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Method for synchronous complex breaking and heavy metal removal based on self-strengthening ozone

A heavy metal, complex breaking technology, applied in chemical instruments and methods, oxidized water/sewage treatment, water/sewage multi-stage treatment, etc. and TOC removal, easy operation and high efficiency

Active Publication Date: 2016-04-20
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems in the prior art that the methods of chemical precipitation, adsorption separation, and iron filings reduction are poor in the treatment of heavy metal complexes, and advanced oxidation technologies such as photochemical oxidation and electrochemical oxidation are difficult to apply industrially, the present invention provides A method for self-enhanced ozone decomplexation and simultaneous removal of heavy metals

Method used

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  • Method for synchronous complex breaking and heavy metal removal based on self-strengthening ozone
  • Method for synchronous complex breaking and heavy metal removal based on self-strengthening ozone
  • Method for synchronous complex breaking and heavy metal removal based on self-strengthening ozone

Examples

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Effect test

Embodiment 1

[0041] A kind of self-strengthening ozone decomplexation and the method for synchronously removing heavy metals of the present embodiment, heavy metal A and complexing agent B are copper and EDTA respectively, prepare Cu-EDTA waste water with tap water, molar ratio is Cu 2+ :EDTA=1:2,Cu 2+ The concentration is 0.5mmol / L.

[0042] Step 1. Adjust the pH of Cu-EDTA wastewater to 4.5 and then add it to the ozone contact tank. The temperature in the tank is 25°C. Continuously feed ozone through the micropores at the bottom of the ozone contact tank. The dosage is 30mg / (L(aq) .min), micropore diameter ≤ 15μm, auxiliary hydraulic circulation stirring to ensure uniform reaction, reaction 40min, the reaction steps are:

[0043] o 3 +Cu(Ⅱ)-EDTA 2- →Cu(Ⅱ)-EDTAradical+O 3 · -

[0044] HO·+Cu(Ⅱ)-EDTA 2- →Cu(Ⅱ)-EDTAradical+OH-

[0045] Cu(Ⅱ)-EDTAradical→Cu(Ⅲ)-EDTA -

[0046] Cu(Ⅲ)-EDTA - →Cu(Ⅱ)-Yradical+products

[0047] Cu(Ⅱ)-Yradical→Cu(Ⅰ)-Yradical+products

[0048] Cu(Ⅰ)-Yra...

Embodiment 2

[0057] The self-strengthening ozone decomplexing and synchronously removing heavy metal method of the present embodiment, its specific steps are the same as embodiment 1, the difference is: the molar ratio is Cu 2+ :EDTA=1:1, adjust the pH to 3.1, react for 30 minutes, the dosage of ozone is 20mg / (L(aq)·min), and the temperature of step 1 and step 2 is 35°C.

[0058] In this example, Cu-EDTA was completely degraded within 10 minutes, and after 30 minutes of reaction, the removal rate of TOC was about 70%, and the heavy metal Cu 2+ The removal rate is about 99%.

Embodiment 3

[0060] The self-strengthening ozone decomplexation and the method for synchronously removing heavy metals of the present embodiment, heavy metal A and complexing agent B are Ni and EDTA respectively, prepare Ni-EDTA waste water with tap water, molar ratio is Ni 2+ :EDTA=10:1,Ni 2+ The concentration is 0.75mmol / L.

[0061] The specific steps are the same as in Example 1, except that the pH is adjusted to 3.0; the reaction time is 10 minutes, the ozone dosage is 120 mg / (L(aq)·min), and the reaction temperature is 40°C.

[0062] In this example, Ni-EDTA was completely degraded within 5 minutes, and after 10 minutes of reaction, the removal rate of TOC was about 80%, and the heavy metal Ni 2+ The removal rate is about 99%.

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Abstract

The invention discloses a method for synchronous complex breaking and heavy metal removal based on self-strengthening ozone and belongs to the technical field of wastewater treatment. The method for synchronous complex breaking and heavy metal removal based on self-strengthening ozone includes the steps that firstly, pH-adjusted heavy metal complex wastewater containing heavy metal A and a complexing agent B is added to an ozone contact pool, ozone is continuously introduced through micro-pores in the bottom of the ozone contact pool, hydraulic cycle stirring is adopted for assistance, and it is guaranteed that the reaction is uniform; secondly, after the ozone oxidation reaction is completed, a micro-pore filter membrane device is used for filtering for solid-liquid separation, and synchronous complex breaking and heavy metal removal are achieved. The method can be economical, efficient and easy and convenient to operate, engineering application is easy to achieve, complex breaking and metal ion removal are synchronously carried out, and heavy metal complex in the wastewater is removed based on self-strengthening ozone oxidation.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a method for self-strengthening ozone decomplexation and synchronous removal of heavy metals. Background technique [0002] Heavy metal wastewater is one of the most harmful industrial wastewater to human health and the ecological environment. It mainly comes from electroplating, circuit boards, surface treatment, tanning, printing and dyeing, papermaking, chemical industry, machinery manufacturing and other industries. Due to the widespread use of complexing agents such as citric acid, tartaric acid, sodium alginate, EDTA, NTA, DTPA, EDDS, PDTA, etc. in the production processes of these industries, a large amount of heavy metals in wastewater form stable complexes with complexing agents . Compared with free heavy metals, complexed heavy metals are surrounded by multiple O or N coordination atoms to form mononuclear or multinuclear multidentate chelates ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
CPCC02F1/444C02F1/78
Inventor 潘丙才黄先锋许友李旭春张炜铭张淑娟吕路
Owner NANJING UNIV
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