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Apparatus for reclaiming sewerage nitrogen and phosphor by ammoniomagnesium phosphate crystal method and method thereof

A technology of ammonium magnesium phosphate and crystallization method, which is applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of large energy consumption, complex process, and low purity of MAP recovery, and achieve The effect of improving the recovery rate, broad application prospects and simple structure

Inactive Publication Date: 2008-11-05
ZHEJIANG UNIV
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Problems solved by technology

However, the recovery of MAP by the fluidized bed process has disadvantages such as complex process, large energy consumption, and low purity of MAP recovery.

Method used

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  • Apparatus for reclaiming sewerage nitrogen and phosphor by ammoniomagnesium phosphate crystal method and method thereof

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Embodiment 1

[0030] This test is a small-scale MAP crystallization method to recover nitrogen and phosphorus from pig farm waste anaerobic fermentation liquid. It is carried out in a glass cylindrical open container with a diameter of 15 cm and a height of 24 cm. The reaction temperature is 18-21°C (room temperature). The MAP sediment collector is composed of 8 stainless steel wire mesh surfaces, the diameter of the stainless steel wire is 0.4mm, the diameter of the mesh is 1mm, and the total area of ​​the stainless steel wire mesh is 576cm 2 , each surface of stainless steel wire mesh 6 × 12cm. The bottom end of the sediment trap was 4 cm from the bottom surface of the reactor. The basic properties of the pig farm waste anaerobic fermentation liquid used are as follows: pH value 7.55, NH 4 + -N 296mg / L, PO 4 3- -P 64.2mg / L, Mg 2+ 94mg / L, Ca 2+ 65mg / L, Cu 2+ 0.2mg / L, Zn 2+ 0.4mg / L, NO 3 - -N 1.2mg / L, NO 2 - -N 0.28mg / L, CODcr980mg / L, SS 1.4g / L.

[0031] Inject 3L pig farm was...

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Abstract

The invention discloses a device and method for recovering nitrogen and phosphor in the wastewater by the ammoniomagnesium phosphate crystal method. The invention adopts an MAP nitrogen and phosphor recovery device which has a two-stage agitation of a magnetic stirring apparatus and a deposit catcher, then the wastewater of 3 / 5 to 4 / 5 of the volume of the device is added as the reactant liquor, then add magnesium source and phosphorus source regulation reaction liquor with the ration of NH4<+>: PO4<3->: Mg<2+> equal to 1:1:1 to 1:1.2:1.2, then alkali liquor is dropped continuously to maintain the PH value of the reaction liquor at 9.0 plus / minus 0.1, the magnetic stirring apparatus rotates at the speed of 400-600 r / m and the deposit catcher is driven by a motor stirrer and agitates continuously at the speed of 40-60 r / m, and finally the MAP can be obtained. The invention overcomes the problem that the activity of the crystal-forming ions drops when the PH value decreases during the crystallization process, promotes the MAP crystallization process and improves the MAP recovery rate; the magnetic stirring apparatus and the deposit catcher adopted in the MAP recovery device reduces the stirring dead area in the reactor, the reaction liquor is stirred more sufficiently, which is favorable for the MAP crystal-forming ions to form crystal; the deposit catcher that is designed to catch MAP is favorable to improve the MAP purity in the recovered products.

Description

technical field [0001] The invention relates to the technical field of environmental engineering water treatment, in particular to a device and a method for recovering sewage nitrogen and phosphorus by ammonium magnesium phosphate crystallization. Background technique [0002] Since nitrogen and phosphorus are important causes of water eutrophication, nitrogen and phosphorus removal from sewage is one of the main tasks of water treatment. However, the single cycle of phosphorus in nature has caused phosphorus resources to decrease day by day, and the global phosphate rock resources will be exhausted in the middle of this century. However, my country's phosphate rock resources have become one of the 20 minerals that cannot meet the needs of national economic development in 2010. In order to meet the increasingly stringent nitrogen and phosphorus discharge standards and the requirements of sustainable resource utilization, research and development of technologies to control ni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45C02F1/58
Inventor 吴伟祥韩志英安东陈英旭
Owner ZHEJIANG UNIV
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