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A resource treatment method and device for organic acid wastewater containing heavy metal ions

A technology of heavy metal ions and organic acids, applied in water/sewage treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc., can solve problems such as the decline of extraction efficiency, achieve improved purity, good large-scale application prospects, and devices simple effect

Active Publication Date: 2017-05-17
有研资源环境技术研究院(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the problem with extraction is that as the concentration of ions in the solution decreases, the extraction efficiency drops rapidly

Method used

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  • A resource treatment method and device for organic acid wastewater containing heavy metal ions

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Embodiment 1 Recycling treatment device for organic acid wastewater containing heavy metal ions

[0033] Such as figure 1 As shown, the resource treatment device for organic acid wastewater containing heavy metal ions includes a hydrophobic membrane distillation component 1, a membrane distillation feed liquid tank 5, a circulating condensate tank 6 and an extraction reaction tank 9;

[0034] The organic acid wastewater containing heavy metal ions is contained in the membrane distillation feed liquid tank 5, two liquid outlets are arranged at the bottom, two liquid inlets are arranged at the top, and a pH monitor 81 is arranged in the tank;

[0035] The hydrophobic membrane distillation module 1 has a feed liquid inlet, a concentrated liquid outlet, a condensed water outlet, and a condensed water circulation inlet; the first liquid outlet of the membrane distillation feed tank 5 is connected to the hydrophobic membrane distillation The feed liquid inlet of module 1, th...

Embodiment 2

[0037] Example 2 Recycling treatment of citric acid wastewater containing heavy metal ions such as iron, zinc, copper, and nickel

[0038] Adopt method of the present invention to process iron-containing (Fe 2+ , Fe 3+ ), zinc (Zn 2+ ), copper (Cu 2+ ), nickel (Ni 2+ ), calcium (Ca 2+ ), sodium (Na + ) and other metal ions of citric acid wastewater. The pH value of the wastewater is 2.6, and the contents of other metal ions in the wastewater are shown in Table 1. In the membrane distillation concentrated wastewater section, the operation mode of membrane distillation is direct contact membrane distillation, and the membrane distillation module is a hollow fiber membrane module made of PVDF material, with an average membrane pore size of 0.15 μm. Using the device described in Example 1, the process is as follows: first, in the membrane distillation concentrated wastewater section I, the wastewater is exported from the membrane distillation feed liquid tank 5 and heated t...

Embodiment 3

[0043] Example 3 Recycling treatment of EDTA wastewater containing heavy metal ions such as lead, cadmium and cobalt

[0044] Adopt method of the present invention to handle cadmium (Cd 2+ ), cobalt (Co 2+ ), calcium (Ca 2+ ), ETDA wastewater such as metal ions. The pH value of the wastewater is 3.5, and the contents of other metal ions in the wastewater are shown in Table 2. In the membrane distillation concentrated wastewater section, the operation mode of membrane distillation is direct contact membrane distillation, and the membrane distillation module is a hollow fiber membrane module made of PTFE material, with an average membrane pore size of 0.16 μm. Using the device described in Example 1, the process is as follows: first, in the membrane distillation concentrated wastewater section I, the wastewater is exported from the membrane distillation feed liquid tank 5 and heated to 50°C by the heat exchanger 31, and the hot feed liquid flows through the membrane The dist...

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Abstract

The invention discloses a recycling processing method and device of heavy metal ion-containing organic acid wastewater by use of membrane distillation and extraction coupling technology, by combination of membrane distillation and extraction related equipment, a two-stage process system is developed, the process includes a membrane distillation wastewater concentration work segment and a solvent extraction heavy metal extraction work segment; heated wastewater is concentrated to a certain ratio in the membrane distillation wastewater concentration work segment, concentrated liquor enters the solvent extraction heavy metal extraction work segment by wastewater recycling equipment, and heavy metals are extracted in the solvent extraction heavy metal extraction work segment, and are separated by selective reverse extraction. By organic combination of the membrane distillation technology and the extraction technology, organic acid wastewater can be highly concentrated by use of the advantage of the membrane distillation technology, the valuable heavy metals in the wastewater can be maximumly intercepted, the heavy metal recovery rate of the subsequent extraction process can be improved, the purity of reusable organic acids can be improved, and heavy metals and reusable organic acids in the heavy metal ion-containing organic acid wastewater can be effectively separated and recovered.

Description

technical field [0001] The invention belongs to the technical field of industrial water treatment, in particular to a method for recycling organic acid waste water containing heavy metal ions by using membrane distillation and extraction coupling technology. Background technique [0002] Newly built boilers in large-scale thermal power plants and boilers that have been in operation for 3 to 4 years must be cleaned. In order to reduce damage to the boiler body, weak acids such as citric acid and EDTA are currently used to clean boilers; in addition, there are also reports in the project process Organic acids are used to clean metal catalysts. During the cleaning process, a large amount of organic acid cleaning wastewater will be produced. This type of wastewater not only has a high COD content, but also contains a large amount of heavy metal ions, such as iron, copper, nickel, vanadium, etc. If this type of wastewater is directly discharged or treated improperly, it will not ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/02C02F1/08C02F1/26C02F1/62
Inventor 纪仲光李岩徐政王巍杨丽梅
Owner 有研资源环境技术研究院(北京)有限公司
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