Method for selectively removing and recovering copper in water by using membrane-assisted crystallization MAC process

A selective, water-recycling technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., it can solve the problems of MAC process removal and recycling processes that have not been reported, and achieve sustainable social development, reduce Dosage and the effect of avoiding membrane fouling

Inactive Publication Date: 2019-01-15
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the copper removal and recovery process based on the MAC process has not been reported

Method used

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  • Method for selectively removing and recovering copper in water by using membrane-assisted crystallization MAC process
  • Method for selectively removing and recovering copper in water by using membrane-assisted crystallization MAC process
  • Method for selectively removing and recovering copper in water by using membrane-assisted crystallization MAC process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] Embodiment 1: Adopt above-mentioned device to process the copper-containing waste water of 18.9mg / L, this waste water is configured by tap water, wherein, Ca 2+ : 26.3mg / L; Mg 2+ : 9.0 / L; K + : 3.4mg / L; Na + : 12.4mg / L. The treatment water volume of the device is 12.9L / h, the residence time of the crystallization reactor is 13 minutes (5 minutes of stirring, 8 minutes of precipitation), and the hydraulic residence time of the membrane separator is 30 minutes. Before the start of the experiment, 0.1wt% basic copper carbonate seed was added to the crystallization reactor. When the calculated sodium carbonate dosage was controlled at 104mg / L, the SI value was 2.76, and the remaining carbonate ion concentration was 41.1mg / L At this time, the copper concentration of the MAC process effluent is stable below 0.8mg / L, the turbidity is stable at 0.1NTU, and the pH of the effluent is 7.62±0.1. After treating 1800L of water, the recovered product is 0.24ml, that is, the concen...

Embodiment 2

[0088] Embodiment 2: Adopt above-mentioned device to process the copper-containing waste water of 29.5mg / L, this waste water is configured by tap water, wherein, Ca 2+ : 33.0mg / L; Mg 2+ : 8.9mg / L; K + : 3.4mg / L; Na + : 19..4mg / L. The treatment water volume of the device is 15L / h, the residence time of the crystallization reactor is 15 minutes (8 minutes of stirring, 15 minutes of precipitation), and the hydraulic residence time of the membrane separator is 40 minutes. Before the start of the experiment, 0.2wt% basic copper carbonate seeds were added to the crystallization reactor. When the calculated sodium carbonate dosage was controlled at 115mg / L, the SI value was 3.17, and the remaining carbonate ion concentration was 37.8mg / L At this time, the copper concentration of the MAC process effluent is stable below 1.295mg / L, the turbidity is stable at 0.1NTU, the pH of the effluent is 7.42±0.1, and the recovered product is dense Cu 2 (OH) 2 CO 3 crystal particles.

Embodiment 3

[0089] Embodiment 3: Adopt above-mentioned device to process the copper-containing waste water of 29.5mg / L, this waste water is configured by tap water, wherein, Ca 2+ : 33.0mg / L; Mg 2+ : 8.9mg / L; K + : 3.4mg / L; Na + : 19..4mg / L. The treatment water volume of the device is 15L / h, the residence time of the crystallization reactor is 15 minutes (8 minutes of stirring, 15 minutes of precipitation), and the hydraulic residence time of the membrane separator is 40 minutes. Before the experiment was started, 0.2wt% basic copper carbonate seeds were added to the crystallization reactor. When the calculated sodium carbonate dosage was controlled at 95mg / L, the SI value was 3.12, and the remaining carbonate ion concentration was 31.1mg / L At this time, the copper concentration of the MAC process effluent is stable below 1.895mg / L, the turbidity is stable at 0.1NTU, the pH of the effluent is 7.32±0.1, and the recovered product is dense Cu 2 (OH) 2 CO 3 crystal particles.

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Abstract

The invention discloses a method for selectively removing and recovering copper in water by using a membrane-assisted crystallization process, and the process is composed of two crystallization reactors which are operated in series and a membrane reactor. In order to ensure the purity of a precipitate and facilitate recovery and reutilization of Cu < 2 + >, Na2CO3 and Cu2(OH)CO3 are used as a precipitant and a seed crystal respectively (only 0.1-0.5wt% is added once at startup). Nucleation and crystal growth the Cu < 2 + > in the water mainly occur in the crystallization reaction. A membrane module in a membrane separator is mainly used for further crystallization and solid phase concentration. Under optimal process conditions, the Cu < 2 + > in the water is finally recycled in the form ofCu2(OH)CO3 crystal particles, and the purity is as high as 99%. Two key parameters of the operation of the process are: supersaturation index (SI <3.22) and excess carbonate (35mg/L <CO3<2-> <50mg/L), and the dosing amount of the precipitant can be adjusted according to effluent water quality requirements, so that the method has the advantages of saving resources and reducing costs, and has positive significance for promoting sustainable development of society.

Description

technical field [0001] The invention relates to the removal and recovery of copper ions in water, in particular to a method for removing copper in water and recovering copper by using a membrane-assisted crystallization process. Background technique [0002] The potential environmental, public health, and economic impacts of heavy metals such as copper, zinc, nickel, and cadmium have been major concerns over the past decades, with copper being an important component of untreated wastewater [1-3] . Although Cu 2+ Plays an important role in enzyme synthesis, human tissue and bone development, but excessive Cu 2+ May cause many harmful damages to human body and living organisms [4-6] , such as the Flintwater crisis caused by corrosion (chlorine induced) leaching of copper and lead from underground service lines and household plumbing fixtures due to lack of corrosion control treatments [7] . The World Health Organization has determined that Cu in drinking water 2+ The all...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/20
CPCC02F1/44C02F1/62C02F9/00C02F2001/5218C02F2101/20C02F2201/002C02F2209/005C02F2303/14
Inventor 董丽华顾平张光辉侯立安
Owner TIANJIN UNIV
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