CN105692905B - A kind of land disposal method and device of ecotype landscape water body - Google Patents
A kind of land disposal method and device of ecotype landscape water body Download PDFInfo
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- CN105692905B CN105692905B CN201510627571.2A CN201510627571A CN105692905B CN 105692905 B CN105692905 B CN 105692905B CN 201510627571 A CN201510627571 A CN 201510627571A CN 105692905 B CN105692905 B CN 105692905B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
本发明公开了一种生态型景观水体的土地处理方法，具体来说是受污染景观水体的地下渗滤处理方法。景观水由泵抽送到地下渗滤系统，在填料、微生物和植物的复杂物理、化学和生物作用下得到净化，最后输送回景观水体。本发明同时公开了实现上述方法的装置。该装置由布水系统、地下渗滤系统和集水系统组成：在土地上挖沟槽，上部设置布水管，下部设置集水管，内部填充分层填料，沟槽的布水管正下部设有配水槽，最上层铺设自然土壤，种植植被。本发明扩大了土地处理方法的适用范围，工艺简单，不产生二次污染，属于低能耗、低污染、低排放的生态低碳型的环保技术。
The invention discloses a land treatment method for ecological landscape water bodies, in particular an underground infiltration treatment method for polluted landscape water bodies. Landscape water is pumped to the underground infiltration system, purified under the complex physical, chemical and biological action of fillers, microorganisms and plants, and finally transported back to the landscape water body. The invention also discloses a device for realizing the above method. The device consists of a water distribution system, an underground infiltration system and a water collection system: a trench is dug on the ground, a water distribution pipe is set in the upper part, a water collection pipe is installed in the lower part, and the interior is filled with layered fillers. , the top layer is laid with natural soil and planted with vegetation. The invention expands the applicable scope of the land treatment method, has simple process, does not produce secondary pollution, and belongs to an ecological and low-carbon environmental protection technology with low energy consumption, low pollution and low emission.
Description
Technical field
The invention belongs to landscape water body processing technology field, in particular to a kind of land disposal method of environmental landscape water body
And device.
Background technique
Currently, landscape water body has become the important component of urban landscape, water scenery plays the harmonious development in city
Very important status.But since landscape water is mostly static or poor fluidity closing slow flow water bodies, generally there is waters face
The features such as product is small, easy to pollute, environmental capacity of water is small and water body self-purification ability is poor causes suspended matter in water to increase, turbidity increase, have
Machine object increases and occurs eutrophication, not only influences the beauty of landscape water body, but also affects people's lives and health,
Substantially reduce society and the environmental value of landscape water body.
Currently, existing landscape water body purification techniques includes physical method, chemical method and bioanalysis three categories both at home and abroad.
Common physical method has the methods of Dredged bed mud, water diversion and renewal, coagulating sedimentation, watercourse aeration, dispensing sterilization.
Dredged bed mud: contain the polluters such as a large amount of organic matter, nitrogen, phosphorus, heavy metal in bed mud.On the one hand, work as bed mud
When anaerobic fermentation, black and odorous water can be made；On the other hand, in muddy water interface, there can be water pollutant and be deposited on bed mud and bottom
Pollutant parses the dynamic equilibrium of diffusion into water body in mud, therefore, removes underwater mud, can cut down water body contaminating endogenous object
Burst size, while also can reach increase storage capacity purpose.
Water diversion and renewal: when the suspended matter (such as mud, sand) in water body increases, the transparency decline of water body can when water quality dulling
The concentration of impurity is reduced in the method by water diversion and renewal.But there must be enough clean water source conducts in this way
Guarantee, in addition the cost for changing water is relatively high, and be easy to cause environmental pollution.Therefore only just considering in the case where small water should
Method.
Coagulant sedimentation: the process object of this method is suspended matter and colloidal impurity in water, can also remove algae.Such as it is sunk with quiet
When pond handles Times's river water, average alga-killing rate is 59%.Coagulant sedimentation has small investment, Operation and maintenance convenience, effect
It the features such as good, can be used for the processing containing a large amount of suspended matters, algae water, preferable clean-up effect can be obtained to contaminated water body.
Watercourse aeration: refer to and artificial aeration's reoxygenation is carried out to improve the dissolved oxygen content in water to water body, keep it
Oxygen condition, the method for preventing black and odorous water.Watercourse aeration is the common water quality maintaining method of landscape water body, and oxygenation mode has directly
River bed stringing aeration mode and mechanical stirring aeration mode, such as waterfall, drop, water spray can combine operation with landscape.
Research shows that pure oxygen aeration can reduce the organic pollutant of water body in a relatively short period of time, Dissolved Oxygen in Water concentration and increasing are improved
Strong water body self-purification ability reaches the good effect for improving quality of water environment.
Dispensing sterilization: the method that algae-inhibiting agent is a kind of easy, emergency control wawter bloom is added to water body, can be obtained short-term
Effect, common algicide has copper sulphate and simazine etc..When algicide and flocculant are used in combination, algae can be accelerated
Aggregate and precipitate.It is worth noting that, chemical algae removing agent has certain side effect, should cautiously be used according to the functional requirement of water body.
The above physics, chemical method are effective, but costly.
Biological method mainly has: artificial swamp, biological floating island and biological grid etc..
A kind of Artificial Wetland Techniques: bioremediation technology between terrestrial ecology and aquatic ecological.It will be contaminated
In the water body wetland that controlledly dosing has the limnocryptophytes such as reed, cattail to growth, or on the certain area in water body basin
The various water plants with water body purification function are planted, are allowed to often in saturation state, water body is flowing in a certain direction
In the process, it is purified by the effect of water resistant plant and soil.Wetland method secondary pollution is few, and landscape effect is obvious, but takes up an area
Area is larger, and can influence surrounding enviroment since mosquitos and flies breeds bring hygienic issues in summer.
Biological floating island technology: biological floating island is that water plant is cultivated on floating body, passes through the microorganism etc. on plant, root system
Nutriment and other pollutants are absorbed directly from water body, achieve the purpose that water purification.In addition, water plant formed with algae it is competing
It strives, algae can be inhibited to carry out photosynthesis, to reduce the probability of " wawter bloom " generation.Biological floating island is usually floated by frame, plant
Bed, underwater fixing device and plant composition.Artificial floating island, which has, to purify water, cuts down stormy waves, embellishing surface landscape, provides water
Raw biology inhabites space and carries out the multiple functions such as environmental education.
Biological gate technique: be using microecosystem, by creating suitable condition, promote microorganism in processing system,
Protozoan, metazoa, zoobenthos, higher plant and animal synergistic effect, reach purpose of purifying the water quality.
The theory of ecologic biological method is to restore the style of nature according to the self-law of nature, is repaired existing
There is original advantage in recovering technology.The landscape water body ecological purification method used in the present invention belongs to land disposal method.Soil
Ground processing method mainly includes five seed types such as quick diafiltration, slow rate, overland flow, wet land system and underground diafiltration.It is public
The number of opening is CN101172714A, entitled " a kind of technique for purifying water system of landscape public park ", passes sequentially through park landscape water
Setting pot, filler oxidation pond, artificial swamp, stabilization pond and sedimentation basin are purified, but its technique is excessively complicated, inconvenience management.
Publication number CN101239755A, the invention of entitled " a kind of cleaning treatment system of micro-polluted water " is similar with the present invention, ditch
Slot filler is made of the segmentation of rubble, zeolite and rubble, and water inlet pipe outlet pipe is respectively arranged at starting both ends.In these methods,
Subsurface wastewater infiltration system will not influence the environment and landscape of earth's surface, the landscape water process suitable for city and residence district.It seeps underground
Filter is by polluted water body by being embedded in the water inlet pipe dosing of underground to certain construction and filling out with good diffusion performance
In the bed of material, polluter passes through filler, microorganism and the complex biological of plant in the ecosystem, chemically and physically acts on and being divided
Solution, utilization or fixation, the resources such as organic matter, nitrogen or phosphorus are fully used in polluted water body, and water quality is purified.
This land treatment technique belongs to ecological reestablishment.It can abandon the costly of physico-chemical process purifying landscape water
The shortcomings that with secondary pollution is generated, remains to the function of playing a part of soil while purifying water, such as landscape planting,
Stress-relieving activity etc., this will preferably combine together with landscape water, construct harmonious water scenery environment.
Summary of the invention
In order to overcome the problems of the above-mentioned prior art and deficiency, the purpose of the present invention is to provide a kind of landscape water bodies
Land disposal method and device.
This method be handle pollution Landscape Water body novel process, it be mainly used in originally sanitary sewage processing and
The advanced treating of secondary urban sewage.It therefore, is a kind of new trial using this technique purification natural landscape water body.It has energy
It consumes low, is easily managed, the features such as construction cost and low operating cost, and negative impact not will cause to ambient enviroment, accord with
The low-carbon economy theory and sustainable development idea advocated now are closed, while the nutrition such as the pollutants such as COD, SS and nitrogen phosphorus can be strengthened
The degradation of substance improves pollutant removal.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of land treatment device of landscape water body: digging groove (1) first on selected soil, groove (1) with brick and
At Anti-seeping technology, interior paving HDPE antiseepage film (2) are made in groove inside.Trench interiors filling layering filler (7), on the top of groove
It is arranged water distributor (6), collector pipe (3) are arranged in lower part, and water distributor positive bottom is equipped with water distributing trough (4), and water distributor upper part is equipped with Buddhist nun
Imperial net (8), top layer are laid with natural soils (9), plant vegetation (10).Landscape water inputs groove, perforated water distribution by water inlet pipe
Pipe and after water distributing trough evenly distributes, by being layered the capillarity of filler, water is infiltrated around, is spread, filler, microorganism and
Purification is finally obtained under the complicated physics of plant, chemistry and biological effect.
The water distribution system includes water distributor (6) and water distributing trough (4), and the water distributor is perforation water distributor, the water distribution
The cross section of slot is semicircle, and filler is gravel (5).
The groove (1) of the subsurface wastewater infiltration system is formed by brick, and cross section is rectangle.
The ditch slot packing (7) of the subsurface wastewater infiltration system is layering filler, from top to bottom successively are as follows: building yellow sand, iron
Carbon filling material, gravel.
The collecting system includes collector pipe (3) and wet well, and the collector pipe is perforated catchment pipe.
The water inlet pipe upper part is equipped with nylon wire (8), is laid with natural soils (9) on nylon wire, plants vegetation (10).
HDPE antiseepage film (2) are laid on the inside of the groove (1).
After pending water enters groove by water inlet pipe, by the retention of water distributing trough cobble-stone, most of particulate matter in water
It is removed.With the accumulation of suspended matter, and anaerobic reaction occurs in water distributing trough, is degraded to larger molecular organics in suspended matter
Small organic molecule is conducive to the progress of subsequent aerobic reaction.After water distributing trough water distribution, by the capillarity of filler around,
Pending water, which is inhaled into, to be around layered in filler, and by the interception of filler, suction-operated, the particulate matter in water is further obtained
Abatement；Simultaneously by filling adsorption.The microorganism adsorption that is attracted in the biomembrane that the pollutant of filler surface is formed and point
Solution；Along with being divided into iron charcoal new packing in the middle part of layering filler, the Zero-valent Iron in iron-carbon filling material be immersed in water can constitute it is countless
Primary battery, iron are anode, and the carbon and other impurities in filler are cathode, accelerate the corrosion of iron, release more electronics, are promoted
Into reduction of the oxidizing substance on cathode.Polluted scenic waters pollutant is filled out in filling adsorption, microbial degradation and iron charcoal
Under material filtering, the comprehensive function of redox, purification is finally obtained.
Compared with existing physics and chemical method purifying landscape water, the invention has the following advantages that
(1) the features such as low energy consumption, construction cost and all low operating cost, and not will cause negative shadow to ambient enviroment
It rings, the degradation of the nutriments such as the pollutants such as COD, SS and nitrogen phosphorus can be strengthened, improve pollutant removal.
(2) the invention belongs to the scopes of underground filtration process technology, therefore not will cause big influence to ambient enviroment, together
When take full advantage of existing soil, alleviate the nervous situation of land use.
(3) device is placed in river bank, and system top can plant the flowers and plants beautified the environment, and does not influence the benefit in soil
With, moreover it is possible to certain catharsis is played to landscape water.
(4) requirement due to this technology to management is lower, does not need to build dedicated administrative staff office, therefore have
Manageable advantage.
(5) this technology capital cost is cheap, and operation and maintenance cost saves；Small, the winter operation by such environmental effects such as temperature
Stablize.
Detailed description of the invention
Fig. 1 is the process flow chart of the land treatment systems landscape water of the embodiment of the present invention.
Fig. 2 is the structural schematic diagram of land treatment device used in the embodiment of the present invention.
In Fig. 2: 1. grooves, 2.HDPE antiseepage film, 3. perforated catchment pipes, 4. water distributing troughs, 5. gravels, 6. perforation water distributors,
7. being layered filler, 8. nylon wires, 9. natural soils, 10. vegetation.
Specific embodiment
Landscape water body processing method proposed by the invention is as shown in Fig. 1, first by polluted scenic waters by into
Water pipe enters land treatment device, and then water is evenly distributed into water distributing trough by perforation water distributor, by the hair for being layered filler
Spy uses, and water uniformly diffuses in filler ambient enviroment, by the purification of filler, is discharged water in wet well by collector pipe collection,
Finally it is recycled in landscape water body by suction pump.Inventor establishes a landscape water using the present invention in Shanghai City Chongming area
Land treatment device.
1, water distribution system
Contaminated landscape water is directly extracted to water distribution system with pump.Grid is set before the drinking-water pipe of pump, is removed coarse
Impurity.Water by perforation water distributor (6) water distribution, can along journey equably dosing in water distributing trough (4).Valve is arranged in water distributor
Door and flowmeter to control flow keep system Inlet and outlet water constant.Under the capillarity of the filler gravel in water distributing trough (4), water
It is directed to surrounding, into subsurface wastewater infiltration system.
2, subsurface wastewater infiltration system
Subsurface wastewater infiltration system is used as filler using layering filler (system builds yellow sand, iron-carbon filling material, gravel from top to bottom)
(7), fill source is extensive, cheap.Landscape water carries out sub-distribution again under the capillarity of layering filler, makes system loading
Tend to be uniform.Suspended matter during diafiltration in landscape water is reduced, the dirt in water due to being layered the crown_interception of filler
Substance is contaminated to filter and adsorb, under biomembrane absorption and biodegrade, the redox comprehensive function of iron-carbon filling material in filler
It is cut down.
3, collecting system
It is collected and is discharged into out by the perforated catchment pipe (3) under groove (1) by the landscape water of subsurface wastewater infiltration system
In well, then landscape water body sent back to by pumping.
The setting water intaking hole at system flowing water Valve, is used as water analysis and samples.
Measurement result shows that after system processing, the removal effect of the various indexs of landscape water body is all apparent.Especially
It is and the organoleptic indicator of landscape water body close relation includes that coloration and turbidity are all greatly improved, while organic matter, nitrogen
There has also been very high removal rates with the nutrients such as phosphorus.
Claims (6)
1. a kind of land treatment device of ecotype landscape water body, it is characterised in that: the device is by water distribution system, underground diafiltration system
System and collecting system composition, digging groove (1) on selected soil, groove are formed with brick, make Anti-seeping technology on the inside of groove (1)；
The water distribution system includes the water distributing trough (4) of perforation water distributor (6) and setting in perforation water distributor (6) positive bottom, water distribution of perforating
It manages (6) setting and gravel filling is set in the top of groove (1), the water distributing trough；
The subsurface wastewater infiltration system is to be filled in the internal layering filler (7) of groove (1), and the layering filler (7) is from top to bottom
It is followed successively by building yellow sand, iron-carbon filling material and gravel；
The collecting system includes collector pipe (3), and collector pipe (3) is arranged in the lower part of groove (1)；
The upper part of perforation water distributor (6) is equipped with nylon wire (8), and the upper part of nylon wire (8) is laid with natural soils (9),
The upper part of natural soils (9) plants vegetation (10)；
Landscape water inputs groove by water inlet pipe, after perforated water distributor (6) and water distributing trough (4) evenly distribute, by being layered filler
Capillarity, infiltrate, spread around, it is final under the complicated physics, chemistry and biological effect of filler, microorganism and plant
It is purified.
2. land treatment device according to claim 1, it is characterised in that: the cross section of the water distributing trough (4) is semicircle
Shape.
3. land treatment device according to claim 1, it is characterised in that: the cross section of the groove (1) is rectangle.
4. land treatment device according to claim 1, it is characterised in that: the collecting system include collector pipe (3) and
Wet well, the collector pipe (3) are perforated catchment pipe.
5. land treatment device according to claim 3, it is characterised in that: be laid with HDPE antiseepage film on the inside of groove (1)
(2)。
6. a kind of land disposal method using any land treatment device of Claims 1 to 55, comprising the following steps:
Step 1: contaminated landscape water is sent by pumping to water distribution system, and the water distribution system includes perforation water distributor (6) and sets
The water distributing trough (4) in perforation water distributor (6) positive bottom is set, contaminated landscape water perforated water distributor (6) penetrates into water distributing trough (4)
In；Top of perforation water distributor (6) setting in groove (1)；
Step 2: after water distributing trough (4) evenly distributes, contaminated landscape water permeates the ground filtration system；
Step 3: it is collected and is discharged into wet well by the collector pipe of lower trench by the landscape water of subsurface wastewater infiltration system, then
Landscape water body is sent back to by pumping.
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| CN201510627571.2A CN105692905B (en) | 2015-09-29 | 2015-09-29 | A kind of land disposal method and device of ecotype landscape water body |
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| CN201510627571.2A CN105692905B (en) | 2015-09-29 | 2015-09-29 | A kind of land disposal method and device of ecotype landscape water body |
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| CN105692905A CN105692905A (en) | 2016-06-22 |
| CN105692905B true CN105692905B (en) | 2019-01-04 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105948270B (en) * | 2016-07-07 | 2024-12-24 | 厦门市优九生态科技有限公司 | A natural water body ecological restoration method and restoration system |
| CN106007260A (en) * | 2016-07-29 | 2016-10-12 | 江苏华亿天地环境科技有限公司 | Anti-blocking and anti-short flow micro-pollution water land treatment system with reoxygenation function |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1405096A (en) * | 2002-09-23 | 2003-03-26 | 清华大学 | Intensified water-layout underground infiltration water treatment method and system |
| CN101239755A (en) * | 2007-02-06 | 2008-08-13 | 苏州工业园区活水生态科技有限公司 | Purifying treatment system for micro-polluted water |
| CN102079579A (en) * | 2009-11-26 | 2011-06-01 | 宝山钢铁股份有限公司 | Artificial wetland with combined fillers and treating process thereof |
| CN103030247A (en) * | 2011-10-09 | 2013-04-10 | 中国环境科学研究院 | Method for treating sewage by organism-soil infiltration and device for realizing method |
| CN104150704A (en) * | 2014-07-25 | 2014-11-19 | 中国环境科学研究院 | Treatment device and treatment method for sewage treatment and reclamation |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6277274B1 (en) * | 1999-04-16 | 2001-08-21 | Larry Steven Coffman | Method and apparatus for treating stormwater runoff |
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- 2015-09-29 CN CN201510627571.2A patent/CN105692905B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1405096A (en) * | 2002-09-23 | 2003-03-26 | 清华大学 | Intensified water-layout underground infiltration water treatment method and system |
| CN101239755A (en) * | 2007-02-06 | 2008-08-13 | 苏州工业园区活水生态科技有限公司 | Purifying treatment system for micro-polluted water |
| CN102079579A (en) * | 2009-11-26 | 2011-06-01 | 宝山钢铁股份有限公司 | Artificial wetland with combined fillers and treating process thereof |
| CN103030247A (en) * | 2011-10-09 | 2013-04-10 | 中国环境科学研究院 | Method for treating sewage by organism-soil infiltration and device for realizing method |
| CN104150704A (en) * | 2014-07-25 | 2014-11-19 | 中国环境科学研究院 | Treatment device and treatment method for sewage treatment and reclamation |
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