CN101200315A - Sediment covered restoring method for eutrophic water - Google Patents
Sediment covered restoring method for eutrophic water Download PDFInfo
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- CN101200315A CN101200315A CNA2007101911952A CN200710191195A CN101200315A CN 101200315 A CN101200315 A CN 101200315A CN A2007101911952 A CNA2007101911952 A CN A2007101911952A CN 200710191195 A CN200710191195 A CN 200710191195A CN 101200315 A CN101200315 A CN 101200315A
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Abstract
The invention relates to a sediment shielding and remediation method of eutrophic water body, which adopts the following steps: 1. the selection of shielding materials: the shielding material adopts clay; 2. the pretreatment of shielding material and additive: after smashed, all are sieved by 300 meshes, after then dried for 3h at 200 DEG C, and placed in drier for standby; 3. the pretreated shielding material is added with appropriate additive; 4. the shielding material in the step 3 is directly applied into the lake water body; 5. the shielding effect is tested; 6. according to the test result in the step 5, the amount of the shielding material is adjusted and the types or amounts of the additive is adjusted. Compared with the prior art, the invention has essential difference. In the invention suitable time is selected, the laterite and auxiliary materials are directly applied into the lake water body. Nitrogen, phosphor and other nutritious salts in the water body can be removed, simultaneously a layer of film is formed on the surface of the sediment so as to block the release of nitrogen, phosphor and other nutritious salts in the sediment and the floating and breeding of algae biology, thereby reaching the purpose of treatment.
Description
Technical field
The application relates to a kind of environmental improvement method, is specifically related to a kind of sediment covered restoring method for eutrophic water.Invention be according to the National Key Laboratory's main project comprehensive survey of the Dianchi Lake Basin water and soil resources and the ecotope " research " (numbering: 005301), project of national nature science fund project " isotope tracer studies in the Dianchi Lake Basin soil erosion and silt sediment source " (numbering: 40473052) and Yunnan Province's Bureau for Environmental Protection development in science and technology planning item " Dian Chi blue-green algae resting stage algae removal technology principle and application apparatus research " select a topic and study.
Background technology
The quickening with urbanization process and development activities of developing rapidly along with industrial or agricultural, the continuous increase of industrial and agricultural production waste water and town domestic sewage total emission volumn, and wastewater treatment rate fails to grow simultaneously, and makes the dirty load of receiving of water body increasing, and the water pollution range constantly enlarges.Since the 1950's, in the area that some are agriculture and cities and towns are highly developed, mankind's activity is frequent, the water environment capacity is more and more littler, and pollution level is serious day by day.In water resources deficient day by day today, water quality is not fundamentally reversed because of the trend that pollution constantly worsens, in the city and the environmental aspect of relevant water bodys such as suburbs rivers, Hu Ku worse and worse, the alluvial of ubiquity silt, water pollution (organic contamination, heavy metal contamination), paludification, salinization, eutrophication, acidifying and the water surface that causes are thus shunk back and eight macrohabitat problems such as the deterioration of the ecological environment, and are on the rise.Some water bodys reduce because of pollution or have lost water resources, ecological water value and hydrology function, and water resources is shortage more, seriously jeopardizes Human's production and life.In the various pollution problems of lake aquatic attitude environment, body eutrophication (Eutrophication) is that one of the most general, that harm is maximum outstanding problem takes place, influence and restricting the coordinated development of economic society, become one of the most serious main Environmental Problems that the world today faces, and more and more caused people's great attention.The pollutant holding capability of water body is big more, and pollutent sharply accumulates in water body and the bed mud, and nutrient concentration is more and more higher, and lake eutrophication is on the rise.
At present, the solution of related problems has also become the task of top priority, also is to prevent that the lake environment quality from continuing the research focus that worsens and thoroughly deal with problems.
For example, the Dian Chi is lakes, typical shallow water type outskirts of a town.For many years, taked a series of measures to administer, exogenous pollutions such as point source, face source load is controlled gradually, but the eutrophication in waters, Dian Chi and pollution process are in rising trend always.In the recent period full lake field data show, Dian Chi and pond waters alkalization are serious, and the pH value generally reaches 9.1～9.5.At present, full lake has reached heavy eutrophy-unusual nutritional status, and the most serious with annual 4～June to 8～October, and water quality is V class～bad V class, contains (Yang Wenlong etc., 1998 such as higher N, P and As, Hg, Cr in the bed mud; Three-bristle cudrania unit covers 2002; The field is peaceful etc., and 2002; Lu Yifeng etc., 2003; Chen Yongchuan etc., 2005).
When in the past native or same type of material being used for waste water or sewage disposal, allow water through the soil body often, reach the effect of decontamination, though successful examples is arranged, these class methods only are suitable for small-scale sewage disposal, are difficult to the processing of competent big area lake water.And for the lake of eutrophication, as Taihu Lake, Chaohu, Dian Chi etc., the water (if possible) that changes once is difficult to reach and administers purpose, because a large amount of nitrogen, phosphorus also can discharge from settling.
Sediment covered is to place one or more layers coverture on polluted bed mud, bed mud and water body are isolated, prevent a kind of anchored in place technology of pollutants in sediments to the water body migration, coverture commonly used has clean earth, sandy soil, gravel, aluminium salt, molysite and man-made land sill etc.A large number of experiments show that, shelter and to prevent effectively that nutritive salt in the bed mud, PAH, PCBs and heavy metal from entering water body and causing secondary pollution, the water quality effect of having clear improvement.It is advantageous that cost is low, applied widely, the environment potential hazard is little, do not increase the reparation that the depth of water promptly can be aquatic vegetation fine growing environment etc. is provided, and settling oxidation and chemical precipitation etc. can not suppress the situation that endogenous phosphorus discharges when being suitable for water pH value higher (greater than 9.0).But kind, quantity and the effect thereof of throwing in covering material rarely had careful data.Simultaneously, the research to water pollution problems at present rests on the indoor static simulated experiment often morely, the just short term effect of reflection and the result of some specified conditions.And the comparatively slowly and very complicated process of one of body eutrophication in fact.Therefore, need the lab simulation analysis to detect with test in place at present especially and combine, under the prerequisite of taking all factors into consideration the various factors variation, the long-time effect that under the treatment condition substrate sludge nutritive salt is discharged is studied, the result just has more realistic meaning.And this class achievement in research is not arranged as yet in the prior art.
Summary of the invention
The problems referred to above at prior art, the purpose of this invention is to provide a kind of sediment covered restoring method for eutrophic water, this method is to detect with test in place with the lab simulation analysis to combine, under the prerequisite of taking all factors into consideration the various factors variation, to a whole set of method that the long-time effect research that under the treatment condition substrate sludge nutritive salt is discharged obtains, use this method and can reach to reach and effect a radical cure the purpose that body eutrophication and algal tufa break out to a certain extent with simple steps and a spot of resource.
The technical scheme of finishing the foregoing invention task is: a kind of sediment covered restoring method for eutrophic water, and step is as follows:
(1), masking material chooses described masking material employing clay;
(2), the pre-treatment of masking material and additive: pulverize whole mistake 300 mesh sieves in back, and, place moisture eliminator standby through 200 ℃ of oven dry 3h;
(3), an amount of additive will be added in the pretreated masking material;
(4), the masking material that step (3) is obtained directly applies water body in lake;
(5), to the test of masking effect;
(6), adjust the add-on of masking material, and adjust additive types or quantity according to the test result of step (5).
Above clay as masking material, preferred laterite; Test is taken from the protective belt, reservoir water seedbed, Song Hua dam, Kunming with laterite, and being cultivated with artifact pollution influences.During sampling from the face of land downward cutting to the 5m depths.
The pre-treatment of described masking material is meant pulverizes whole mistake 300 mesh sieves in back, and through 200 ℃ of oven dry 3h, places moisture eliminator standby.
Described an amount of additive is meant and adds flyash or lime powder, or both mixtures; The ratio that adds is: flyash: 5～20% of masking material weight; Lime powder: 0～8% of masking material weight;
Described masking material directly applies water body in lake, and the amount of masking material is a 0.25～0.5g/ square metre of lake.
The present invention has following prioritization scheme:
A, increase following steps before in step (4):
(4)-1 pair waters that will implement to handle is carried out subregion earlier and is enclosed and block or jackstone, forms necessarily for barrier on water body bed mud top, promotes water body backflow interface, constructs the environment of a hydrodynamic condition relatively placidity in the water body bottom;
B, after (4) step, increase following steps:
(4)-3 formed tectal stablizing by making, can cover by gravel or the cobble with different-grain diameter on tectum, its thickness should depend on the circumstances, and should approach (0.5～2cm) as far as possible.
After increasing step (4)-1 respectively, or after increasing (4)-3, or after increasing step (4)-1 and (4)-3 simultaneously, step originally (4) can still be called step (4), also can be called step (4)-2.
The way that adds of C, step (4) is: broadcast sowing, once carry out.
It is excellent that D, enforcement time of the present invention should be selected in algae bio resting stage.
The solution of the present invention is actually the bed mud sealing and bed mud covers the compound of two kinds of technology, the advantage that possesses both, masking material of the present invention can be removed nutritive salt and algae bios such as nitrogen in the water body, phosphorus on the one hand, can form thin film on deposition bed mud surface on the other hand, prevent pollutent resuspending or migration, polluted bed mud and bottom-dwelling (algae etc.) physical property ground are separated, thereby the simultaneously also release of nutritive salt such as nitrogen, phosphorus and the come-up growth passage of algae bio and hatching cell thereof in the barrier deposition thing, thereby reach the purpose of eliminating algae pollution.
Recovery technique of the present invention has following advantage: technical matters is uncomplicated, and is workable; Material is easy to get, and can gather materials on the spot, and is cheap, economic and practical, suits large area to popularize; Though treatment process and equipment seem simply, core technology has innovation, administers the technical indicator height, can reach the effect that " double gain " even multiple goal are repaired; In the repair process and after, can not endanger ecosystem safety, the bed mud structure is enhanced and optimizes; Convenient management; Also can combine and carry out etc. with other restorative procedure technology.
More particularly, good result of the present invention has:
(1) control respond well that mud internal loading source, bottom of the reservior, eutrophication lake discharges with natural minerals as masking layer, nitrogen, algae are also shown processing efficiency preferably, the eutrophication trend of each examination bucket water body is step-down significantly.Wherein, laterite is effective bed mud covering material, but planktonic growth and breeding such as TP, TN and inhibition algae in the active adsorption overlying water, but to the control effect of TN a little less than TP.And the laterite consumption is not The more the better, and its influence is worth further inquiring into.
(2) add the endogenous burst size that flyash and lime powder help to subdue TP in the bed mud, TN,
Flyash can also obviously improve its controlling efficiency to plant plankton breeding such as algae and algae, frustule and embryo's thereof come-up growth, finally reaches the purpose of eliminating algae and eutrophication.From test-results, laterite adds flyash except that can effectively removing TN in the water, the TP, and is the highest to the clearance of chlorophyll a, control eutrophication best results.
(3) after testing, selected laterite, flyash, lime powder are safer, can not pollute water body to be repaired.Experimental result confirms, adds the obvious rising that lime powder not only can not cause water pH value under certain consumption condition, and effective to the control of phosphorus.
(4) in the effect simulation experiment that utilizes the examination bucket to be done, relative hydrostatic environment in the examination bucket makes water body show certain self-purification capacity and unstable, there is certain difference in the physicochemical environment of the inside and outside water body of examination bucket, but the two still has stronger comparability generally, be suitable for passing through simulated experiment, as a result the practical value height.
(5) implement in the sediment covered technical process in reality, should first-selected headwater region and eutrophication and the serious zone of sediment pollution, and subregion carries out step by step, preferably sets about from the more weak relatively placidity waters of hydrodynamic condition earlier, and then advances to the periphery.For blocking-up lake water refluxes to the disturbance of tectum and bed mud, can be to the waters that will implement to handle, carry out subregion earlier and enclose and block or jackstone, form certain every barrier on water body bed mud top, promote water body backflow interface, construct the environment of a hydrodynamic condition relatively placidity in the water body bottom.Simultaneously, formed tectal stablely by making, can be thereon cover with the gravel or the cobble of different-grain diameter, its thickness should depend on the circumstances, and should approach as far as possible.In addition, the enforcement time should be selected in algae bio resting stage and begins to excellent.
(6) present method also exist a large amount of cleaning coverture of needs, quantities big, reduce water body significant depth and storage capacity, influenced by the water body dynamic condition even chemical action can take place, should with problems such as external source Pollution control technology in other is used in combination, but the advantage of cheap natural red soil of easily getting of its utilization and industrial waste, environmental benefit height, easy construction is remarkable, both reached the good purpose of water body repairing effect, the treatment of wastes with processes of wastes against one another again, after improving, be expected to become the possible technique of a cover eutrophication water and bed mud reparation.
The covering scheme of the present invention and prior art has the difference of essence.When in the past soil or same type of material being used for waste water or sewage, allow water spread a spot of modified clay mineral through soil or direct the throwing often, reach the effect of decontamination, these class methods are suitable for small-scale sewage disposal, also obtain certain success, but be difficult to the processing of competent big area lake water.Simultaneously, for the lake of eutrophication, Dian Chi for example, changing water (if possible) and can not reach and administer purpose once is because a large amount of nitrogen phosphorus also can discharge in the settling.Therefore, this chooses the suitable time, with laterite and add an amount of subsidiary material and directly apply water body in lake, can remove on the one hand nutritive salt such as nitrogen in the water body, phosphorus, can form thin film on the bed mud surface simultaneously, release and algae bio come-up with nutritive salt such as nitrogen, phosphorus in the barrier deposition thing are bred, thereby reach the purpose of improvement.
Description of drawings
Fig. 1 is sediment covered cover butter synoptic diagram;
Fig. 2 is the general technical route of experimental study;
Fig. 3-1,3-2 are test laterite;
Fig. 4 is for supplying the isothermal adsorption curve of examination laterite samples to phosphorus;
Fig. 5 is the influence curve of laterite add-on to water systems'phosphorus concentration;
Fig. 6 be under the different concns condition laterite to the influence curve of water systems'phosphorus concentration;
Fig. 7 is the influence curve of impact strength to the solution phosphorus concentration;
Fig. 6 is the influence curve of concussion time to the solution phosphorus concentration;
Fig. 7 is the change curve of different pH condition laterite to the absorption of solution phosphorus;
Fig. 8 covers the change curve of water-soluble attitude phosphorus concentration in the preliminary experiment for laterite;
Fig. 9 covers the change curve of total phosphorus concentration in the preliminary experiment for laterite;
Figure 10 covers structural representation for gravel or cobble.
Embodiment
Embodiment 1, with reference to Fig. 2, and the Kunming Dianchi lake sediment covered restoring method for eutrophic water, through examination and preferred on the spot, it be in the adjacent lake water pool near the eastern bank in Dian Chi, to be positioned at Dou Nan town, Chenggong County, Kunming plum village Xi1kmChu that this selected field condition is repaired place.
Method and process:
(1), choosing of masking material:
Preferred local laterite, laterite are to pick up from Reservoir region east side, Song Hua dam, Kunming, Yunnan Province respectively in October, 2002 (25 ° of 07 ' N in 102 ° 39 ' E) and the white clay mountain, Kunming (with reference to Fig. 3-1,3-2), are the natural weathering laterite that does not suffer artificial disturbance.During sampling from the face of land downward cutting to the 5m depths.
(2), the pre-treatment of masking material: pulverize the back mixing, behind the sample all air-dry (water content is 3.5%), cross 20 orders, 200 mesh sieves are crossed in fine grinding again, and through 200 ℃ of oven dry 3h, place moisture eliminator standby.
(3), adopt flyash and commercially available lime powder, as additive:
Flyash is for taking from the one-level ash in Kunming power plant (elder brother's electricity industry main office) the dry ash storehouse, and promptly 300 orders (45 μ m) residual content is less than 12%.Lime powder is the lime powder of market sale.
The mixture of flyash and lime powder will be added in the pretreated masking material; The ratio that adds is flyash (5～20%), lime powder (0～8%); Be used to regulate materialization environments such as the pH value of water body, bed mud and bed mud-water termination and penetrating quality;
(4)-1 pair waters that will implement to handle is carried out subregion earlier and is enclosed and block or jackstone, forms necessarily for barrier on water body bed mud top, promotes water body backflow interface, constructs the environment of a hydrodynamic condition relatively placidity in the water body bottom;
(4)-2, the masking material that step (3) is obtained directly applies water body in lake; Adding way is: broadcast sowing, once carry out, the amount of masking material is a 0.25～0.5g/ square metre of lake.
(4)-3 formation tectum 2 stable by making, can be on the structure of the water body 1 of Fig. 1, tectum 2 and bed mud (settled layer) 3, increase following structure: gravel or cobble with different-grain diameter cover tectum 2, and its thickness should depend on the circumstances, and should approach (0.5～2cm) as far as possible.With reference to Figure 10: form water body below 1, pebble bed 4, grit layer 5 and the tectum 2 of settled layer 3 or more.
(5), to the test of masking effect:
1) the water quality eutrophication indexes regularly detects;
2) algae output and macro-effect detect;
3) bed mud structure and pH value situation;
4) the infiltrative improvement situation of bed mud;
5) cost of soil remediation, costimating;
6) repairing efficiency, time limit estimation etc.
The selected measuring method of each index is national standard method or international method (table 2-2).Except that the small amount of sample analysis Yunnan Institute of Environmental Science carries out, most sample analysis are all finished in Yunnan Prov Agriculture University farming fractional analysis laboratory.
The result is with reference to Fig. 4～Fig. 9.
(6), adjust the add-on of masking material, and adjust reagent type according to the test result of step (5).
Claims (6)
1. sediment covered restoring method for eutrophic water is characterized in that step is as follows:
(1), masking material chooses described masking material employing clay;
(2), the pre-treatment of masking material and additive: pulverize whole mistake 300 mesh sieves in back, and, place moisture eliminator standby through 200 ℃ of oven dry 3h;
(3), an amount of additive will be added in the pretreated masking material;
(4), the masking material that step (3) is obtained directly applies water body in lake;
(5), to the test of masking effect;
(6), adjust the add-on of masking material, and adjust additive types or quantity according to the test result of step (5).
2. sediment covered restoring method for eutrophic water according to claim 1 is characterized in that described clay is selected laterite for use;
The pre-treatment of described masking material is meant pulverizes whole mistake 300 mesh sieves in back, and through 200 ℃ of oven dry 3h, places moisture eliminator standby;
Described an amount of additive is meant and adds flyash or lime powder, or both mixtures; The ratio that adds is: flyash: 5～20% of masking material weight; Lime powder: 0～8% of masking material weight;
Described masking material directly applies water body in lake, and the amount of masking material is a 0.25～0.5g/ square metre of lake.
3. sediment covered restoring method for eutrophic water according to claim 2 is characterized in that, increasing before in step (4) has following steps:
(4)-1 pair waters that will implement to handle is carried out subregion earlier and is enclosed and block or jackstone, forms necessarily for barrier on water body bed mud top, promotes water body backflow interface, constructs the environment of a hydrodynamic condition relatively placidity in the water body bottom.
4. sediment covered restoring method for eutrophic water according to claim 2 is characterized in that, increases following steps after (4) step:
(4)-3 formed tectal stablizing by making, can cover by gravel or the cobble with different-grain diameter on tectum, its thickness is 0.5～2cm.
5. sediment covered restoring method for eutrophic water according to claim 2 is characterized in that, the way that adds of step (4) is: broadcast sowing, once carry out.
6. according to the described sediment covered restoring method for eutrophic water of one of claim 1～5, it is characterized in that the enforcement time of described sediment covered restoring method is selected in algae bio resting stage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101911952A CN101200315B (en) | 2007-12-11 | 2007-12-11 | Sediment covered restoring method for eutrophic water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101911952A CN101200315B (en) | 2007-12-11 | 2007-12-11 | Sediment covered restoring method for eutrophic water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101200315A true CN101200315A (en) | 2008-06-18 |
| CN101200315B CN101200315B (en) | 2011-04-27 |
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| CN101982432A (en) * | 2010-10-27 | 2011-03-02 | 苏州科技学院 | Method for repairing city water body by renewable pure water sludge |
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| CN102408164A (en) * | 2010-09-21 | 2012-04-11 | 中国科学院生态环境研究中心 | Method for in-situ rapidly removing lake-flooding deposits |
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| CN102408164B (en) * | 2010-09-21 | 2015-10-07 | 中国科学院生态环境研究中心 | A kind of original position removes the general method in lake fast |
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| CN102617089A (en) * | 2012-03-28 | 2012-08-01 | 河海大学 | Bentonite-cement in situ covering composite material and preparation method for same |
| CN102659295A (en) * | 2012-04-26 | 2012-09-12 | 大恩(天津)环境技术研发有限公司 | Liner type sediment ecological restoration system |
| CN107055639A (en) * | 2017-04-06 | 2017-08-18 | 兰州交通大学 | A kind of water stabilization material and preparation method and application method |
| CN109231739A (en) * | 2018-10-11 | 2019-01-18 | 浙江海洋大学 | A kind of method of biomass lock phosphorus agent and its removal polluted water body deposit phosphorus in situ |
| CN109231739B (en) * | 2018-10-11 | 2022-03-25 | 浙江海洋大学 | Biomass phosphorus-locking agent and method for removing phosphorus from bottom mud of polluted water body in situ |
| CN109847704A (en) * | 2019-01-18 | 2019-06-07 | 昆明理工大学 | A kind of method and application preparing heavy metal chromium adsorbent using Dian Chi Dredged bed mud |
| CN109847704B (en) * | 2019-01-18 | 2021-12-07 | 昆明理工大学 | Method for preparing heavy metal chromium adsorbent by utilizing Dian pond dredged sediment and application |
| CN111847814A (en) * | 2020-07-17 | 2020-10-30 | 泉州南京大学环保产业研究院 | Black and odorous water body sediment in-situ repair material based on oyster shells and repair method thereof |
| CN112062199A (en) * | 2020-09-08 | 2020-12-11 | 中国科学院南京地理与湖泊研究所 | Sediment-water interface nutritive salt targeted blocking method |
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