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Method for quickly removing organic pollutants in water based on intermediate-state iron

A technology for removing organic pollutants and water. It is used in neutralizing water/sewage treatment, water/sewage treatment, chemical instruments and methods, etc. It can solve the problem of low secondary reaction rate, no degradation of pollutants, and reduced oxidation efficiency. problem, to achieve high oxidation efficiency, low price, and enhanced removal effect

Active Publication Date: 2016-05-25
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The secondary reaction rate of traditional oxidation technology with most organic pollutants is relatively small, and some difficult-to-oxidize organic pollutants cannot be oxidized
Common hydroxyl radical-based advanced oxidation techniques include O 3 / H 2 o 2 ,Fe 2+ / H 2 o 2 ,UV / O 3 ,UV / O 3 / H 2 o 2 ,UV / H 2 o 2 etc., the OH produced by these technologies has a very high oxidation capacity, its redox potential is 2.70-2.80V, and the secondary reaction rate constant with most organic micropollutants is as high as 10 8 -10 10 m -1 the s -1 , but the steady-state concentration of OH is generally as low as 10 -14 -10 -16 moL -1 , so the superficial rate of the reaction between OH and organic micropollutants is not high, and OH has no selectivity when oxidizing pollutants. In addition to reacting with target pollutants in water, it will also be affected by humic acid, carbonate and Consumed by substances such as bicarbonate, so its oxidation efficiency is greatly reduced
Common based on SO 4 ·- The advanced oxidation technology mainly refers to the generation of SO by activating persulfate or persulfate through energy (heating, ultraviolet radiation, radiolysis, etc.) and heavy metals. 4 ·- , the activated SO 4 ·- It is a strong oxidizing agent with an oxidation-reduction potential of 2.6V, but as SO 4 ·- The technology as an active oxidant has a slow oxidation rate for pollutants and has no degradation effect on some pollutants. At the same time, it is easy to generate strong carcinogen bromate when treating water samples containing bromide ions
Since every oxidation technology currently in use has certain limitations, there is an urgent need to develop new oxidation technologies

Method used

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  • Method for quickly removing organic pollutants in water based on intermediate-state iron
  • Method for quickly removing organic pollutants in water based on intermediate-state iron
  • Method for quickly removing organic pollutants in water based on intermediate-state iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Present embodiment is carried out in jet mixer, and concrete steps are as follows:

[0039] Adjust the pH of pharmaceutical wastewater containing 5 μM carbamazepine to 8.0, and add 50 μM potassium ferrate and 500 μM sodium metabisulfite at the same time (the molar ratio of sulfite to potassium ferrate is 10), and 80% of the carbamazepine can be oxidized in just 30 seconds Ma Xiping.

[0040] Further move the water sample to the coagulation equipment: stir rapidly for 0.5 min at a stirring speed of 100 rpm, stir slowly for 15 min at a stirring speed of 40 rpm, and the removal rate of carbamazepine after 20 min of precipitation is 90%.

[0041] When potassium ferrate was used alone, only 2% of carbamazepine was removed in 30 s.

[0042] Compared with adding potassium ferrate alone, the apparent rate constant of carbamazepine oxidation was increased by 33 times after adding sodium metabisulfite.

[0043] For specific oxidation effects, see figure 1 .

Embodiment 2

[0045] This example is different from Example 1 in that it is completed in a swirl mixer. First, 500 μM sodium metabisulfite is added to the pharmaceutical wastewater containing 5 μM carbamazepine to quickly adjust the pH to 8.0, and then 50 μM potassium ferrate is added.

Embodiment 3

[0047] Adjust the pH of pharmaceutical wastewater containing 5 μM carbamazepine to 7.0, and at the same time add 50 μM potassium ferrate and 250 μM sodium metabisulfite (the molar ratio of sulfite to potassium ferrate is 5), and 74% of the carbamazepine can be removed in 30 seconds. Ma Xiping.

[0048] The water sample was further moved to the coagulation equipment: rapid stirring for 1.0 min at a stirring speed of 200 rpm, slow stirring for 15 min at a stirring speed of 40 rpm, and the removal rate of carbamazepine after 25 min of precipitation was 83%.

[0049] After further adding polyaluminum chloride coagulant, stir rapidly for 1.0min at a stirring speed of 200rpm, stir slowly for 15min at a stirring speed of 40rpm, and the removal rate of carbamazepine after precipitation for 25min is 91%.

[0050] When potassium ferrate was used alone, only 3% of carbamazepine was removed in 30 s.

[0051] Compared with potassium ferrate alone, the apparent rate constant for carbamazep...

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Abstract

The invention discloses a method for quickly removing organic pollutants in water by utilizing pyrosulfite to activate ferrate and relates to a method for utilizing the pyrosulfite to activate the ferrate and produce intermediate-state iron (Fe (V) and Fe (IV)) so as to quickly oxidize and remove the pollutants in water. The method can be used for deep treatment of domestic sewage and can be also used for deep treatment of high-concentration organic wastewater. The method has the following advantages that 1, a green and safe solid agent is adopted, is convenient to transport and low in price, is applied to an existing process and does not need process transformation; 2, the conditions required by reaction are mild and facilitate actual application; 3, reactants are ferric iron and sulfate radicals, wherein the ferric iron has adsorption and coagulation enhancement effects and can promote removal of the pollutants, a coagulant can be subsequently added to further remove organic pollutants in water when needed, and the sulfate radicals are non-toxic and harmless and are background ions in the water; 4, the method has the higher oxidation efficiency, oxidation speed and oxidation capability to the pollutants.

Description

technical field [0001] The invention belongs to the technical field of water and sewage treatment, and relates to a method for rapidly oxidizing and removing organic pollutants in water by using pyrosulfite to activate ferrate to produce intermediate iron (Fe(V) and Fe(IV)). The method can be used not only for advanced treatment of domestic sewage, but also for advanced treatment of high-concentration organic wastewater such as forward osmosis, reverse osmosis concentrate, landfill leachate, and chemical wastewater. Background technique [0002] Emerging pollutants, such as endocrine disruptors, drugs and personal care products, are mostly environmentally persistent, bioaccumulative and highly toxic, have endocrine disrupting effects, cause environmental microbial resistance and produce superbugs and other environmental effects; seriously affect Ecological security, pollute drinking water sources, and migrate through the food chain, threatening food safety and human health. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F9/04
CPCC02F1/5236C02F1/66C02F9/00C02F2301/08C02F2305/02
Inventor 关小红董红钰王辉范文娟乔俊莲
Owner TONGJI UNIV
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