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Method for removing phosphorus from sewage on basis of magnesium alloy corrosion

A magnesium alloy and magnesium alloy plate technology, applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve problems such as side reactions

Inactive Publication Date: 2018-05-15
深圳市中涛环保工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using magnesium metal as a sacrificial electrode can provide the magnesium ions needed for the crystallization of magnesium ammonium phosphate, which is also economically reasonable, but this method requires an external power source and a large amount of energy consumption. At the same time, in the complex system of wastewater, the electrolysis of current may cause other side effects. The occurrence of the reaction

Method used

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Examples

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Effect test

Embodiment 1

[0013] A method for removing phosphorus in sewage based on magnesium alloy corrosion, including the following steps: the biogas slurry supernatant contains high nitrogen and phosphorus, and magnesium alloy is added to the precipitation reactor in the biogas slurry supernatant, which will contain a certain quality of magnesium The magnesium alloy plate is immersed in wastewater, and the precipitated magnesium ammonium phosphate can be recovered after a period of time.

[0014] The specific principle is as follows: Magnesium alloys slowly corrode in wastewater to release magnesium ions, and react with the ammonium and phosphate groups inherent in the wastewater to form magnesium ammonium phosphate crystals, which can strengthen the phosphorus removal effect and the nitrogen removal process, and realize the phosphorus removal of the wastewater. Denitrification dual role, the recovered magnesium ammonium phosphate contains both N and P.

[0015] The nitrogen content in the wastewater i...

Embodiment 2

[0021] A method for removing phosphorus in sewage based on magnesium alloy corrosion, including the following steps: in a rural wastewater treatment device, a magnesium alloy plate containing a certain quality of magnesium is immersed in the wastewater, and the precipitated magnesium ammonium phosphate can be recovered after a period of time .

[0022] The specific principle is as follows: Magnesium alloys slowly corrode in wastewater to release magnesium ions, and react with the ammonium and phosphate groups inherent in the wastewater to form magnesium ammonium phosphate crystals, which can strengthen the phosphorus removal effect and the nitrogen removal process, and realize the phosphorus removal of the wastewater. Denitrification dual role, the recovered magnesium ammonium phosphate contains both N and P.

[0023] The nitrogen content in the wastewater is 0.003mol / L, the phosphorus content is 0.00015mol / L, and the total amount of wastewater that needs to be treated is 10m³ / d.

...

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Abstract

The invention discloses a method for removing phosphorus from sewage on the basis of magnesium alloy corrosion. The method comprises the steps of immersing a magnesium alloy plate containing a certainmass of magnesium in wastewater rich in nitrogen and phosphorus, and recovering precipitated magnesium ammonium phosphate after a period of time. Since equilibrium potential (-2.37V) is relatively low, a magnesium metal is very easily corroded and dissolved out in an aqueous solution system; and magnesium ions required by crystallization of magnesium ammonium phosphate are provided by the slow corrosion of the magnesium alloy and react with ammonium and phosphate pre-existing in the wastewater to generate a magnesium ammonium phosphate crystal for resource recycling of phosphorus and nitrogen.

Description

Technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method for removing phosphorus from sewage based on magnesium alloy corrosion. Background technique [0002] The control of water eutrophication and the sustainable development of phosphorus resources are currently the two major research hotspots in the world focusing on phosphorus (P). On the one hand, with the rapid development of the world’s population and economy, a large amount of phosphorus-containing wastes are discharged into the environment, which not only causes a huge waste of resources, but also brings serious eutrophication problems to the water environment; As a non-renewable resource with limited reserves, phosphorus is becoming increasingly scarce with the massive exploitation and consumption of humans. Some researchers believe that if the current growth rate of phosphorus resource consumption continues to be maintained, the existing recoverable phosphate r...

Claims

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Application Information

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IPC IPC(8): C02F1/58C01B25/45C02F101/10C02F101/16
CPCC01B25/451C02F1/58C02F2101/105C02F2101/16
Inventor 丁彬彬薄涛黄赟芳
Owner 深圳市中涛环保工程技术有限公司
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