Schwertmannite for removing phosphorus in sewage and efficient synthesis method of Schwertmannite

A Shishi mineral, high-efficiency technology, applied in the direction of water pollutants, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of harsh conditions and procedures, long process flow, low synthesis efficiency, etc., to achieve low cost, The effect of convenient operation and improved synthesis efficiency

Pending Publication Date: 2021-06-15
NANJING AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the following technical bottlenecks faced by the existing sewage adsorption method for phosphorus removal: the preparation method, conditions and procedures of the adsorption material are relatively strict and complicated, and the cost is high. Material - Shi's minerals; further, the present invention also provides a new method for efficiently synthesizing Shi's minerals with acid mine wastewater as raw material, which overcomes the low synthesis efficiency, long process flow and cost of existing Shi's minerals. high disadvantage

Method used

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  • Schwertmannite for removing phosphorus in sewage and efficient synthesis method of Schwertmannite
  • Schwertmannite for removing phosphorus in sewage and efficient synthesis method of Schwertmannite
  • Schwertmannite for removing phosphorus in sewage and efficient synthesis method of Schwertmannite

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Embodiment 1

[0038] In this embodiment, the process of efficiently synthesizing Shi's minerals from acidic mine wastewater includes the following steps:

[0039] (1) Filter out impurities: filter out suspended particles in acid mine wastewater. The water sample used in this example was collected from acid mine wastewater discharged from a pyrite smelter in South China, with a pH of 2.72 and a dissolved iron content of 895 mg / L, of which Fe 2+ The content is 436mg / L, SO 4 2- Content 5200mg / L.

[0040](2) Alkali regulates the formation of Shi's minerals: the filtered wastewater was aerated for 2 days, added caustic soda (1.5g / L), stirred at 150rpm for 3h, the pH of the measurement system was 3.82, and the total iron precipitation rate was 98 %, to obtain precipitate;

[0041] (3) Mineral collection: the obtained precipitate was collected by filtration with a 0.45 μm filter membrane, washed with dilute sulfuric acid (pH=4.0) and deionized water for 2 times, and dried in a drying oven at 6...

Embodiment 2

[0058] The process of efficiently synthesizing Shi's minerals from acid mine wastewater and the application of phosphorus removal in wastewater includes the following steps:

[0059] (1) Filtration to remove impurities: the water sample used in this example is collected from an acid reservoir downstream of a metal mine open-pit mining plant in the Jianghuai area, with a pH of 2.12 and a soluble iron content of 1260 mg / L, SO 4 2- Content 6000mg / L, filter to remove suspended particles in acid mine wastewater.

[0060] (2) Alkali regulates mineral formation: the filtered acidic mine wastewater was aerated for 3 days, added magnesium oxide (5g / L), stirred at a stirring speed of 100rpm for 5h, the pH of the measurement system was 2.86, and the total iron precipitation rate was 90 %, to obtain precipitate;

[0061] (3) Mineral collection: The obtained precipitate was collected by filtration with a 0.45 μm filter membrane, washed with sulfuric acid solution (pH=3.0) and deionized w...

Embodiment 3

[0064] The process of efficiently synthesizing Shi's minerals from acid mine wastewater and the application of phosphorus removal in wastewater includes the following steps:

[0065] (1) Filtration to remove impurities: the water sample used in this example is collected from the acid pit water of a copper smelter in the Jianghuai area, with a pH of 1.69, a soluble iron content of 1600 mg / L, and SO 4 2- Content 6800mg / L, filter to remove suspended particles in acid mine wastewater.

[0066] (2) Alkali regulates mineral formation: the filtered acidic mine wastewater was aerated for 1 day, added liquid caustic soda (1.2g / L), stirred at a stirring speed of 300rpm for 4h, the pH of the measurement system was 2.0, and the total iron precipitation rate was about 92%, obtain precipitate;

[0067] (3) Mineral collection: The obtained precipitate was collected by filtration with a 0.45 μm filter membrane, washed with sulfuric acid solution (pH=2.5) and deionized water for 3 times, dri...

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Abstract

The invention provides a Schwertmannite for removing phosphorus in sewage and an efficient synthesis method of Schwertmannite. The method comprises the following steps: regulating and strengthening oxidation, hydrolysis and mineralization reaction of soluble iron in acid mine wastewater by adding a small amount of alkaline substances, thereby greatly improving the synthesis efficiency (the primary mineralization rate is greater than 90%) of the Schwertmannite . The defects of low synthesis efficiency, long technological process and high cost of the Schwertmannite in the prior art are overcome. Meanwhile, the Schwertmannite synthesized based on alkali regulation and control can generate strong physical and chemical adsorption on phosphorus in phosphorus-rich sewage, sulfate in a mineral phase can also be exchanged with phosphate, the phosphorus adsorption performance is excellent (the adsorption capacity is 19.9 mg / g), and the Schwertmannite is a novel sewage phosphorus adsorption / phosphorus removal material with a great application prospect.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment and resource recovery, and in particular relates to a Shi's mineral used for dephosphorization of sewage and a high-efficiency synthesis method thereof. Background technique [0002] Phosphorus is an indispensable and important nutrient element for all organisms, and it is also a non-renewable non-metallic mineral resource. In recent years, due to the increasing demand for phosphate fertilizers in agricultural production and the rapid development of the phosphorus chemical industry, a large amount of phosphorus has been lost from the environment, and about 80% of it has been discharged with sewage. This has not only led to the increasingly serious problem of eutrophication in water bodies, but also aggravated the "phosphorus crisis" caused by the shortage of phosphorus deposits to a large extent. Therefore, removing or recovering phosphorus from phosphorus-rich sewage and realizing ...

Claims

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Application Information

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IPC IPC(8): C01G49/14C02F1/28C02F1/42C02F1/72B01J20/06B01J20/30C02F101/10C02F101/30
CPCB01J20/06C01G49/14C01P2002/72C01P2002/82C01P2004/03C02F1/281C02F1/42C02F1/722C02F2001/422C02F2101/105C02F2101/30C02F2305/026
Inventor 方迪刘兰兰周立祥
Owner NANJING AGRICULTURAL UNIVERSITY
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