Integrated device and method for efficient magnesium ammonium phosphate crystallization and solid-liquid separation

A solid-liquid separation, magnesium ammonium phosphate technology, applied in separation methods, chemical instruments and methods, phosphorus compounds, etc., can solve the problems of low processing capacity, low ammonia phosphorus recovery rate, incomplete solid-liquid separation of MAP crystals, etc. The effect of simplifying equipment, efficient solid-liquid separation, avoiding secondary pollution and waste of crystals

Inactive Publication Date: 2019-06-25
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the invention is to design an integrated device to realize high-efficiency crystallization and solid-liquid separation of magnesium ammonium phosphate to overcome the technical problems of low wastewater treatment capacity of MAP crystallization reactor, incomplete solid-liquid separation of MAP crystals, and low recovery rate of ammonia phosphorus. and methods to realize the engineering application of MAP crystallization technology in ammonia phosphorus wastewater treatment

Method used

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  • Integrated device and method for efficient magnesium ammonium phosphate crystallization and solid-liquid separation
  • Integrated device and method for efficient magnesium ammonium phosphate crystallization and solid-liquid separation
  • Integrated device and method for efficient magnesium ammonium phosphate crystallization and solid-liquid separation

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Embodiment 1

[0036] as attached figure 1 As shown, the MAP crystallization reactor device of the present invention comprises: 1-nitrogen and phosphorus waste water inlet pump; 2-magnesium source water inlet pump; 3-lye liquor inlet pump; 4-mechanical stirrer; 5-pH meter; 6-inner cylinder wall ;7-outer cylinder wall; 8-sloping plate; 9-ring type V-type solid-liquid two-phase separator; 10-water outlet; 11-conical mud bucket; 12-MAP crystal discharge valve; I-mixed reaction crystallization area ; II-buffer zone; III-MAP sludge zone; IV-solid-liquid separation zone; V-outlet zone. Mixed reaction crystallization zone (I) links to each other with nitrogen and phosphorus wastewater inlet water pump (1), magnesium source water inlet pump (2), lye inlet water pump (3), and is provided with mechanical stirrer (4) and pH meter ( 5), the buffer zone (II) is connected to the mixed reaction crystallization zone (I), and is arranged at the lower part of the mixed reaction crystallization zone (I), and ...

Embodiment 2

[0039] The operating method of magnesium ammonium phosphate crystallization reclaiming nitrogen and phosphorus among the present invention: by pump (1) suction n(PO 4 3- ):n(NH 4 + ) is 1:1 phosphorus and ammonium mixed wastewater in the inner cylinder mixed reaction crystallization zone (I), and at the same time through the pump (2, 3) suction magnesium source and the lye required for the reaction in the inner cylinder mixed reaction crystallization zone ( In I), control n(Mg 2+ ): n(PO 4 3- ) at 1:1, control the influent flow rate at 24.8L / h, turn on the agitator (4), rotate at 350r / min, and control the pH value of the reaction at 9.5 (±0.2) through the pH meter (5) to carry out the crystallization reaction . After the reaction, the waste water carries crystals into the buffer zone (II) first, and the settled crystals fall into the MAP sludge area (III), and the sludge discharge valve (12) at the bottom of the MAP sludge area (III) is fixed every 0.5h to discharge 1L ...

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Abstract

Belonging to the technical field of sewage recycling treatment, the invention relates to an integrated device and method for efficient magnesium ammonium phosphate crystallization and solid-liquid separation. A mixed reaction crystallization zone is connected to water intake pumps; a solid-liquid separation zone is disposed between an inner cylinder and an outer cylinder; a buffer zone is under the mixed reaction crystallization zone; an MAP sludge zone is disposed in a cone at the bottom of a reactor, and the bottom is connected to a large aperture valve; a water outlet zone is arranged at the top of the reactor, and employs an overflow water discharge way. The reactor operation includes crystallization reaction and solid-liquid separation processes. The reactor device adopts rapid mechanical stirring way to accelerate crystallization reaction, thus improving the reactor treatment capacity; at the same time, a baffled continuous flow treatment way with the same inflow and outlet waterdirection is employed to prolong the flow path of materials in the reactor, so that the crystallization reaction and solid-liquid separation process can be more complete; by setting an inclined platein the solid-liquid separation zone, efficient solid-liquid separation can be achieved, and MAP loss and secondary pollution can be avoided during water discharge.

Description

technical field [0001] The invention relates to the technical field of sewage resource treatment. It is mainly an integrated device and method for realizing high-efficiency crystallization and solid-liquid separation of magnesium ammonium phosphate (MAP). Background technique [0002] In the field of sewage resource treatment, as a nitrogen and phosphorus wastewater treatment process, magnesium ammonium phosphate crystallization method has received more and more attention in the field of nitrogen and phosphorus wastewater resource treatment due to its advantages of synchronous recovery of nitrogen and phosphorus resources in sewage. favored by scholars. The reactor is the core device of MAP crystallization technology and the link that closely connects MAP crystallization technology with engineering applications. The research and application of reactors can accelerate the industrialization of MAP nitrogen and phosphorus recovery technology, thereby achieving sustainable deve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04B01D21/00B01D21/01B01D21/28C01B25/45
Inventor 郝瑞霞李鹏李嘉雯孙彤武旭源李宏康
Owner BEIJING UNIV OF TECH
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