step (3) in the evaluation process of Sediment Dredging residue, dredging residue control amount must be less than
The 2% of total dredging amount.
The utility model has the advantages that compared with the existing technology, the present invention has comprehensively considered before and after bed mud combined pollution situation, Sediment Dredging
The residual contamination bottom of bed mud caused by the release of pollutant and ecological risk, dredging work and pollutant settling flux and dredging work
Mud.On the one hand it can reach the maximization of contamination control effect for bed mud combined pollution situation, can be obviously improved to all kinds of in bed mud
The inhibition that pollutant discharges and the removal effect to all kinds of noxious pollutant risks, have important Significance for Environment；Another party
Face can substantially reduce for the problems such as sediment pollution after dredging discharges repeatedly, sediment pollution is replied again and dredge number repeatedly, right
It is lost in reducing the manpower and material resources as caused by a large amount of, dredging repeatedly, promotes environmental dredging and have to the control effect of water pollution
It is significant.
Detailed description of the invention
Fig. 1 is that Chaohu arm of lake dredging work investigated according to bed mud combined pollution appraisal procedure system implements preceding bottom
Mud fouling status schematic diagram；
Fig. 2 is the combined pollution bed mud multiple target environmental dredging method schematic diagram based on 4R theory；
Fig. 3 is the dredging control effect figure for black and odorous water that bed mud combined pollution appraisal procedure architectural study obtains；
Fig. 4 is that influence of the Sediment Dredging residue to internal loading after dredging is imitated in multiple target precise dredging method establishment system
Fruit figure；
Fig. 5 is Chaohu arm of lake after the combined pollution bed mud multiple target environmental dredging method based on 4R theory is dredged
Bed mud water-cut variation figure after dredging work is implemented；
Fig. 6 is the bed mud phosphate after the combined pollution bed mud multiple target environmental dredging method based on 4R theory is dredged
Release iron variation diagram；
Fig. 7 is that the bed mud ammonia nitrogen after the combined pollution bed mud multiple target environmental dredging method based on 4R theory is dredged is released
Put variations of flux figure；
Fig. 8 is the bed mud heavy metal after the combined pollution bed mud multiple target environmental dredging method based on 4R theory is dredged
Content change diagram；
Fig. 9 is the bed mud persistence after the combined pollution bed mud multiple target environmental dredging method based on 4R theory is dredged
Organic pollutant content change diagram；
In Fig. 2,1 is water sludge interface, and 2 control dredging circle that must reach based on pollutant release ecological risk (Risk in figure)
Face, 3 be that the dredging interface that must reach is controlled based on long property organic pollutant ecology exposure, and 4 be based on black and odorous water risk
The dredging interface that must reach is controlled, 5 be that the dredging interface that must reach is controlled based on heavy metal potential information requirement, and 6 be based on dirt
Contaminating object release needs dredging depth to be achieved, and 7 be to need dredging to be achieved based on persistence organic pollutant ecology exposure
Depth, 8 be that dredging depth to be achieved is needed based on black and odorous water risk control, and 9 are controlled based on heavy metal potential information requirement
Dredging depth to be achieved is needed, 10 be water body settling flux particulate matter (Resuspension) in Dredging Process), 11 be dredging work
Residue (Residual).
Specific embodiment
With reference to the accompanying drawing and with specific embodiment, the present invention is furture elucidated.It should be understood that these embodiments are only used for
It is bright the present invention rather than limit the scope of the invention, after the present invention has been read, those skilled in the art are to of the invention
The modification of various equivalent forms falls within the application range as defined in the appended claims.
Present invention specifically aims at pollution source complexity, the diversified bed mud of pollutant, comprehensive assessments in river, lake to dredge
Dredge the release (Release) of pollutant in the bed mud of front and back, the ecological risk (Risk) of noxious pollutant, in Dredging Process bed mud and
The settling flux (Resuspension) of pollutant and dredging residue (Residual) are proposed for more pollution target comprehensively controls
Precise dredging method, improve the environmental dredging efficiency and contamination control effect for combined pollution bed mud.
1) according to bed mud combined pollution appraisal procedure system, first acquisition target area and the check plot without dredging
Domain bed mud deposit depth distribution situation, exploration density are 100m × 100m, and specific fouling status is as shown in Figure 1, pollution in arm of lake
For bed mud deposit depth between 10~50cm, arm of lake central area deposit depth is maximum.
2) cylindrical sample is acquired on the basis of the siltation of above-mentioned polluted bed mud according to bed mud combined pollution appraisal procedure system,
For sample density in 500m × 500m, cylindrical sample depth reaches background layer 20cm depth, and maximum sampling depth reaches
70cm。
3) it according to bed mud combined pollution appraisal procedure system, investigates to obtain by simulated sediment dredging and be released for Nitrogen In Sediment, phosphorus
The dredging depth D1 (6 in Fig. 2) for putting inhibition is 15cm, must reach dredging interface 2.I.e. when dredging depth reaches 15cm, bed mud
Middle nitrogen & phosphorus release flux is quickly down to 0 hereinafter, the release of Nitrogen In Sediment, phosphorus to overlying water can be effectively suppressed after dredging.Its
In, the release inhibitory effect of ammonia nitrogen needs to can be only achieved after dredging 4 months in bed mud, i.e., ability after newborn water sludge interface is stablized
Reach inhibitory effect, this is related with conversion of the ammonia nitrogen under Redox Condition itself.And un-dredged control zone bed mud is then
It is always maintained at nitrogen & phosphorus release state.
3) it according to bed mud combined pollution appraisal procedure system, is assessed by potential ecological risk index method, in depth D2 (figure
When 9) reaching 30cm in 2, dredging interface 5 must be reached, poisonous and harmful heavy metallic potential ecological risk index RI is down to 265 in bed mud
Below.
4) according to bed mud combined pollution appraisal procedure system, pass through ecological exposure low value (ERL)-ecology exposure wind
Dangerous intermediate value (ERM) method assessment, when depth D3 (7 in Fig. 2) reaches 20cm, that is, reaches dredging interface 3, each persistence in bed mud
Organic pollutant content is down to ecological exposure low value or less.
5) it according to bed mud combined pollution appraisal procedure system, to simulate control experiment method, obtains when depth D4 is (in Fig. 2
8) reach 25cm, that is, when reaching dredging interface 4, AVS content can be reduced to 31.9mg/kg hereinafter, bed mud porosity can in bed mud
It is reduced to 60.5% or less.Under this dredging depth, S in water body2-Concentration significantly reduces (as shown in Figure 3), and water body does not occur black
It is smelly, and under other dredging depths water body have occurred it is black smelly.
6) precise dredging depth determination method in system, final dredging depth D are established according to multiple target precise dredging method
Are as follows: D=Max (D1, D2, D3, D4)=30cm.
7) system is established according to multiple target precise dredging method, has carried out 10000m in arm of lake using suction type dredging is twisted2's
Dredging demonstration, meanwhile, un-dredged control zone is provided with being separated by 1km with demonstration area.For dredging residue 2% or more
Region, find after study, bed mud flux is maintained at high-level (as shown in Figure 4) after dredging residue will lead to dredging, can not
Reach internal loading inhibitory effect.
8) dredged area moisture content is remarkably decreased and un-dredged control zone moisture content remains unchanged (as shown in Figure 5), is dredged
Dredge that area's aquatic particle content (10 in Fig. 2) is close with check plot, and sediments re-suspension is less than 1%.
9) by dredging residue (11 in Fig. 2) assessment, dredging level of residue is about 1%, has reached dredging residue requirement.
10) after dredging work is implemented, phosphate, which discharges, in bed mud is inhibited rapidly, effectively controls releasing for phosphorus in bed mud
(Fig. 6) is put, and un-dredged area's bed mud is then still in phosphorus release conditions.
11) after dredging work is implemented, dredged area bed mud ammonia nitrogen flux is higher at the end of dredging is rigid, 4 after dredging
It can just be effectively controlled (Fig. 7) within a month or so, un-dredged area's bed mud ammonia nitrogen flux is constantly in higher emission levels.
12) after dredging work is implemented, content of beary metal is significantly reduced in bed mud, and heavy metal potential information requirement is down to 265
(Fig. 8) below, un-dredged area's bed mud heavy metal potential information requirement are still higher.
13) after dredging work is implemented, persistence organic pollutant content is significantly reduced in bed mud, persistence organic pollutant
Content is reduced to ecological exposure low value hereinafter, ecological risk is under control (Fig. 9).
Claims (10)
1. a kind of combined pollution bed mud multiple target environmental dredging method based on 4R theory, it is characterised in that:
(1) firstly, the evaluation system of the bed mud combined pollution situation based on multiple target of foundation, the evaluation system include:
The release of the Nitrogen In Sediment, phosphor contaminant of different depth is assessed, and true according to the release iron of nitrogen and phosphorus pollution object
Determine dredging depth D1；
The black and odorous water risk assessment that bed mud heavy metal, persistence organic pollutant ecological risk and bed mud are induced respectively, and
Dredging depth is determined according to the ecological risk that bed mud heavy metal, persistence organic pollutant and bed mud induce black and odorous water respectively
D2, D3 and D4；
Then, according to D=Max (D1, D2, D3, D4) is passed through, so that it is determined that final dredging depth D；
(2) then with dredging point for the center of circle, to instantaneous particle content m in surrounding water body interval sampling analysis water, and pass through following formula
Determine sediments re-suspension amount Rs after dredging,
Rs=m/M
In formula, M is total dredging amount；
As Rs > 1%, Sediments are dredged using suction type dredging method is twisted；
(3) water body after being dredged acquires column bed mud sample to surrounding bed mud interval for the center of circle with dredging point again, and analyzes
Capacity, water content and the TOC of column bed mud sample, and before dredging compared with same depth bed mud,
When comparison result error is within 10%, then it is assumed that be dredging residue, no longer need to be handled；
When comparison result error is greater than 10%, and the capacity of column bed mud sample and bed mud always the ratio R e < 2% of dredging amount when,
Still it is considered to dredge residue, no longer needs to be handled；
When comparison result error is greater than 10%, and the capacity of column bed mud sample and bed mud always the ratio R e > 2% of dredging amount when,
It need to carry out supplement dredging.
2. the combined pollution bed mud multiple target environmental dredging method based on 4R theory according to claim 1, it is characterised in that:
The determination method of the release iron of bed mud nitrogen and phosphorus pollution object is as follows in step (1):
After the column bed mud sample overlying water of in-situ acquisition is pumped, according to simulated sediment dredging at equal intervals until below bed mud mud
Depth is at d1, and then along the undisturbed water sample that in-situ acquisition is added of the remaining bed mud column sample side wall of simulated sediment dredging, water sample is deep
Degree is that d2 takes overlying water sample at 0,12,24,36,48, the 60 and 72h moment respectively more than water bath with thermostatic control culture 72h, is fetched water
After supplement same amount of water sample in situ, then calculate substrate sludge nitrogen, phosphorus release iron by following formula:
In formula: r is nitrogen & phosphorus release flux, and dimension is mg/ (m2·d)；V is bed mud column sample in nitrogen & phosphorus release flux acquisition process
Middle overlying water total volume, dimension L；Cn、C0And Cj-1Respectively n-th, nitrogen in overlying water when initial and j-1 time samples, phosphorus
Concentration, dimension mg/L；CaFor the concentration of nitrogen, phosphorus in the raw water sample of addition, dimension mg/L；Vj-1For -1 sampling volume of jth
(50mL), dimension L；A is the area of water sludge interface in bed mud column sample, dimension m2；T is the time that release experiment carries out, amount
Guiding principle is d；
Until the correspondence depth of data is at d1, and dredging depth bottom nitrogen, phosphorus are no longer discharged into overlying water, most when r < 0
Determine that dredging depth is D1, and D1 >=d1 eventually.
3. the combined pollution bed mud multiple target environmental dredging method based on 4R theory according to claim 2, it is characterised in that:
The substrate sludge nitrogen, phosphor contaminant release iron determine in method that column bed mud sample is dredged to bed mud mud following depth
D1 is 20cm, and the water sample depth of addition is also 20cm；Column bed mud sample is dredged in dredging according to every 5cm spaced simulation.
4. the combined pollution bed mud multiple target environmental dredging method based on 4R theory according to claim 1, it is characterised in that:
Bed mud Heavy Metal Ecological risk described in step (1) is determining by following formula,
Wherein, RI indicates heavy metal potential ecological risk index；For the Toxic Response Factor of metal i, As, Cd, Cr, Cu, Hg,
Ni, Pb and Zn are respectively 10,30,2,5,40,5,5 and 1；CiThe measured concentration of metal i；For the background content of metal i；
As RI < 135, indicate that bed mud Heavy Metal Ecological risk is low；
As 135≤RI < 265, indicate that there are medium ecological risks for bed mud heavy metal；
As 265≤RI < 525, indicate that bed mud heavy metal there are severe ecological risk, determines and dredge etc. regulation work
Make；
As RI >=525, indicate that there are serious ecological risks for bed mud heavy metal；
Using the depth D2 of bed mud when heavy metal potential ecological risk index RI >=265 as dredging depth.
5. the combined pollution bed mud multiple target environmental dredging method based on 4R theory according to claim 1, it is characterised in that:
Persistence organic pollutant ecological risk described in step (1) is using the ecological exposure of ecological exposure low value (ERL)-
Intermediate value (ERM) method is assessed；
When bed mud sample depth is the persistence organic pollutant content > ERL value at the place D3, determine D3 for dredging depth.
6. the combined pollution bed mud multiple target environmental dredging method based on 4R theory according to claim 1, it is characterised in that:
The black and odorous water risk assessment that bed mud described in step (1) induces, with (AVS) content of acid volatile sulfide in bed mud and hole
Rate as judge index,
In bed mud more than depth D4, when AVS > 31.9mg/kg, porosity > 0.60, there is the wind for inducing black and odorous water
Danger, it is determined that Sediment Dredging depth is >=D4.
7. the combined pollution bed mud multiple target environmental dredging method based on 4R theory according to claim 1, it is characterised in that:
In step (2) after dredging during the determination of sediments re-suspension chain Rs, the sampling of water body is to dredge a little for the center of circle, in 500m radius
Interior being sampled at equal intervals according to 10m.
8. the combined pollution bed mud multiple target environmental dredging method based on 4R theory according to claim 1, it is characterised in that:
In step (3) after dredging in the evaluation process of Sediment Dredging residue, the acquisition of column bed mud sample to dredge a little for the center of circle,
Being sampled at equal intervals according to 50m in 500m radius.
9. the combined pollution bed mud multiple target environmental dredging method based on 4R theory according to claim 5, it is characterised in that:
The persistence organic pollutant is multiring aromatic hydrocarbon, organochlorine class or polychlorinated biphenyl.
10. the combined pollution bed mud multiple target environmental dredging method based on 4R theory, feature exist according to claim 1
In: in step (3) after dredging in the evaluation process of Sediment Dredging residue, dredging residue control amount must be less than the 2% of total dredging amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910468887.XA CN110258439B (en) | 2019-05-31 | 2019-05-31 | Multi-target environment-friendly dredging method for composite pollutants based on 4R theory |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910468887.XA CN110258439B (en) | 2019-05-31 | 2019-05-31 | Multi-target environment-friendly dredging method for composite pollutants based on 4R theory |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110258439A true CN110258439A (en) | 2019-09-20 |
| CN110258439B CN110258439B (en) | 2021-03-16 |
Family
ID=67916264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910468887.XA Active CN110258439B (en) | 2019-05-31 | 2019-05-31 | Multi-target environment-friendly dredging method for composite pollutants based on 4R theory |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110258439B (en) |
Cited By (3)
| 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 |
| CN113486288A (en) * | 2021-06-30 | 2021-10-08 | 中国科学院生态环境研究中心 | Method for determining ecological dredging depth of sediment |
| CN113504352A (en) * | 2021-06-09 | 2021-10-15 | 水利部交通运输部国家能源局南京水利科学研究院 | Method for determining dredging depth and engineering quantity of ecological dredging engineering |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102677626A (en) * | 2012-05-15 | 2012-09-19 | 临沂大学 | Method for constructing comprehensive control system for small-watershed surface source pollution |
| CN102831328A (en) * | 2012-09-13 | 2012-12-19 | 中国环境科学研究院 | Method for determining environmental-protection dredging range based on water pollution bottom mud identification and evaluation |
| CN107938737A (en) * | 2017-11-15 | 2018-04-20 | 中交天津港航勘察设计研究院有限公司 | A kind of dystrophication sediment dredging cures disposal continuous treatment method |
-
2019
- 2019-05-31 CN CN201910468887.XA patent/CN110258439B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102677626A (en) * | 2012-05-15 | 2012-09-19 | 临沂大学 | Method for constructing comprehensive control system for small-watershed surface source pollution |
| CN102831328A (en) * | 2012-09-13 | 2012-12-19 | 中国环境科学研究院 | Method for determining environmental-protection dredging range based on water pollution bottom mud identification and evaluation |
| CN107938737A (en) * | 2017-11-15 | 2018-04-20 | 中交天津港航勘察设计研究院有限公司 | A kind of dystrophication sediment dredging cures disposal continuous treatment method |
Cited By (5)
| 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 |
| CN113504352A (en) * | 2021-06-09 | 2021-10-15 | 水利部交通运输部国家能源局南京水利科学研究院 | Method for determining dredging depth and engineering quantity of ecological dredging engineering |
| CN113504352B (en) * | 2021-06-09 | 2024-02-09 | 水利部交通运输部国家能源局南京水利科学研究院 | Method for determining dredging depth and engineering quantity of ecological dredging engineering |
| CN113486288A (en) * | 2021-06-30 | 2021-10-08 | 中国科学院生态环境研究中心 | Method for determining ecological dredging depth of sediment |
| CN113486288B (en) * | 2021-06-30 | 2024-02-02 | 中国科学院生态环境研究中心 | Method for determining ecological dredging depth of sediment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110258439B (en) | 2021-03-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Burton | Sediment toxicity assessment | |
| Baudo et al. | Lesser known in-place pollutants and diffuse source problems | |
| Burton | Sediment collection and processing: factors affecting realism | |
| Kalnejais et al. | The release of dissolved nutrients and metals from coastal sediments due to resuspension | |
| Ye et al. | Distribution of heavy metals in sediments of the Pearl River Estuary, Southern China: implications for sources and historical changes | |
| Ouyang et al. | Characterization and spatial distribution of heavy metals in sediment from Cedar and Ortega rivers subbasin | |
| Papageorgiou et al. | Effects of fish farming on the biological and geochemical properties of muddy and sandy sediments in the Mediterranean Sea | |
| Burton | Metal bioavailability and toxicity in sediments | |
| Zhuang et al. | Assessment of heavy metal impact on sediment quality of the Xiaoqinghe estuary in the coastal Laizhou Bay, Bohai Sea: Inconsistency between two commonly used criteria | |
| Santos-Echeandia et al. | Porewater geochemistry in a Galician Ria (NW Iberian Peninsula): implications for benthic fluxes of dissolved trace elements (Co, Cu, Ni, Pb, V, Zn) | |
| Yu et al. | Effects of sediment dredging on nitrogen cycling in Lake Taihu, China: insight from mass balance based on a 2-year field study | |
| Buyang et al. | Distribution and adsorption of metals on different particle size fractions of sediments in a hydrodynamically disturbed canal | |
| CN110258439A (en) | A kind of combined pollutant multiple target environmental dredging method based on 4R theory | |
| Siregar et al. | Heavy metal contamination in water, sediments and Planiliza subviridis tissue in the Donan River, Indonesia | |
| Liu et al. | In situ high-resolution two-dimensional profiles of redox sensitive metal mobility in sediment-water interface and porewater from estuarine sediments | |
| Knox et al. | Effect of bioturbation on contaminated sediment deposited over remediated sediment | |
| Balakrishnan et al. | Distribution and seasonal variation of heavy metals in sediments of Muthupet lagoon, southeast coast of India | |
| Leivuori et al. | Distribution of heavy metals in sediments of the Gulf of Riga, Baltic Sea | |
| Rezaie-Boroon et al. | The geochemistry of heavy metals in the mudflat of Salinas de San Pedro Lagoon, California, USA | |
| Barik et al. | Bioavailability of metals in coastal lagoon sediments and their influence on benthic foraminifera | |
| Bach et al. | Environmental impact of submarine rock blasting and dredging operations in an Arctic harbor area: dispersal and bioavailability of sediment-associated heavy metals | |
| Garrison et al. | Sediment oxygen demand and benthic foraminiferal faunas in the Arabian Gulf: A test of the method on a siliciclastic substrate | |
| Bu-Olayan et al. | Trace metal concentrations in the crab Macrophthalmus depressus and sediments on the Kuwait coast | |
| Davidson et al. | Trace elements in sediments of an aging reservoir in rural Mississippi: Potential for mobilization following dredging | |
| Safari Sinegani et al. | Chemical fractionation and bioavailability of Fe, Mn, Pb, and Cd in soils around Meyghan Lake, Arak, Iran |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: No.73, East Beijing Road, Nanjing, Jiangsu 210000 Patentee after: Nanjing Institute of Geography & Limnology, Chinese Academy of Sciences Patentee after: Nanjing Guoxing Environmental Protection Industry Research Institute Co.,Ltd. Address before: 210000 room 801-822, block B, Chuangzhi building, 17 Xinghuo Road, Jiangbei new district, Nanjing City, Jiangsu Province Patentee before: Nanjing Guoxing Environmental Protection Industry Research Institute Co.,Ltd. Patentee before: Nanjing Institute of Geography & Limnology, Chinese Academy of Sciences |