Membrane filtration unit and membrane assembly

Abstract

The invention discloses a membrane filtration unit and a membrane assembly. The membrane filtration unit comprises an upper filtration membrane and a lower filtration membrane, wherein outer side edges of the upper filtration membrane and outer side edges of the lower filtration membrane are combined into closed peripheries; a mounting through hole penetrating through the upper filtration membrane and the lower filtration membrane is formed in the center of the membrane filtration unit; the membrane filtration unit further comprises an upper support net used for supporting the upper filtration membrane and a lower support net used for supporting the lower filtration membrane, the upper support net and the lower support net are arranged between the upper filtration membrane and the lower filtration membrane, and a cavity is formed between the upper support net and the lower support net. Firstly, guide channels can be formed by the support nets in the surfaces of the filtration membranes, can have a guide function and further can prevent adhesion of the upper filtration membrane and the lower filtration membrane to a certain extent; secondly, during larger water flow disturbance, the swinging amplitude of the membrane filtration unit can also be substantially reduced, and adjacent filtration membranes of adjacent membrane filtration units don't easily adhere to each other; moreover, the cavity with a stable size is formed between the upper support net and the lower support net, filtration pressure difference can be remarkably reduced, and the filtration efficiency can be improved.

Description

technical field [0001] The invention relates to the technical field of water treatment equipment, in particular to a membrane filtration unit and a membrane module using the membrane filtration unit. Background technique [0002] Membrane technology, known as the water treatment technology of the 21st century, has developed rapidly in the past 40 years. Compared with traditional water treatment technology, membrane technology has the advantages of energy saving, less investment, easy operation and high treatment efficiency, and its application has brought huge environmental and economic benefits to human beings. Membrane technology has a wide range of applications in water treatment, both for drinking water treatment and wastewater treatment, and also involved in water treatment in some special industries. [0003] In the application process of membrane technology, especially in the application of membrane stacks with stacked membranes, the distance between membranes cannot...

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Problems solved by technology

[0003] In the application process of membrane technology, especially in the application of membrane stacks with stacked membranes, the distance between membranes cannot match the circulation rate of water to be treated in different application environments, which often leads to sticking of adjacent membranes. For example, a water treatment membrane stack whose diaphragms are stacked horizontally disclosed in patent 201510985976.3, if the spacing between the diaphragms is too small or the water flow disturbance is too large in the application environment, plus the permeable adsorption effect of the membrane surface itself, It is easy for two membranes to be bonded, which not only reduces the membrane surface area for effective water treatment and reduces the water treatment efficiency, but also makes it easy for dirt to accumulate on the bonded membrane surface, aggravating the membrane The degree of pollution will greatly shorten the service life of the membrane stack

At present, the conventional solution adopted in the industry is to increase the installation distance of the diaphragm to ensure the safe distance between two adjacent diaphragms. Although it can reduce the pollution of the membrane surface to a certain extent and improve the service life, the excessive diaphragm distance will reduce the The water treatment capacity per unit volume of the membrane stack is reduced, and the water treatment capacity of the same volume of the membrane stack is reduced. To achieve the same level of water treatment, it is necessary to increase the volume of the membrane stack and increase the corresponding production cost, which is not suitable for some application environments. In a narrow place, there are many inconveniences

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