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Method for removing natural organism and heavy metal simultaneously from water

A technology of natural organic matter and heavy metals, applied in the field of water treatment, can solve the problems that do not involve removal, and achieve the effect of reducing the number of cleanings, reducing process costs, and reducing membrane pollution

Inactive Publication Date: 2009-10-14
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no description of charged ultrafiltration membrane technology in these new methods, and it does not involve the removal of natural organic matter in water while removing heavy metals

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Step 1, using simple humic acid solids extracted from nature to prepare water samples to be treated, the concentration of humic acid solution is 20mg / L, heavy metal ions Pb 2+ The concentration is 10mg / L, and the pH is adjusted to 6.0; a flat regenerated cellulose membrane with a molecular weight cut-off of 100kD is selected, and its Zeta potential is -0.8mv. Modified by chemical method, after immersing the membrane in sulfonic acid modifier for 48 hours, a negatively charged modified regenerated cellulose ultrafiltration membrane was obtained, and its Zeta potential was -11.3mv;

[0016] Step 2, placing the negatively charged modified regenerated cellulose membrane on an ultrafiltration device, and filtering the water sample to be treated under a pressure of 69 kPa for 4 hours. After 4 hours of ultrafiltration, the membrane flux on the unmodified regenerated cellulose membrane decreased by 66% compared with the initial ultrafiltration flux, and the NOM and Pb 2+ The r...

Embodiment 2

[0018] Step 1, using simple humic acid solids extracted from nature to prepare water samples to be treated, the concentration of humic acid solution is 20mg / L, and the heavy metal ion Ni 2+ The concentration is 10mg / L, and the pH is adjusted to 6.0; a flat regenerated cellulose membrane with a molecular weight cut-off of 100kD is selected, and its Zeta potential is -0.8mv. Modified by chemical method, after immersing the membrane in sulfonic acid modifier for 48 hours, a negatively charged modified regenerated cellulose ultrafiltration membrane was obtained, and its Zeta potential was -11.3mv;

[0019] Step 2, placing the negatively charged modified regenerated cellulose membrane on an ultrafiltration device, and filtering the water sample to be treated under a pressure of 69 kPa for 4 hours. After 4 hours of ultrafiltration, the membrane flux on the unmodified regenerated cellulose membrane decreased by 63% compared with the initial ultrafiltration flux, and the NOM and Ni 2...

Embodiment 3

[0021] Step 1, using simple humic acid solids extracted from nature to prepare water samples to be treated, the concentration of humic acid solution is 20mg / L, heavy metal ions Pb 2+ and Ni 2+ The respective concentrations of each are 10mg / L, and the pH is adjusted to 6.0; a flat regenerated cellulose membrane with a molecular weight cut-off of 100kD is selected, and its Zeta potential is -0.8mv. Modified by chemical method, after immersing the membrane in sulfonic acid modifier for 48 hours, a negatively charged modified regenerated cellulose ultrafiltration membrane was obtained, and its Zeta potential was -11.3mv;

[0022] Step 2, placing the negatively charged modified regenerated cellulose membrane on an ultrafiltration device, and filtering the water sample to be treated under a pressure of 69 kPa for 4 hours. After ultrafiltration for 4 hours, the membrane flux on the unmodified regenerated cellulose membrane decreased by 63% compared with the initial ultrafiltration f...

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PUM

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Abstract

The invention relates to a method for removing natural organism and heavy metal simultaneously from water, belonging to the technical field of water treatment. The method comprises the steps as follows: Step One, a hydrophilic ultrafiltration membrane is modified to a hydrophilic charged ultrafiltration membrane, wherein shape of the hydrophilic charged ultrafiltration membrane is one selected from flatbed, roll type, hollow fibre type and tube type; Step Two, the hydrophilic charged ultrafiltration membrane is placed on an ultrafiltration device and dead-end filtration or cross-flow filtration is employed to carry out ultrafiltration to water to be treated which comprises natural organism and heavy metal. The method of the invention is simple in process and free of medicine addition; the method has reliable operation, compact device, and easy automatic control, which can reduce membrane pollution, prolong membrane service life and reduce process cost.

Description

technical field [0001] The invention relates to a treatment method in the technical field of water treatment, in particular to a method for simultaneously removing natural organic matter and heavy metals in water. Background technique [0002] Natural organic matter (NOM) is a macromolecular organic matter produced by the decay and decomposition of animals and plants in the natural cycle. NOM not only causes chromaticity, odor, corrosion of water distribution pipe network and biological instability, but also is an important precursor of chlorinated disinfection by-products (DBPs), which is the main factor leading to the sudden increase of drinking water quality. In addition, NOM can also affect the photodegradation of microcystins, form complexes with heavy metals and pesticides, and increase the persistence and bioaccumulation of these substances. Therefore, the removal of NOM in drinking water has been a hot spot in the water treatment field in recent years, and it is als...

Claims

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Application Information

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IPC IPC(8): C02F1/44C02F1/58C02F1/62
Inventor 邵嘉慧侯娟谢章旺宋宏臣
Owner SHANGHAI JIAO TONG UNIV
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