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Method for removing disinfection by-products in water

A technology for disinfection by-products and water removal, applied in the field of water treatment, can solve the problems of restricting the application of ultraviolet disinfection methods, high toxicity, instability, etc., and achieve the effects of improving anti-microbial pollution performance, prolonging service life, and low system operating costs

Inactive Publication Date: 2016-08-17
GUANGZHOU INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the disinfectants and methods that replace chlorination disinfection mainly include chloramine, ozone and ultraviolet light, etc.: studies have found that reducing the ratio of chlorine to ammonia nitrogen to 5 can reduce the DBPs generated by chlorine disinfection alone by 89%; The amination process not only achieves some of the efficacy of pre-oxidation processes, but also prolongs the contact time of chloramine disinfection and improves the microbial safety of drinking water, but Plewa J, a genetic toxicologist in the Department of Food Science at the University of Illinois Michael's research found that a chloramine disinfection by-product is the most toxic found so far; as a strong oxidant, ozone's bactericidal and oxidizing capabilities are higher than chlorine, and it is the most effective disinfectant in the current dosing disinfection method. Its advantages It does not produce disinfection by-products such as THMs, but the instability of ozone in water makes it difficult to use it as a disinfectant alone for disinfection of drinking water, and ozone disinfection may produce by-products such as bromate; ultraviolet rays The broad-spectrum of sterilization is the highest among all disinfection technologies at present. It can effectively kill a variety of parasites that cannot be killed by chlorine and ozone, such as recessive cysts and Giardia, and there is no DBPs However, the penetration ability of ultraviolet rays in water and the power and life of ultraviolet lamps restrict the application of ultraviolet disinfection methods in drinking water disinfection.

Method used

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  • Method for removing disinfection by-products in water

Examples

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Comparison scheme
Effect test

Embodiment 1

[0048] The present embodiment is a method for removing disinfection by-products in water. The equipment and process used are as shown in Figure 1. The water sample to be treated is swimming pool water after disinfection in a certain swimming pool, wherein the types of DBPs are THMs and HAAs (haloacetic acids). Mainly, THMs and HAAs fluctuate between 230μg / L-260μg / L and 140μg / L-420μg / L respectively. The method includes the following steps:

[0049] (1) Enhanced coagulation:

[0050] Adding water to polyferric sulfate with an iron content of 25wt% makes it a coagulant with a concentration of 5 mg / L;

[0051] Add water to cationic polyacrylamide with a molecular weight of 3000kDa to prepare a coagulant aid with a concentration of 20mg / L;

[0052] Put the coagulant and coagulant aid into the water sample to be treated, the dosage is 50mg / L and 0.15mg / L in turn, adjust the pH value to 8 and then stir, the stirring speed is 400r / min, the stirring time for 15 minutes, then let stan...

Embodiment 2

[0065] This embodiment is a method for removing disinfection byproducts in water. The water sample to be treated is tap water in a certain city as an example. THMs and HAAs fluctuate between 10 μg / L-35 μg / L and 1.4 μg / L-4.5 μg / L respectively. Method steps are similar to embodiment 1, difference is:

[0066] (1) Enhanced coagulation:

[0067] Adding water to polyferric sulfate with an iron content of 15wt% makes it a coagulant with a concentration of 15mg / L;

[0068] Add water to cationic polyacrylamide with a molecular weight of 3000kDa to prepare a coagulant aid with a concentration of 23mg / L;

[0069] Put the coagulant and coagulant aid into the water sample to be treated, the dosage is 40mg / L and 0.10mg / L in turn, adjust the pH value to 7.5 and then stir, the stirring speed is 60r / min, the stirring time for 15 minutes, then stand still for 15 minutes;

[0070] (2) Ultrafiltration:

[0071] The ultrafiltration membrane module 2 comprises an ultrafiltration membrane, and ...

Embodiment 3

[0079] This embodiment is a method for removing disinfection byproducts in water. The water sample to be treated is tap water in a certain city as an example. THMs and HAAs fluctuate between 10 μg / L-35 μg / L and 1.4 μg / L-4.5 μg / L respectively. Method steps are similar to embodiment 1, difference is:

[0080] (1) Enhanced coagulation:

[0081] Adding water to polyferric sulfate with an iron content of 20wt% makes it a coagulant with a concentration of 15 mg / L;

[0082] Add water to cationic polyacrylamide with a molecular weight of 3000kDa to prepare a coagulant aid with a concentration of 24mg / L;

[0083] Put the coagulant and coagulant into the water sample to be treated, the dosage is 45mg / L and 0.096mg / L in turn, adjust the pH value to 6.41 and then stir, the stirring speed is 200r / min, the stirring time for 20min, then stand still for 20min;

[0084] (2) Ultrafiltration:

[0085] The ultrafiltration membrane module 2 comprises an ultrafiltration membrane, and the ultraf...

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Abstract

The invention relates to a method for removing disinfection by-products in water. The method is characterized by carrying out integrated membrane treatment after enhanced coagulation of a water sample to be treated, wherein the integrated membrane treatment method comprises the following steps: ultrafiltration: purifying the water sample subjected to enhanced coagulation by adopting an ultrafiltration membrane to obtain a first water sample; nanofiltration: purifying the first water sample by adopting a nanofiltration membrane to obtain a second water sample; pervaporation: purifying the second water sample by adopting a pervaporation membrane and then collecting the second water sample, thus removing the disinfection by-products in water. The method has the beneficial effects that the enhanced coagulation technology and the three-stage integrated membrane technology comprising ultrafiltration, nanofiltration and pervaporation are integrated to remove the disinfection by-products in water; through organic combination of the steps, the removal rate of the disinfection by-products is more than or equal to 90%, the disinfection by-products in water are effectively reduced and the water quality requirement of safe water is met; therefore the method has great significance to purifying chlorinated swimming pool water, drinking water, and the like.

Description

technical field [0001] The invention relates to water treatment, in particular to a method for removing disinfection by-products in water. Background technique [0002] Chlorination disinfection is the most widely used disinfection method in drinking water processing and has a history of hundreds of years. However, the chlorination disinfection method will inevitably produce chlorination disinfection by-products (DBPs). As early as 1974, studies have found that DBPs have strong carcinogenic, teratogenic, and mutagenic effects, which seriously endanger human health. [0003] In order to ensure the safety of human water use, the control of DBPs in water has been highly valued by countries all over the world. At present, the United States reduces the maximum allowable concentration of THMs in drinking water in two stages: in the first stage, THMs are reduced from 100 μg / L to 80 μg / L; in the second stage, THMs are further reduced to 40 μg / L. my country has also made strict re...

Claims

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Application Information

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IPC IPC(8): C02F9/04B01D71/34B01D71/68B01D67/00C02F103/04C02F103/42
CPCB01D67/0006B01D71/34B01D71/68B01D2323/36B01D2325/48C02F1/442C02F1/444C02F1/445C02F1/5245C02F1/56C02F9/00C02F2103/04C02F2103/42C02F2301/08
Inventor 韩健健陈顺权
Owner GUANGZHOU INST OF ADVANCED TECH CHINESE ACAD OF SCI
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