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Emergency treatment method for sudden heavy metal pollution of drinking water

A technology for emergency treatment and sudden pollution, applied in the field of water treatment, can solve problems such as produced water not meeting drinking water sanitation standards, unsatisfactory treatment effect, and drinking water safety, so as to improve anti-pollution ability, guarantee removal, and slow down pollution effect

Pending Publication Date: 2020-09-11
GUANGDONG GDH WATER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sudden pollution of heavy metal type is the processing blind area of ​​the nanofiltration integrated device. The ultrafiltration pretreatment of nanofiltration has basically no effect on the removal of heavy metals. The nanofiltration device can remove more than 95% of heavy metals, but in the case of severe heavy metal sudden pollution (>10mg / L), the produced water still does not meet the drinking water hygiene standards, and there are potential drinking water safety hazards
In addition, the pollution of heavy metals to nanofiltration membranes is different from various organic substances. The flux of nanofiltration membranes caused by heavy metals decreases, no matter after physical washing or chemical cleaning, more than 80% of the flux cannot be recovered, resulting in nanofiltration devices becoming " Disposable "water treatment device, the cost of treatment increases sharply, and the treatment effect is not ideal

Method used

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  • Emergency treatment method for sudden heavy metal pollution of drinking water
  • Emergency treatment method for sudden heavy metal pollution of drinking water
  • Emergency treatment method for sudden heavy metal pollution of drinking water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The present embodiment is the embodiment of the emergency treatment method for sudden heavy metal pollution in drinking water of the present invention, comprising the following steps:

[0038] S10. Select the type of filter medium, ultrafiltration membrane and nanofiltration membrane, and build emergency treatment including heavy metal adsorption column 3, filter 4, ultrafiltration module 5, first nanofiltration membrane device 8, and second nanofiltration membrane device 9 system;

[0039]S20. Use the first water pump 2 to pump the polluted drinking water in the raw water tank 1 into the heavy metal adsorption column 3 to absorb and remove heavy metals to obtain the first produced water, and the first produced water enters the filter 4 to remove large particle colloids, suspended solids and macromolecules The second produced water is obtained after the organic matter, and the third produced water is obtained after the second produced water is intercepted by the ultrafi...

Embodiment 2

[0059] The present embodiment is the same as the first embodiment, except that in the present embodiment, the critical adsorption capacity of zeolite is 4.608 mg / g, the consumption of zeolite is 47 kg, the hydraulic retention time is 76 s, and the nanofiltration membrane adopts the model NF270-4040 composite membrane, The molecular weight cut off is 270Da, and the experimental results are shown in Table 3.

[0060] Table 3 The removal effect of heavy metal ions in Example 2

[0061]

[0062]As can be seen from the data in Table 3, this embodiment has a remarkable effect on the removal of heavy metal ions, and the removal rate of heavy metal ions reaches 96.74% to 99.76%, especially for copper ions. The removal effect is as high as 99.57%. The heavy metal removal effect is obvious, and the concentration of most heavy metals in the influent can be effectively controlled within 10mg / L, which can effectively guarantee the normal operation of the subsequent double-membrane (ultr...

Embodiment 3

[0064] The present embodiment is the same as the first embodiment, except that in the present embodiment, the critical adsorption capacity of zeolite is 5.332 mg / g, the amount of zeolite is 41 kg, the hydraulic retention time is 65 s, and the nanofiltration membrane adopts a tubular ceramic membrane with a molecular weight cut-off of 600Da, the experimental results are shown in Table 4.

[0065] Table 4 The removal effect of heavy metal ions in Example 3

[0066]

[0067]

[0068] As can be seen from the data in Table 4, this embodiment has a remarkable effect on the removal of heavy metal ions, and the removal rate of heavy metal ions reaches 93.60% to 99.79%, especially for copper ions. The removal effect is as high as 99.91%. The heavy metal removal effect is obvious, and the concentration of heavy metals in the influent can be effectively controlled at 10mg / L, which can effectively guarantee the normal operation of the subsequent double-membrane (ultrafiltration memb...

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Abstract

The invention relates to the technical field of water treatment, in particular to an emergency treatment method for sudden heavy metal pollution of drinking water. The method comprises the following steps of: S10, building an emergency treatment system; S20, enabling polluted drinking water to flow through a heavy metal adsorption column, a filter, an ultrafiltration assembly and a nanofiltrationassembly in sequence for treatment; S30, subjecting first concentrated water generated by a first nanofiltration membrane device to nanofiltration by a second nanofiltration membrane device, and letting second concentrated water generated by the second nanofiltration membrane device flow into a concentrated water tank or flow back to the first nanofiltration membrane device; and S40, pumping produced water in a nanofiltration produced water tank to a user. According to the invention, an adsorption-ultrafiltration-nanofiltration combined mode is adopted, the penetration risk of heavy metals isreduced through adsorption, the normal operation of nanofiltration is guaranteed, the anti-pollution capacity of the nanofiltration membrane is improved through ultrafiltration, the pollutant removalcapacity of ultrafiltration is improved through nanofiltration, the synergistic effect between adsorption, ultrafiltration and nanofiltration is brought into full play, removal of inorganic salt andorganic pollutants is guaranteed, removal of heavy metals is enhanced, and nanofiltration produced water capable of being directly drinkable is obtained.

Description

technical field [0001] The invention relates to the technical field of water treatment, and more specifically, to an emergency treatment method for sudden heavy metal pollution of drinking water. Background technique [0002] In recent years, with the development of society and economy, the degree of industrialization has become higher and higher, the pollution of water resources such as rivers, lakes, and reservoirs has become increasingly serious, and sudden water pollution has occurred frequently, causing serious damage to environmental resources and users' drinking water rights and interests. Water security is difficult to guarantee. Facing the severe situation, it is necessary to be cautious about frequent sudden water pollution accidents and natural disasters, and at the same time, we should pay attention to the research and development of emergency water treatment technology and equipment. When a sudden water pollution accident occurs, it can quickly and effectively ...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/20
CPCC02F9/00C02F2101/20C02F1/001C02F1/444C02F1/442C02F1/28C02F1/281C02F5/08C02F1/72C02F1/52
Inventor 郭卫鹏武睿孙国胜赵焱钟建宇梁恒
Owner GUANGDONG GDH WATER
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