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Talking about the application of ultrafiltration membrane technology in environmental engineering water treatment

编辑: 毕业论文 Release time: 2016-08-29 Editor: Graduation Thesis

Abstract: This article first discusses the basic principles and characteristics of ultrafiltration membrane technology, and then discusses the application of ultrafiltration membrane technology in water treatment from 5 aspects for reference.

Paper Keywords: Application of Ultrafiltration Membrane Technology in Environmental Engineering Water Treatment

1 Introduction

Ultrafiltration membrane technology is a membrane permeation separation technology capable of purifying, separating or concentrating a solution, between microfiltration and nanofiltration. The ultrafiltration membrane is an effective barrier for suspended particles and colloidal materials. At the same time, the ultrafiltration membrane can also effectively remove "two insects, algae, bacteria, viruses and aquatic organisms, so as to achieve the purpose of purification, separation and concentration of solutions. And Compared with traditional processes, ultrafiltration membrane technology has the advantages of low energy consumption, low operating pressure, high separation efficiency, large flux and recyclable useful substances in water treatment. , Pulp wastewater, seawater desalination and other water treatment. Here, this article briefly describes the application of ultrafiltration membrane technology in environmental engineering water treatment for reference.

2 Basic principles and characteristics of ultrafiltration membrane technology

2.1 Basic principles of ultrafiltration membrane technology

Ultra Filtration (UF) refers to the solution under pressure, the solvent and some low molecular weight solutes pass through the micropores on the membrane to reach the other side of the membrane, while high molecular solutes or other emulsified micelles are trapped to achieve The purpose of separation in solution. The retention mechanism is mainly sieving, but sometimes the chemical characteristics of the surface of the membrane (the electrostatic effect of the membrane) also play a role in retention. In ultrafiltration separation, after a certain pressure is applied to the feed liquid, the polymer material and colloidal material are blocked by the membrane surface and micropores due to one-time adsorption, and are trapped in the pores. Ultrafiltration membranes prevent water, inorganic salts and low molecular substances from passing through the membrane.

The definition of the molecular weight cut-off of ultrafiltration membrane technology is about 500-500000, the corresponding pore size is about 0.002-0.1μm, the operating static pressure difference is generally 0.1-0.5MPa, and the diameter of the separated components is about 0.005-10μm.

2.2 Characteristics of ultrafiltration membrane technology

1. The removal efficiency of impurities is high, and the quality of produced water is much better than the traditional method.

2. Eliminate or greatly reduce the use of chemicals to avoid secondary pollution.

3. The system is easy to automate and has high reliability. The operation is simple, the facility can only be opened and closed in two gears.

4. Has good chemical stability, resistance to acid, alkali and hydrolysis, and can be widely used in various fields.

5. The heat-resistant temperature can reach 140 ° C, and it can be sterilized with steam and ethylene oxide at an extremely high temperature; it can be used in a wide range of pH, and can be used under the conditions of strong acids and alkalis and various organic solvents.

6. High filtration precision, can effectively remove 99.99% of colloids, bacteria, suspended matter and other harmful substances in water.

7. The cost is equivalent to that of conventional water treatment systems. Domestic sewage can be reused by ultrafiltration to improve the quality of the treated water, while industrial wastewater cannot meet the standard due to general technology. Ultrafiltration technology can fully treat wastewater.

3 Application of ultrafiltration membrane technology in water treatment

3.1 Drinking water purification

At present, with the increasingly serious problem of water pollution in China, new water quality problems have emerged in our country, such as Giardia and Cryptosporidium (two insects), Daphnia and red insect problems, aggravated algae pollution and odors and algal toxins Problems, biological stability of water, etc. When the ultrafiltration membrane technology is applied to the purification of drinking water, it can remove microorganisms including daphnia, algae, protozoa, bacteria and even viruses in water, and pathogenic microorganisms, turbidity, natural organic matter, and trace organic matter in water. Pollutants, ammonia nitrogen, etc. all have better treatment effects, which can meet people's requirements for water quality.

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