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Method for removing organic micro-pollutants from drinking water by using persulfate reinforced iron salt coagulation process

A persulfate and pollutant technology, applied in the field of water treatment, can solve the problems of secondary pollution, high toxicity, slow conversion rate, etc., achieve the best removal effect, good effluent quality, and low treatment cost

Active Publication Date: 2019-12-13
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conversion rate of oxidized Fe(III) to Fe(II) in this system is very slow, resulting in low degradation efficiency of organic pollutants
Existing research often promotes the Fe(III) / Fe(II) cycle by adding ultraviolet rays, accelerators, etc., which not only increases the processing cost and operational difficulty, but may even cause secondary pollution problems
The inventor's research group discloses a method of using plant polyphenols to promote Fe(III) activated persulfate to repair organic wastewater in Chinese patent literature (publication number is CN 108946907 A). Although the accelerator plant polyphenols used has no However, whether it is converted into toxic by-products in the reaction process needs to be further studied; in addition, because it is difficult to achieve complete mineralization in the oxidation process, the newly formed oxidation products may be further affected by chlorine disinfection in the drinking water treatment process. Generate more toxic disinfection by-products
Therefore, this method is not suitable for the treatment of organic micropollutants in drinking water

Method used

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  • Method for removing organic micro-pollutants from drinking water by using persulfate reinforced iron salt coagulation process
  • Method for removing organic micro-pollutants from drinking water by using persulfate reinforced iron salt coagulation process
  • Method for removing organic micro-pollutants from drinking water by using persulfate reinforced iron salt coagulation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1 Using Suwannee River Fulvic Acid to Synergize with Ferric Chloride to Activate Sodium Peroxodisulfate to Degrade Carbamazepine

[0042] 1. Utilize Suwannee River Fulvic Acid (SRFA) (organic matter in water, purchased from the International Humic Acid Association) to activate ferric chloride to activate sodium peroxodisulfate to degrade carbamazepine, including the following steps:

[0043] Treatment group 1: Prepare 150 mL of carbamazepine aqueous solution with a concentration of 1 μM, add 2 mg / L SRFA (as a model fulvic acid, purchased from the International Humic Acid Association), 0.02 mM FeCl 3 and 0.2mM sodium peroxodisulfate, the above solution was stirred and reacted at 30rpm. The concentration change of carbamazepine was determined during the reaction.

[0044] Treatment group 2: The concentration of SRFA added was 10 mg / L, and other experimental conditions were the same as treatment group 1.

[0045] Control group: no SRFA was added, and other experi...

Embodiment 2

[0048] Example 2 Degradation of Bisphenol A by Activation of Potassium Monopersulfate with Humic Acid and Ferric Sulfate

[0049] 1. A method for degrading bisphenol-A by using humic acid in conjunction with ferric sulfate to activate potassium hydrogen persulfate to degrade bisphenol A, comprising the steps:

[0050] Prepare 500 mL of bisphenol A solution with a concentration of 0.4 μM, add 8 mg / L humic acid (purchased from sigma), and mix evenly by hand; prepare a certain concentration of ferric sulfate solution and potassium monopersulfate solution, and mix the two in advance Then it is added into the aqueous solution containing bisphenol A, so that the concentrations of iron ions and potassium monopersulfate in the reaction system are respectively 0.2 and 0.3 mM. The above solutions were mixed evenly, and placed in a shaker for 30 minutes of shaking reaction, and the change of the concentration of bisphenol A was measured during the reaction.

[0051] 2. Experimental resu...

Embodiment 3

[0053] Example 3 Potassium monopersulfate strengthens iron salt coagulation process to remove carbamazepine in natural water bodies

[0054] 1. Utilize potassium hydrogen persulfate to strengthen iron-salt coagulation process to remove carbamazepine in natural water bodies, including the following steps:

[0055] Add 800mL of natural water (dissolved organic matter = 1.7mg / L, pH = 7.5, turbidity = 14.7NTU) into two 1L coagulation buckets, add a small amount of carbamazepine solution to make the concentration 1μM; Add 0.2mM ferric chloride or ferric sulfate, and add 1mM potassium hydrogen persulfate at the same time, stir at 200rpm for 1min, stir at 30rpm for 30min, and let it stand for 30min to precipitate for a reaction. The concentration of carbamazepine in water was determined at different reaction times. And after the reaction, the pH value, turbidity and iron ion concentration of the water body were measured.

[0056] 2. Experimental results

[0057] as attached imag...

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Abstract

The invention discloses a method for removing organic micro-pollutants from drinking water by using a persulfate reinforced iron salt coagulation process, wherein the method comprises providing to-be-treated water, coagulating, treating in a precipitation pool, treating in a filtering pool, sterilizing, conveying into a clear water pool, and conveying to users, wherein an iron salt coagulant and apersulfate solution are simultaneously added to perform coagulating, and the to-be-treated water is the influent of tap water plants and sewage treatment plant or industrial wastewater treatment effluent. According to the present invention, the method solves the problem that the traditional drinking water treatment process cannot effectively remove organic micro-pollutants; compared with the existing system for degrading organic pollutants with persulfate, the method of the present invention has advantages of no requirement of additional energy sources, activating agents or accelerants, simple operation, no requirement of additional equipment, low treatment cost, no secondary pollution and the like; after municipal sewage or industrial wastewater is subjected to conventional treatment, deep treatment can be performed by using the method of the present invention; and the method has characteristics of good effluent quality, safety and reliability.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for removing organic micro-pollutants in drinking water by using a persulfate-enhanced iron salt coagulation process. This method is mainly aimed at the treatment of trace organic pollutants in drinking water source water; in addition, this method can also be used for advanced treatment of urban sewage and industrial wastewater (with low impurities in water) that have been treated by conventional water treatment processes. Background technique [0002] Water is an important medium for spreading diseases, and clean drinking water is a fundamental need for human survival. With the increasing scarcity of global fresh water resources and the aggravation of environmental problems, the water quality safety of drinking water has been increasingly concerned by the society. According to the statistics of the World Health Organization, it is found that drinkin...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/30
CPCC02F1/001C02F1/50C02F1/5236C02F1/72C02F9/00C02F2001/007C02F2101/30C02F2303/04
Inventor 杨欣王玉潘涛
Owner SUN YAT SEN UNIV
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