Reverse osmosis (RO) water production system having multi-recovery rate adjusting function

Abstract

The invention discloses a reverse osmosis (RO) water production system having a multi-recovery rate adjusting function. The water production system comprises a raw water TDS (total dissolved solids) probe, a first filter element for prefiltration, a low pressure switch, an influent water electromagnetic valve, a second filter element for prefiltration, a booster pump and an RO membrane treatment device which are sequentially connected, wherein the water outlet end of the RO membrane treatment device is provided with a purified water outlet and a concentrated water outlet; the water outlet is sequentially provided with a check valve, a high pressure switch and a purified water TDS probe; the check valve, the high pressure switch and the purified water TDS probe are further connected with a pressure pot; the concentrated water outlet is provided with a first branch and a second branch; the first branch is provided with a variable series combination electromagnetic valve for direct discharge; the second branch is a concentrated water return pipe; the outlet end of the concentrated water return pipe is connected with a water outlet of the first filter element for prefiltration; and the concentrated water return pipe is provided with an adjustable reflux module and a check valve.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a reverse osmosis water production system with the function of adjusting multi-stage recovery rate. Background technique [0002] The water efficiency of ordinary household reverse osmosis water purifiers is relatively low, and the recovery rate of purified water generally does not exceed 30%, resulting in a great waste of water resources. At present, the working mode of the general water-saving water purifiers on the market: use the current limit of the discharge or change the ratio of concentrated wastewater to discharge, and the ordinary computer control board will energize or close the working frequency of the concentrated discharge solenoid valve to realize the discharge of concentrated water. In order to achieve the so-called water-saving mode, but the working mode of these water-saving water purifiers will increase the workload of the RO membrane and the booster pu...

AI Technical Summary

Problems solved by technology

[0002] The water efficiency of ordinary household reverse osmosis water purifiers is relatively low, and the recovery rate of purified water generally does not exceed 30%, resulting in a great waste of water resources

At present, the working mode of the general water-saving water purifiers on the market: use the current limit of the discharge or change the ratio of concentrated wastewater to discharge, and the ordinary computer control board will regularly energize or close the operating frequency of the concentrated discharge solenoid valve to realize concentrated water discharge. In order to achieve the so-called water-saving mode, but the working mode of these water-saving water purifiers will increase the workload of the RO membrane and the booster pump, which will accelerate the reduction of the desalination rate and life of the RO membrane, and increase the probability of machine failure. Unable to scale up in the market

[0003] To solve the problem of large discharge of concentrated water and flushing water, the current mainstream technology is reflux circulation water production technology. Its main feature is that a pipeline is drawn from the concentrated water outlet of the RO membrane treatment device, through which all or part of the concentrated water The water returns to the water inlet of the booster pump, and a throttling valve is set on the return pipe to control the return flow of the concentrated water. When the machine stops for a long time and does not produce water, the concentrated water in the RO membrane soaks the membrane, which will lead to a decrease in the life of the RO membrane.

There are also some machines blindly pursuing a water-saving process with a high recovery rate. Due to the difference in water quality in different regions, the concentration of the concentrated water produced by the water production process that uses concentrated water backflow in this high recovery rate is too high, resulting in the failure of the RO membrane. The concentration of influent water increases, which accelerates the attenuation of the RO membrane, accelerates the fouling speed of the RO membrane, and shortens the life of the RO membrane.

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