CN101805062A - Method for removing nitrogen and phosphorus contained in eutrophic seawater - Google Patents
Method for removing nitrogen and phosphorus contained in eutrophic seawater Download PDFInfo
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- CN101805062A CN101805062A CN 201010130604 CN201010130604A CN101805062A CN 101805062 A CN101805062 A CN 101805062A CN 201010130604 CN201010130604 CN 201010130604 CN 201010130604 A CN201010130604 A CN 201010130604A CN 101805062 A CN101805062 A CN 101805062A
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Abstract
The invention relates to a method for removing nitrogen and phosphorus contained in eutrophic seawater, which is characterized by comprising the following steps of: firstly smashing steel slag; respectively taking steel slag granules with granule diameters range from 20 meshes to 80 meshes, and placing into the eutrophic seawater with the nitrogen concentration of 1.2 mg/L and the phosphorus concentration of 0.2 mg/L, wherein the concentration of the steel slag is 10 g/L; and then adding seaweeds according to the proportion of steel slag: seaweeds=10:3-5:1, wherein the initial density of the seaweeds is 2-3 g/L, duration is 7-10 days, the seaweeds are large seaweeds, i.e. gardon asparagus, Undaria pinnitafida, and the like. The invention combines the physical adsorption and the chemical precipitation of the steel slag on the phosphorus with the biological adsorption of the gardon asparagus on the nitrogen and the phosphorus, obviously reduces the concentration of the nitrogen and the phosphorus contained in the eutrophic seawater so that the concentration of the processed nitrogen and phosphorus respectively accords with two seawater quality standards and one seawater quality standard, has low cost, not only solves the problem of eutrophication of the seawater and improves the ocean ecological environment, but also has important significance for the development of a steel industry.
Description
Technical field
The invention belongs to marine environmental protection and Resource Recovery of Industrial Solid Waste field, be specifically related to the recycle of slag, relate more specifically to the application that utilizes slag and kelp to administer the contained in eutrophic seawater aspect.
Background technology
In recent years, the expansion of China's Coastal Areas rapid development of economy and mariculture industry has aggravated the rising of nitrogen, phosphorus concentration in the contained in eutrophic seawater.How to reduce the concentration of nutritive salt such as nitrogen, phosphorus in the contained in eutrophic seawater, prevent that the seawater eutrophication from having become the emphasis of marine scientific research.
Kelp is the important primary producer in ocean, long, the fast growth of life cycle, but in process of growth absorbed nitrogen, phosphorus, with changing into the nutritive ingredient that self needs, be nitrogen storehouse and phosphorus storehouse important in the Marine ecosystems.Utilizing kelp to absorb and fixing nutritive salt such as the nitrogen in the seawater, phosphorus, by the results kelp supernutrition salt is shifted out from the seawater transfer, is the effective measure that solve the seawater eutrophication problem.
Slag is the waste that is produced in the blase furnace cast iron smelting process, has that porous, surface-area are big, an absorption property characteristic preferably.In addition, slag can help the macro growth and breeding to necessary nutritive ingredients of algal grown such as seawater stripping silicon, iron, manganese.Along with the fast development of China's Iron And Steel Industry, all produce a large amount of slags every year, the national slag that accumulates reached 33,845 ten thousand tons by 2006.If slag can be applied to the improvement of contained in eutrophic seawater, by promoting the removal effect of macro growth and slag self to phosphorus, further reduce the concentration of nutritive salt such as nitrogen, phosphorus in the seawater, be undoubtedly a great technological breakthrough for solving the seawater eutrophication problem, and also significant for the Sustainable development of steel industry.
Summary of the invention
Utilize problem again in order to solve seawater eutrophication problem and slag, the invention provides a kind of slag and kelp of utilizing and remove the nitrogen in the contained in eutrophic seawater and the method for phosphorus.
Technical scheme of the present invention: at first pulverize slag, and get particle size range at 20-80 purpose steel slag particle, place the contained in eutrophic seawater of nitrogen concentration 1.2mg/L, phosphorus concentration 0.2mg/L, and slag concentration is 10～100g/L, again according to slag: the ratio of marine alga=10: 3～100: 1 adds marine alga, the marine alga initial density is 1～3g/L, and the time length is 7～10 days.
The present invention has made full use of the solid waste of steel industry---slag, with physical adsorption, the chemical precipitation of slag to phosphorus, and combine with the bio-absorbable of Thallus Gracilariae to nitrogen, phosphorus, can significantly reduce the concentration of nutritive salt such as nitrogen, phosphorus in the contained in eutrophic seawater, expense is cheap, achieve noticeable achievement, and is 77.7%～77.8% to the clearance of nitrogen, is 98.5%～99.1% to the clearance of phosphorus, seawater nitrogen concentration after the processing is 0.268mg/L, meets two class Seawater Quality Standardss; Seawater phosphorus concentration after the processing is 0.0019mg/L, meets a class Seawater Quality Standards.The present invention has not only solved the seawater eutrophication problem, improves the marine eco-environment, and also significant for the Sustainable development of steel industry.
Embodiment
Method of the present invention: at first pulverize slag, and get particle size range at 20-80 purpose steel slag particle, place the contained in eutrophic seawater of nitrogen concentration 1.2mg/L, phosphorus concentration 0.2mg/L, and slag concentration is 10～100g/L, again according to slag: the ratio of marine alga=10: 3～100: 1 adds marine alga, the marine alga initial density is 1～3g/L, and the time length is to get final product in 7～10 days.
Above-mentioned marine alga is healthy kelp, as Thallus Gracilariae, wakame etc.
Embodiment 1
Get particle diameter 20 purpose steel slag particles, place the contained in eutrophic seawater of nitrogen concentration 1.2mg/L, phosphorus concentration 0.2mg/L, wherein slag concentration is 10g/L; Add healthy Thallus Gracilariae frond again, Thallus Gracilariae density is 2g/L.Time length is 7 days.The nitrogen concentration that records in the seawater is 0.268mg/L, meets two class Seawater Quality Standardss, and nitrogen removal efficiency is 77.7%; Phosphorus concentration in the seawater is 0.0019mg/L, meets a class Seawater Quality Standards, and tp removal rate is 99.1% (table 1).
Embodiment 2
Get particle diameter 60 purpose steel slag particles, place the contained in eutrophic seawater of nitrogen concentration 1.2mg/L, phosphorus concentration 0.2mg/L, wherein slag concentration is 10g/L; Add healthy Thallus Gracilariae frond again, Thallus Gracilariae density is 3g/L.Time length is 7 days.The nitrogen concentration that records in the seawater is 0.266mg/L, meets two class Seawater Quality Standardss, and nitrogen removal efficiency is 77.8%; Phosphorus concentration in the seawater is 0.0062mg/L, meets a class Seawater Quality Standards, and tp removal rate is 96.9% (table 1).
Embodiment 3
Get particle diameter 80 purpose steel slag particles, place the contained in eutrophic seawater of nitrogen concentration 1.2mg/L, phosphorus concentration 0.2mg/L, wherein slag concentration is 100g/L; Add healthy Thallus Gracilariae frond again, Thallus Gracilariae density is 1g/L.Time length is 7 days.The nitrogen concentration that records in the seawater is 0.258mg/L, meets two class Seawater Quality Standardss, and nitrogen removal efficiency is 78.5%; Phosphorus concentration in the seawater is 0.0027mg/L, meets a class Seawater Quality Standards, and tp removal rate is 98.6% (table 1).
Table 1 utilizes nitrogen and the phosphorus in slag and the kelp removal contained in eutrophic seawater
Claims (2)
1. the nitrogen in the contained in eutrophic seawater and the removal method of phosphorus, it is characterized in that at first pulverizing slag, and get particle size range 20-80 purpose steel slag particle, place the contained in eutrophic seawater of nitrogen concentration 1.2mg/L, phosphorus concentration 0.2mg/L, and slag concentration is 10～100g/L, again according to slag: the ratio of marine alga=10: 3～100: 1 adds marine alga, and the marine alga initial density is 2～3g/L, and the time length is 7～10 days.
2. the nitrogen in the contained in eutrophic seawater as claimed in claim 1 and the removal method of phosphorus is characterized in that above-mentioned marine alga is the kelp of Thallus Gracilariae, wakame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201010130604XA CN101805062B (en) | 2010-03-20 | 2010-03-20 | Method for removing nitrogen and phosphorus contained in eutrophic seawater |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010130604XA CN101805062B (en) | 2010-03-20 | 2010-03-20 | Method for removing nitrogen and phosphorus contained in eutrophic seawater |
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| CN101805062A true CN101805062A (en) | 2010-08-18 |
| CN101805062B CN101805062B (en) | 2012-07-25 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1354143A (en) * | 2000-11-17 | 2002-06-19 | 光州科学技术院 | Method for simultaneously removing nitrogen and phosphorus in wastewater |
| CN101269875A (en) * | 2007-03-23 | 2008-09-24 | 宝山钢铁股份有限公司 | Application of carbonatation steel scoria in wastewater treatment |
| CN101514053A (en) * | 2009-03-19 | 2009-08-26 | 同济大学 | Eutrophication water body artificial wetland processing system taking steel-making waste residue as a substrate |
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- 2010-03-20 CN CN201010130604XA patent/CN101805062B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1354143A (en) * | 2000-11-17 | 2002-06-19 | 光州科学技术院 | Method for simultaneously removing nitrogen and phosphorus in wastewater |
| CN101269875A (en) * | 2007-03-23 | 2008-09-24 | 宝山钢铁股份有限公司 | Application of carbonatation steel scoria in wastewater treatment |
| CN101514053A (en) * | 2009-03-19 | 2009-08-26 | 同济大学 | Eutrophication water body artificial wetland processing system taking steel-making waste residue as a substrate |
Non-Patent Citations (1)
| Title |
|---|
| 《中国环境科学》 20071231 许刚等 转炉钢渣对赤潮异弯藻生长的影响 816-820 1-2 第27卷, 第6期 2 * |
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| CN101805062B (en) | 2012-07-25 |
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