Continuous overflowing type membrane filtering device and method

Abstract

The invention discloses a continuous overflowing type membrane filtering device and method. By a multi-stage booster pump, segmented pressurization can be effectively carried out on a multi-segment membrane filtration module; the membrane element of each filtering module has proper membrane permeation pressure, the membrane retentate concentrated solution of each filtering module continuously enters the next section of filtering module connected in series until being finally discharged out of the membrane device, the membrane retentate concentrated solution does not circularly flow back any more, and the retentate does not circularly accumulate to pollute the membrane element, so that higher membrane filtering efficiency is obtained. Through bypass arrangement, a working module can be skipped, flexible selection can be achieved according to actual production requirements, and the practicability is high. The booster pump is matched with parameters of pressure monitoring instruments andflow monitoring instruments at all sections to adjust the pressure and the flow and is in linkage adjustment with an electric adjusting valve, pressurization can be accurately carried out, and the continuous overflowing type membrane filtering device is high in safety and stability and has important value in the fields of liquid solute membrane filtration and liquid solute membrane concentration.

Description

technical field [0001] The invention relates to a device and method for concentrating or filtering liquid solutes, in particular to a continuous overflow membrane filtration device, which belongs to the field of concentrating and filtering liquid solutes. Background technique [0002] Membrane separation is a physical process, and its basic principle is to use a membrane with selective permeability to separate, filter, and Concentration process. Because membrane separation technology has the functions of filtration, fractionation, solute concentration, solute purification and refining, and has the characteristics of high efficiency, energy saving, environmental protection, molecular level filtration and simple filtration process, easy to control, etc., it has been widely used in food and medicine. , chemical industry, biology, environmental protection, metallurgy, energy, petroleum, water treatment, electronics, bionics and many other fields, has become one of the most impo...

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Problems solved by technology

[0003] At present, the process of membrane filtration device mainly adopts batch full circulation filtration process or forced internal circulation continuous filtration process. The device is equipped with a booster pump and multiple forced circulation pumps. These two membrane filtration devices have many problems, among which batch The membrane intercepted substances of the membrane device in the permanent circulation filtration process have been in the circulation tank and the membrane device during the batch operation time. There is no discharge device. Rapid decline, low membrane filtration efficiency; Among them, a large part of the membrane retentate of the forced internal circulation continuous filtration process membrane device will also exist in the forced internal circulation membrane group, resulting in the contamination of the membrane elements in the membrane group by the retentate. The volume drops rapidly, and the membrane filtration efficiency is low; the current membrane filtration device only has a booster pump. As the concentration of the retentate rises, the osmotic pressure of the membrane is required to be higher, and a booster pump cannot provide higher osmotic pressure. Membrane flux is low, and membrane filtration efficiency cannot be exerted

[0004] "Patent 200910129343.7" proposes a multi-stage continuous reverse osmosis membrane concentration system. A booster pump is installed behind each membrane stack to improve membrane filtration efficiency. However, the booster pumps are too dense, and the number of membrane elements in advanced membrane stacks gradually increases. Reduced feed liquid flow rate is too large; and when the feed liquid flow rate is small, the membrane stack cannot be selectively put into operation, and the lower concentration ratio requirement cannot be achieved

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