Method for recovering phosphorus by synthesizing blue-iron stone by means of combination of capacitive deionization and anaerobic iron reduction

A technology of capacitive deionization and blue iron, applied in separation methods, anaerobic digestion treatment, chemical instruments and methods, etc., can solve problems such as difficult crystallization, achieve great application potential, simple device structure, and low operating costs

Inactive Publication Date: 2019-09-17
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The phosphorus recovery process of blue iron crystallization method requires a high initial phosphate concentration, but the concentration of phosphate in the influent and effluent water of sewage treatment plants is usually low at present, which is easy to cause crystallization difficulties

Method used

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  • Method for recovering phosphorus by synthesizing blue-iron stone by means of combination of capacitive deionization and anaerobic iron reduction
  • Method for recovering phosphorus by synthesizing blue-iron stone by means of combination of capacitive deionization and anaerobic iron reduction
  • Method for recovering phosphorus by synthesizing blue-iron stone by means of combination of capacitive deionization and anaerobic iron reduction

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Experimental program
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Effect test

Embodiment 1

[0031] The method for recovering phosphorus based on anaerobic iron reduction synthesis of blue iron, the steps are as follows:

[0032] (1) Dissolve 0.31g L with 1.8mM potassium dihydrogen phosphate solution -1 NH 4 Cl, 0.13g L -1 KCl, 1.64g L -1 Sodium acetate, 2.88g·L -1 Ferric citrate, add 5ml·L -1 Vitamin solution and 12.5ml·L -1 After the trace element solution, adjust the pH to 7.6-8.0 with NaOH solution and distribute it into anaerobic bottles;

[0033] Wherein, the composition of vitamin solution is as shown in Table 1, and the composition of trace element solution is as shown in Table 2;

[0034] (2) Add the wastewater microorganisms collected by centrifugation (3000rpm, 5min), and use the dissimilatory iron reduction of microorganisms to reduce the ferric iron in the anaerobic system to ferrous iron, and then the ferrous iron and phosphate combine to form blue iron;

[0035] (3) Determination of soluble and extractable ferric content, ferrous content and phosph...

Embodiment 2

[0043] Concentration process based on capacitive deionization technology, the steps are as follows:

[0044] (1) Build a capacitive deionization device: use carbon material as the electro-adsorption material, titanium mesh as the current collector, non-woven fabric material as the grid and a DC power supply to construct the capacitive deionization device. The size of the CDI unit is 7cm×3cm×7cm;

[0045] (2) Capacitive deionization: adjust the DC power supply voltage to 1.2V. Under the action of a DC electric field, when the 1.8mM potassium dihydrogen phosphate solution passes through the flow channel between the electrodes of the capacitive deionization component, the polarity of anion and cation in the water will The opposite electrode moves directional and attaches to the electrode. When the ions adsorbed on the electrode reach saturation, the phosphate ions adsorbed on the electrode are desorbed from the capacitor electrode under the action of the reverse electric field th...

Embodiment 3

[0048] Based on capacitive deionization combined with anaerobic iron reduction to synthesize blue iron phosphorus recovery method, the steps are as follows:

[0049] (1) Build a capacitive deionization device: use carbon material as the electro-adsorption material, titanium mesh as the current collector, non-woven fabric material as the grid and a DC power supply to construct the capacitive deionization device. The size of the CDI unit is 7cm×3cm×7cm;

[0050] (2) Capacitive deionization: adjust the DC power supply voltage to 1.2V. Under the action of a DC electric field, when the 1.8mM potassium dihydrogen phosphate solution passes through the flow channel between the electrodes of the capacitive deionization component, the polarity of anion and cation in the water will The opposite electrode moves directional and attaches to the electrode. When the ions adsorbed on the electrode reach saturation, the phosphate ions adsorbed on the electrode are desorbed from the capacitor el...

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Abstract

The invention discloses a method for recovering phosphorus by synthesizing blue-iron stone by means of combination of capacitive deionization and anaerobic iron reduction. The method comprises the steps of firstly, using a capacitive deionization technology to recover phosphorus-containing concentrated water by means of reverse desorption; then, synthesizing the blue-iron stone in the phosphorus-containing concentrated water by means of microbial allochemical iron reduction of an anaerobic system. The method concretely comprises the following steps: firstly, constructing a capacitive deionization device; then, carrying out capacitive deionization; finally, synthesizing the blue-iron stone and recovering. The method for recovering the phosphorus by obtaining blue-iron stone crystal by means of combination of the capacitive deionization technology and anaerobic iron reduction has an important significance for solving the problems of the treatment of phosphorus-containing wastewater and the crisis of phosphate rock resources.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment and resource utilization thereof, and relates to a phosphorus recovery method for synthesizing blueite by capacitive deionization combined with anaerobic iron reduction. Background technique [0002] Phosphorus is the basic element that constitutes all life and is an essential nutrient element for the growth of all living things. However, the rapid mining and consumption of phosphate rock has caused the crisis of phosphorus resource depletion, making phosphorus one of the limiting factors for human development. While phosphate rock resources are facing a crisis, organic phosphorus and inorganic phosphorus discharged to natural water bodies through sewage are increasing day by day, causing serious deterioration of surface water environmental quality. Based on the special physical and chemical properties of phosphorus, it is almost impossible to complete the transfer from water to lan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C01B25/37C02F1/469C02F101/10
CPCC01B25/375C02F1/4691C02F1/66C02F3/28C02F9/00C02F2101/105
Inventor 李楠王聪赵倩王舒
Owner TIANJIN UNIV
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