Method for treating wastewater containing nitrogen and phosphorus and synthesizing magnesium ammonium phosphate

A treatment method, ammonium magnesium phosphate technology, applied in water/sewage treatment, neutralized water/sewage treatment, water/sludge/sewage treatment, etc., can solve complex process, large equipment footprint, phosphorus element removal rate It needs to be further improved to achieve the effect of overcoming the complexity of the process, good effect and overcoming the large area occupied by the equipment

Active Publication Date: 2019-08-16
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, many scholars have proposed a new chemical precipitation technology, i.e. fluidized bed crystallization, in the synthesis of various reaction technologies. In the prior art, the struvite crystallization method is generally used, and the struvite crystallization process is too complicated. The equipment occupies a large area, and the removal rate of phosphorus needs to be further improved

Method used

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  • Method for treating wastewater containing nitrogen and phosphorus and synthesizing magnesium ammonium phosphate
  • Method for treating wastewater containing nitrogen and phosphorus and synthesizing magnesium ammonium phosphate

Examples

Experimental program
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Effect test

Embodiment 1

[0029] First open the fluidized bed, add 20g of magnesium ammonium phosphate seed crystals purchased in the fluidized bed, control the waste water flow rate to make the crystal seeds in a fluidized state, adjust the pH in the fluidized bed to alkaline conditions with ammonia water, and adjust the pH value to 9.5, add the magnesium solution of magnesium chloride purchased and turn on the reflux water, the adding speed of the magnesium solution is 0.35m 3 / h, the speed of backflow water is 0.12m 3 / h, raise the water temperature to 55-65°C, and continuously feed the waste water at a speed of 0.2m 3 / h, make the waste water and magnesium liquid react continuously in the fluidized bed, lower the water temperature to 40°C, insert the ultrasonic vibrating rod into the fluidized bed, turn on the ultrasonic vibrating rod for ultrasonic reaction for 90min, the power is 100KHZ, and at the same time, the flow rate of the reflux water Increase to 0.2m 3 / h, turn off the ultrasonic vibra...

Embodiment 2

[0031] Pour 200g of analytically pure magnesium ammonium phosphate hexahydrate into a 1L beaker, add 200ml of deionized water, stir with a magnetic stirrer for 20min, turn off the magnetic stirrer and stop stirring, then let it stand for 20min, filter to remove the supernatant, and remove the large particles at the bottom Put the magnesium ammonium phosphate seed into the oven and dry in the oven at 70°C for 24 hours to prepare the magnesium ammonium phosphate seed, open the fluidized bed, and add 20g of newly prepared magnesium ammonium phosphate seed to the fluidized bed to control the waste water The flow rate makes the crystal seed in a fluidized state, adjust the pH in the fluidized bed to alkaline conditions with ammonia water, adjust the pH value to 9.5, add the magnesium solution of magnesium chloride purchased and turn on the reflux water, the adding speed of the magnesium solution is 0.35m 3 / h, the speed of backflow water is 0.12m 3 / h, raise the water temperature t...

Embodiment 3

[0033] First, use deionized water to dissolve magnesium chloride to prepare a magnesium solution with a concentration of magnesium ions of 0.5mol / L. Turn on the fluidized bed, add 20g of purchased magnesium ammonium phosphate seed crystals to the fluidized bed, and control the flow of waste water so that the crystal seeds are in a fluid state. The pH in the fluidized bed is adjusted to alkaline conditions with ammonia water, the pH value is adjusted to 9.5, the newly prepared magnesium solution is added and the reflux water is turned on, and the adding speed of the magnesium solution is 0.35m 3 / h, the speed of backflow water is 0.12m 3 / h, raise the water temperature to 55-65°C, and continuously feed the waste water at a speed of 0.2m 3 / h, make the waste water and magnesium liquid react continuously in the fluidized bed, lower the water temperature to 40°C, insert the ultrasonic vibrating rod into the fluidized bed, turn on the ultrasonic vibrating rod for ultrasonic reaction...

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Abstract

The invention provides a method for treating wastewater containing nitrogen and phosphorus and synthesizing magnesium ammonium phosphate. The method comprises the following steps: adding seed crystalsinto a fluidized bed, and controlling the wastewater flow rate to enable the seed crystals to be fluidized; adjusting the pH value in the fluidized bed to an alkaline condition; adding magnesium liquid, starting reflux water, increasing the water temperature, and continuously introducing wastewater to enable the wastewater and the magnesium liquid to continuously react in the fluidized bed; reducing the water temperature, inserting the ultrasonic vibrating rod into the fluidized bed, turning on an ultrasonic vibrating rod, carrying out ultrasonic reaction, increasing the flow rate of backflowwater, turning off the ultrasonic vibrating rod, and carry out the reaction continuously; and after the reaction is finished, discharging the treated wastewater and the generated magnesium ammonium phosphate crystal precipitate. The crystal generated by the method is more regular in shape, short in reaction time and high in nitrogen and phosphorus removal rate, and the generated magnesium ammonium phosphate crystal is uniform and regular in particle size.

Description

technical field [0001] The invention relates to the treatment of wastewater containing nitrogen and phosphorus and a method for synthesizing magnesium ammonium phosphate, belonging to the field of wastewater treatment. Background technique [0002] Nitrogen and phosphorus elements are the most basic elements of organisms, and are also the main cause of eutrophication in water bodies, while phosphorus is a limited resource that is non-renewable and difficult to replace. In recent years, the world's population has increased rapidly, and the demand for phosphate fertilizers and food in many countries has also increased day by day. However, with the unscrupulous mining and processing of phosphate rock, the earth is facing a crisis of shortage of phosphate rock. [0003] How to solve the problem of water eutrophication has always been a research hotspot for scientists around the world. The main cause of water eutrophication is the excessive discharge of nitrogen and phosphorus wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58C02F1/66C02F1/36C01B25/45C02F101/16C02F101/10
CPCC02F1/66C02F1/36C02F1/586C02F1/58C01B25/45C02F2101/16C02F2101/105
Inventor 关乾曾桂生凌波付文兆马林娟魏栖梧姬海燕刘勇
Owner NANCHANG HANGKONG UNIVERSITY
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