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Special apparatus for removing heavy metal ions in wastewater, and method thereof

A technology of heavy metal ions and special devices, applied in chemical instruments and methods, water pollutants, adsorbed water/sewage treatment, etc., can solve problems such as failure to achieve pollution control effects, secondary pollution, etc., achieve the effect of promoting adsorption, and be easy to process , cheap effect

Active Publication Date: 2015-04-22
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, most industrial wastewater treatment technologies will cause secondary pollution, such as the electroplating sludge generated during the electroplating wastewater treatment process and the discharged wastewater with high salt content; Contains a large amount of arsenic, copper and other heavy metal ions
These have transformed water pollution into soil pollution, failing to achieve fundamental pollution control effects

Method used

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  • Special apparatus for removing heavy metal ions in wastewater, and method thereof
  • Special apparatus for removing heavy metal ions in wastewater, and method thereof
  • Special apparatus for removing heavy metal ions in wastewater, and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The preparation of embodiment 1 filler

[0041] The natural pyrophyllite whose particle size range is less than 0.18mm is used as the raw material, and the N-2 (aminoethyl) 3-aminopropylmethyldimethoxysilane coupling agent is used as the modifying agent.

[0042] Add 0.8g of aminosilane coupling agent to a 50ml beaker, then slowly add 0.95g of deionized water dropwise, and stir at room temperature until the solution is uniform and clear to obtain the hydrolyzed product of the silane coupling agent (CH 3 Oh) 2 CH 3 SiC 3 h 6 NHC 2 h 4 NH 2 . Add absolute ethanol with a volume final concentration of 50% to the hydrolyzate for dilution, as a pyrophyllite surface modifier.

[0043] Put pyrophyllite into an agate jar (the milling medium is agate balls), and use a QM-3SP4 planetary ball mill to perform mechanical ball milling at 500r / min (forward and reverse / 5min), and the ball milling time is 6h to obtain pyrophyllite powder; 50g of pyrophyllite powder is pre-dried ...

Embodiment 2

[0049] (1) Special device for wastewater treatment ( figure 2 ): The special device for wastewater treatment is composed of three wastewater treatment equipment units respectively provided with water outlets and water inlets connected in series, the outlet of the former wastewater treatment equipment is connected with the water inlet of the latter wastewater treatment equipment; the wastewater processing equipment unit ( figure 1 ) includes a water inlet 1, a water outlet 4, and a filling chamber 3 (80 mm in height and 55 mm in diameter) is provided inside the waste water treatment equipment unit, the water outlet is located near the upper part of the waste water treatment equipment unit, and the water inlet is located in the waste water treatment unit The equipment unit is close to the lower part. The filling chamber is located at the lower edge of the water outlet and extends to the lower edge of the water inlet. The water quality detection port 5 is provided at the water o...

Embodiment 3

[0060] Wastewater treatment special device and treatment method, adsorbent recovery method are the same as embodiment 2, change waste water into waste water containing 20mg / L, 50mg / L copper ion;

[0061] The metal ion recovery method is the same as that in Example 2, with the copper plate as the cathode and the graphite electrode as the anode, and conduct electrodeposition in a constant temperature water bath at 60°C. After the electrodeposition is complete, wash the cathode (copper plate) with deionized water and absolute ethanol in sequence , dry to obtain elemental copper, and the recovery rate of copper can reach 90%.

[0062] The treatment of the electrolytic solution after the electrolysis and the washing solution after the backwashing of the magnetite filter material is the same as in Example 2, adding a high-concentration sodium hydroxide solution until the precipitation does not separate out to remove iron ions.

[0063] In order to detect the content of copper ions i...

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Abstract

The invention discloses a special apparatus for removing heavy metal ions in wastewater, and a method thereof. The method comprises the following steps: filling pyrophillite-reduced iron powder mixed powder into a first wastewater treatment device in order to realize preliminary treatment of heavy metals; filling silane coupling agent modified pyrophillite into a second wastewater treatment device in order to adsorb heavy metal ions not subject to the preliminary treatment and iron ions generated in the first wastewater treatment device; filling a magnetite filler into a third wastewater treatment in order to remove the iron ions generated in the first wastewater treatment device and pyrophillite or modified pyrophillite powder mixed in water; and carrying out an electrochemical process to recover the heavy metals. The treatment effect of the heavy metal ions in industrial wastewater can reach above 98% in the invention. Adsorption-saturated pyrophillite and modified pyrophillite are cleaned by an acidic solution in order to desorb above 70% of the heavy metal ions, and cleaned pyrophillite and cleaned modified pyrophillite are subject to alkaline activation for recycle, so the purposes of energy saving, emission reduction and full resource utilization are realized.

Description

(1) Technical field [0001] The invention relates to a method for recovering heavy metal ions in waste water, in particular to a special device for removing heavy metal ions in waste water and a method for recycling heavy metal ions, pyrophyllite and modified pyrophyllite. (2) Background technology [0002] With the rapid development of my country's industrialization and urbanization process, a large amount of discharge of heavy metal wastewater has made the heavy metal pollution in water sources and soil more acute, and it is urgent to strengthen the prevention and control of water pollution. Industrial wastewater containing heavy metal ions mainly comes from mining, electroplating, machining, metal smelting and some chemical industries. Wastewater usually contains Pb, Cu, Cr, Hg, Cd, As, Zn, Co, Ni, Sn, V, etc. These pollution components are different from organic pollutants. When they are discharged into the environment, they cannot be degraded into harmless high-end prod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06B01J20/12C02F1/66C02F1/28C02F1/70C02F101/20
Inventor 李国华任晓青
Owner ZHEJIANG UNIV OF TECH
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