Immersion type hyperfiltration membrane technique operated in the same diaphragm cell and various membrane units

Abstract

The invention discloses a process for the separate operation of membrane units in a same membrane cisterna of an immersed type ultrafiltration membrane. The process is carried out through an operating device. The operating process comprises membrane air purge, back flushing and concentrated water treatment. The operating device comprises the membrane cisterna; two or more than two groups of membrane units are arranged in the membrane cisterna; separating and enclosing devices are arranged between the membrane units; a water producing device and a back flushing device are arranged on the upper part of each membrane unit; and an air purging device and a drainage device are arranged below each membrane unit. The process adopts a control mode of the equipartition of a cleaning interval for the membrane units in the same membrane cisterna, thereby achieving the continuous uninterrupted production of the whole membrane cisterna. When the membrane units in the same membrane cisterna run below the optimum membrane flux, water production is automatically balanced under the same transmembrane pressure difference, thereby improving the operating stability of a system. For a filtration system with more membrane units, the process carries out back flushing through a water tower (water tank) so as to reduce the energy consumption of the system.

Description

Technical field: [0001] The invention belongs to the technical field of water supply and waste water treatment and purification, and in particular relates to an operation process for cleaning a submerged membrane unit in the same membrane tank of an immersed ultrafiltration membrane. Background technique [0002] The fluid separation technology with ultrafiltration membrane as the core has been proved to be an efficient and pollution-free green technology, and has been widely used in food, medicine, biology, chemical industry, metallurgy, energy, petroleum, water treatment, electronics and other fields. Compared with the traditional fluid separation technology, this technology has the functions of separation, concentration, purification and refining, and has the advantages of high efficiency, energy saving, environmental protection, simple process and easy control, and has attracted more and more attention. [0003] Ultrafiltration membrane separation technology is a physica...

AI Technical Summary

Problems solved by technology

With the deepening of filtration, some pollutants even enter the interior of the membrane, and general cleaning cannot restore the filtration performance of the membrane, so it is necessary to use chemical agents to soak to clean the deep pollution in the membrane.

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