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Green rust material for fixing anaerobic lake sediment phosphate as well as preparation method and application thereof

A phosphate and lake technology, applied in anaerobic digestion treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problem of weakening the long-term stable fixation of phosphorus, and achieve the effect of efficiently repairing phosphorus pollution

Pending Publication Date: 2020-05-15
GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the anoxic sediment environment, microbially driven iron-reductive dissolution of these Fe-based sorbents is inevitable, resulting in the re-release of immobilized P, thus weakening the long-term stable fixation of P in water.

Method used

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  • Green rust material for fixing anaerobic lake sediment phosphate as well as preparation method and application thereof
  • Green rust material for fixing anaerobic lake sediment phosphate as well as preparation method and application thereof
  • Green rust material for fixing anaerobic lake sediment phosphate as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: the preparation of three kinds of patina

[0036] 1. Synthesis and preparation of chloride ion intercalation green rust (GR(Cl))

[0037] Step 1): At room temperature, take a 250mL blue cap bottle and add 50mL NaOH (1mol / L) aqueous solution. Weigh 6.96gFeCl 2 4H 2 O (about 0.035mol) was mixed with it, and after putting it into the D8*45 stirring bar, quickly added 150mL of deionized water. Obtain Fe(OH) with a total volume of 200mL 2 Suspension. In this example, the Fe(II) / OH molar ratio was 0.7.

[0038] Step 2): open magnetic stirring to make Fe(OH) 2 Partially oxidized. Adjust the speed to 420-450r / min. Put in a pH meter to check. And press the stopwatch to start timing. When the pH is about 7.3 and the time is about 107 min, stop the reaction.

[0039] Step 3): Immediately put into a 250mL reagent bottle, shake vigorously and then transfer to the glove box to prevent GR(Cl) from continuing to oxidize. Open the lid of the reagent bottle in a...

Embodiment 2

[0049] Embodiment 2: different green rust (GR (Cl), GR (SO 4 ), GRCO 3 ) Composite materials to remove phosphate

[0050] Step 1): Prepare a phosphorus solution with a concentration of 10 mg / L, and the solvent is deionized water.

[0051] Step 2): The three green rust composite materials prepared in Example 1 were used for phosphorus adsorption kinetics and isotherms. The green rust dosage was 0.2g / L, the reaction system was 40mL, and the pH was 7.5. React anaerobically in a 50 mL centrifuge tube.

[0052] Step 3): Start timing after feeding, and take samples at specified time points. The sampling times are 0, 2, 5, 10, 30, and 60 minutes respectively. The isotherm samples were all reacted for 60 minutes.

[0053] Step 4): After the reaction, the reaction mixture is passed through a 0.22 μm water film, and the concentration of phosphorus in the filtrate is measured to calculate the removal rate (C / C 0 ) and adsorption capacity, the results are as image 3 shown.

Embodiment 3

[0054] Embodiment 3: Different green rusts (GR(Cl), GR(SO) under different pH conditions 4 ), GRCO 3 ) Composite materials to remove phosphate

[0055] Step 1): Prepare a phosphorus solution with a concentration of 10 mg / L, and the solvent is deionized water.

[0056] Step 2): Take the three kinds of patina composite materials prepared in Example 1 for phosphorus adsorption, the dosage of patina is 0.2g / L, and the reaction system is 40mL, adjust the pH to 5.5-9.5 with 0.01M HCl and NaOH respectively, React anaerobically in a 50 mL centrifuge tube.

[0057] Step 3): Start timing after feeding, and take samples after 60 minutes of reaction.

[0058] Step 4): After the reaction, pass the reaction mixture through a 0.22 μm water film, measure the concentration of phosphorus in the filtrate, and calculate the removal rate. The results are as follows: Figure 4 shown.

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Abstract

The invention belongs to the technical field of sewage treatment, and particularly discloses a green rust material for fixing anaerobic lake sediment phosphate as well as a preparation method and application thereof. The method comprises the following steps: stirring Fe(OH)2 turbid liquid to oxidize Fe(OH)2 to obtain turbid liquid containing Fe(OH)2 and Fe(OH)3; continuously stirring in an oxygen-free environment to remove O2 in the turbid liquid, and filtering and washing the turbid liquid to obtain the green rust material. The prepared green rust can stably exist under an anaerobic condition; the green rust has a strong performance on combining phosphate, meanwhile, the structure of the green rust under the anaerobic condition is further stabilized through adsorption of phosphate, and the long-term fixing effect on phosphorus in the bottom mud can be achieved. Therefore, the problem that other ferric minerals are reduced under anaerobic conditions to release iron and phosphorus is solved; and the green rust is an iron-based ore and has the characteristic of selectively adsorbing phosphate, so that the green rust is not easily influenced by other interfering ions.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a green rust material for fixing anaerobic lake sediment phosphate, a preparation method and application thereof. Background technique [0002] Phosphorus (P) is an essential nutrient for all organisms, but when the phosphorus content in the aquatic environment is too high, it will lead to eutrophication of the water body, cause a large number of algal blooms in the water body, and destroy the ecological balance of the water body. Previous studies have shown that lake sediments composed of different minerals, such as Fe / Al oxides, can bind P on the surface of these minerals through ion exchange, which can fix P in water, especially Fe(III) oxides. P plays a key role in water bodies. However, on the one hand, the iron-aluminum mineral content in water body sediments is low, and the fixation effect on P is limited; The process often occurs, leading to the dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28
CPCC02F3/2806
Inventor 方利平刘凯李芳柏
Owner GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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