Technological process for struvite extraction in seawater desalination process

A technological process and struvite technology, which is applied in the field of struvite extraction process, can solve problems such as reactor damage, achieve the effects of reducing the pressure before the membrane, avoiding environmental pollution, and reducing the use of medicines

Pending Publication Date: 2021-07-13
NANJING HYDRAULIC RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the biggest problem faced in the process of front-end intervention is that the pumping of concentrated seawater into the reactor can easily cause damage to the reactor

Method used

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  • Technological process for struvite extraction in seawater desalination process
  • Technological process for struvite extraction in seawater desalination process
  • Technological process for struvite extraction in seawater desalination process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Synthesis of a reversible polymer material complexing metal ions, polyacrylic acid-ethylene glycol phosphate-polyfurfuryl alcohol interpenetrating network:

[0033] 1) Synthesis of furfuryl alcohol resin (PFA): add 100 g of furfuryl alcohol into a round bottom flask, add 20 ml of deionized water, heat and stir under a nitrogen atmosphere, and control the temperature at 60° C. for 30 minutes. Afterwards, 5ml of concentrated sulfuric acid was diluted to 30ml, and gradually added dropwise to the flask, controlling the temperature at 70-80°C. Cool down to room temperature, add ammonia water to adjust the pH to neutral, centrifuge the product, and dry it under vacuum overnight;

[0034] 2) Synthesis of polyacrylic acid-acrylcystamine (PAA-PACA): Add 1 g of acrylic acid and 100 ml of deionized water into a round-bottomed flask, heat and stir under a nitrogen atmosphere, and control the temperature at 75° C. for 30 minutes. 20 g of acrylic acid and an equivalent amount of amm...

Embodiment 2

[0037] Other parts are identical with embodiment one, adopt the product polyacrylic acid-acrylcystamine-polyfurfuryl alcohol interpenetrating network coating formulation of embodiment one and spray sample preparation to include the following:

[0038] The above paint components are: water: 12, PAA-PACA-PFA: 40, defoamer: 1-3, dispersant 1-3, titanium dioxide: 10, thickener: 0.2, film-forming aid: 3, Barium sulfate: 10, water-based epoxy resin: 30, add deionized water and the above ratio of raw materials in the table into the dispersion tank, after the dispersion is uniform, grind on the machine until the particle size is less than 30 μm; after grinding and degreasing the cold-rolled steel plate, put The paint is sprayed onto the sample plate at a speed of 0.3ml / s, the wet film thickness is ~75μm, and dried in a 50-degree oven.

Embodiment 3

[0040] The struvite reaction device includes: PAA-PACA-PFA packed column and reactor. The inner wall of the pipeline, the sand filter, and the stirring paddle are all sprayed with PAA-PACA-PFA;

[0041] The struvite reactor adopts a stirred reactor, and the reactor mainly includes 20-30m 3 Two concentration tanks, using solar photovoltaic cells to assist distillation and concentration, the purified distilled water is used for industrial distilled water, 3m 3 There are 3 reaction kettles, 3 discharge and feed pumps, 4 metering pumps, 1 centrifuge, and the water passing equipment are all sprayed and coated with PAA-PACA-PFA.

[0042] The PAA-PACA-PFA packed column is a PAA-PACA-PFA mixed SiO with the same diameter as the pipe and a length of 5cm connected before the reactor. 2 Packed columns of particles.

[0043] Use a rotary evaporator to evaporate and concentrate the concentrated seawater to 1 / 10 of its original volume, take an appropriate amount of concentrated solution, ...

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Abstract

The invention relates to a technological process for struvite extraction in a seawater desalination process, and belongs to the technical field of seawater desalination. The technological process comprises the following steps: synthesizing a polyacrylic acid-ethylene glycol phosphate-polyfurfuryl alcohol interpenetrating network; preparing a coating; brushing a steel plate; constructing a reaction device; and producing struvite. The method has the beneficial effects that the concentrated seawater is treated in an auxiliary manner by utilizing a special functional group modified coating technology, and an EWT reagent is effectively replaced, so that the process flow is simplified, and the use of drugs is reduced; the metal inner wall of the reaction kettle is protected from electrochemical corrosion, and an electromagnetic complexing agent is not used, so that environmental pollution is avoided; and the pre-membrane pressure is obviously reduced, and the method is easy to popularize.

Description

technical field [0001] The invention belongs to the technical field of desalination of seawater, and in particular relates to a process flow for extracting struvite while desalinating seawater. Background technique [0002] In recent years, the global freshwater resources are increasingly scarce, coupled with the continuous progress of seawater desalination technology, asking for freshwater from the sea to alleviate the increasingly serious global water crisis has not only formed a consensus in the global scientific and technological circles, but also has become the government's proposition and advocacy of various coastal countries. Countermeasures for developing new water sources. Seawater desalination, as an alternative and incremental technology for freshwater resources, has received more and more attention and support, and has become a feasible solution and an important way to solve the global water crisis in the future. [0003] Although my country's seawater desalinat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45C08F8/34C08F120/06C08G16/02C09D163/00C09D133/02C09D161/00C09D5/08B01J19/02C05B17/00C02F9/10C02F103/08
CPCB01J19/02C01B25/451C02F1/001C02F1/04C02F1/441C02F1/442C02F1/444C02F1/58C02F9/00C02F2103/08C05B17/00C08F8/34C08G16/02C08L2205/03C09D5/08C09D163/00C08F120/06C08L33/02C08L61/00
Inventor 王晓刚阮仕平徐世凯程锐李昂杨彦于璐郭风赵金箫张睿王彤彤陈健王勇武秀侠丁文浩董波杨宇祝龙周杰
Owner NANJING HYDRAULIC RES INST
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