A kind of membrane method internal circulation concentration method

Abstract

The invention discloses an internal circulation concentration method of a membrane method, which comprises a booster pump group, a circulation pump group, a membrane assembly and a pipeline control accessory. The booster pump group and the circulation pump group respectively provide operating pressure and surface flow rate for a membrane system, Multiple internal circulation units are formed by circulating water pumps, check valves of pipeline control accessories and membrane components. The membrane system adopts rolled membranes; the booster pump group provides operating pressure for the membrane system. It is composed of a high-lift booster pump; the circulating pump group provides the membrane surface velocity for the membrane system, and is composed of one or several large-flow, low-lift circulating water pumps; multiple internal circulation units are connected in series, and the concentration of the internal solution is in a stepwise relationship. , matching the booster water pump between the inner circulation units to form a continuous operation system; the present invention is designed with different steps according to the final concentration multiple and concentration of concentrated water.

Description

technical field [0001] The invention relates to the technical field of membrane technology concentration and separation and sewage treatment, in particular to a membrane method for inner circulation concentration method. Background technique [0002] The current membrane equipment designers generally use the software provided by foreign membrane manufacturers such as Dow and Hyde Energy for design. However, these manufacturers mainly focus on membrane production, and are not good at membrane technology applications, especially in the treatment of difficult wastewater. Their design concepts are too conservative and are only suitable for treating water purification and seawater desalination with relatively stable water quality. However, the unreasonable equipment designed by the designers based on software such as Dow has serious defects when applied to concentrated separation and high-hardness, high-COD wastewater, resulting in fouling of the membrane, frequent chemical clean...

AI Technical Summary

Problems solved by technology

However, these manufacturers mainly focus on membrane production, and are not good at the application of membrane technology, especially in the treatment of difficult wastewater. Their design concepts are too conservative, and they are only suitable for water purification and seawater desalination with relatively stable water quality.

However, the unreasonable equipment designed by designers based on Dow and other software has serious defects when it is applied to concentration separation and high hardness and high COD wastewater, resulting in membrane fouling and frequent chemical cleaning, resulting in shortened membrane life. Even in relatively simple water reuse, the service life of the membrane is only 2-3 months, causing a huge burden and waste of resources to enterprises and society

[0003] In order to alleviate membrane fouling and fouling problems, disc tube membranes have appeared in the high-end market. However, disc tube membranes have disadvantages such as high investment costs, small membrane area per unit space, and low water production rate, and are only suitable for chlorination. Concentration of sodium high salt, in other applications, to solve the same problem, the investment is more than 5 times that of roll membrane

Also, due to the too many branches of the tube membrane, it cannot be emptied, and it is not suitable for handling proteinaceous media that are perishable.

[0004] like figure 1 , the existing membrane design is that the solution or wastewater for membrane treatment is sent into the membrane system through the raw water pump and the security filter, and the pressure in the equipment is raised to the pressure required for the water production of the membrane element through a single high-pressure pump; the solution or The wastewater passes through the first and second membranes in turn, and the produced water enters the clean water tank; when the concentration is relatively low, such as less than 3 or 4 times, the concentrated water will directly enter the concentrated water tank; but when the concentration is relatively high, the concentrated water needs to be returned The raw water tank is repeatedly concentrated and processed in batches; sometimes in order to increase the concentration ratio, a "big return pipeline" is added, that is, the pipeline where the concentrated water return valve 18 is located, returns to the inlet of the high-pressure pump to increase the membrane surface flow rate; but In this way, a larger high-pressure pump needs to be selected, and the waste of power consumption is huge; and when adjusting the operating pressure of the system, it is necessary to repeatedly adjust the concentrated water regulating valve 17 and the concentrated water return valve 18

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