RO online sterilization system and method

Abstract

The invention discloses an RO online sterilization system and a method, the system comprises a non-oxidant metering box unit, a metering pump unit and a dosing pipeline unit, two sterilizing agent metering boxes are arranged in parallel and can be respectively provided with different sterilizing agents, and necessary connecting ports and magnetic turning plate liquid level meters are arranged in a matched manner; water inlet main pipes of two metering pumps are connected with a water tank and provided with pipeline filters, an outlet of each metering pump is provided with a safety valve, and a main outlet pipeline is provided with an anti-corrosion pressure gauge and a damper. According to the utility model, selective single-set sterilization or multi-set simultaneous sterilization can be realized according to the microbial pollution degree of the reverse osmosis membrane unit, so that the reverse osmosis microbial pollution is convenient to control and eliminate; the double boxes are provided with different sterilizing agents, an efficient sterilization method is adopted, the sterilization effect is improved, and meanwhile the influence of biological drug resistance on the sterilization effect can be avoided and eliminated.

Description

technical field [0001] The invention relates to an RO online sterilization system and method, belonging to the field of advanced treatment and reuse of industrial wastewater by membrane method. Background technique [0002] For the advanced treatment of industrial wastewater by membrane method, due to the high content of conductivity, hardness, COD and microorganisms in the wastewater, the water quality is complex and fluctuates greatly, especially microorganisms (that is, bacteria, algae, fungi, viruses and other higher organisms). But it differs from inanimate particles in that they have the ability to reproduce and form biofilms under suitable living conditions, causing biofouling of reverse osmosis (RO) membranes. [0003] The incoming water needs to be pretreated before entering the reverse osmosis. The treated water quality meets the water quality standard of the reverse osmosis. Generally, chlorine will be added for sterilization, such as sodium hypochlorite, chlorine...

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Problems solved by technology

But it is different from inanimate particles in that they have the ability to reproduce and form biofilms under suitable living conditions, causing biofouling of reverse osmosis (RO) membranes

[0003] The incoming water needs to be pretreated before entering the reverse osmosis. The treated water quality meets the water quality standard of the reverse osmosis. Generally, chlorine will be added for sterilization, such as sodium hypochlorite, chlorine dioxide, etc., to sterilize and control the growth of microorganisms. However, in order to prevent the membrane from being oxidized, Dosing reducing agent before RO water intake for dechlorination treatment, control free chlorine < 0.1PPM, this will lead to no fungicide after the reducing agent dosing point, after the residual microorganisms enter the reverse osmosis system, find the soluble organic nutrients in the water , these organic nutrients are concentrated and enriched on the surface of the membrane along with the reverse osmosis process, which becomes an ideal environment and process for the formation of biofilm, and microorganisms will multiply in a short period of time

The formation of biological fouling will seriously affect the performance of the reverse osmosis system, and the pressure difference between the feed water and concentrated water will increase rapidly, especially in summer, which will lead to serious microbial contamination of the membrane elements, increase the pressure difference, and a sharp drop in membrane water production, sometimes even Biofouling can also occur on the product water side of the membrane element, resulting in product water contamination

[0004] Difficult to clean once biofouling occurs and biofilms develop

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