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Gas stripping type internal circulation device, and method for recovering nitrogen, phosphor from MAP crystal

An internal circulation, air-stripping technology, applied in solution crystallization, chemical instruments and methods, phosphates, etc., can solve the problems of high cost, low recovery rate, complex recovery of nitrogen and phosphorus, and achieve less equipment and recovery rate. High, improve the effect of recovery rate

Inactive Publication Date: 2007-12-26
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the current problems of complex nitrogen and phosphorus recovery process, high cost, and low recovery rate. The present invention provides an air-lift internal circulation device and a method for recovering nitrogen and phosphorus by MAP crystallization

Method used

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  • Gas stripping type internal circulation device, and method for recovering nitrogen, phosphor from MAP crystal

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specific Embodiment approach 1

[0010] Specific embodiment one: the cylinder body 5 diameter of the airlift type internal circulation device 20 of the present embodiment is 200mm, and the total height of the device is 400mm, and it is composed of the first air inlet pipe 1, the second air inlet pipe 2, the outer sleeve 3, the inner Sleeve 4, cylinder body 5, fixed plate 6, water inlet and feed pipe 7, water outlet pipe 8, connection plate 9, isolation plate 10 with through hole 19, gas pipe 11, tapered cylinder bottom 12, equipped with The mud discharge pipe 14 of the valve 13 is composed of; the bottom of the outer sleeve 3 is fixedly connected with the upper part of the cylinder 4, an overflow weir 19 is formed between the outer sleeve 3 and the cylinder 5, and the water inlet of the drain pipe 8 is connected with the outer sleeve The water outlet at the bottom of the cylinder 3 is connected, the lower end surface of the cylinder body 5 is fixedly connected with the upper end surface of the conical cylinder...

specific Embodiment approach 2

[0012] Embodiment 2: This embodiment differs from Embodiment 1 in that the reaction device has reduced the second air inlet pipe 2 and added an agitator 17 , and the agitator 17 extends into the middle and lower part of the inner sleeve 4 . Others are the same as in the first embodiment.

specific Embodiment approach 3

[0013] Specific embodiment three: in this embodiment, the method steps of MAP crystallization recovery nitrogen, phosphorus are as follows: will contain NH 4 + -N and PO 4 3- The waste water with a molar ratio of -P of 1 to 80:1 is passed into the air-lifting type internal circulation device 20, and then the waste water containing Mg is added. 2+ The solution makes Mg 2+ / PO 4 3- The molar ratio of -P is 1 to 3:1, and air is introduced at the same time, the volume ratio of air intake to liquid intake is 10 to 16:1, the pH value is adjusted to 8.5 to 10, the reaction is 10 to 30 minutes, and the precipitation is 1.5 to 10 hours. Magnesium ammonium phosphate crystals are obtained, that is, the nitrogen and phosphorus in the wastewater are recovered, and the product MAP or the inert substance with a particle size of 0.1-0.3mm and a large specific surface area directly enters the reaction zone through the internal circulation as a crystal nucleus.

[0014] In this embodiment...

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Abstract

This invention relates to apparatus and method for recovering N and P by crystallization. The method solves the problems of complex N and P recovery process, high cost and low recovery rate. The bottom of the outer sleeve and the top of the cylinder are fixed. An overflow weir is formed between the outer sleeve and the cylinder. The water inlet of the water discharge pipe and the water outlet at the bottom of the outer sleeve are through connected. The lower end of the cylinder and the upper end of the conical cylinder bottom are fixed. The method comprises: sending wastewater containing NH4+-N and PO43--P into an air-lift internal circulation apparatus, adding a solution containing Mg2+, introducing air, adjusting the pH value to 8.5-10, reacting for 10-30 min, precipitating the obtained magnesium ammonium phosphate crystal, and sending to the reaction zone as the seed crystal by internal circulation. The method has such advantages as high recovery rate, simple process, low investment, good treatment effect, and easy application. The apparatus has such advantages as simple structure and easy operation.

Description

technical field [0001] The invention relates to a device and method for recovering nitrogen and phosphorus by crystallization. Background technique [0002] Magnesium Ammonium Phosphate (MAP) crystallization process can separate ammonia nitrogen and phosphate in water simultaneously by precipitation, so it is widely used in the recovery of nitrogen and phosphorus from sewage or wastewater, especially in Japan, this process has been used in production practice, and Achieved ideal results. The chemical crystallization reaction process is usually divided into two parts: reaction and precipitation separation, that is, the reaction zone is used to add reactants and adjust the pH value (magnesium ions are usually added in the MAP reaction, and the reaction process requires an optimal pH range of 8.5-10.0 ), the sedimentation zone is used to separate crystals and supernatant. Therefore, most of the current MAP crystallization reactors use reaction and precipitation separation in ...

Claims

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Application Information

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IPC IPC(8): C02F1/58C02F1/66B01D9/02C01B25/26C01B25/32
Inventor 赵庆良刘志刚王琨杨楠
Owner HARBIN INST OF TECH
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