Concentrated water recycling method and filtering system with concentrated water recycling function

Abstract

The invention provides a recycling method capable of improving the concentrated water recycling rate and a concentrated water recycling system. The method comprises the following steps: collecting concentrated water obtained by reverse osmosis filtration into a vessel, releasing a certain amount of concentrated water from the vessel when a user opens a mixed water faucet, mixing the released concentrated water with raw water, and outputting the mixed water from the mixed water faucet. The release amount of the concentrated water is determined by virtue of the following mode: a microcomputer device recalls corresponding control parameters from a database according to the collected raw water pressure value, raw water TDS (Total Dissolved Solid) value, concentrated water pressure value and concentrated water TDS value so as to control the opening time and/or opening degree of a concentrated water release valve. The method is applied to the system. The method has the advantages of high recycling rate, easiness for realization, and the like; the system has the advantages of causing no influence on the service life of a reverse osmosis membrane, completely consuming the concentrated water generated each day, being high in automatic control degree and relatively simple in system constitution, and the like.

Description

technical field [0001] The invention relates to a method for reusing concentrated water in the field of reverse osmosis water purification and a filter system with reusable concentrated water. Background technique [0002] The traditional reverse osmosis water purifier will produce a certain amount of concentrated water during the water purification process. At present, the products in the water purification industry connect the concentrated water outlet pipe of the reverse osmosis water purifier directly to the sewer pipe to drain the concentrated water directly. With the increasing shortage of water resources in the world, it leads to serious waste of water resources. At present, there are three main ways to improve the recovery rate (water utilization rate) of reverse osmosis water purifiers: [0003] The first way is to introduce the concentrated water of the reverse osmosis water purifier into the RO membrane pretreatment device or the tap water inlet, mix it with the ...

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Problems solved by technology

[0003] The first way is to introduce the concentrated water of the reverse osmosis water purifier into the RO membrane pretreatment device or the tap water inlet, mix it with the raw water and then enter the reverse osmosis water treatment system for recycling, but this way is easy to cause reverse osmosis Membrane clogging greatly shortens the life of the reverse osmosis membrane, thereby increasing the cost of water treatment, and the reuse of concentrated water also loses its use value. This problem has also become a bottleneck for the adoption and promotion of this method. At the same time, this method The adaptability of water quality is very poor, and the change of raw water quality has a great impact on the system, making it difficult to guarantee the stability of the system;

[0004] The second method is to collect the concentrated water from the reverse osmosis water purifier in a container and use it as water for watering flowers, mopping the floor, and flushing the toilet. Floor and toilet flushing water is limited, so the practicability is not strong, and the operation is troublesome

[0007] In the comparison of the above methods, the third method is a better solution, but it also has some disadvantages: the capacity of the mixed water storage container is the sum of the stored concentrated water and tap water. The volume of the storage container is limited. In order to maintain the water quality of the mixed water in the mixed water storage container, the concentrated water or mixed water that cannot be accommodated must be discharged directly. In this case, a lot of concentrated water or mixed water will still be lost.

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