CN104815844A - Chromium contamination in-situ remediation method - Google Patents
Chromium contamination in-situ remediation method Download PDFInfo
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Abstract
The present invention discloses a chromium contamination in-situ remediation method, which comprises: 1) injection points are arranged and the dosage of a repair agent is determined, wherein it is ensured that the repair agent covers all the place to be repaired; 2) the repair agent is prepared; 3) a drilling system is provided with depth fixation equipment for positioning the injection points; and 4) the repair agent is subjected to high pressure injection. The in-situ remediation system suitable for the remediation method comprises the drilling system for supporting the operation and the agent mixing and injection system. According to the present invention, the large-scale infrastructure investment and building is not required, the stratum structure is not basically destroyed, the stratum condition does not affect the high pressure injection, the repair agent is uniformly distributed in the formed fracture cracks and provides advantages of targeting property, good repair effect, complete repair, and no bounce for the chromium contamination, the starting and the stopping can be performed at any time, the continuous large-scale construction can be achieved, and the engineering applications can be achieved.
Description
Technical field
The invention belongs to pollution of chromium processing technology field, the in-situ remediation method of particularly a kind of pollution of chromium, be applicable to the pollution of chromium reparation of saturated aquifer soil and groundwater.
Background technology
From last century five, the sixties, China's chromium salt production industry produces a large amount of chromium slag, and according to statistics, by the end of 2005, history is stored up the chromium quantity of slag and reached more than 400 ten thousand tons, and has mostly only done simple protection.Under the eluviation of long term atmospheric precipitation, Cr (VI) diffusate is downward migration stain soil and groundwater gradually.In addition, at dyeing, leather industry and electroplating industry, contaminated soil and underground water are understood in the unordered discharge of industrial wastewater equally.In underground environment, Cr (VI) exists mainly with the anionic form such as chromate, dichromate ion greatly, is not easy to be adsorbed, and along with underground water migration, pollution range can be expanded gradually, bring larger environmental risk.
The technology of existing process Cr (VI) polluted underground water mainly contains excavation post processing, Pump-and-Treat, Injection Well original position injection process and permeable reactive barrier technology.These technology are at treatment effect, and the construction aspect such as feasibility, economic rationality still exists larger room for improvement.The concrete analysis of its technology pluses and minuses is as follows.
(1) post processing is excavated: all excavated by Polluted area, expose underground water, industry is called foundation ditch water, after foundation ditch water is retracted to surface water treatment facility, focuses on, qualified discharge.The method needs to build complete water processing establishment on earth's surface, and capital cost is high, long construction period, and operation and maintenance cost is high, and the water after process needs to be discharged in other water body, may bring new environmental problem.The method is excavated soil on a large scale because of needs, and soil texture is destroyed, and foundation bearing capacity cannot recover completely, has the risk that sedimentation occurs, there is certain potential safety hazard to follow-up redevelopment utilization after backfill.
(2) Pump-and-Treat: build a series of out well, Injection Well, extracts out the underground water of pollution and enters surface water treatment facility, focusing on, recharge underground after process.The method needs to build complete water processing establishment, there is capital cost equally high, long construction period, the problem that operation and maintenance cost is high.In addition, groundwater recharge has difficulties equally, and owing to recharging speed much smaller than extraction speed, construction period extends greatly.Pump-and-Treat is at successful in early stage, namely pollutant is reduced to low concentration from higher concentration, but the concentration reducing pollutant further just seems more difficult, even if reparation target can be reached within a certain period of time, still may there is the phenomenon that pollutant levels are gone up after leaving standstill, be called " smearing ".
(3) Injection Well original position is injected: need to build a large amount of Injection Well, capital cost is high, long construction period, after having constructed, can remain Injection Well, affect follow-up redevelopment and utilize in reparation plot.Injection process adopts natural flow or low pressure to inject, and formation condition is very large to injection influential effect, and as run into argillic horizon or formation properties heterogeneity, medicament cannot evenly spread, and affects repairing effect and even cannot complete reparation.
(4) permeable reactive barrier: build permeable reaction wall on Groundwater Flow direction, fill active filler in body of wall, the subsurface flow of pollution is after body of wall, and Cr (VI) and active filler are reacted, and reach the object of stabilisation.The problem of the method is that Groundwater Flow is comparatively slow, and when site area is larger, the processing time is longer.Can produce passivation layer after active filler uses a period of time, treatment effect declines, and needs to change filler.After underground water pollutant process completes, the pollutant be adsorbed in soil can be discharged in underground water again, and repairing efficiency is extended further.
For solving the realistic problem of pollution of chromium, have the technical scheme that many sections patent discloses its this problem.Such as, patent CN203061547U discloses a kind of pollution of chromium place comprehensive repair system.This system is a kind of Pump-and-Treat-recharge repair system.Flusher is located at above place to be repaired, sprays and repairs medicament.Utilize groundwater extraction well that the underground water of pollution is carried out Pump-and-Treat, the water after up to standard can recharge and also can utilize as the recycle-water secondary of flusher.This cover system can process soil and groundwater simultaneously and pollute, and chromium pollutant curing/stabilizing rate reaches more than 99%.This patent requirements strictly controls ground water field, makes the underground water of pollution by the design flow direction, flow rate, otherwise easily makes pollution clouds spread, cause wider pollution.Its flusher is better at process initial performances, but along with the operation of system, can form precipitation, porosity of soil is declined, spraying efficiency reduction after chromium pollutant stabilisation.
Moreover, patent CN202688016U discloses a kind of underground water in-situ repairing device, comprising two rows along direction of groundwater flow is the cut-pff wall that funnel-form is arranged, wide end between two row's cut-pff walls and narrow end are laterally provided with row's permeable reactive barrier respectively, permeable reactive barrier is arranged by several antiseepage stakes and permeable filling well successively interval and forms, pollutant with in Groundwater Flow process by after the filler of permeable reactive barrier, can stabilisation be obtained.This device can range permeable reactive barrier technology, can reach to underground water pollution among a small circle the object that the diffusion of preventing pollution thing can repair again pollution, but cannot repair completely the pollutions in the middle of two row's permeable reactive barriers.To underground water pollution on a large scale, because groundwater velocity is comparatively slow, repair time extends greatly.And to high density pollution, need repeatedly to change permeable reactive barrier filler, rehabilitation cost increases, difficulty of construction increases.
Further, patent CN103232096A discloses a kind of in-situ remediation system and restorative procedure of sustainable removal pollution of chromium.Fill chromium pollutant stabilisation filler within the walls at permeable reactive, this filler is after work a period of time passivation, and the electrode by outer company activates, stripping passivation layer, and filler can be continued to play stably the object of chromium pollutant.This cover system belongs to the permeable reactive wall technology that can activate, to the chromium pollutant flowing through infiltration wall, there is good stabilization effect, but mainly rely on Groundwater Flow, passive process chromium pollutant, long processing period, and not thorough to pollutant process, the pollutant be adsorbed on soil can be discharged in underground water again, extends treatment cycle further.
Summary of the invention
In order to solve the defect of existing pollution of chromium Treatment process, the object of the present invention is to provide a kind of in-situ remediation method of pollution of chromium.This in-situ remediation method is by means of a kind of integrated system; avoid investing to build of the high large-scale basis facility of price; substantially earth formation is not destroyed; high pressure mode is adopted to inject reparation medicament; by the impact of formation condition, to pollution of chromium reparation more targetedly, repairing effect is good, repair and thoroughly do not rebound, can start and stop at any time; can construct on a large scale continuously again, be beneficial to through engineering approaches application.
To achieve these goals, present invention employs a kind of in-situ remediation method of pollution of chromium, the pollution of chromium can carrying out saturated aquifer soil or underground water is in accordance with the following steps administered.
Step one, arranges decanting point and determines to repair pharmaceutical quantities
Repair medicament and inject zone of saturation at decanting point, the permeation effects scope of repairing medicament is a cylinder, and cylinder radius is the radius of influence of decanting point; The computing formula of single decanting point area coverage is:
S＝π·R
2(1)
In formula (1), S represents decanting point area coverage; R represents the radius of influence of decanting point;
For ensureing that repairing medicament covers all places to be repaired, should have suitable overlap joint ratio between adjacent decanting point, according to the area coverage of single decanting point, the decanting point designing place to be repaired is arranged, each decanting point area coverage is connected, and need cover place to be repaired completely; The computing formula of place to be repaired decanting point total quantity is:
In formula (2), N represents place to be repaired decanting point total quantity; A represents that place to be repaired pressure break is injected and repairs the gross area; δ represents overlap joint ratio, i.e. the area of adjacent decanting point overlap and the ratio of decanting point area coverage S;
The required computing formula of repairing pharmaceutical quantities in place to be repaired is:
M＝κ·m (3)
In formula (3), M represents that place to be repaired is required and repairs pharmaceutical quantities; κ represent repair medicament add ratio; M represents place to be repaired groundwater quality;
Step 2, medicament is repaired in preparation
Reparation medicament is placed in medicament and injects bucket, add appropriate solvent, Keep agitation is until reparation medicament mixes with solvent;
Step 3, decanting point is located
Start drilling system, drilling rod is crept into downwards by decanting point center, and drilling system has depthkeeping equipment, can observe the drilling depth of drilling rod front end at any time, after drilling rod front end arrives zone of saturation, closes down drilling system, disconnects the connection of drilling rod and drilling system;
Step 4, repairs medicament and injects
To repair drug delivery pipe to be connected with drilling rod, and start grouting pump, inject in zone of saturation and repair medicament, repair medicament process in injection, the actual injection rate of accurate recording, closes down grouting pump after reaching the injection rate of design.
Described reparation medicament can select calcium polysulfide, ferrous sulfate, frerrous chloride, iron ammonium sulfate, sodium sulfite, sodium pyrosulfite or vulcanized sodium.
The in-situ remediation method of pollution of chromium of the present invention also comprises further, and in described step 4, grouting pump provides the pressure of high-voltage pulse to be 0.5 ~ 18Mpa.
The in-situ remediation method of pollution of chromium of the present invention also comprises further, after medicament to be repaired has injected, need to drill through undisturbed soil sample the radius of influence of decanting point is inside and outside, check pressure break crack quantity, check and approve the actual influence radius repairing medicament whether to produce a desired effect, and with actual influence radius for benchmark, redefine decanting point position and decanting point quantity.
As in-situ remediation method preferred of pollution of chromium, when its step one is determined to repair pharmaceutical quantities, reparation place is divided into some reparation districts by the difference of pollution concentration, each is repaired district's adding of agent and determines than according to pollution concentration, calculate the reparation pharmaceutical quantities in each reparation district respectively, each reparation pharmaceutical quantities of repairing district add and after be required reparation pharmaceutical quantities.
In the in-situ remediation method of described pollution of chromium, the range of choice of the radius of influence R of decanting point is 0.9 ~ 5.0 meter, and overlapping than the range of choice of δ is 0 ~ 13%.
Further, in the in-situ remediation method of described pollution of chromium, the range of choice of the radius of influence R of decanting point is 1.0 ~ 3.0 meters, and overlapping than the range of choice of δ is 5 ~ 10%.
Further, in the in-situ remediation method of described pollution of chromium, the range of choice of the radius of influence R of decanting point is 1.1 ~ 1.5 meters, and overlapping than δ is 8%.
In addition, the present invention gives the in-situ remediation system of the in-situ remediation method being applicable to described pollution of chromium.This in-situ remediation system comprises the drilling system of coordinating operation and medicament mixing and injected system, wherein, medicament mixing and injected system comprise grouting pump and be connected with grouting pump inject struggle against for preparing the medicament repairing medicament, grouting pump connects repairs drug delivery pipe, repair drug delivery pipe to be connected with the drilling rod of the hollow of drilling system, the front end of drilling rod offers injection orifice; After drilling system is by the front end of its drilling rod press-in zone of saturation, drilling rod is connected with reparation drug delivery pipe, and grouting pump provides high-voltage pulse that reparation medicament is injected into zone of saturation through drilling rod.
Preferred as technical scheme, described grouting pump provides the pressure of high-voltage pulse to be 0.5 ~ 18Mpa.
Compared with prior art, beneficial effect major embodiment of the present invention is in the following areas:
(1) in-situ remediation system of pollution of chromium of the present invention belongs to a kind of integrated system, only comprise drilling system and injected system two parts, reparation medicament to designated depth soil layer, directly sprays into and mixes with contaminated soil by drilling system by rod boring.Work progress is little to the direct disturbance of soil, does not substantially destroy earth formation, can keep foundation bearing capacity, is conducive to soil redevelopment and utilizes.
(2) the present invention can fix a point, depthkeeping, inject and repair medicament quantitatively to contaminated area, repairs medicament, improve and repair medicament utilization rate, reduce construction cost according to the diverse location of contaminated area, the configuration of different pollution level.
(3) injected system provides instantaneous high pressure pulse, will repair medicament and inject saturated aquifer, and form pressure break crack, make reparation medicament more easily be diffused into precalculated position in saturated aquifer, and strengthen repairing effect.
(4) fractured in-situ injection work progress does not produce factory effluent, effectively can avoid the generation of secondary pollution.
(5) fractured in-situ injects construction equipment simply, and operation requisite space is little, and the clean and tidy specification of working face, can ensure workmen's production safety to greatest extent.
(6) suitably regulating agent add than with decanting point quantity, soil and groundwater in saturated aquifer can be repaired simultaneously and pollute.Under Different Strata condition, all can reach desirable repairing effect, in underground water, pollutant levels meet corresponding repairing standard, as " groundwater quality standard GB14848-93 " etc.Its repairing efficiency is directly related with the reparation medicament of use, and as adopted electronation stabilization agent to be about 7-30 days, more suitable is 15 days, and adopt biochemical reduction stabilization agent to be about 15-90 days, more suitable is 30 days.
Accompanying drawing explanation
Fig. 1 is medicament mixing and the injected system composition schematic diagram of the in-situ remediation system of pollution of chromium described in embodiment.
Fig. 2 is the drilling system schematic diagram of the in-situ remediation system of pollution of chromium described in embodiment.
Fig. 3 repairs the schematic diagram that medicament injects saturated aquifer soil.
Fig. 4 is that the decanting point in place to be repaired arranges schematic diagram.
Fig. 5 is the in-situ remediation method logic diagram of pollution of chromium described in embodiment.
Fig. 6 is the process chart of the in-situ remediation method realizing described pollution of chromium.
Fig. 7 is Cr (VI) the change in concentration comparison diagram before and after application case EHC repairs in serious pollution soil.
Description of reference numerals: 1, medicament injects bucket; 2, grouting pump; 3, drug delivery pipe is repaired; 4, hand-held mixer; 5, drilling rod; 6, decanting point; 7, injection orifice; 8, drug injection scope is repaired; 9, decanting point center; 10, place to be repaired; 11, medicament range of scatter is repaired.
Detailed description of the invention
For the ease of understanding object of the present invention, technical scheme and effect thereof, now will be elaborated further the present invention in conjunction with the embodiments.
This gives a kind of in-situ remediation system (hereinafter referred to as in-situ remediation system) of pollution of chromium, as depicted in figs. 1 and 2, comprise medicament mixing and injected system and drilling system, drilling system mixes with medicament and injected system coordinating operation, by high-tension apparatus (grouting pump 2 of medicament mixing and injected system), reparation medicament is directly injected in place to be repaired and zone of saturation, repair medicament diffusion mobility, with Cr (VI) haptoreaction, Cr (VI) is reduced stabilisation, eliminate its health risk, reach reparation object.Described zone of saturation is saturated aquifer soil or underground water pollution district.
Wherein, medicament mixing and injected system mainly comprise grouting pump 2 and medicament injection bucket 1.Grouting pump 2 provides high-voltage pulse for being directly injected in zone of saturation by reparation medicament, and pulse is the high pressure of 0.5 ~ 18Mpa.Medicament injects bucket 1 and repairs medicament for configuration and splendid attire, and medicament injects bucket 1 and is also configured with hand-held mixer 4, for being mixed with appropriate stirring solvent by reparation medicament.Grouting pump 2 connects repairs drug delivery pipe 3, repairs the carrier pipe that drug delivery pipe 3 can select quality of rubber materials.Repair drug delivery pipe 3 to be connected with the drilling rod 5 of drilling system, the front end of drilling rod 5 offers injection orifice 7.After drilling system is by the front end of its drilling rod 5 press-in saturated aquifer, drilling rod 5 and drilling system disconnect, and are connected with reparation drug delivery pipe 3, and grouting pump 2 provides high-voltage pulse that reparation medicament is injected into zone of saturation.
The principle that in-situ remediation system described in the present embodiment realizes pollution of chromium reparation can be described as, drilling system provides hydraulic power in decanting point center 6, drilling rod 5 to be pressed into desired depth (namely described zone of saturation), medicament mixing and injected system provide high-voltage pulse, reparation medicament is made to be injected into zone of saturation from the injection orifice 7 of drilling rod 5 front end, and overcome resistance and fully spread, reach the dispersion effect of expection.As shown in Figure 3, the horizontal initial rate repairing medicament is larger, run duration is extremely short, displacement is in the horizontal direction much larger than the displacement in vertical direction, medicament overcomes in frictional resistance forward movement in approximate straight line motion, move distance is called repairs drug injection scope 8, i.e. the radius of influence of medicament injection, movement locus visualize is pressure break crack.Be full of reparation medicament in crack, move along in horizontal and vertical directions under the effect of convection current, disperse and mechanic diffusion, with target contaminant haptoreaction, repair zone of saturation and pollute.
The in-situ remediation method of pollution of chromium of the present invention can repair saturated aquifer soil, also can repair underground water.Described in-situ remediation system realizes the method for pollution of chromium reparation as shown in Figure 5 and Figure 6, mainly comprises following key points for operation.
1. preparation.
In the preparatory stage, groundwork is the radius of influence determination decanting point quantity of the decanting point according to Technical Design, in conjunction with place situation, determines sequence of construction, marks decanting point position in drawing, for place unwrapping wire is prepared.Calculate the pharmaceutical quantities of single decanting point according to the reparation adding of agent ratio of design, and same decanting point position changes pharmaceutical quantities situation of change with elevation, guidance is repaired medicament and is prepared and repair medicament injection enforcement.
1.1 determine decanting point.
Repair medicament and inject zone of saturation at decanting point, the permeation effects scope of repairing medicament is a cylinder, and cylinder radius is the radius of influence of decanting point, and cylindrical height can adjust according to the change of repairing the degree of depth; The computing formula of single decanting point area coverage is:
S＝π·R
2(1)
In formula (1), S represents decanting point area coverage; R represents the radius of influence of decanting point.The radius of influence R of decanting point is relevant with formation condition and repairing efficiency, and stratum permeability is good, the long then radius of influence of repairing efficiency is large, otherwise then little.The scope of the radius of influence R of decanting point is generally 0.9 ~ 5.0 meter, and comparatively suitable scope is 1.0 ~ 3.0 meters, and as a preferred embodiment, the radius of influence R of decanting point can be 1.1 ~ 1.5 meters.
For ensureing that repairing medicament covers all places to be repaired, should have suitable overlap joint between adjacent decanting point than (namely having a certain proportion of overlap joint or overlap between adjacent decanting point), pollutant levels are high, overlap larger than then, pollutant levels are low, overlap relatively less than then.According to the area coverage of single decanting point, the decanting point designing place to be repaired is arranged, each decanting point area coverage is connected, and need cover place to be repaired completely.The computing formula of place to be repaired decanting point total quantity is:
In formula (2), N represents place to be repaired decanting point total quantity; A represents that place to be repaired pressure break is injected and repairs the gross area; δ represents overlap joint ratio, i.e. the area of adjacent decanting point overlap and the ratio of decanting point area coverage S.Stratum permeability is good, repairing efficiency is long, then overlap than little, otherwise then large.Overlap joint is 0 ~ 13% than selectable scope, and more suitable overlap joint is 5% ~ 10% than scope, and as a preferred embodiment, overlap joint is than may be selected to be 8%.
As shown in Figure 4, spray into reparation medicament in decanting point center 9, repairing medicament range of scatter 11 will match with place 10 to be repaired, or repairing medicament range of scatter 11 is greater than place 10 to be repaired, to guarantee that each decanting point area coverage is connected, and reparation place can be covered completely.After all decanting point coordinates in place are determined, through surveying setting-out location, limb flag is as mark.
1.2 calculate pharmaceutical quantities.
The required computing formula of repairing pharmaceutical quantities in place to be repaired is:
M＝κ·m (3)
In formula (3), M represents that place to be repaired is required and repairs pharmaceutical quantities; κ represent repair medicament add ratio; M represents place to be repaired groundwater quality.
It is to be noted, place to be repaired zones of different pollution condition is often different, in practice of construction, reparation place is divided into some reparation districts by the difference of pollution concentration, each is repaired district's adding of agent and determines than according to pollution concentration, calculate the pharmaceutical quantities in each reparation district respectively, add and after be medicament total amount.
The restorative procedure that the present embodiment provides both can complete the in-situ immobilization of pollution of chromium underground water, also can complete the in-situ immobilization of saturated aquifer soil and groundwater pollution of chromium simultaneously.When completing the in-situ immobilization of saturated aquifer soil and groundwater pollution of chromium at the same time, in formula (3), m represents soil and groundwater gross mass in the saturated aquifer in place to be repaired.
2. medicament is repaired in preparation.
Reparation medicament is placed in medicament and injects bucket 1, open solvent conduit valve, add appropriate solvent in proportion.With hand-held mixer 4 Keep agitation mixed solution until reparation medicament mixes.It should be noted that, here solvent refers to clean water, directly can inject zone of saturation after most reparation medicament and clean water mixing, but after partly repairing medicament and clean water mixing, also need to add conditioning agent, add the reparation medicament after conditioning agent and just can inject zone of saturation.The conditioning agent that can select is as sulfuric acid, hydrochloric acid, ferrous sulfate, frerrous chloride.
3. decanting point location.
Start drilling system, drilling rod 5 is crept into downwards by decanting point center 6, drilling system has depthkeeping equipment, the drilling depth of drilling rod 5 front end can be observed at any time, after drilling rod 5 front end arrives predetermined drilling depth (zone of saturation), close down drilling system, disconnect the connection of drilling rod 5 and drilling system.
4. repair medicament high pressure to inject.
Be connected with drilling rod 5 by reparation drug delivery pipe 3, start grouting pump 2, inject to zone of saturation high pressure and repair medicament, repair medicament process in injection, the actual injection rate of accurate recording, closes down grouting pump 2 after reaching the injection rate of design.Especially, the different depth medicament injection rate difference to some extent of different decanting point or same decanting point.Described high pressure injects and refers to, grouting pump provides the pressure of high-voltage pulse to be 0.5 ~ 18Mpa.
After reparation medicament is injected into zone of saturation, along level and vertically both direction migration under convection current, disperse, mechanic diffusion effect, contact with Cr (VI), Cr (VI) is reduced to Cr (III), and form Cr (OH) further
3or Fe, Cr (III), OH
-the organic chelate of mineral state or Cr (III), eliminates Cr (VI) health risk.Conventional reparation medicament has calcium polysulfide, the ferrous salt that ferrous sulfate, frerrous chloride or iron ammonium sulfate etc. are solvable; The reducible sulfur compound that sodium sulfite, sodium pyrosulfite, vulcanized sodium etc. are solvable, and main component is Fe
0, organic nutrient substance is as carbohydrate, organic acid biochemical reduction stabilization agent.
Under the prerequisite not considering the problems such as cost, duration, efficiency, integration, security, the function of drilling system can be completed by equipment such as Mitsubishi's rigs, and the high voltage pulse of injected system can be completed by air compressor machine.
The present embodiment gives two problems that should be noted that:
(1) radius of influence is checked and approved.After medicament to be repaired has injected, need inside and outsidely to drill through undisturbed soil sample at the radius of influence of expection, check pressure break crack quantity, check and approve actual influence radius and whether produce a desired effect, and with actual influence radius for benchmark, redefine decanting point position and decanting point quantity.
(2) continue to monitor.Normally inject as repaired medicament, the radius of influence can reach desired extent, then tackle underground water and continue to monitor, and supplements injection reparation medicament, until reach reparation target call to not meeting the plot of repairing target call.
Mention in the introduction, the technology processing Cr (VI) polluted underground water at present mainly contains excavation post processing, Pump-and-Treat, Injection Well original position injection process and permeable reactive barrier technology.First in-situ remediation system provided by the invention and prior art are carried out effect comparison, with the many-sided superiority of detailed outstanding the present invention.
(1) in-situ immobilization.
Repaired pollution of chromium underground water, the mode adopting Pump-and-Treat, i.e. showering more in the past.First this repair mode will build a whole set of water processing establishment on ground, and the construction period is long, takies investment high.After facility operation, need to carry out manual maintenance, lost labor's cost.After Pump-and-Treat, need to recharge, recharge speed far below extraction speed, extend repairing efficiency.There is smearing in Pump-and-Treat, namely from high concentration, processes successful, in pollutant levels reduction process gradually, the corresponding decline for the treatment of effeciency, even if extract out for a long time, is also difficult to reach desirable treatment effect, even if repair up to standard in the short time, also there is bounce-back risk.
Except Pump-and-Treat, a kind of groundwater remediation mode in the past often adopted first is excavated by soil, finally processes foundation ditch waste water, will build water-stop curtain, carry out pattern foundation pit supporting structure in digging process, greatly increase construction investment cost.
The investment of in-situ immobilization capital cost is low, and operation maintenance is simple, to groundwater remediation more targetedly, repairing effect is good, repair and thoroughly do not rebound, little to underground water disturbance, substantially do not destroy earth formation.
(2) high pressure injection mode.
Usually, repair industry and also adopt Injection Well injection mode to carry out the in-situ immobilization of underground water, but be seldom applied to the reparation of Cr (VI) contaminated site.In injection process, nature stream or the low pressure of adopting is injected more, and the individual well radius of influence is little, and medicament injects uneven, and when stratum is uneven, Injection Well injects and is difficult to the repairing effect reaching expection.High pressure injection device has the injection pressure of 0.5 ~ 18Mpa, and much larger than normally used Injection Well injection pressure, the radius of influence obviously expands, and medicament diffusion effect affects less by formation condition, all can reach the desirable injection radius of influence to various formation lithology.
(3) foundation bearing capacity is kept.
Pump-and-Treat needs to build a large amount of medicament Injection Wells, destroys earth formation, produces a large amount of solid waste, affects follow-up redevelopment and utilizes.Excavation post processing, also there is sedimentation risk after backfill, is unfavorable for that subsequent development utilizes in heavy damage foundation bearing capacity.And the injection of fracturing original position does not exist such problem, adopt high pressure to inject and form the pressure break crack that width is about 2mm, formation structure does not affect substantially, keeps foundation bearing capacity.
(4) integrated device systems.
First Injection Well injects needs to build a large amount of medicament Injection Wells, and infrastructure investment is high.Well location, once build up, can not be changed, very flexible.And fracturing injection device is integrated system, only comprise drilling system, medicament mixing and injected system two parts, drilling system positions, depthkeeping, medicament mixing and injected system are carried out medicament mixing and are injected, and construction operation area is little, easy and simple to handle, go slick, can start and stop at any time, can construct on a large scale continuously again, be beneficial to through engineering approaches application.
In conjunction with in-situ remediation method and the repair system of above-mentioned pollution of chromium, the present embodiment is described the repair process of place's chromic salts contaminated site and effect.
Before repairing construction, the pollution of chromium situation of this chromic salts contaminated site is detected.After testing, the pollution of chromium of chromic salts contaminated site to be repaired is characterized as: underground water initial water level-1.5m in place, and below-1.5m is zone of saturation, is target repair coverage.When in place, during-3m, Cr (VI) concentration is 614mg/Kg ,-5m, Cr (VI) concentration is 38.6mg/Kg ,-7m, Cr (VI) concentration is 2.1mg/Kg.
For the pollution of chromium feature of chromic salts contaminated site to be repaired, adopt the in-situ remediation method of the pollution of chromium described in the present embodiment, repair the degree of depth and be chosen as 1.5 ~ 7.5m, repair medicament and use EHC medicament, after repairing, the desired value of Cr (VI) concentration is not higher than 1mg/Kg.
Repair embodiment can be briefly described into: EHC medicament, than 1.5%, is directly injected in zone of saturation soil by original position high pressure injection device by EHC adding of agent, 15 days sampling detection reaction effects afterwards.Sampling detection reaction effect is shown in Fig. 7.Cr (VI) change in concentration before and after EHC reparation contaminated soil is given from Fig. 7, in-situ immobilization district initial sample is identical with the examination sample degree of depth, be respectively-3m ,-5m ,-7m, after adopting the in-situ remediation method reparation of the pollution of chromium described in the present embodiment to complete, Cr (VI) concentration, generally lower than 1.0mg/Kg, meets and repairs desired value requirement.
Further describe invention has been above, but the present invention is not limited to above-mentioned embodiment, in the ken that one skilled in the relevant art possesses, can also make a variety of changes under the prerequisite not departing from present inventive concept in conjunction with the embodiments.
Claims (10)
1. an in-situ remediation method for pollution of chromium, is characterized in that, comprises the steps:
Step one, arranges decanting point and determines to repair pharmaceutical quantities
Repair medicament and inject zone of saturation at decanting point, the permeation effects scope of repairing medicament is a cylinder, and cylinder radius is the radius of influence of decanting point; The computing formula of single decanting point area coverage is:
S＝π·R
2(1)
In formula (1), S represents decanting point area coverage; R represents the radius of influence of decanting point;
For ensureing that repairing medicament covers all places to be repaired, should have suitable overlap joint ratio between adjacent decanting point, according to the area coverage of single decanting point, the decanting point designing place to be repaired is arranged, each decanting point area coverage is connected, and need cover place to be repaired completely; The computing formula of place to be repaired decanting point total quantity is:
In formula (2), N represents place to be repaired decanting point total quantity; A represents that place to be repaired pressure break is injected and repairs the gross area; δ represents overlap joint ratio, i.e. the area of adjacent decanting point overlap and the ratio of decanting point area coverage S; The required computing formula of repairing pharmaceutical quantities in place to be repaired is:
M＝κ·m (3)
In formula (3), M represents that place to be repaired is required and repairs pharmaceutical quantities; κ represent repair medicament add ratio; M represents place to be repaired groundwater quality;
Step 2, medicament is repaired in preparation
Reparation medicament is placed in medicament and injects bucket, add appropriate solvent, Keep agitation is until reparation medicament mixes with solvent;
Step 3, decanting point is located
Start drilling system, drilling rod is crept into downwards by decanting point center, and drilling system has depthkeeping equipment, can observe the drilling depth of drilling rod front end at any time, after drilling rod front end arrives zone of saturation, closes down drilling system, disconnects the connection of drilling rod and drilling system;
Step 4, repairs medicament and injects
To repair drug delivery pipe to be connected with drilling rod, and start grouting pump, inject in zone of saturation and repair medicament, repair medicament process in injection, the actual injection rate of accurate recording, closes down grouting pump after reaching the injection rate of design.
2. the in-situ remediation method of pollution of chromium according to claim 1, is characterized in that, described reparation medicament selects calcium polysulfide, ferrous sulfate, frerrous chloride, iron ammonium sulfate, sodium sulfite, sodium pyrosulfite or vulcanized sodium.
3. the in-situ remediation method of pollution of chromium according to claim 1, is characterized in that, in described step 4, grouting pump provides the pressure of high-voltage pulse to be 0.5 ~ 18Mpa.
4. the in-situ remediation method of pollution of chromium according to claim 1, characterized by further comprising, after medicament to be repaired has injected, need to drill through undisturbed soil sample the radius of influence of decanting point is inside and outside, check pressure break crack quantity, check and approve the actual influence radius repairing medicament whether to produce a desired effect, and with actual influence radius for benchmark, redefine decanting point position and decanting point quantity.
5. the in-situ remediation method of pollution of chromium according to claim 1, it is characterized in that, when described step one is determined to repair pharmaceutical quantities, reparation place is divided into some reparation districts by the difference of pollution concentration, each is repaired district's adding of agent and determines than according to pollution concentration, calculate the reparation pharmaceutical quantities in each reparation district respectively, each reparation pharmaceutical quantities of repairing district add and after be required reparation pharmaceutical quantities.
6. the in-situ remediation method of pollution of chromium according to claim 5, is characterized in that, in described step one, the range of choice of the radius of influence R of decanting point is 0.9 ~ 5.0 meter, and overlapping than the range of choice of δ is 0 ~ 13%.
7. the in-situ remediation method of pollution of chromium according to claim 6, is characterized in that, in described step one, the range of choice of the radius of influence R of decanting point is 1.0 ~ 3.0 meters, and overlapping than the range of choice of δ is 5 ~ 10%.
8. the in-situ remediation method of pollution of chromium according to claim 7, is characterized in that, in described step one, the range of choice of the radius of influence R of decanting point is 1.1 ~ 1.5 meters, and overlapping than δ is 8%.
9. one kind is applicable to the in-situ remediation system of the in-situ remediation method of pollution of chromium described in claim 1, it is characterized in that, the drilling system and the medicament that comprise coordinating operation mix and injected system, wherein, medicament mixing and injected system comprise grouting pump and be connected with grouting pump inject struggle against for preparing the medicament repairing medicament, grouting pump connects repairs drug delivery pipe, and repair drug delivery pipe and be connected with the drilling rod of the hollow of drilling system, the front end of drilling rod offers injection orifice; After drilling system is by the front end of its drilling rod press-in zone of saturation, drilling rod is connected with reparation drug delivery pipe, and grouting pump provides high-voltage pulse that reparation medicament is injected into zone of saturation through drilling rod.
10. the in-situ remediation system of pollution of chromium according to claim 9, is characterized in that, described grouting pump provides the pressure of high-voltage pulse to be 0.5 ~ 18Mpa.
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