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In-situ combination method used for sediment nitrogen and phosphorus release control

A release control and combination method technology, applied in chemical instruments and methods, sludge treatment, silicon compounds, etc., can solve the problems of ineffective removal, poor ammonia nitrogen adsorption capacity, etc., and achieve the effect of less destructive and controlled release

Inactive Publication Date: 2016-06-15
SHANGHAI OCEAN UNIV
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Problems solved by technology

The main component of the magnetic particle adsorbent reported in the above-mentioned publications is iron, which is not only easily affected by the oxidation-reduction potential of water body and bottom mud (the trivalent iron that is easy to adsorb phosphorus will be reduced to ferrous iron and dissolved out, and the ferrous iron in ferric oxide is oxidized by dissolved oxygen), and the adsorption capacity of ammonia nitrogen in water is poor, so it cannot effectively remove ammonia nitrogen in the overlying water body and control the release of ammonia nitrogen in sediment

Method used

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  • In-situ combination method used for sediment nitrogen and phosphorus release control

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Experimental program
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Embodiment 1

[0040] (1), preparation of magnetic zirconium-containing adsorbent

[0041] Prepare Fe with a concentration of 0.2mol / L 3+ solution, the preparation concentration is 0.1mol / L Fe 2+ solution, and the formulated Fe 3+ and Fe 2+ The solution is added to the container together, so that the Fe 3+ with Fe 2+ The molar ratio is 2:1;

[0042] Weigh a certain quality of natural zeolite and add to the above-mentioned Fe 3+ and Fe 2+ In the mixture, the quality of natural zeolite and Fe 3+ / Fe 2+ The volume ratio of the mixed liquid is 1g:100mL, and then the container is placed in a constant temperature water bath shaker at 70°C and stirred for 0.5h;

[0043] Add 2mol / L NaOH solution dropwise to the above mixed solution until the pH of the mixed solution is 10, and then place it in a constant temperature water bath shaker at 70°C to continue the reaction for 1h; the solid material obtained from the container by solid-liquid separation is magnetic zeolite;

[0044] Add certain ...

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Abstract

The invention belongs to the technical field of environment protection and particularly relates to an in-situ combination method used for sediment nitrogen and phosphorus release control. The method includes: adding zeolite or zeolite modified by calcium to a position above a sediment-water interface, and mechanically stirring or hydraulically disturbing to mix sediment with the zeolite; adding magnetic absorbent containing zirconium to the position above the sediment-water interface, and using the applied magnetic field effect to remove the used magnetic absorbent containing the zirconium from water; preferably adding the magnetic absorbent containing the zirconium to the position above the sediment-water interface again. The method is low in destruction on a surface water demersal ecological system, can effectively control the release of sediment nitrogen and phosphorus, and is simple and convenient to operate.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to an in-situ combination method for controlling the release of nitrogen and phosphorus from sediment. Background technique [0002] Eutrophication of surface water bodies such as lakes, reservoirs and rivers is one of the most important water environmental problems facing the world today. Nitrogen and phosphorus are the most important limiting factors of eutrophication in surface water, and their sources include exogenous input and endogenous release. Sediment is an important reservoir of nitrogen and phosphorus in surface water. When environmental conditions change, the nitrogen and phosphorus accumulated in sediment will be released into the overlying water again, becoming the endogenous source of eutrophication in surface water. Eutrophication of water bodies plays an important role. Therefore, controlling the release of nitrogen and phosphorus in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00B01J20/16B01J20/28B01J20/30C02F101/16
CPCB01J20/165B01J20/28009C02F11/00C02F2101/16
Inventor 林建伟詹艳慧储鸣王星星姜博汇章喆
Owner SHANGHAI OCEAN UNIV
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