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

A technology of magnesium ammonium phosphate and internal circulation, applied in the directions of phosphate, phosphorus oxyacid, solution crystallization, etc., can solve the problems of high cost, complicated recovery process of nitrogen and phosphorus, low recovery rate, etc., and achieves less equipment and recovery rate. High, improve the effect of recovery rate

Inactive Publication Date: 2009-08-05
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 crystallization of magnesium ammonium phosphate

Method used

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  • Gas stripping type internal circulation device, and method for recovering nitrogen, phosphor from MAP crystal
  • 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: the method steps of reclaiming nitrogen, phosphorus in the magnesium ammonium phosphate crystallization in the present embodiment 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 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 magnesium ammonium phosphate or inert substances with a particle size of 0.1-0.3 mm and a large specific surface area directly enter the reaction zone through internal circulati...

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Abstract

The invention relates to an air-lifting internal circulation device and a method for recovering nitrogen and phosphorus by crystallization of MAP, and relates to a device and a method for recovering nitrogen and phosphorus by crystallization. The invention solves the problems of complex process, high cost and low recovery rate of recovering nitrogen and phosphorus at present. The bottom of its outer sleeve is fixedly connected with the upper part of the cylinder body, an overflow weir is formed between the outer sleeve and the cylinder body, the water inlet of the drain pipe is connected with the water outlet at the bottom of the outer sleeve body, and the lower end surface of the cylinder body is connected with the water outlet at the bottom of the outer sleeve body. The upper end surface of the conical cylinder bottom is fixedly connected. The steps of the method of the present invention are as follows: pass the waste water containing NH4+-N and PO43--P into the air-lifting type internal circulation device, add the solution containing Mg2+, and feed air at the same time, adjust the pH value to 8.5-10, and react for 10 ~30min, precipitation, magnesium ammonium phosphate crystals can be obtained, and its product MAP directly enters the reaction zone through internal circulation as a crystal nucleus. The method of the invention has the advantages of high recovery rate, simple process, less investment, ideal treatment effect for low-concentration wastewater, and convenient application. The device of the invention has a simple structure and is easy to operate.

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 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 has achieved ideal results Effect. 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 magnesium ammonium phosphate 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 magnesium ammonium phosphate crystallization reactors...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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