Preparation method and applications of synchronous nitrogen and phosphorus absorption agent

An adsorbent, nitrogen and phosphorus technology, applied in the field of water pollution control, can solve the problem of simultaneous removal of nitrogen and phosphorus pollutants, and achieve the effect of promoting phosphorus adsorption capacity, high fixed capacity, and improving adsorption capacity

Inactive Publication Date: 2015-02-25
NANJING INST OF GEOGRAPHY & LIMNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the problem that the existing nitrogen or phosphorus adsorbents are only aimed at a single pollutant species and cannot simultaneously remove nitrogen and phosphorus pollutants simultaneously, and proposes a method for preparing nitrogen and phosphorus synchronous adsorbents, which uses dolomite attapulgite Clay is used as raw material, and the raw ore is comprehensively modified. The prepared adsorbent can simultaneously remove nitrogen and phosphorus substances in polluted water or sediment. The preparation method is simple and the cost is low. It can be used to control domestic or industrial sewage, rich The release of nitrogen and phosphorus in nutrient water and polluted sediment can effectively control and alleviate the degree of eutrophication of water

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  • Preparation method and applications of synchronous nitrogen and phosphorus absorption agent
  • Preparation method and applications of synchronous nitrogen and phosphorus absorption agent
  • Preparation method and applications of synchronous nitrogen and phosphorus absorption agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1 Preparation of Nitrogen and Phosphorus Synchronous Adsorbent

[0032] A certain mass of dolomite attapulgite raw ore was weighed, mechanically crushed, sieved to 100 mesh, and dried at 105°C to constant weight to obtain the original dolomite attapulgite powder sample. The above undisturbed dolomite attapulgite was directly heated at 800°C for 2 hours to obtain sample A; the undisturbed dolomite attapulgite was treated with 2mol / L NaCl ion exchange for 4 hours, and then heated at 800°C for 2 hours to obtain sample B; The undisturbed dolomite attapulgite was treated with 1mol / LMgCl 2 Ion exchange treatment for 4 hours, followed by heating at 800°C for 2 hours to obtain sample C; the original dolomite attapulgite was placed in 2mol / LNaCl and 1mol / LMgCl 2 The mixed solution (NaCl and MgCl 2 The ratio is 2:1), after ion exchange treatment for 4 hours, it was heated at 800°C for 2 hours to obtain sample D. In the ion exchange treatment, according to the ratio of ...

Embodiment 2

[0035] Example 2 Nitrogen and phosphorus simultaneous adsorbent to the removal effect of nitrogen and phosphorus in simulated wastewater with different concentrations

[0036] Take 0.75 g of the adsorbent obtained from sample D in Example 1 and place it in a 50 ml centrifuge tube filled with 25 ml of different concentrations of nitrogen- and phosphorus-containing simulated wastewater (0.1 mg / L to 100 mg / L, with equal concentrations of nitrogen and phosphorus). (25°C) shake (160rmp) for 12 hours, centrifuge the solution, measure the residual nitrogen and phosphorus concentration in the supernatant, and calculate the nitrogen and phosphorus removal rate. The result is as figure 2 shown. When the dosage of nitrogen and phosphorus synchronous adsorbent is 30g / L, the removal rate of nitrogen is between 60.4% and 92.5%, and the removal rate of phosphorus is between 90.3% and 99.7%.

Embodiment 3

[0037] Example 3 Nitrogen and phosphorus simultaneous adsorbent for the removal effect of nitrogen and phosphorus in different types of actual polluted water bodies

[0038] Get 0.75g of the adsorbent obtained by sample D in Example 1, place 50ml centrifuge tubes that are equipped with 25ml different types of actual polluted water bodies, shake fully after 4 hours, centrifugally filter, measure the residual nitrogen and phosphorus concentration in the supernatant , to calculate nitrogen and phosphorus removal rates. The result is as image 3 as shown, image 3 The results show that the removal rates of nitrogen and phosphorus in eutrophic water (initial concentrations of nitrogen and phosphorus are 0.17mg / L and 0.045mg / L respectively) are 91% and 96.1% respectively; for domestic sewage (initial concentrations of nitrogen and phosphorus are respectively 5.80mg / L and 0.79mg / L) nitrogen and phosphorus removal rates were 83.4% and 92.5%; for fishery wastewater (initial nitrogen ...

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Abstract

The invention discloses a preparation method of a synchronous nitrogen and phosphorus absorption agent. The preparation method of the synchronous nitrogen and phosphorus absorption agent comprises the following steps of: crushing natural dolomite attapulgite clay, and screening the crushed natural dolomite attapulgite clay to obtain fine powder particles; carrying out ion exchange treatment on the fine powder particles by a mixed solution of sodium salt and magnesium salt; carrying out high-temperature heat modification on the prepared product, thereby obtaining the synchronous nitrogen and phosphorus absorption agent. According to the preparation method, dolomite attapulgite and the mixed solution of sodium salt and magnesium salt are subjected to ion exchange, the synchronous nitrogen and phosphorus absorption agent has high-content cation exchange capacity; meanwhile the activity of calcium in dolomite attapulgite is intensified greatly through high-temperature heat treatment, so that the modified and activated product has the capability of removing nitrogen and phosphorus pollutants efficiently. The synchronous nitrogen and phosphorus absorption agent provided by the invention can be applied to removing nitrogen and phosphorus substances in polluted water bodies, meanwhile can control the nitrogen and phosphorus release in polluted bottom mud, and effectively controls the problem of eutrophication of water bodies.

Description

technical field [0001] The invention belongs to the technical field of water pollution control, and relates to a preparation method and application of an adsorbent for nitrogen or phosphorus pollutants, in particular, to an adsorbent capable of synchronously removing and adsorbing nitrogen and phosphorus in water bodies and sediments preparation methods and applications. Background technique [0002] At present, the eutrophication of lakes in my country has become a major water environment problem. Some large lakes such as Taihu Lake, Chaohu Lake and Dianchi Lake are all in a serious eutrophication state, and some small lakes, reservoirs and other closed water bodies are also in a serious eutrophication problem. The cyanobacteria bloom caused by eutrophication seriously threatens the safety of human drinking water and brings great troubles to people's life. [0003] For a long time, phosphorus has been considered as the main limiting factor of water eutrophication. Theref...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/12B01J20/30C02F1/28
Inventor 尹洪斌孔明
Owner NANJING INST OF GEOGRAPHY & LIMNOLOGY
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