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Method for controlling disinfection by-products of drinking water from surface water

A technology for disinfection by-products and surface water, applied in the direction of water pollutants, water/sewage treatment, chemical instruments and methods, etc., can solve the problem of not being able to intercept microorganisms and other fine particles, not being able to remove dissolved organic matter in water, and removing dissolved organic matter Low efficiency and other problems, to achieve the effect of improving the pre-oxidation effect and coagulation efficiency, low cost, and preventing aluminum from exceeding the standard

Active Publication Date: 2020-01-17
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The removal efficiency of dissolved organic matter by coagulation and sedimentation alone is low. If the dosage of coagulant is continuously increased, it may also lead to muddy water and increase the risk of excessive aluminum content in the effluent. Therefore, blindly increasing the amount of coagulant The dosage of coagulant can not play a better role in the removal of dissolved organic matter in water
Sand filtration uses filter media such as quartz sand or manganese sand to remove particulate matter and suspended solids in water, but the sand filtration process has a poor removal effect on dissolved organic matter, and the sand-filtered water cannot retain microorganisms and other fine particles in the water
Therefore, the conventional process can remove part of the precursors of disinfection by-products, but its removal efficiency for dissolved organic matter is low, and dissolved organic matter is the main precursor of disinfection by-products

Method used

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  • Method for controlling disinfection by-products of drinking water from surface water
  • Method for controlling disinfection by-products of drinking water from surface water
  • Method for controlling disinfection by-products of drinking water from surface water

Examples

Experimental program
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Effect test

Embodiment 1

[0031]Take 1000mL surface water (see Table 1 for the basic physical and chemical properties), first add 0.05mg / L potassium permanganate to the water, stir at a speed of 300r / min for 5min, and then add 0.05mg / L potassium permanganate to the water , stirred at a speed of 150r / min for 10min; added 10mg / L of PACl to the pre-oxidized water, stirred at a speed of 200r / min for 5min, then added PACl 10mg / L, and stirred at a speed of 100r / min for 10min; Set aside to settle for 30 minutes; take the supernatant for ceramic membrane filtration (ceramic membrane pore size 0.1 μm); perform chlorine disinfection on ceramic membrane effluent (chlorine addition 30mg / L, temperature 25±0.5°C, pH 7.0±0.1, avoid light reaction 24h); after disinfection for 24h, add excessive ascorbic acid to terminate the chlorine disinfection reaction, and measure the concentration of disinfection by-products in the water, the results are shown in Table 2.

[0032] Table 1 Basic physical and chemical properties of...

Embodiment 2

[0035] With reference to Example 1, the amount of potassium permanganate added twice is replaced by 0.2mg / L, and other conditions are constant, specifically:

[0036] Take 1000mL surface water, first add 0.1mg / L potassium permanganate to the water, stir at a speed of 300r / min for 5min, then add 0.1mg / L potassium permanganate to the water, stir at a speed of 150r / min 10min; add 10mg / L PACl to the pre-oxidized water, stir at a speed of 200r / min for 5min, then add 10mg / L of PACl, stir at a speed of 100r / min for 10min; let it settle for 30min; take the supernatant Filter the liquid through ceramic membrane (pore size of ceramic membrane is 0.1μm); perform chlorine disinfection on ceramic membrane effluent (chlorination amount 30mg / L, temperature 25±0.5°C, pH 7.0±0.1, light-shielding reaction for 24h); after disinfection for 24h, add Excessive ascorbic acid terminated the chlorine disinfection reaction, and the concentration of disinfection by-products in water was measured. The re...

Embodiment 3

[0038] With reference to Example 1, the amount of potassium permanganate added twice is replaced by 0.5mg / L, and other conditions are constant, specifically:

[0039] Take 1000mL surface water, first add 0.25mg / L potassium permanganate to the water, stir at a speed of 300r / min for 5min, then add 0.25mg / L potassium permanganate to the water, stir at a speed of 150r / min 10min; add 10mg / L PACl to the pre-oxidized water, stir at a speed of 200r / min for 5min, then add 10mg / L of PACl, stir at a speed of 100r / min for 10min; let it settle for 30min; take the supernatant Filter the liquid through ceramic membrane (pore size of ceramic membrane is 0.1μm); perform chlorine disinfection on ceramic membrane effluent (chlorination amount 30mg / L, temperature 25±0.5°C, pH 7.0±0.1, light-shielding reaction for 24h); after disinfection for 24h, add Excessive ascorbic acid terminated the chlorine disinfection reaction, and the concentration of disinfection by-products in water was measured. The ...

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Abstract

The invention discloses a method for controlling disinfection by-products of drinking water from surface water, specifically discloses a method for controlling disinfection by-products through potassium permanganate pre-oxidation, coagulation precipitation and ceramic membrane filtration, and belongs to the technical field of environmental engineering drinking water treatment. Compared with a traditional water treatment method (coagulation, precipitation and sand filtration), the method provided by the invention uses the technical solution of adding a potassium permanganate pre-oxidation process before the coagulation precipitation, and can improve the removal efficiency of organic matter in the water in the coagulation process by the combination of addition in stages and addition of a coagulant in stages; and the ceramic membrane filtration instead of a traditional sand filtration process is adopted after the coagulation precipitation, so that dissolved organic matter in the water canbe removed more efficiently, and the combination of the processes is beneficial to controlling production of the halogenated disinfection by-products in the water.

Description

technical field [0001] The invention relates to a method for controlling disinfection by-products of drinking water in surface water, a method for controlling disinfection by-products through potassium permanganate pre-oxidation-coagulation precipitation-ceramic membrane filtration, belonging to the technical field of environmental engineering drinking water treatment . Background technique [0002] With the continuous development of social economy, surface water has been polluted to varying degrees. Therefore, in the disinfection process of water treatment plants, organic matter in the water body will react with disinfectants to generate a large number of disinfection by-products, which are harmful to the human body. There are carcinogenic, teratogenic and mutagenic effects. Therefore, research on the control of disinfection by-products is particularly important. Trihalomethanes (THMs), as the earliest discovered carbon-containing disinfectants, have received widespread a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/36C02F101/38C02F101/30
CPCC02F1/44C02F1/50C02F1/5236C02F1/72C02F9/00C02F2001/007C02F2101/30C02F2101/36C02F2101/38
Inventor 缪恒锋张晓夏刘宝明王夕希阮文权
Owner JIANGNAN UNIV
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