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Method for processing electroplating wastewater with organic functional fibers

A technology of electroplating wastewater and functional fibers, which is applied in the fields of metallurgical wastewater treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc.

Inactive Publication Date: 2012-02-15
HENAN ACADEMY OF SCI CHEM RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, organic functional fibers are used to treat electroplating wastewater containing single or multiple heavy metal ions of copper, nickel, zinc or chromium, and there is no relevant literature report

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Taking the electroplating wastewater from an electroplating factory in Shenzhen as the original solution, the contents of copper, nickel, and zinc in the wastewater measured by atomic absorption spectroscopy were 320mg / L, 127mg / L, and 1.9mg / L, respectively, and the pH value of the wastewater was about 3. Rinse the adsorption column packed with 1.0g polyacrylonitrile fibers containing carboxylic acid groups (carboxyl content 3.0-8.0 mmol / g) with water and remove air bubbles, then pump the electroplating wastewater into the fibers at a flow rate of 2-3mL / min from bottom to top adsorption column. The treatment volume is 80mL, and the contents of copper, nickel and zinc in the effluent after treatment are 0.074mg / L, 0.490mg / L and 0.014mg / L respectively, reaching the pollutant discharge specified in the "Electroplating Pollutant Discharge Standard" (GB 21900-2008) Limits, i.e. total copper < 0.5 mg / L, total nickel < 0.5 mg / L, and total zinc < 1.5 mg / L. After the fiber adsor...

Embodiment 2

[0018] Other adsorption operating conditions are the same as in Example 1, the electroplating wastewater is replaced with wastewater prepared in the laboratory, the initial content of copper, nickel, and zinc is 100 mg / L, and the pH value is 3. The test results of the treated effluent are 0.03mg / L, 0.19mg / L, 0.32mg / L, and the desorption rate is over 90%. The treated effluent can be directly discharged up to the standard or used for the preparation of the next batch of desorbents.

Embodiment 3

[0020] Taking the electroplating wastewater from an electroplating workshop in Zhengzhou as the original solution, the total chromium content in the wastewater was 53 mg / l and the pH value of the wastewater was 8 as measured by atomic absorption spectroscopy. Rinse the adsorption column packed with 1.5 g polyacrylonitrile fibers containing amine groups (amine group content 3.0-6.0 mmol / g) with water and remove air bubbles, then pump the electroplating wastewater into the fibers at a flow rate of 5 mL / min from bottom to top adsorption column. The treatment volume is 1.1 L / batch, and the total chromium content in the effluent after treatment is less than 0.5 mg / L, which meets the pollutant discharge limit specified in the "Electroplating Pollutant Discharge Standard" (GB 21900-2008), that is, the total chromium is less than 1.0 mg / L L. After the fiber adsorption is saturated, 100 mL of NaOH solution with a molar concentration of 0.1 mol / L is used to desorb the fiber adsorption ...

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PUM

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Abstract

The invention discloses a method for processing electroplating wastewater with organic functional fibers, belonging to the technical field of industrial waste water processing, comprising the following steps: at room temperature, filtering mechanical impurities from the electroplating wastewater through a pre-filter unit, letting the electroplating wastewater fully contact with an adsorption bed filled with organic functional fibers from bottom to top to remove heavy metal ions from the electroplating wastewater, so as to get effluent which reaches the direct discharge standard; carrying out the desorption on the saturated organic functional fibers with diluted acid or sigwater, and washing with water until neutrality, so that the processed organic functional fibers are recycled for the adsorption of electroplating wastewater, and the highly condensed eluent is used for recovering heavy metal ions. The method has the advantages of simple process flow, convenient operation, stable effects, small investment, recycled fibers and the like, can be used for purifying the electroplating wastewater containing copper, nickel, zinc, chromium and other single or multiple heavy metal ions, and the processed effluent reaches the discharge standard of electroplating pollutants.

Description

technical field [0001] The invention relates to a new method for treating electroplating wastewater, in particular to a method for treating electroplating wastewater containing single or multiple heavy metal ions by using organic functional fibers, and belongs to the technical field of industrial wastewater treatment. Background technique [0002] Electroplating is one of the three major polluting industries in the world today. In 1994, it was listed as one of the 25 restricted industries by the Chinese government. Therefore, while the electroplating industry is constantly developing new cleaning processes, it is working hard on the research of electroplating wastewater treatment technology. Electroplating wastewater has the characteristics of complex water quality, strong toxicity, and large discharge volume. The main pollutants are heavy metal ions. Once they enter the environment, they will definitely cause extensive and serious harm to the ecological environment and huma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02C02F103/16
Inventor 赵亮沙保峰王静张小转黄做华曹继红秦小朵
Owner HENAN ACADEMY OF SCI CHEM RES INST CO LTD
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