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System for treating cobalt-60 wastewater through two-stage induced crystallization and ultrafiltration

A technology for inducing crystallization and wastewater, applied in nuclear engineering, radioactive purification, etc., can solve the problems of inability to significantly reduce the pollution of ultrafiltration membranes, increase the difficulty and cost of treatment, and fine particles of insoluble salts, and achieve good solid-liquid separation effect. The effect of good environmental benefit and good economic benefit

Pending Publication Date: 2022-03-01
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the concentration of cobalt-60 in the actual wastewater is low, and it is often necessary to add a large amount of precipitant to improve the decontamination factor of cobalt ions, resulting in a high pH value of the effluent, and at the same time, the insoluble salt particles generated by the reaction are fine and solid-liquid Difficult to separate and can severely clog UF membranes
In order to solve this problem, flocculants are usually added to condense the dispersed particles into aggregates with larger particle sizes, improve the sedimentation effect of particles, and increase the removal rate of cobalt ions, but the addition of flocculants will not only increase the sludge production , increase the difficulty and cost of subsequent treatment, and can not significantly reduce the pollution of ultrafiltration membrane

Method used

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  • System for treating cobalt-60 wastewater through two-stage induced crystallization and ultrafiltration

Examples

Experimental program
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Effect test

Embodiment 1

[0028]Inducing the volume fraction of 2% induced by 2% in the primary and secondary induced crystalline reactor, and the molar ratio is 2: 1. Stable cobalt chloride was added to the simulated cobalt-60 wastewater of the primary isotope mixing tank, and the cobalt concentration was 5.0 mg / L, and the primary induced crystalline reactor was induced by mixing for 2 minutes, and induced the crystallization reactor to add 150 mg / L's NaOH, at 120S -1 The collision intensity was carried out for 20 min, precipitate 13 min, discharged into a secondary isotope mixing tank, and adjusted pH to 8.5 through hydrochloric acid, cobalt cobalt chloride to cobalt concentration of 5.0 mg / L, mixed for 2min as two Class-induced crystalline reactor water, add 120 mg / L NaOH to the secondary induced crystalline reactor, at 120s -1 The collision intensity was carried out for 20 min, precipitated for 13 min, discharged into the ultrafiltration unit, and was discharged after filtration of the ultrafil...

Embodiment 2

[0030] The volume fraction (calcium carbonate and cobalt hydroxide) induced by 3% in the primary and secondary induced crystalline reactor, and the molar ratio was 3: 1. Stable cobalt chloride was added to the simulated cobalt-60 wastewater of the primary isotope mixing tank, and the cobalt concentration was 5.4 mg / L, and the first stage induced crystalline reactor was transferred to the primary induced crystallization reactor to add 150 mg / L's NaOH, at 120S -1 The collision intensity was carried out for 20 min, precipitated for 10 min, discharged into a secondary isotope mixing tank, and adjusted pH to 8.8 by hydrochloric acid, cobalt chloride to cobalt concentration of 5.4 mg / L, mixed for 3 minutes as two Level induced crystalline reactor into water, add 60 mg / L NaOH in the secondary induced crystalline reactor, at 120s -1 The collision intensity was crystallized at 20 min, precipitated for 10 min, discharged into the ultrafiltration unit, and was discharged after being ...

Embodiment 3

[0032] The volume fraction (cobalt hydroxide) (cobalt hydroxide) induced by 5% in the crystalline reactor was introduced to the primary and secondary induced crystalline reactor, and the molar ratio was 4: 1. The steady cobalt chloride was added to the simulated cobalt-60 wastewater of the primary isotopic mixing tank, and the cobalt concentration was 5.5 mg / L, and after mixing for 2 min, it entered the primary induced crystalline reactor, and induced the crystalline reactor to add 200 mg / L's NaOH, at 120S -1 The collision intensity is 15 min, precipitated for 10 min, discharge the supernatant into the secondary isotope mixing tank, and the pH is adjusted by hydrochloric acid to 9, and cobalt chloride to cobalt concentration is 5.5 mg / L, mixed for 2min as two Level induced crystalline reactor water, add NaOH of 80mg / L in the secondary induced crystalline reactor, at 120S -1 The collision intensity was reflected for 15 min, precipitated for 10 min, discharged into the ultra...

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Abstract

The invention discloses a method and a device for treating cobalt-60 wastewater through secondary induced crystallization-ultrafiltration. And adding induced crystal seeds into the primary induced crystallization reactor and the secondary induced crystallization reactor. The method comprises the following steps: adding stable cobalt chloride into simulated cobalt-60 wastewater in a first-stage isotope mixing tank, mixing, feeding into a first-stage induced crystallization reactor, adding NaOH into the first-stage induced crystallization reactor, carrying out crystallization reaction and precipitation, discharging supernatant into a second-stage isotope mixing tank, adjusting the pH value by hydrochloric acid, adding cobalt chloride, mixing, and taking the mixture as second-stage induced crystallization inlet water, naOH is added into the second-stage induced crystallization reactor, after crystallization reaction and precipitation, supernate is discharged into an ultrafiltration unit, filtered through an ultrafiltration membrane assembly and then discharged. According to the method, the solid-liquid separation performance of the sludge is remarkably improved by adding the induction seed crystal, and the pollution of an ultrafiltration membrane is slowed down, so that the decontamination factor of the cobalt-60 is remarkably improved.

Description

Technical field [0001] The present invention belongs to the technical field of radioactive wastewater treatment, and a method of treating cobalt-60 wastewater, particularly a secondary inducing crystalline-ultrafiltration treatment of cobalt-60 wastewater. Background technique [0002] 60 Co is a reactive causing a loose and lack of fuel treatment processes, which are widely present in radioactive wastewater. Cobalt can enter the human body through a variety of pathways such as respiratory tract, digestive tract, skin and mucosa, which causes the liver, heart, dysfunction of the liver, heart, and gastrointestinal dysfunction and insomnia, deafness. Radioisotope 60 CO is a high toxic group, half-life is 5.27 years, and the gamma rays generated during the decay process release strong energy (1.17 and 1.33mev), destroying cell tissue or even destroying DNA, long-term radiation can also cause cancer, cataract, etc. . Cobalt-60 wastewater pollutes the ecological environment, threaten ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/06
CPCG21F9/06
Inventor 张光辉钟瑶瑶陈钰
Owner TIANJIN UNIV
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