CN104803572A - Method and system for carrying out sediment dredging and ectopic treatment on seasonal river heavy metal pollution - Google Patents
Method and system for carrying out sediment dredging and ectopic treatment on seasonal river heavy metal pollution Download PDFInfo
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- CN104803572A CN104803572A CN201510237304.4A CN201510237304A CN104803572A CN 104803572 A CN104803572 A CN 104803572A CN 201510237304 A CN201510237304 A CN 201510237304A CN 104803572 A CN104803572 A CN 104803572A
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Abstract
The invention relates to a method and a system for carrying out sediment dredging and ectopic treatment on seasonal river heavy metal pollution. The method comprises the following steps: (1) carrying out status survey; (2) dividing unit projects and arranging a diversion channel; (3) building a riverway sediment storage tank and an accident sediment storage tank; (4) carrying out project dredging; (5) carrying out quenching and tempering treatment on the sediment conveyed to the shore; (6) after quenching and tempering treatment, carrying out mud-water separation on the sediment; (8) screening the slurry obtained after mud-water separation; (9) carrying out resource utilization; (10) treating tail water; (11) stably solidifying and mixing the sediment; (12) carrying out stable solidification treatment. The system comprises a river sediment dredging system and a shore sediment treatment system. The method and the system are convenient to implement and operate, have higher pertinence and good treatment effect, and do not cause secondary pollution.
Description
Technical field
The present invention relates to a kind of system and method administered by heavy metal polluted bed mud dredging and dystopy for water bodys such as seasonal streams (containing river, river, rivers, river course), belong to the improvement recovery technique field of polluted bed mud.
Background technology
Bed mud is the superficial deposit material of water bottom, is the mixture of microorganism, soil ulmin, soil and silt etc., is deposited on water bottom is formed through long-time physical chemistry, biological action and water body transmission.Bed mud can reflect the historical process that water body develops, and is the important component part of the natural water ecosystems such as river, lake, mouth of the river beach.
Heavy metal in bed mud comes from atmospheric falling dust, precipitation, soil erosion, rainwash, all kinds of sewage, solid refuse and agricultural chemicals etc., there is the features such as chronicity, cumulative bad, latent and non-reversibility, by food chain thousands of hundred times ground enrichment, be finally detrimental to health.Current countries in the world to the control and plan of Heavy Metal Pollution in Sediments and Treatment process scheme different, especially in China, the factor impacts such as contaminated and Economy Contrast, still do not possess the condition of comprehensively carrying out Heavy Metal Pollution in Sediments control.
Seasonal stream, also known as broken stream, seasonal river, refers to that river is in the dry season, and river stops, riverbed is exposed; Abundance of water season, form current, even flood Pentium.This kind of river flows through the region of high temperature and drought usually, and mean annual discharge is less, but because of heavy rain, snow melt cause flood peak very large.Now because of the mankind to the excessive diversion in river, damming to make live stream become seasonal stream.The continental river of China mostly is seasonal stream.
Sediment Dredging refer to by regulation dredging scope and dredging depth, take artificial or mechanical mode to clear out by heavy metal or other bed muds (comprising mud, sand, stone and other foreign material) etc. polluted from the system of waters and the engineering processed, Dredging Process avoids secondary pollution.Sediment Dredging becomes polluted bed mud, the primary link that special heavy metal polluted bed mud dystopy is administered.
Sediment Dredging technology conventional at present mainly comprises three kinds of forms, i.e. engineering dredging, environmental dredging and ecological dredging.
Engineering dredging technology can be divided into dry method engineering to dredge and the dredging of wet method engineering usually, wherein, the dredging of dry method engineering has the advantages that mud extraction water ratio is low, volume is little, but the bed mud that heavy metal is contained in improvement basin can be made in its operating process to be exposed to for a long time in air, very easily harm to be produced to surrounding enviroment and operator; Wet method engineering dredges the secondary pollution problem that can control preferably environment, but the design form of its Cutters for Dredgers, determine it and can produce larger disturbance to water body in operation, thus the pollution substance in bed mud is moved in overlying water, disadvantageous effect can be brought to dredged region water body.Engineering dredging commonly uses dredging method as current water conservancy industry, Technology and equipment is comparatively ripe, dry method engineering dredging wherein has stronger adaptive faculty to seasonal stream, but due to its to the dredging dredging scope of object and dredging depth control overflow not high, easily cause and backbreak, owe the problem with Dredging Process secondary pollution of digging.
Technology for environmental dredging obtains extensive utilization as removing one of endogenous approach the most directly, the most fast.A kind of disclosed in Chinese patent literature CN2837389 " double-suction-port ring protects dredging reamer device ", CN101787720A disclosed " a kind of ecological dredging method and Accrete clearing device thereof " and CN103643713A disclosed a kind of " method of riverbed environmental dredging " etc. spread to reduce bed mud in Dredging Process the secondary pollution problem caused, have developed double suction mouth reamer, dredging sucker, with the dredger that cover screw reamer etc. is comparatively advanced, substantially the requirement that Dredging Process accurately controls can be met, but because above-mentioned dredging technology or equipment generally need to be equipped with hull as carrier, be applicable to the dredging work area of certain depth of water, thus limit its application at seasonal stream and popularization.
Ecological dredging is a kind of emerging dredging pattern, and mainly emphasize the desilting thickness controlling bed mud, in order to be situated between from now on, people's restoration of the ecosystem creates conditions, but technical equipment is not yet ripe, has certain environment risk.
Different according to the pollution level of polluted water body, in conjunction with the implementation condition of contaminated site, the recovery technique of heavy metal polluted bed mud conventional at present is mainly divided into original position Treatment process and dystopy Treatment process.
Original position Treatment process mainly comprises original position phytoremediation and in-situ materials soverlay technique, its situ phytoremediation is low, simple to operate with its cost, not easily produce the advantages such as secondary pollution and receive much concern, but still there is the defects such as processing efficiency is low, plant growing is subject to local climate, the impact of river course flood situation.In-situ materials soverlay technique is at bed mud surface coverage passivating material, block heavy metal to the delivery pathways in water body, affect larger by the physicochemical property of covering material and the water conservancy hydrological characteristics of natural water, and there is no reliable covering material dispensing device at present, realize all even larger without leak source covering difficulty.Therefore, for heavy contamination water body or original position difficulty of governance larger time, normal adopt dystopy Treatment process.
Dystopy Treatment process is a kind of " Ex-situ remediation method of heavy metal polluted bed mud " disclosed in CN102372406, primarily of sediment digging and conveying, the antiseepage of reparation district and draining, bed mud modifying agent with microbial strains adds, microorganism and plant combined reparation, wastewater treatment and plant harvesting and incineration disposal unit form; Concrete steps first carry out repairing addressing and the Anti-seeping technology in district, adopt engineering method that heavy metal polluted bed mud is dredged again and be transported to and repair district, then the discharging consolidation process of bed mud is carried out, then bed mud modifying agent is added and microbial strains fully mixes with bed mud and cultivates plant, finally gathering in plant after being burned, being transported to hazardous waste landfill landfill or for reclaiming heavy metal element burning ash.The dredging of bed mud dystopy combines with plant absorbing process method by the method, compared with polluted bed mud chemical treatment method, there is low, the eco-friendly advantage of processing cost, but due to needs dredging, it easily produces and pollutes release in Dredging Process, affects Upper water's quality; In addition, for the bed mud that pollution level is heavier, plant is difficult to grow in bed mud, also limit the application of the method.
Therefore, need badly for seasonal stream, in detailed sediment pollution on-site investigation and hydrological survey basis, dispose requirement according to heavy metal contamination process, Sediment Dredging and the dystopy of the applicable seasonal stream hydrologic condition of exploitation and heavy metal polluted bed mud administer administering method and system thereof.
Summary of the invention
The present invention is directed to the problem that current seasonal stream lacks system and heavy metal contamination dredging and bed mud Treatment process targetedly, provide a kind of systematicness, specific aim and handiness are strong, regulation effect good, be convenient to implement seasonal stream heavy metal polluted bed mud to dredge and dystopy administering method and system.
Seasonal stream heavy metal polluted bed mud dredging of the present invention and dystopy administering method, comprise the following steps:
(1) first topographic mapping and Heavy Metal Pollution in Sediments on-site investigation are carried out to the river course of dredging target section, simultaneously carry out detailed River Hydrology investigation for target section, then according to engineering construction condition to whole target river reach's dividing element project; Engineering construction condition comprises river topography landforms, hydrologic condition and interim disposal field condition;
(2) by section cofferdam, whole dredging target section enclosing, by between the unit engineering divided with interval, unit cofferdam (section cofferdam and unit cofferdam channel deposits and other sandstone material are banked up and are formed), in medullary ray both sides, river course or one-sidedly arrange diversion channel, diversion channel runs through whole dredging target section; Make river utilize the guide effect of cofferdam and diversion channel to flow into downstream smoothly like this, keep the normal flood passage function in river to the full extent;
The section of diversion channel is according to the requirement design of the maximum water flow of construction period correspondence section, and concrete flow is determined according to the corresponding run-off in two sides, river.
(3) in each at least one river bottom mud of element project internal construction storage pond and at least one accident bed mud storage pond, in river bottom mud storage pond, mud lift pump is installed, installation accident mud lift pump in accident bed mud storage pond; River bottom mud storage pond is used for collecting the bed mud mud in Dredging Process, with satisfied lifting needs; Accident bed mud storage Chi Shiwei avoids construction period to meet with extreme weather (heavy rain etc.), causes polluted river water to pollute uncontaminated section, downstream with letting out under current and arrange (accident bed mud storage pond can several element project share);
The position in river bottom mud storage pond is to be advisable near sediment pollution region, and volume can arrange in conjunction with the duration, determines according to element project amount and lift pump flow.The particular location in accident bed mud storage pond is arranged flexibly in conjunction with river course actual landform landforms.
Compacting at the bottom of the pond in river bottom mud storage pond or lay sand stone layer, to meet the mud requirement of depositing in engineering machinery turnover and labor cleaning's construction process, and adopts wear-resisting water proof material to carry out Anti-seeping technology, to prevent in bed mud heavy metal with oozing polluted underground water under water.
The concrete volume in accident bed mud storage pond is comprehensively determined according to the element project water catchment area in local storm intensity, run-off and service range, can meet the retaining requirement under the accidental state of whole target section.The particular location in accident bed mud storage pond is arranged flexibly in conjunction with river course actual landform landforms.
Compacting at the bottom of the pond in accident bed mud storage pond or lay sand stone layer, to meet the mud requirement of depositing in engineering machinery turnover and labor cleaning's construction process, and adopts wear-resisting water proof material to carry out Anti-seeping technology, to prevent in bed mud heavy metal with oozing polluted underground water under water.
(4) start unit engineering dredging, adopts high pressure to wash away water pump or geotechnique's machinery, requires to carry out engineering dredging operation to bed mud according to dredging scope and dredging depth;
When possessing sluicing operating condition, adopt high pressure to wash away water pump and the bed mud after washing away is poured river bottom mud storage pond; By the screen cloth of river bottom mud storage pond feed-water end, screen out partial particulate (particle diameter > 1cm or determine according to mesh size), other bed mud enters river bottom mud storage pond, is promoted on the bank; When not possessing sluicing operating condition, adopt geotechnological machinery to carry out dredging operation, the bed mud excavated or the mix and blend that adds water possess lifting condition laggard enter river bottom mud storage pond, or be directly transported on the bank; By extreme weather affect cause a certain element project by rain drop erosion serious time, excessive polluted bed mud is delivered to accident bed mud storage pond keep in, deliver in the lump on the bank again after accidental state terminates;
(5) whole dredging engineering terminates and after acceptance(check), removes unit cofferdam, section cofferdam, diversion channel, river bottom mud storage pond and accident bed mud storage pond;
(6) before the bed mud after dredging processes disposal on the bank, room is detected and is analyzed and field pilot test first by experiment, determines the content situation of heavy metal in the size distribution situation of bed mud and different-grain diameter bed mud after the dredging of target section; Then process respectively by following situation:
Bed mud for being dug out by geotechnological machinery in step (4):
1. when the massfraction that the particle diameter wherein contained is greater than the cobble of 4.75mm is more than or equal to 10%, adopt river drip washing, analysis heavy metal content is detected to the cobble washed out or rubble, if heavy metal content exceeds standard, then add chemical leaching liquid (EDTA etc.), chemical leaching is carried out to bed mud, until the heavy metal in the cobble washed out or rubble meets building materials use standard, outward transport recycling;
2. the massfraction being greater than the cobble of 4.75mm when the particle diameter wherein contained is less than 10%, and in bed mud, particle diameter is massfraction that the coarse sand of 1.18mm ~ 4.75mm and particle diameter are greater than the cobble of 4.75mm when being less than 10%, then make bed mud directly carry out modifier treatment;
3. the massfraction being greater than the cobble of 4.75mm when the particle diameter wherein contained is less than 10%, and particle diameter is that massfraction that the coarse sand of 1.18mm ~ 4.75mm and particle diameter are greater than the cobble of 4.75mm is when being more than or equal to 10% in bed mud, then river drip washing is adopted to bed mud, analysis heavy metal content is detected to the cobble washed out and coarse sand, if heavy metal content exceeds standard, then chemical leaching is carried out to bed mud, until the heavy metal in the cobble washed out and coarse sand meets building materials use standard, outward transport recycling; Bed mud after washed-out sand process carries out modifier treatment;
(7) for the bed mud in step (6) after drip washing process:
1., when coarse sand massfraction is wherein less than 10%, directly modifier treatment is carried out;
2. when coarse sand massfraction is wherein more than or equal to 10%, river drip washing is adopted to bed mud, analysis heavy metal content is detected to the coarse sand washed out, if heavy metal content exceeds standard, then chemical leaching is carried out to bed mud, until the heavy metal in the coarse sand washed out meets building materials use standard, outward transport recycling; Bed mud after drip washing carries out modifier treatment.
(8) the temporary bed mud of the bed mud that obtains and accident bed mud storage pond is washed away in step (4) through high-pressure hydraulic, be pumped on the bank, carry out drip washing process according to the process of step (6) and step (7), or directly carry out modifier treatment;
(9) mud after modifier treatment carries out muddy water precipitate and separate;
(10) for the supernatant liquor after step (9) precipitate and separate, process respectively by following situation:
1. meet emission standard not containing leacheate, directly to discharge;
2. do not meet emission standard not containing leacheate, process rear discharge up to standard;
3. containing chemical leaching liquid, do not possess leacheate recovery value, but meet emission standard, directly discharge;
4. containing chemical leaching liquid, do not possess leacheate recovery value, but do not meet emission standard, process rear discharge up to standard;
5. containing chemical leaching liquid, possess leacheate recovery value, process; Leacheate after process meets and recycles requirement, recycles; Leacheate after process can not meet service requirements, but the requirement of satisfied discharge water body, water body near direct draining; Leacheate after process can not meet service requirements, can not meet again discharge water body requirement, carry out processing rear qualified discharge;
(11) mud after step (9) precipitate and separate is processed respectively by following situation:
1., when the massfraction being fine sand and the cobble do not screened out and coarse sand in 0.075mm ~ 1.18mm when the particle diameter wherein contained is more than or equal to 10%, centering fine sand and cobble and coarse sand screen out; Analysis heavy metal content is detected to the cobble sifted out, coarse sand and middle fine sand, if heavy metal content meets building materials use standard, direct outward transport recycling, if heavy metal content exceeds standard, then carry out stabilizing treatment by stablizer (sequestrant, polysulfide etc.) to bed mud, after the bed mud after stable meets relevant disposal (Land_use change, burning, landfill etc.) standard, outward transport is rationally disposed;
2. in wherein containing, the massfraction of fine sand and the cobble do not screened out and coarse sand is less than 10%, and in bed mud, particle diameter is the thick mud of 0.020mm ~ 0.075mm and the massfraction of middle fine sand, cobble and coarse sand when being less than 10%, carries out solid-liquid separation;
3. in wherein containing, the massfraction of fine sand and the cobble do not screened out and coarse sand is less than 10%, but thick mud in mud, middle fine sand, when the massfraction of cobble and coarse sand is greater than 10%, thick mud is wherein screened out, analysis heavy metal content is detected to the thick mud sifted out, if meet relevant disposal (Land_use change, burn, landfill etc.) after standard outward transport rationally dispose, mud under sieve carries out solid-liquid separation, if heavy metals exceeding standard, then by stablizer (sequestrant, polysulfide etc.) stabilizing treatment is carried out to bed mud, bed mud after stable meets relevant disposal (Land_use change, burn, landfill etc.) after standard outward transport dispose,
(12) for the mud after solid-liquid separation, nurse one's health by adding flocculation agent; For the supernatant liquor after solid-liquid separation, then process respectively by following situation:
1. in supernatant liquor not containing stablizer, and meet emission standard, directly discharge;
2. in supernatant liquor not containing stablizer, but do not meet emission standard, process rear discharge up to standard;
3. in supernatant liquor containing stablizer, do not possess stablizer recovery value, but meet emission standard, directly discharge;
4. in supernatant liquor containing stablizer, do not possess stablizer recovery value, but do not meet emission standard, process rear discharge up to standard;
5. in supernatant liquor containing stablizer, possess stablizer and to reclaim service requirements, recycle;
(13) mud after conditioning adopts mechanical dewatering equipment to dewater;
Supernatant liquor for after dehydration:
1. in supernatant liquor not containing stablizer, and meet emission standard, directly discharge;
2. in supernatant liquor not containing stablizer, but do not meet emission standard, process rear discharge up to standard;
3. in supernatant liquor containing stablizer, do not possess stablizer recovery value, but meet emission standard, directly discharge;
4. in supernatant liquor containing stablizer, do not possess stablizer recovery value, but do not meet emission standard, process rear discharge up to standard;
5. in supernatant liquor containing stablizer, possess stablizer and to reclaim service requirements, recycle;
Mud cake for after dehydration:
1. as the bed mud after dehydration meets the standard-required in ultimate disposal place, directly outer running is rationally disposed;
2. as the bed mud after dehydration directly can not meet the standard-required in ultimate disposal place, then make water ratio meet the stirring of follow-up stable curing and require laggard line stabilization solidification treatment;
(14) bed mud after dehydration and stabiliser solution carry out abundant mix and blend reaction, and carry out stable curing process, the bed mud after stable curing process should meet the standard-required in ultimate disposal place.
Realize the seasonal stream heavy metal polluted bed mud dystopy governing system of aforesaid method, by the following technical solutions:
This system, comprises bed mud in river dredging system and sludge handling system two portions on the bank:
Bed mud in river dredging system comprises river bottom mud storage pond, accident bed mud storage pond, mud lift pump and accident mud lift pump, river bottom mud storage pond comprises mud inlet end, overcurrent gallery and mud outlet end successively, mud inlet end is provided with at least one screen cloth, mud outlet end is provided with collection mud pit, collection is provided with bed mud mud lift pump in mud pit, installation accident mud lift pump in accident bed mud storage pond, bed mud mud lift pump and accident mud lift pump all mix modified pond by pipeline with the roller-type stone washing machine in sludge handling system on the bank or mud and are connected;
Sludge handling system comprises roller-type stone washing machine on the bank, collection mud sump, screw sand washer, the molten medicine device of leacheate, ring waste reaction tank, leacheate precipitation pond for recovering, mud mixes modified pond, mud settling sump, vibratory screening apparatus, hydrocyclone, mud concentration basin, mud conditioner, mechanical dewatering equipment, stable curing whipping device, tail water chemical reaction pond, tail water chemical precipitation pond, the molten medicine device of flocculation agent and the molten medicine device of stablizer; All molten with the leacheate medicine device of roller-type stone washing machine and screw sand washer is connected; Roller-type stone washing machine is connected with collection mud sump; Collection mud sump is connected with screw sand washer by the lift pump set within it; Screw sand washer, mud mix modified pond, mud settling sump, ring waste reaction tank and leacheate precipitation pond for recovering be connected successively; Mud settling sump is connected with ring waste reaction tank; Mud settling sump is connected with vibratory screening apparatus by the lift pump set within it, and vibratory screening apparatus is connected with hydrocyclone by lift pump, and hydrocyclone, mud concentration basin, mud conditioner, mechanical dewatering equipment are connected successively with stable curing whipping device; Mud concentration basin, tail water chemical reaction pond are connected successively with tail water chemical precipitation pond; The molten medicine device of stablizer is connected with vibratory screening apparatus; The molten medicine device of flocculation agent is connected with sludge conditioning pond.
The degree of depth of overcurrent gallery in river bottom mud storage pond is generally no more than 0.5m, and the gradient is not less than 0.1%, so that the smooth overcurrent of bed mud and carry out artificial or mechanical desilting when depositing serious.
The present invention fully in conjunction with the technology implementation difficulty of seasonal stream Sediment Dredging and improvement, by primary abatement sport technique segment modularization, in conjunction with place place specified conditions, can select, is convenient to implementation and operation flexibly.There is following characteristics:
1., fully in conjunction with the control overflow that the hydrologic condition of seasonal stream, execution conditions and heavy metal polluted bed mud are administered, solve the situation of current seasonal stream heavy metal polluted bed mud Treatment process specific aim and handiness deficiency.
2. taken into full account that the contingent various factors of construction process is as rainstorm weather etc., fully presents the systematicness of Heavy Metal Pollution Control work.
3., fully in conjunction with local specified conditions, there is stronger specific aim.
Implementation and operation is convenient in the present invention, has stronger specific aim and handiness, and regulation effect is good, can not produce secondary pollution.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of seasonal stream heavy metal polluted bed mud dystopy governing system of the present invention.
In figure: 1, section cofferdam, 2, river bottom mud storage pond, 3, element project, 4, accident bed mud storage pond, 5, unit cofferdam, 6, diversion channel, 7, close bed mud transport trolley, 8, roller-type stone washing machine, 9, collection mud sump, 10, screw sand washer, 11, the molten medicine device of leacheate, 12, mud mixes modified pond, 13, mud settling sump, 14, ring waste reaction tank, 15, leacheate precipitation pond for recovering, 16, high frequency linear vibratory screening apparatus, 17, hydrocyclone, 18, mud concentration basin, 19, mud conditioner, 20, mechanical dewatering equipment, 21, stable curing whipping device, 22, tail water chemical reaction pond, 23, tail water chemical precipitation pond, 24, the molten medicine device of flocculation agent, 25, the molten medicine device of stablizer.
Embodiment
With reference to " cobble for building, rubble " (GB14685 ~ 2011) and " building sand " (GB14684 ~ 2011) standard, according to bed mud size, generally bed mud can be divided into cobble, sand and mud, wherein cobble refer to be formed by weathering, potamic transport and sorting, accumulation, particle diameter is greater than the rock particles of 4.75mm; Sand refers to Nature creating, and the particle diameter through man-made recovery and screening is greater than 0.75mm, is less than the rock particles of 4.75mm, comprises river sand, lake sand, mountain sand, desalted sea sand, but does not comprise rock particles that is soft, weathering; Mud refers to that particle diameter is less than the rock particles of 0.75mm, comprises river sand, lake sand, mountain sand, desalted sea sand, but does not comprise rock particles that is soft, weathering.
With reference to above-mentioned standard, sand can be divided into again in the coarse sand of 1.18mm ~ 4.75mm, particle diameter 0.075mm ~ 1.18mm according to size, fine sand; Mud is divided into the thick mud of 0.02mm ~ 0.075mm and the thin mud of below 0.02mm according to size;
Experimental studies have found that, in bed mud, the heavy metal contaminants primary attachment of more than 70% is less than on the mud particle of 0.02mm at particle diameter, different zones, different bed mud type, and above-mentioned absorption particle size range is slightly different.
Seasonal stream heavy metal polluted bed mud of the present invention dredging and dystopy governing system, comprise bed mud in river dredging system and sludge handling system two portions on the bank, specifically as shown in Figure 1.
Bed mud in river dredging system, comprises river bottom mud storage pond 2 and accident bed mud storage pond 4.River bottom mud stores up pond 2 for collecting the bed mud mud in Dredging Process, with satisfied lifting needs.Accident bed mud storage pond 4 is for avoiding construction period to meet with extreme weather (heavy rain etc.), causes polluted river water to pollute uncontaminated section, downstream with letting out under current and arrange.
River bottom mud storage is provided with bed mud mud lift pump in pond 2, installation accident mud lift pump in accident bed mud storage pond 4, bed mud mud lift pump and accident mud lift pump all mix modified pond 5 by pipeline with the roller-type stone washing machine 1 in sludge handling system on the bank or mud and are connected.River bottom mud storage pond 2 comprises mud inlet end, overcurrent gallery and mud outlet end successively according to overcurrent order; Mud inlet end is provided with at least one screen cloth; The degree of depth of overcurrent gallery is generally no more than 0.5 meter, and the gradient is not less than 0.1% so that the smooth overcurrent of bed mud and deposit serious time carry out artificial or mechanical desilting; Mud outlet end is provided with collection mud pit, promotes the lifting of water pump for mud, and collection is provided with mud lift pump in mud pit, and collection mud pit volume is according to the flow rate calculation of the mud lift pump adopted.
Anti-seeping technology is carried out, to prevent in bed mud heavy metal with oozing polluted underground water under water at the bottom of the pond in river bottom mud storage pond 2 and accident bed mud storage pond 4.
Sludge handling system on the bank, comprises roller-type stone washing machine 8, collection mud sump 9, screw sand washer 10, the molten medicine device of leacheate 11, mud mixes modified pond 12, mud settling sump 13, ring waste reaction tank 14, leacheate precipitation pond for recovering 15, vibratory screening apparatus 16, hydrocyclone 17, mud concentration basin 18, sludge conditioning pond 19, mechanical dewatering equipment 20, stable curing whipping device 21, tail water chemical reaction pond 22, tail water chemical precipitation pond 23, the molten medicine device of flocculation agent 24 and the molten medicine device 25 of stablizer.All molten with the leacheate medicine device 11 of roller-type stone washing machine 8 and screw sand washer 9 is connected.Roller-type stone washing machine 8 is connected with collection mud sump 9, and collection mud sump 9 is connected with screw sand washer 10 by the lift pump set within it.Screw sand washer 10, mud mix modified pond 12, mud settling sump 13, ring waste reaction tank 14 and leacheate precipitation pond for recovering 15 be connected successively, mud settling sump 13 is connected with vibratory screening apparatus 16 by the lift pump set within it.Vibratory screening apparatus 16 is connected with hydrocyclone 17 by lift pump, and hydrocyclone 17, mud concentration basin 18, mud conditioner 19, mechanical dewatering equipment 20 are connected successively with stable curing whipping device 21.Mud concentration basin 18, tail water chemical reaction pond 22 are connected successively with tail water chemical precipitation pond 23.The molten medicine device 25 of stablizer is connected with vibratory screening apparatus 16.The molten medicine device 24 of flocculation agent is connected with sludge conditioning pond 19.Vibratory screening apparatus 16 can adopt high frequency linear vibratory screening apparatus.The molten medicine device of leacheate 11, the molten medicine device of stablizer 25 can adopt existing Integral dissolving medicine feeding device with the molten medicine device of flocculation agent 24.Mechanical dewatering equipment 20 can adopt plate-and-frame filter press and centrifuge etc.Stable curing whipping device 21 can adopt various stirrer.
The specific implementation process that said system carries out the dredging of seasonal stream heavy metal polluted bed mud and dystopy improvement is as described below.
(1) first topographic mapping and Heavy Metal Pollution in Sediments on-site investigation are carried out to the river course of dredging target section, carry out detailed River Hydrology investigation for target section simultaneously, then according to engineering construction condition, several element projects 3 are become to whole target river reach's dividing.Engineering construction condition comprises river topography landforms, hydrologic condition and interim disposal field condition;
(2) by front and back two place, whole dredging target section section cofferdam 1 enclosing, by between the unit engineering 3 that divides with vertical or horizontal interval, unit cofferdam 5.Bank up with materials such as channel deposits and other sandstones and form in section cofferdam 1 and unit cofferdam 5, at medullary ray both sides, river course or the one-sided diversion channel 6 (being all arrange diversion channel 6 in both sides in Fig. 1) that arranges, diversion channel passes through 6 wears whole dredging target river.Make river utilize the guide effect of cofferdam and diversion channel 6 to flow into downstream smoothly like this, keep the normal flood passage function in river to the full extent.
The section of diversion channel 6 is according to the requirement design of the maximum water flow of construction period correspondence section, and concrete flow is determined according to the corresponding run-off in two sides, river.
(3) in each element project 3 internal construction river bottom mud storage pond 2 and accident bed mud storage pond 4, in river bottom mud storage pond 2, bed mud mud lift pump is installed, installation accident mud lift pump in accident bed mud storage pond 4.River bottom mud stores up pond 2 for collecting the bed mud mud in Dredging Process, with satisfied lifting needs.Accident bed mud storage pond 4 is for avoiding construction period to meet with extreme weather (heavy rain etc.), causes polluted river water to pollute uncontaminated section, downstream with letting out under current and arrange (accident bed mud storage pond 4 can several element project share).
River bottom mud storage pond 2 comprises mud inlet end, overcurrent gallery and mud outlet end successively according to overcurrent order; Mud inlet end is provided with at least one screen cloth; The degree of depth of overcurrent gallery is generally no more than 0.5 meter, and the gradient is not less than 0.1% so that the smooth overcurrent of bed mud and deposit serious time carry out artificial or mechanical desilting; Mud outlet end is provided with collection mud pit, promotes the lifting of water pump for mud, and collection mud pit volume is according to the flow rate calculation of the mud lift pump adopted.The concrete volume in river bottom mud storage pond 2 arranged in conjunction with the duration, determined according to element project amount and lift pump flow.The particular location in river bottom mud storage pond 2 is arranged flexibly in conjunction with river course actual landform landforms.
The concrete volume in accident bed mud storage pond 4 is comprehensively determined according to the element project water catchment area in local storm intensity, run-off and service range, can meet the retaining requirement under the accidental state of whole target section.The particular location in accident bed mud storage pond 4 is arranged flexibly in conjunction with river course actual landform landforms.
Compacting or laying sand stone layer at the bottom of the pond in river bottom mud storage pond 2 and accident bed mud storage pond 4, to meet the mud requirement of depositing in engineering machinery turnover and labor cleaning's construction process, and adopt wear-resisting water proof material to carry out Anti-seeping technology, to prevent in bed mud heavy metal with oozing polluted underground water under water.
(4) dredging of start unit engineering 3, when adopting high pressure to wash away operation, the bed mud after washing away directly enters river bottom mud storage pond; By the screen cloth of river bottom mud storage pond feed-water end, screen out larger particles (> 1cm or determine according to mesh size), other bed mud enters collection mud pit, water side along the overcurrent gallery in river bottom mud storage pond, delivers to specified location on the bank by lift pump.Do not possess sluicing operation, when adopting geotechnological mechanical work, bed mud is both by simple and easy bed mud mixed stirring device, the bed mud of lower for the water ratio excavated (general about 55%) is added water be mixed into water ratio higher (general about 90%) can for promote bed mud after pumping enter river bottom mud storage pond, also can directly be transported to specified location on the bank.By extreme weather affect cause a certain element project by rain drop erosion serious time, startup accident mud lift pump, excessive polluted bed mud is delivered to accident bed mud storage pond keep in, be pumped to specified location on the bank in the lump again after accidental state terminates.
The low water season as far as possible choosing suitable construction carries out engineering construction.
(5) whole dredging engineering terminates and after acceptance(check), removes unit cofferdam 5, section cofferdam 1, diversion channel 6, river bottom mud storage pond 2 and accident bed mud storage pond 4.
(6) before the bed mud after dredging processes disposal on the bank, room is detected and is analyzed and field pilot-scale first by experiment, determines the content situation of heavy metal in the size distribution situation of bed mud and different-grain diameter bed mud after the dredging of target section.
Bed mud for being dug out by geotechnological machinery in step (4):
1. when the cobble wherein contained (particle diameter > 4.75mm) content is more (massfraction is greater than 10%), roller-type stone washing machine 8 is transported to by closed bed mud transport trolley 7, adopt river drip washing, analysis heavy metal content is detected to the cobble washed out or rubble, if heavy metal content exceeds standard, then add chemical leaching liquid (EDTA etc.) by the molten medicine device 11 of leacheate to roller-type stone washing machine 8, chemical leaching is carried out to bed mud, until the heavy metal in the cobble washed out meets building materials use standard, outward transport recycling.
2. when the cobble wherein contained (particle diameter > 4.75mm) content less (massfraction is less than 10%), and bed mud medium coarse sand (1.18mm < particle diameter < 4.75mm) and cobble content is less time (massfraction is less than 10%), bed mud directly enters mud mixing equalizing tank 12;
3. when the cobble wherein contained or rubble (particle diameter > 4.75mm) content less (massfraction is less than 10%), but bed mud medium coarse sand (1.18mm < particle diameter < 4.75mm) and cobble content is more time (massfraction is greater than 10%), bed mud enters screw sand washer 10, river is adopted to carry out drip washing, analysis heavy metal content is detected to the cobble washed out and coarse sand, if heavy metal content exceeds standard, then add chemical leaching liquid (EDTA etc.) by the molten medicine device 11 of leacheate to screw sand washer 10, chemical leaching is carried out to bed mud, until the heavy metal in the cobble washed out and coarse sand meets building materials use standard, outward transport recycling.Bed mud after washed-out sand process enters mud mixing equalizing tank 12.
(7) for the bed mud in step (6) after drip washing process:
1., when coarse sand (1.18mm < particle diameter < 4.75mm) content is wherein less (massfraction is less than 10%), mud mixing equalizing tank 12 is directly entered;
2. when coarse sand (1.18mm < particle diameter < 4.75mm) content is wherein more (massfraction is greater than 10%), bed mud enters screw sand washer 10 through collection mud sump 9, adopt river drip washing, analysis heavy metal content is detected to the coarse sand washed out, if heavy metal content exceeds standard, then add chemical leaching liquid (EDTA etc.) by the molten medicine device 11 of leacheate to screw sand washer 10, chemical leaching is carried out to bed mud, until the heavy metal in the coarse sand washed out meets building materials use standard, outward transport recycling.Bed mud after drip washing enters mud mixing equalizing tank 12.
(8) the temporary bed mud of the bed mud that obtains and accident bed mud storage pond 4 is washed away in step (4) through high-pressure hydraulic, be transported on the bank through lift pump, carry out drip washing process according to the process of step (6) and step (7), or directly enter mud mixing equalizing tank 12.
(9) after the modifier treatment of mud mixing equalizing tank 12, enter mud settling sump 13, carry out muddy water precipitate and separate.
(10) for the supernatant liquor after step (9) precipitate and separate:
1. when wherein not containing leacheate, and meet emission standard, directly discharge;
2. when wherein not containing leacheate, but do not meet emission standard, enter tail water treatment system and process, rear discharge up to standard;
3. when wherein containing chemical leaching liquid, do not possess leacheate recovery value, but meet emission standard, directly discharge;
4. when wherein containing chemical leaching liquid, do not possess leacheate recovery value, but do not meet emission standard, enter tail water treatment system and process, qualified discharge after process;
5. when wherein containing chemical leaching liquid, possess leacheate recovery value, enter ring waste reaction tank 14 and process; Leacheate after process can meet and recycles requirement, reclaims settling tank 15 enter the molten medicine device 11 of integrated leacheate and recycle by leacheate.Leacheate after process can not meet service requirements, can meet discharge water body requirement, can water body near direct draining up to standard.Leacheate after process can not meet service requirements, can not meet again discharge water body requirement, qualified discharge after tail water chemical reaction pond 22 delivered to by lift pump and tail water chemical precipitation pond 23 processes.
(11) to the mud after step (9) precipitate and separate:
1. when fine sand in wherein containing (0.075mm < particle diameter < 1.18mm) and the cobble do not screened out and coarse sand content more time (massfraction is greater than 10%), by high frequency linear vibratory screening apparatus 16, fine sand in wherein and the cobble do not screened out and coarse sand are screened out, to the cobble sifted out, coarse sand and middle fine sand detect analysis heavy metal content, if heavy metal content meets building materials use standard, direct outward transport recycling, if heavy metal content exceeds standard, then by stablizer (sequestrant, polysulfide etc.) stabilizing treatment is carried out to bed mud, bed mud after stable meets relevant disposal (Land_use change, burn, landfill etc.) after standard outward transport rationally dispose.
2. when fine sand in wherein containing (0.075mm < particle diameter < 1.18mm) and the cobble do not screened out and coarse sand content less time (massfraction is less than 10%), and when in bed mud, thick mud (0.020mm < particle diameter < 0.075mm), middle fine sand, cobble and coarse sand content are less (massfraction is less than 10%), bed mud directly enters mud concentration basin 18.
3. when fine sand in wherein containing (0.075mm < particle diameter < 1.18mm) and the cobble do not screened out and coarse sand content less time (massfraction is less than 10%), and thick mud (0.020mm < particle diameter < 0.075mm) in bed mud, middle fine sand, cobble and coarse sand content larger time (massfraction is greater than 10%), bed mud enters hydrocyclone 17, thick mud is wherein screened out, analysis heavy metal content is detected to the thick mud sifted out, if meet relevant disposal (Land_use change, burn, landfill etc.) after standard outward transport rationally dispose, mud under sieve directly enters mud concentration basin 18, if heavy metals exceeding standard, then by stablizer (sequestrant, polysulfide etc.) stabilizing treatment is carried out to bed mud, bed mud after stable meets relevant disposal (Land_use change, burn, landfill etc.) after standard outward transport rationally dispose,
(12) mud carries out solid-liquid separation in mud concentration basin 18;
Supernatant liquor for after solid-liquid separation:
1. in supernatant liquor not containing stablizer, and meet emission standard, directly discharge;
2. in supernatant liquor not containing stablizer, but do not meet emission standard, enter tail water treatment system and process, rear discharge up to standard;
3. in supernatant liquor containing stablizer, do not possess stablizer recovery value, but meet emission standard, directly discharge;
4. in supernatant liquor containing stablizer, do not possess leacheate recovery value, but do not meet emission standard, enter tail water treatment system and process, rear discharge up to standard;
5. in supernatant liquor containing stablizer, possess stablizer and reclaim service requirements, enter the molten medicine device 25 of stablizer and carry out process recovery.
The bed mud mud that concentration after concentrated is higher enters mud conditioner 19, adds flocculation agent, nurse one's health mud by the molten medicine device 24 of flocculation agent in mud conditioner 19.
(13) mud after conditioning adopts mechanical dewatering equipment 20 to dewater;
Supernatant liquor for after dehydration:
1. in supernatant liquor not containing stablizer, and meet emission standard, directly discharge;
2. in supernatant liquor not containing stablizer, but do not meet emission standard, enter tail water treatment system and process, qualified discharge after process;
3. in supernatant liquor containing stablizer, do not possess stablizer recovery value, but meet emission standard, directly discharge;
4. in supernatant liquor containing stablizer, do not possess leacheate recovery value, but do not meet emission standard, enter tail water treatment system and process, qualified discharge after process;
5. in supernatant liquor containing stablizer, possess stablizer and reclaim service requirements, enter the molten medicine device 25 of stablizer and carry out process recovery;
Mud cake for after dehydration:
1. as the bed mud after dehydration meets the standard-required in ultimate disposal place, directly outer running is rationally disposed;
2. as the bed mud after dehydration directly can not meet the standard-required in ultimate disposal place, then enter bed mud stable curing whipping appts after making bed mud water ratio meet follow-up stable curing stirring requirement and carry out stable curing process.
(14) bed mud after dehydration and stabiliser solution carry out abundant mix and blend reaction, and carry out stable curing process, the bed mud after stable curing process should meet the standard-required in ultimate disposal place.
Claims (3)
1. the dredging of seasonal stream heavy metal polluted bed mud and a dystopy administering method, is characterized in that, comprise the following steps:
(1) topographic mapping and Heavy Metal Pollution in Sediments on-site investigation are carried out to the river course of dredging target section, simultaneously carry out detailed River Hydrology investigation for target section, then according to engineering construction condition to whole target river reach's dividing element project; Engineering construction condition comprises river topography landforms, hydrologic condition and interim disposal field condition;
(2) by section cofferdam, whole dredging target section enclosing, by between the unit engineering that divides with interval, unit cofferdam, in medullary ray both sides, river course or one-sidedly arrange diversion channel, diversion channel runs through whole dredging target section; Make river utilize the guide effect of cofferdam and diversion channel to flow into downstream smoothly like this, keep the normal flood passage function in river to the full extent;
(3) in each at least one river bottom mud of element project internal construction storage pond and at least one accident bed mud storage pond, in river bottom mud storage pond, mud lift pump is installed, installation accident mud lift pump in accident bed mud storage pond; River bottom mud storage pond is used for collecting the bed mud mud in Dredging Process, with satisfied lifting needs; Accident bed mud storage Chi Shiwei avoids construction period to meet with extreme weather, causes polluted river water to pollute uncontaminated section, downstream with letting out under current and arrange;
(4) start unit engineering dredging, adopts high pressure to wash away water pump or geotechnique's machinery, requires to carry out engineering dredging operation to bed mud according to dredging scope and dredging depth;
When possessing sluicing operating condition, adopt high pressure to wash away water pump and the bed mud after washing away is poured river bottom mud storage pond; By the screen cloth of river bottom mud storage pond feed-water end, screen out partial particulate, other bed mud enters river bottom mud storage pond, is promoted on the bank; When not possessing sluicing operating condition, adopt geotechnological machinery to carry out dredging operation, the bed mud excavated or the mix and blend that adds water possess lifting condition laggard enter river bottom mud storage pond, or be directly transported on the bank; By extreme weather affect cause a certain element project by rain drop erosion serious time, excessive polluted bed mud is delivered to accident bed mud storage pond keep in, deliver in the lump on the bank again after accidental state terminates;
(5) whole dredging engineering terminates and after acceptance(check), removes unit cofferdam, section cofferdam, diversion channel, river bottom mud storage pond and accident bed mud storage pond;
(6) before the bed mud after dredging processes disposal on the bank, room is detected and is analyzed and field pilot test first by experiment, determines the content situation of heavy metal in the size distribution situation of bed mud and different-grain diameter bed mud after the dredging of target section; Then process respectively by following situation:
Bed mud for being dug out by geotechnological machinery in step (4):
1. when the massfraction that the particle diameter wherein contained is greater than the cobble of 4.75mm is more than or equal to 10%, adopt river drip washing, analysis heavy metal content is detected to the cobble washed out or rubble, if heavy metal content exceeds standard, then add chemical leaching liquid, chemical leaching is carried out to bed mud, until the heavy metal in the cobble washed out or rubble meets building materials use standard, outward transport recycling;
2. the massfraction being greater than the cobble of 4.75mm when the particle diameter wherein contained is less than 10%, and in bed mud, particle diameter is massfraction that the coarse sand of 1.18mm ~ 4.75mm and particle diameter are greater than the cobble of 4.75mm when being less than 10%, then make bed mud directly carry out modifier treatment;
3. the massfraction being greater than the cobble of 4.75mm when the particle diameter wherein contained is less than 10%, and particle diameter is that massfraction that the coarse sand of 1.18mm ~ 4.75mm and particle diameter are greater than the cobble of 4.75mm is when being more than or equal to 10% in bed mud, then river drip washing is adopted to bed mud, analysis heavy metal content is detected to the cobble washed out and coarse sand, if heavy metal content exceeds standard, then chemical leaching is carried out to bed mud, until the heavy metal in the cobble washed out and coarse sand meets building materials use standard, outward transport recycling; Bed mud after washed-out sand process carries out modifier treatment;
(7) for the bed mud in step (6) after drip washing process:
1., when coarse sand massfraction is wherein less than 10%, directly modifier treatment is carried out;
2. when coarse sand massfraction is wherein more than or equal to 10%, river drip washing is adopted to bed mud, analysis heavy metal content is detected to the coarse sand washed out, if heavy metal content exceeds standard, then chemical leaching is carried out to bed mud, until the heavy metal in the coarse sand washed out meets building materials use standard, outward transport recycling; Bed mud after drip washing carries out modifier treatment.
(8) the temporary bed mud of the bed mud that obtains and accident bed mud storage pond is washed away in step (4) through high-pressure hydraulic, be pumped on the bank, carry out drip washing process according to the process of step (6) and step (7), or directly carry out modifier treatment;
(9) mud after modifier treatment carries out muddy water precipitate and separate;
(10) for the supernatant liquor after step (9) precipitate and separate, process respectively by following situation:
1. meet emission standard not containing leacheate, directly to discharge;
2. do not meet emission standard not containing leacheate, process rear discharge up to standard;
3. containing chemical leaching liquid, do not possess leacheate recovery value, but meet emission standard, directly discharge;
4. containing chemical leaching liquid, do not possess leacheate recovery value, but do not meet emission standard, process rear discharge up to standard;
5. containing chemical leaching liquid, possess leacheate recovery value, process; Leacheate after process meets and recycles requirement, recycles; Leacheate after process can not meet service requirements, but the requirement of satisfied discharge water body, water body near direct draining; Leacheate after process can not meet service requirements, can not meet again discharge water body requirement, carry out processing rear qualified discharge;
(11) mud after step (9) precipitate and separate is processed respectively by following situation:
1., when the massfraction being fine sand and the cobble do not screened out and coarse sand in 0.075mm ~ 1.18mm when the particle diameter wherein contained is more than or equal to 10%, centering fine sand and cobble and coarse sand screen out; Analysis heavy metal content is detected to the cobble sifted out, coarse sand and middle fine sand, if heavy metal content meets building materials use standard, direct outward transport recycling, if heavy metal content exceeds standard, then carry out stabilizing treatment by stablizer to bed mud, after the bed mud after stable meets relevant disposal standard, outward transport is rationally disposed;
2. in wherein containing, the massfraction of fine sand and the cobble do not screened out and coarse sand is less than 10%, and in bed mud, particle diameter is the thick mud of 0.020mm ~ 0.075mm and the massfraction of middle fine sand, cobble and coarse sand when being less than 10%, carries out solid-liquid separation;
3. in wherein containing, the massfraction of fine sand and the cobble do not screened out and coarse sand is less than 10%, but when in mud, the massfraction of thick mud, middle fine sand, cobble and coarse sand is greater than 10%, thick mud is wherein screened out, analysis heavy metal content is detected to the thick mud sifted out, if outward transport is rationally disposed after meeting relevant disposal standard, mud under sieve carries out solid-liquid separation, if heavy metals exceeding standard, then carry out stabilizing treatment by stablizer to bed mud, after the bed mud after stable meets relevant disposal standard, outward transport is disposed;
(12) for the mud after solid-liquid separation, nurse one's health by adding flocculation agent; For the supernatant liquor after solid-liquid separation, then process respectively by following situation:
1. in supernatant liquor not containing stablizer, and meet emission standard, directly discharge;
2. in supernatant liquor not containing stablizer, but do not meet emission standard, process rear discharge up to standard;
3. in supernatant liquor containing stablizer, do not possess stablizer recovery value, but meet emission standard, directly discharge;
4. in supernatant liquor containing stablizer, do not possess stablizer recovery value, but do not meet emission standard, process rear discharge up to standard;
5. in supernatant liquor containing stablizer, possess stablizer and to reclaim service requirements, recycle;
(13) mud after conditioning adopts mechanical dewatering equipment to dewater;
Supernatant liquor for after dehydration:
1. in supernatant liquor not containing stablizer, and meet emission standard, directly discharge;
2. in supernatant liquor not containing stablizer, but do not meet emission standard, process rear discharge up to standard;
3. in supernatant liquor containing stablizer, do not possess stablizer recovery value, but meet emission standard, directly discharge;
4. in supernatant liquor containing stablizer, do not possess stablizer recovery value, but do not meet emission standard, process rear discharge up to standard;
5. in supernatant liquor containing stablizer, possess stablizer and to reclaim service requirements, recycle;
Mud cake for after dehydration:
1. as the bed mud after dehydration meets the standard-required in ultimate disposal place, directly outer running is rationally disposed;
2. as the bed mud after dehydration directly can not meet the standard-required in ultimate disposal place, then make water ratio meet the stirring of follow-up stable curing and require laggard line stabilization solidification treatment;
(14) bed mud after dehydration and stabiliser solution carry out abundant mix and blend reaction, and carry out stable curing process, the bed mud after stable curing process should meet the standard-required in ultimate disposal place.
2. the dredging of seasonal stream heavy metal polluted bed mud and a dystopy governing system, comprises bed mud in river dredging system and sludge handling system two portions on the bank, it is characterized in that:
Bed mud in river dredging system comprises river bottom mud storage pond, accident bed mud storage pond, mud lift pump and accident mud lift pump, river bottom mud storage pond comprises mud inlet end, overcurrent gallery and mud outlet end successively, mud inlet end is provided with at least one screen cloth, mud outlet end is provided with collection mud pit, collection is provided with bed mud mud lift pump in mud pit, installation accident mud lift pump in accident bed mud storage pond, bed mud mud lift pump and accident mud lift pump all mix modified pond by pipeline with the roller-type stone washing machine in sludge handling system on the bank or mud and are connected;
Sludge handling system comprises roller-type stone washing machine on the bank, collection mud sump, screw sand washer, the molten medicine device of leacheate, ring waste reaction tank, leacheate precipitation pond for recovering, mud mixes modified pond, mud settling sump, vibratory screening apparatus, hydrocyclone, mud concentration basin, mud conditioner, mechanical dewatering equipment, stable curing whipping device, tail water chemical reaction pond, tail water chemical precipitation pond, the molten medicine device of flocculation agent and the molten medicine device of stablizer; All molten with the leacheate medicine device of roller-type stone washing machine and screw sand washer is connected; Roller-type stone washing machine is connected with collection mud sump; Collection mud sump is connected with screw sand washer by the lift pump set within it; Screw sand washer, mud mix modified pond, mud settling sump, ring waste reaction tank and leacheate precipitation pond for recovering be connected successively; Mud settling sump is connected with ring waste reaction tank; Mud settling sump is connected with vibratory screening apparatus by the lift pump set within it, and vibratory screening apparatus is connected with hydrocyclone by lift pump, and hydrocyclone, mud concentration basin, mud conditioner, mechanical dewatering equipment are connected successively with stable curing whipping device; Mud concentration basin, tail water chemical reaction pond are connected successively with tail water chemical precipitation pond; The molten medicine device of stablizer is connected with vibratory screening apparatus; The molten medicine device of flocculation agent is connected with sludge conditioning pond.
3. seasonal stream heavy metal polluted bed mud dredging according to claim 2 and dystopy governing system, is characterized in that, the degree of depth of the overcurrent gallery in described river bottom mud storage pond is no more than 0.5m, and the gradient is not less than 0.1%.
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