The Application of Ultrafiltration in Water Treatment,BeijingWater treatment equipment,BeijingUltrafiltration equipment,BeijingUltrafiltration membrane

Ultrafiltration is a membrane system between microfiltration and nanofiltration, with an average pore size of3-100nmUltrafiltration membranes are a type of membrane separation technology capable of purifying, separating and concentrating solutions. Their retention mechanism mainly relies on sieving. However, sometimes the membrane pores are larger than both the solvent molecules and the solute molecules, and the chemical properties of the membrane surface also play a retention role. Driven by the pressure difference on both sides of the membrane and using ultrafiltration membranes as the filtration medium, under certain pressure, When water flows over the membrane surface, only water and low-molecular-weight solutes are allowed to pass through, thereby achieving the purpose of purifying, separating and concentrating the solution.

The application of ultrafiltration in water treatment for drinking water

Ultrafiltration can generally remove microorganisms from water, including water fleas, algae, protozoa, and even viruses. When combined with proxy treatment processes, it can fully leverage the advantages of each process and has a good removal effect on pathogenic microorganisms, turbidity, natural organic matter, trace organic pollutants, ammonia nitrogen, etc. in water, thereby meeting people's increasingly high requirements for water quality.

Wastewater treatment

Due to the various characteristics of ultrafiltration membranes, they are widely used in both domestic sewage and industrial wastewater. Domestic sewage can be treated to improve water quality and reused after ultrafiltration, while for industrial wastewater, since general technology cannot meet the standards, ultrafiltration technology can fully treat the wastewater.

Domestic sewage treatment

The wastewater from urban sewage treatment plants can be treated by ultrafiltration membrane technology. The treated water quality is good and can be used for reclaimed water reuse. Moreover, the reactor occupies a small area and the equipment investment is low, making it widely applicable for reclaimed water reuse in residential areas.

Oily wastewater treatment

There are three states in which oily wastewater exists: Floating oil, dispersed oil and emulsified oil are two types that are relatively easy to handle. Mechanical separation, flocculation sedimentation, activated carbon adsorption and other treatments can be adopted to reduce the content to a very low level. However, emulsified oil contains surfactants and organic substances with the same effect as gas. The oil content exists in water in the form of micron-sized ions. Gravity separation and coarsening methods are both relatively difficult. Ultrafiltration membranes can achieve this goal. He enables water and low-molecular-weight organic substances to pass through the membrane, thereby achieving oil-water separation. For instance, the oil content in oilfield wastewater is typically as high as100-1000mg/lTherefore, before discharge, oil removal treatment is carried out by applying hollow fiber ultrafiltration membrane technology to ensure that the treated wastewater meets the requirements

100mg/l.

Industrial wastewater treatment

Wastewater formed during the processing of milk, beverages, starch, yeast, tofu, meat, etc. in industry contains a large amount of protein, starch, yeast, lactose and fat, etc., all of which have certain recycling value. And in this type of wastewaterBOD,CODUltrafiltration can cause pollution to the environment and is difficult to treat by general biochemical methods. Moreover, it is impossible to recover the useful substances in it. Ultrafiltration can achieve utilization and purify wastewater at the same time.

Electroplating wastewater treatment

The water consumption of electroplating wastewater is high. The heavy metal ions such as cyanide, hexavalent chromium, nickel, copper, zinc and iron in it are highly toxic and can cause serious impacts on people, crops and crops. The characteristic of electroplating wastewater is its low biodegradability, and the metal ions within it are difficult for microorganisms to absorb. The combined use of ultrafiltration membranes and reverse osmosis can respectively enhance the conductivity, nickel, nitrate and total organic carbon in nickel plating wastewater97%,99.8%,95%and87%By using ultrafiltration membranes as pretreatment, the contamination of reverse osmosis membranes is significantly reduced, and the flux of reverse osmosis membranes can be increased

30-50%.

The treatment of papermaking wastewater

Ultrafiltration is applied in papermaking wastewater mainly to concentrate and recover certain components. The water that passes through is then returned to the process for reuse. The main substance recovered is sulfonated lignin, which can be reused in the pulp. This can create significant environmental and economic benefits.

Desalination of seawater

Research on small-scale desalination devices has clearly demonstrated that ultrafiltration systems can effectively control seawater quality and provide high-quality feed water for reverse osmosis systems. Long-term experiments have shown that the effluent from ultrafiltration systemsSDIThe value can be very well unloaded2Below, these tests do not require any pretreatment before the ultrafiltration system and are applicable to various seawater qualities.

The role of ultrafiltration special agents in the system

Since the material separation function of the ultrafiltration system is achieved through membranes, like other membrane separation equipment, it will always experience membrane fouling and a decrease in flux during use. The main cause of membrane fouling is biological fouling. The flux decline caused by membrane fouling is irreversible and severe enough to make the process difficult to proceed. This leads to a series of adverse consequences such as a decrease in the desalination efficiency of the device and a shortened service life.Beijing YuanlaiWater treatment equipment,BeijingUltrafiltration equipment,BeijingUltrafiltration membrane