A kind of channel cleanout method
Technical field
The present invention relates to the dredging fields of water bottom deposition, and in particular to a kind of channel cleanout method.
Background technique
Important component of the urban river as town ecosystem not only has and provides water source, traffic shipping and prevent
The functions such as flood water drainage, also have and regulate the climate and cut down the Impacts on ecology and environment such as pollution.However, with society development with into
Step, riverway sludge problem have become the outstanding problem in city river: the siltation of silt particle, rubbish in river affects river
Flood passage and landscape;A large amount of polluted bed muds have an adverse effect to water correction and ecological recovery;River surface layer Mud Layer is low
The time of tide easily floating forms black water band, and sludge and rubbish expose the surface in the time of low water on the high beach in two sides, is repugnant to the eye, and destroys scape
It sees, therefore, channel cleanout work is most important to enhancement of environment, urban construction.
Geotextile tube bag is a kind of pipe made of high strength geotextile with some strength, the filtration of ductility
Strip material, geotextile tube bag are used primarily in embankment engineering, have been applied to the necks such as environmental protection, lake and reservoir dredging at present
Domain.
CN101774745A discloses a kind of geotube and dewatering for sludge dewatering, passes through dedicated mud
Pumping system charges mud into storage silt bag, after pipe bag is full of sealing, electrode is accessed constant voltage dc source, starts to be dehydrated, benefit
With gravity, the triple role of pipe bag wall pressure and electric osmose, the moisture in mud collects the filtering with bag wall by cathode and quickly arranges
It removes, the mud in bag becomes the plastic body with certain shearing strength from fluid, by opening the seam of pipe bag wall, will complete de-
The plastic state mud of water takes out, and realizes sludge treatment.CN105000787A discloses a kind of mud dredging bag and mud dredging side
Method carries out dredging, specific steps are as follows: will contain water slurry and pass through slush pump using the mud dredging bag made of geotechnological ecological film
It pumps out, is pumped into dredging bag after adding coagulant, under the action of volatilization and gravity or addition pressure, realize the dry of sludge
Change.After this method is dehydrated, moisture percentage in sewage sludge can be reduced to 70% or so, Jing Yizhou be exposed to the sun and natural air drying, sludge contain
Water rate can be further decreased to 50% or so, reach the processing capacity of common sludge drying equipment, and have low, the saving fortune that consumes energy
The advantages that row cost.
The method that general common channel cleanout is taken at present is: it is dredged with digging machine, is then dug out mud with ship first,
Then mud is placed in cofferdam and entrucked and carried away after natural drying and filled, the method for this channel cleanout there are the problem of
It is mud to be placed in cofferdam to dry first, needs to take over for use large area soil, followed by generates a large amount of reflux sewage, lead to two
Secondary polluted river water, while pollutant is evaporated in air and will affect ambient enviroment during mud sunning.
CN105399290A discloses a kind of rural area channel cleanout construction method, comprising the following steps: a. mud excavates: logical
The bagger with cutting head and pump is crossed, wherein cutting head is placed into the mud in river, and then bagger starts to Forward
Dynamic, cutting head incision mud simultaneously conveys mud into pump;B. convey: pump water is sucked together with mud wherein, mud with
It is admitted in river bank buffer pool by mud conveying pipeline afterwards;C. deodorized and solidified: added in buffer pool deodorant and curing agent into
Row solidification, deodorizing process;D. the mud after deodorization, curing process is injected into ecological pipe bag by pipeline using pump, utilizes life
State pipe bag mud self weight solidified, precipitated, draining filter one month, finally by the mud after dehydrating and curing be used as slope protection,
Landfill or outward transport.The invention changes traditional unlimited extensive style dredging method, is dehydrated using ecological pipe bag, avoids mud and dry in the air
Problem of environmental pollution caused by solarization, and mechanical dehydration is compared, cost is lower.
But due to geotextile tube bag filling to a certain extent after, pipe bag surface by tiny sand grain formed " filter cake is thin
Layer " is covered, and is hindered the further exudation of pipe water-in-bag point, is led to the permeable low efficiency of pipe bag.Simultaneously because geotextile tube bag
Interior moisture content is uneven, and bed mud is caused to be difficult to realize resource reutilization.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of channel cleanout method, which passes through to mud
Pretreatment, improve the dehydration efficiency of geotextile tube bag, strong operability, occupied area are small, at low cost, without secondary pollution to ask
Topic.
To achieve the goals above, the invention adopts the following technical scheme:
A kind of channel cleanout method, comprising the following steps:
(1) mud conveys: water is transported in river bank buffer tank together with mud, is uniformly mixed, obtains mud;
(2) be ultrasonically treated: the mud obtained to step (1) is ultrasonically treated, and obtains slurry liquid;
(3) silt particle separates: the slurry liquid that step (2) is obtained carries out air-flotation process, obtains heavy gravel and lightweight mud;
Heavy gravel is cleaned using river raw water, obtains gravel and cleaning solution;
(4) geotextile tube bag is dehydrated: lightweight mud and the cleaning solution mixing that step (3) is obtained are added flocculant, stand
Afterwards, supernatant is removed, deposition liquid is obtained, after diatomite and modifying agent is added into deposition liquid, improvement liquid is obtained, improvement liquid is blown
Solidification dehydration is carried out in filling geotextile tube bag, finally using mud after dehydrating and curing as resource reclaim.
It preferably, before the step (1), further include the impaired analysis in river: pollutant in detection river water body and bed mud
Type and content, determine the depth of dredging.
Preferably, the solid content of mud described in step (1) is 10-15%.
Preferably, described in step (2) ultrasonic treatment be the supersonic frequency be 20-50kHz, ultrasonic intensity 20-
75W/cm2, the processing time is 5-10min.
Preferably, flocculant and/or flocculation aid are not added during air-flotation process described in step (3).
Preferably, air-flotation process described in step (3) are as follows: operating pressure 0.3-0.6MPa, reflux ratio 8-15% scrape slag week
Phase 0.2-0.5h.
Preferably, the aperture of geotextile tube bag described in step (4) is 0.1-0.3mm.
Preferably, flocculant described in step (4) is chitosan and poly-iron chloride, and the additive amount of the flocculant is described
The 0.05-0.1% of lightweight mud quality.
Preferably, the additive amount of diatomite described in step (4) is the 0.1-0.2% of the deposition liquid quality.
Preferably, the additive amount of modifying agent described in step (4) is the 0.05-0.1% of the deposition liquid quality.
Preferably, the modifying agent is any one of ethylenediamine tetra-acetic acid, citric acid, malic acid and humic acid.
The invention has the benefit that
(1) present invention is combined using ultrasonic treatment and air bearing, realizes the separation of mud and sandstone, and gravel returns to river
Road, for river reparation after dredging, while the treating capacity for decreasing mud reduces production cost.
(2) present invention pre-processes lightweight mud by addition diatomite and modifying agent, effectively prevents filling
Tiny sand grain forms " filter cake thin layer " on pipe bag surface in journey, improves dehydration efficiency of the geotextile tube bag from heavy filtration.
(3) consistency of the moisture content of pipe bag mud produced by the present invention is high, and being used directly for planting soil realizes bottom
The resource reutilization of mud.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below to technical solution of the present invention
It is further described.The present invention is not specifically limited to the source of used chemical reagent, is common commercially available product.Described
Diatomite is that partial size is 0.1mm, and the geotextile tube bag is high-strength high filter polypropylene geotextile pipe bag.
A kind of channel cleanout method, comprising the following steps:
(1) mud conveys: water is transported in river bank buffer tank together with mud using pump, is uniformly mixed, consolidate
Content is the mud of 10-15%;
(2) be ultrasonically treated: the mud obtained to step (1) is ultrasonically treated, and obtains slurry liquid;The supersonic frequency is
20-50kHz, ultrasonic intensity 20-75W/cm2, the processing time is 5-10min;
(3) silt particle separates: the slurry liquid that step (2) is obtained carries out air-flotation process, obtains heavy gravel and lightweight mud;
Heavy gravel is cleaned using river raw water, obtains gravel and cleaning solution;
Flocculant and/or flocculation aid are not added during the air-flotation process;The air-flotation process are as follows: operating pressure 0.3-
0.6MPa, reflux ratio 8-15%, scum period 0.2-0.5h;
(4) geotextile tube bag is dehydrated: lightweight mud quality is added in lightweight mud and the cleaning solution mixing that step (3) is obtained
The flocculant of 0.05-0.1% obtains deposition liquid after standing, and the silicon of deposition liquid quality 0.1-0.2% is separately added into deposition liquid
After the modifying agent of diatomaceous earth and deposition liquid quality 0.05-0.1%, improvement liquid is obtained, it is 0.1-0.3mm that improvement liquid hydraulic reclamation, which is entered aperture,
Geotextile tube bag in carry out solidification dehydration 1-3 week, finally regard mud after dehydrating and curing as resource reclaim, it is native to be used for landscape planting
With building materials etc.;
Wherein, the flocculant is the chitosan and poly-iron chloride that mass ratio is 1:1;The modifying agent is ethylenediamine tetrem
Any one of acid, citric acid, malic acid and humic acid.
Preferably, the invention also includes the impaired analyses in river: detecting the type of pollutant in river water body and bed mud and contains
Amount, determines the depth of channel cleanout;Wherein, the sampled point depth of bed mud is respectively 5-10cm, 15-20cm and 25-35cm.
Meanwhile step (3) of the present invention obtain grit, step (4) stand after supernatant and geotextile tube bag filter liquor
River is returned to, for the reparation in dredging river, reduces dredging cost.
Embodiment 1
A kind of channel cleanout method, comprising the following steps:
(1) mud conveys: water is transported in river bank buffer tank together with mud using pump, is uniformly mixed, consolidate
The mud that content is 10%;
(2) be ultrasonically treated: the mud obtained to step (1) is ultrasonically treated, and obtains slurry liquid;The supersonic frequency is
20kHz, ultrasonic intensity 20W/cm2, the processing time is 10min;
(3) silt particle separates: the slurry liquid that step (2) is obtained carries out air-flotation process, obtains heavy gravel and lightweight mud;
Heavy gravel is cleaned using river raw water, obtains gravel and cleaning solution;
Flocculant and/or flocculation aid are not added during the air-flotation process;The air-flotation process are as follows: operating pressure
0.3MPa, reflux ratio 8%, scum period 0.2h;
(4) geotextile tube bag is dehydrated: lightweight mud quality is added in lightweight mud and the cleaning solution mixing that step (3) is obtained
0.05% flocculant obtains deposition liquid after standing, and the diatomite of deposition liquid quality 0.1% and heavy is separately added into deposition liquid
After the modifying agent of hydrops quality 0.05%, improvement liquid is obtained, liquid hydraulic reclamation will be improved and enter in the geotextile tube bag that aperture is 0.1mm to carry out
Solidification dehydration 3 weeks, finally carries out resource reclaim for mud after dehydrating and curing as landscape planting soil;
Wherein, the flocculant is the chitosan and poly-iron chloride that mass ratio is 1:1;It is 1 that the modifying agent, which is mass ratio:
Ethylenediamine tetra-acetic acid, citric acid and the humic acid of 1:2.
Embodiment 2
A kind of channel cleanout method, comprising the following steps:
(1) mud conveys: water is transported in river bank buffer tank together with mud using pump, is uniformly mixed, consolidate
The mud that content is 15%;
(2) be ultrasonically treated: the mud obtained to step (1) is ultrasonically treated, and obtains slurry liquid;The supersonic frequency is
50kHz, ultrasonic intensity 75W/cm2, the processing time is 5min;
(3) silt particle separates: the slurry liquid that step (2) is obtained carries out air-flotation process, obtains heavy gravel and lightweight mud;
Heavy gravel is cleaned using river raw water, obtains gravel and cleaning solution;
Flocculant and/or flocculation aid are not added during the air-flotation process;The air-flotation process are as follows: operating pressure
0.6MPa, reflux ratio 15%, scum period 0.5h;
(4) geotextile tube bag is dehydrated: lightweight mud quality is added in lightweight mud and the cleaning solution mixing that step (3) is obtained
0.1% flocculant obtains deposition liquid after standing, and the diatomite of deposition liquid quality 0.2% and heavy is separately added into deposition liquid
After the modifying agent of hydrops quality 0.1%, improvement liquid is obtained, liquid hydraulic reclamation will be improved and enter in the geotextile tube bag that aperture is 0.3mm to carry out
Solidification dehydration 2 weeks, finally carries out resource reclaim for mud after dehydrating and curing as landscape planting soil;
Wherein, the flocculant is the chitosan and poly-iron chloride that mass ratio is 1:1;It is 1 that the modifying agent, which is mass ratio:
Ethylenediamine tetra-acetic acid, citric acid and the humic acid of 1:2.
Embodiment 3
A kind of channel cleanout method, comprising the following steps:
(1) mud conveys: water is transported in river bank buffer tank together with mud using pump, is uniformly mixed, consolidate
The mud that content is 12%;
(2) be ultrasonically treated: the mud obtained to step (1) is ultrasonically treated, and obtains slurry liquid;The supersonic frequency is
35kHz, ultrasonic intensity 50W/cm2, the processing time is 6min;
(3) silt particle separates: the slurry liquid that step (2) is obtained carries out air-flotation process, obtains heavy gravel and lightweight mud;
Heavy gravel is cleaned using river raw water, obtains gravel and cleaning solution;
Flocculant and/or flocculation aid are not added during the air-flotation process;The air-flotation process are as follows: operating pressure
0.35MPa, reflux ratio 12%, scum period 0.35h;
(4) geotextile tube bag is dehydrated: lightweight mud quality is added in lightweight mud and the cleaning solution mixing that step (3) is obtained
0.08% flocculant obtains deposition liquid after standing, be separately added into deposition liquid deposition liquid quality 0.15% diatomite and
Deposit liquid quality 0.08% modifying agent after, obtain improvement liquid, will improve liquid hydraulic reclamation enter aperture be 0.2mm geotextile tube bag in into
Row solidification dehydration 1 week, resource reclaim finally was carried out using mud after dehydrating and curing as landscape planting soil;
Wherein, the flocculant is the chitosan and poly-iron chloride that mass ratio is 1:1;It is 1 that the modifying agent, which is mass ratio:
Ethylenediamine tetra-acetic acid, citric acid and the humic acid of 1:2.
Comparative example 1
This comparative example is distinguished as with embodiment 3, lacks ultrasonic treatment.
Comparative example 2
This comparative example is distinguished as with embodiment 3, and step does not add diatomite in (6).
Comparative example 3
This comparative example is distinguished as with embodiment 3, and the mass ratio of modifying agent described in step (6) is 1:2:1, diatomite
Additive amount is 0.2%.
Comparative example 4
This comparative example is distinguished as with embodiment 3, and the solid content of mud is 17% in step (1), gas described in step (3)
Floating processing are as follows: operating pressure 0.6MPa, reflux ratio 15%, scum period 0.5h.
Mud solid content after experimental example 1 solidifies
In geotextile tube bag after the completion of silt consolidation, pipe bag is dismantled, is sampled by the highl stratification of consolidation mud, measurement geotechnique
The solid content of mud in pipe bag.Wherein, A sample point is located at consolidation mud upper surface or less 5cm, and B sample point is located at consolidation mud
Horizontal center line axis at, i.e., distance consolidation mud upper surface distance be 15cm, C sample point be located at consolidation mud lower surface with
Upper 5cm.
Detection method: it weighs in the crucible that analysis sample 5-10g is contained in known weight and drying to constant weight, at 105 DEG C
Dry 4-8h to constant weight, it is cooling in dry after on assay balance accurate weighing.Calculation formula is as follows:
TS%=(W2/W1) × 100%
In formula:
TS-solid content, %
Sample quality before W1-drying, g;
Sample quality after W2-drying, g.
Table 1 curing sludge solid content (TS) data
|
ATS% |
B TS% |
C TS% |
Embodiment 1 |
53.4 |
52.6 |
51.2 |
Embodiment 2 |
53.2 |
51.5 |
50.1 |
Embodiment 3 |
53.0 |
52.9 |
52.3 |
Comparative example 1 |
52.8 |
45.0 |
35.2 |
Comparative example 2 |
50.5 |
42.4 |
31.8 |
Comparative example 3 |
50.2 |
47.5 |
38.0 |
Comparative example 4 |
45.2 |
37.8 |
30.1 |
As known from Table 1, using surface layer, middle layer and the bottom of mud after solidifying made from the embodiment of the present application 1-3 technical solution
The solid content of layer mud is not much different, and shows that the application can effectively improve the consistency of geotextile tube bag sludge dewatering, realizes solid
Change the resource utilization of mud.Meanwhile the application is effectively prevent by ultrasonic treatment, air bearing and the cooperation of diatomite and modifying agent
Geotextile tube bag surface forms " filter cake thin layer ", improves the permeable efficiency of pipe bag, shortens the time of sludge solidification.
It is in conjunction with specific embodiments to further description of the present invention above, but these embodiments are only exemplary,
It is not intended to limit the scope of the present invention in any way.It will be understood by those skilled in the art that without departing from essence of the invention
Can be with the details and forms of the technical scheme of the invention are modified or replaced under mind and range, but these modifications and replacement are fallen
Enter in protection scope of the present invention.