CN1810658A - Phosphorus release inhibitor for eutrophic water deposit and its prepn and application - Google Patents
Phosphorus release inhibitor for eutrophic water deposit and its prepn and application Download PDFInfo
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- CN1810658A CN1810658A CN 200510122267 CN200510122267A CN1810658A CN 1810658 A CN1810658 A CN 1810658A CN 200510122267 CN200510122267 CN 200510122267 CN 200510122267 A CN200510122267 A CN 200510122267A CN 1810658 A CN1810658 A CN 1810658A
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- release inhibitor
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Abstract
The present invention relates to water deposit phosphorus release treating and preventing issue and fuel burning power plant fly ash resource utilization. The preparation process of phosphorus release inhibitor for eutrophic water deposit includes the following steps: maintaining fly ash water content of 5-10 %; soaking fly ash in buffering alum solution for 12-48 hr while stirring; heating the mixture in furnace at 100-300 to fix Al of the solution inside fly ash; and cooling and drying the fly ash to obtain the phosphorus release inhibitor. When used, the inhibitor throwing amount is 5 kg/sq m. the present invention combines in-situ fixing technology and eutrophic salt deactivating technology to develop deposit phosphorus release inhibitor with fly ash as main material. The inhibitor has good use effect and low cost, and is suitable for treating and preventing of various kinds of eutrophic water. The present invention also provides new way for treating fly ash resource.
Description
Technical field
The present invention relates in all kinds of water bodys, the sediment phosphorus endogenous discharges the improvement and the prevention of problem; And the recycling of flying dust that large coal-fired power plant is arranged.
Background technology
Individual surplus the natural lake of China has 2300 approximately, area of lake is 70988km
2, accounting for 0.8% of the national land total area, the total pondage in lake is more than 7,077 hundred million m
3And according to statistics, the main lake of China is in because of nitrogen and phosphorus pollution causes accounting for of eutrophication adds up 56% of lake.In a single day water body enters the eutrophy stage and will lose its due function, causes great financial loss, destroys environmental landscape.Constantly perfect along with environmental management, the input of the exogenous pollution thing in lake has obtained effective control.But the problem of lake eutrophication is also unresolved, and chief reason is exactly that the nutritive salt in the settling (mainly being phosphorus) can progressively discharge, and makes water body remain on the eutrophication state after going into lake nutritive salt load minimizing or cutting dirt fully.Therefore, seek the method that phosphorus discharges in a kind of cost-effective control settling and just become the matter of utmost importance of administering body eutrophication.The normal both at home and abroad at present method that adopts has following three kinds:
(1) anchored in place technology.It is the deposit surface that one deck cleaning substance is covered pollution that original position covers, thereby limits its influence to overlying water effectively.Covering material can be clean deposition thing, sand, gravel, film, and the centre can also be mixed with individual layer or multiple geotechnological material.Original position covers and Marine sediments and bottom-dwelling physical property ground can be separated, and prevents settling migration or resuspending; Reduce the diffusion flux of pollutent in water simultaneously, at present cladding process in the river course, ground such as coastal waters, river mouth have successfully and use.
(2) passivating technique of nutritive salt.Aluminium salt or molysite can produce precipitation with inorganic and particle phosphorus, reduce the content of phosphorus in the water body.Simultaneously form the new active coating of one deck, and can form co-precipitation, stoped the diffusion of phosphorus in water body with the phosphorus that discharges in the settling in deposit surface.Correlative study shows, once discharges the effectiveness that can keep 1 year.Some simulated experiments and application have also confirmed the validity of this method.
(3) settling dredging.Theoretically, removing settling is the method for removing endogenous nutritive salt the most completely, can forever eliminate the influence of settling to water quality by dredging, and short-term water correction effect is obvious, and domestic and international application is more.
More than in three kinds of methods, dredging the most frequently used while also is the most dangerous method, the residual body of dredging under residual of settling is easy to spread, and pollutes surface deposit once more.Dredging institute goes out sedimental arrangement clearly in addition also needs careful attention, and Hazardous substancess such as contained heavy metal, agricultural chemicals may cause secondary pollution owing to arrangement is improper in the settling.Preceding two kinds of methods then mainly are subjected to the restriction of covering material, passivator cost and bio-toxicity, not seen widespread use.
Summary of the invention
The purpose of this invention is to provide a kind of inhibitor that is applied to deposit surface, it can effectively reduce in the settling phosphorus to the release of water body.It is main raw material with power plant's waste flying dust, and with low cost, effect is remarkable, uses conveniently, has realized the utilization again to flying dust simultaneously.
Be the technical scheme that realizes that purpose of the present invention adopts:
A kind of preparation method of phosphorus release inhibitor for eutrophic water deposit comprises the steps:
A. the flying dust of collecting in the large coal-fired power plant boiler is suitably dry, keeping its water ratio is 5% ~ 10%;
B. selecting alum buffered soln is additive, gets flying dust and alum buffered soln weight ratio 1: 1～1: 5, flooded 12 ~ 48 hours, during constantly stir, make its abundant mixing;
C. mixture is put into High Temperature Furnaces Heating Apparatus and be warming up to 100～300 ℃, evaporate wherein moisture gradually, the Al in the solution is fixed in the flying dust.Flying dust after handling is obtained phosphorus release inhibitor through cooling, drying;
When d. using, get inhibitor and tap water and mix at 1: 1, be applied to deposit surface.
The alum buffered soln that preferably contains Al 0.7g/L is additive.
Preferred flying dust and alum buffered soln weight ratio 2: 5.
Preferred Al fixed temperature is 150 ℃.
A kind of phosphorus release inhibitor for eutrophic water deposit is formed by method for preparing.
A kind of application method of phosphorus release inhibitor for eutrophic water deposit, during use, the inhibitor dosage is 5kg/m
2(look the settling particular case and take the circumstances into consideration increase and decrease).
Beneficial effect of the present invention is: the anchored in place technology is combined with the passivating technique of nutritive salt, develop with the large power plant flying dust is the sediment phosphorus release inhibitor of main raw material, result of use is good, and with low cost, is applicable to the improvement and the prevention of all kinds of body eutrophication problems.
In addition, flying ash in electric power plant (flyash) is to be fuel with the coal, receives the thin ash of catching from flue gas, and its content accounts for 5%～20% of coal-fired total amount, is the main solid waste that the coal-burning power plant discharges.Because the little median size of its particle has only 25 μ m, very easily suspend, it has caused extensive attention to atmospheric pollution, in case they are discharged into atmosphere, is easy to be sucked by human body.These pellets have carcinogenic, teratogenesis and mutagenic effect to HUMAN HEALTH, are the one of the main reasons that causes human mortality ratio to rise, and also are the important factors of bringing out milestones such as Global climate change, smog episode and depletion of the ozone layer.Therefore, the present invention provides new approach for the safe handling and the recycling of flying ash in electric power plant.
Description of drawings
Fig. 1 is phosphorus release inhibitor application effect (one)
Fig. 2 is phosphorus release inhibitor application effect (two)
Embodiment
Embodiment 1
With Tianjin Taida development area flying ash in electric power plant is raw material, the preparation phosphorus release inhibitor.And this inhibitor is applied to the surface of the manmade landscape, artificial landscape of Taida river drift, observe it and suppress the effect that phosphorus discharges.Concrete implementation step is as follows:
Take by weighing 40g Taida flying ash in electric power plant, suitably dry, keeping its water ratio is about 5%; Add 100ml and contain the alum buffered soln dipping 24 hours of Al 0.7g/L, during constantly stir, make its abundant mixing.Mixture is put into High Temperature Furnaces Heating Apparatus be warming up to 150 ℃, evaporate wherein moisture gradually, cooling, drying obtain phosphorus release inhibitor.
Adopt the self-control column experiment device in experiment, carry out the continuously dynamic release experiment of phosphorus, checking experimentizes.Inhibitor and the tap water made are mixed at 1: 1, be applied to deposit surface in the The columns.The columns internal diameter 100mm, high 500mm, floorage is 7.85 * 10
-3m
2, useful volume is 3.14 * 10 in the post
-3m
3Experimental water is a tap water, regulates its pH value and salinity in equalizing tank, and source water imports in the The columns by the mode of the following water intake mode of submersible pump.The post inner bottom part is filled the 40mm settling, and water inlet is apart from deposition object plane 20mm, and water outlet guarantees the dark 400mm of overlying water apart from deposition object plane 400mm, and the water sediment depth ratio is 10: 1.Get the water yield of cumulative volume 1/10 in the post every day, and mend fullly by the mode of water inlet down, make that water body upgraded once in average 10 days in the post.Get water sample in the post at interval by certain hour, cross 0.45 μ m filter membrane suction filtration, the PO of gained suction filtration liquid in the molybdenum blue colorimetric method mensuration solution
4 3-Concentration.Test used settling and take from Taida manmade landscape, artificial landscape river course.
Apply in the rear pillar of inhibitor that total dissolved phosphorus (TDP) concentration remains at 0.021～0.030mg/L in the very low concentration range in the water body, and water conditioning, TDP changes little, only in 0.023mg/L minor fluctuations (Fig. 1) up and down, the total phosphorus concentration that has reached the category-A water body of stipulating in the GB12941-91 consumable water of sight and amusement water quality standard substantially requires (0.020mg/L).And do not apply in the scope that water body TDP concentration in the blank post of inhibitor remains on 0.052～0.080mg/L (Fig. 1), surpass the total phosphorus concentration standard (0.050mg/L) of the C class water body of stipulating in the GB12941-91 consumable water of sight and amusement water quality standard.Illustrate that using of inhibitor suppressed in the settling phosphorus significantly to the release of water body.
Embodiment 2
Take by weighing 40g Taida flying ash in electric power plant, suitably dry, keeping its water ratio is about 5%; Add 50ml and contain the alum buffered soln dipping 24 hours of Al 0.7g/L, during constantly stir, make its abundant mixing.Mixture is put into High Temperature Furnaces Heating Apparatus be warming up to 100 ℃, evaporate wherein moisture gradually, cooling, drying obtain phosphorus release inhibitor.Applying method is the same, application effect such as Fig. 2.At experimental session, aqueous phase TDP mean concns is 0.035, has reached the total phosphorus concentration standard (0.050mg/L) of the C class water body of stipulating in the GB12941-91 consumable water of sight and amusement water quality standard.
Flying ash in electric power plant leaches toxicity test
Adopt GB/T15555.1～15555.11 solid waste to leach the toxicity test method, the leach liquor of Taida's flying ash in electric power plant is analyzed.Use GC-MS to measure the content of heavy metal composition in the leach liquor, measurement result such as table 1.Heavy metal content illustrates that all far below standard value Taida's flying ash in electric power plant has reached national standard in the security of using in the leach liquor.But when relating to different flying ash in electric power plant, before production, also need to repeat this detection.
Table 1 Taida flying ash in electric power plant leach liquor toxicity is differentiated
| Sequence number | Project | Leach liquor maximum permissible concentration (mg/L) | Leach liquor measured concentration (mg/L) |
| 1 | Organic mercury | Must not detect | Do not detect |
| 2 | Mercury and compound thereof (in total mercury) | 0.05 | 0.0108 |
| 3 | Plumbous (in total lead) | 3 | 0.0035 |
| 4 | Cadmium (in total cadmium) | 0.3 | Do not detect |
| 5 | | 10 | |
| 6 | Sexavalent chrome | 1.5 | |
| 7 | Copper and compound thereof (in total copper) | 50 | 0.0005 |
| 8 | Zinc and compound thereof (in total zinc) | 50 | 0.6408 |
| 9 | Nickel and compound thereof (in total nickel) | 10 | 0.0158 |
| 10 | Arsenic and compound thereof (in total arsenic) | 1.5 | 0.0324 |
Claims (6)
1. the preparation method of a phosphorus release inhibitor for eutrophic water deposit comprises the steps:
A. the flying dust of collecting in the large coal-fired power plant boiler is suitably dry, keeping its water ratio is 5% ~ 10%;
B. selecting alum buffered soln is additive, gets flying dust and alum buffered soln weight ratio 1: 1～1: 5, flooded 12 ~ 48 hours, during constantly stir, make its abundant mixing;
C. mixture is put into High Temperature Furnaces Heating Apparatus and be warming up to 100～300 ℃, evaporate wherein moisture gradually, the Al in the solution is fixed in the flying dust.Flying dust after handling is obtained phosphorus release inhibitor through cooling, drying;
When d. using, get inhibitor and tap water and mix at 1: 1, be applied to deposit surface.
2. the preparation method of phosphorus release inhibitor for eutrophic water deposit according to claim 1, it is characterized in that: choosing the alum buffered soln that contains Al 0.7g/L is additive.
3. the preparation method of phosphorus release inhibitor for eutrophic water deposit according to claim 1 is characterized in that: flying dust and alum buffered soln weight ratio 2: 5.
4. the preparation method of phosphorus release inhibitor for eutrophic water deposit according to claim 1 is characterized in that: preferred Al fixed temperature is 150 ℃.
5. a phosphorus release inhibitor for eutrophic water deposit is characterized in that: be prepared from by the described method of claim 1.
6. the application method of a phosphorus release inhibitor for eutrophic water deposit, it is characterized in that: during use, the inhibitor dosage is 5kg/m
2
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101222679A CN1314599C (en) | 2005-12-12 | 2005-12-12 | Phosphorus release inhibitor for eutrophic water deposit and its prepn and application |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101222679A CN1314599C (en) | 2005-12-12 | 2005-12-12 | Phosphorus release inhibitor for eutrophic water deposit and its prepn and application |
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|---|---|
| CN1810658A true CN1810658A (en) | 2006-08-02 |
| CN1314599C CN1314599C (en) | 2007-05-09 |
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|---|---|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113486288A (en) * | 2021-06-30 | 2021-10-08 | 中国科学院生态环境研究中心 | Method for determining ecological dredging depth of sediment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1686847B (en) * | 2005-04-07 | 2014-07-16 | 中国科学院生态环境研究中心 | Efficient phosphor fixation technique for controlling eutrophication of water body |
-
2005
- 2005-12-12 CN CNB2005101222679A patent/CN1314599C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113486288A (en) * | 2021-06-30 | 2021-10-08 | 中国科学院生态环境研究中心 | Method for determining ecological dredging depth of sediment |
| CN113486288B (en) * | 2021-06-30 | 2024-02-02 | 中国科学院生态环境研究中心 | Method for determining ecological dredging depth of sediment |
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| Publication number | Publication date |
|---|---|
| CN1314599C (en) | 2007-05-09 |
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Granted publication date: 20070509 Termination date: 20100112 |