A membrane concentration system and method

Abstract

The invention relates to a membrane concentration system. The membrane concentration system comprises N concentration membrane assemblies, wherein each concentration membrane assembly is configured to concentrate a liquid which is supplied to the concentration membrane assembly; and a to-be-concentrated solution supplied to the membrane concentration system generates a final concentrated solution with an expected concentration through M stages of concentration operations, wherein each stage of the M stages of the concentration operations is performed through one or more concentration membrane assemblies of the N concentration membrane assemblies; meanwhile, from the first stage to the M stage of concentration operation, at least the total effective concentration membrane surface area of the concentration membrane assembly performing the i stage of the concentration operation is smaller than the total effective concentration membrane surface area of the concentration membrane assembly performing the i - 1 stage of the concentration operation; and i is larger than 2 and no more than M. The invention also relates to a method for multistage concentration by utilizing the above-mentioned membrane concentration system and a control assembly used for the above-mentioned system.

Description

technical field [0001] The invention relates to the field of membrane technology, in particular to a membrane concentration system and concentration method comprising a plurality of concentration membrane modules capable of multi-stage concentration of a solution to be concentrated, and more particularly to an algae liquid membrane concentration system and method. Background technique [0002] Filtration membrane is a material with high efficiency, energy saving, and simple filtration (or concentration) process. It is widely used in the concentration process of feed and liquid in the fields of food, biology, chemical industry and medicine. Bacteria, microorganisms, colloids, and macromolecular organic substances in the original solution can be intercepted by the membrane to achieve the purpose of separating the permeable liquid with a smaller particle size from the organic molecules, colloids, bacteria or microorganisms with a larger particle size, and achieve separation and ...

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Problems solved by technology

[0004] (1) The membrane concentration process in industry is difficult to achieve continuous operation, so there are certain difficulties in coupling with other streamlined operations

[0005] (2) On the one hand, when the volume of concentrated material required is small, it is difficult to obtain a higher concentration factor due to the large dead treatment area (or processing capacity) of the system; on the other hand, due to the large area of ​​the membrane Large, resulting in more intercepted and residual substances on the membrane, which reduces the yield of dry weight of substances in the concentrate

The existing system cannot adapt to the concentration needs of the change of processing capacity

[0006] (3) The conventional membrane separation system is a parallel connection of multiple membrane modules of the same specification (the so-called specifications generally include parameters such as membrane area or membrane pores). When concentrating, all membrane modules are concentrated and filtered at the same time. , the concentration is getting higher and higher, and there will be a part of the concentrate in each membrane module that is difficult to discharge, resulting in the loss of the substance in the concentrate and reducing the yield of the substance

For example, in actual production, if the initial feed liquid is 20 unit volumes, the feed liquid is concentrated to 4 unit volumes after being concentrated and dehydrated by membrane modules with 10 unit membrane area for a certain time T. At this time, the feed liquid has reached It must be high concentration, and it is well known that high concentration is very easy to cause clogging of the membrane surface; at this time, if the original 10 unit membrane area is still used to continue the membrane concentration treatment of the high concentration feed liquid, a large number of solid particles will be blocked. Retained and widely spread on 10 membrane modules per unit area, this situation reduces the yield of the concentrate to a considerable extent

For the concentrate to be concentrated with high preparation cost, it will cause a large waste

[0007] In addition, the function of the current membrane concentration system is relatively single, and it is impossible to realize arbitrary switching of continuous concentration of membrane modules in series and filtration of changes in the processing capacity of membrane modules in parallel on the same system

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