The amount of sewage produced by reverse osmosis pure water treatment equipment is expressed as the ratio of wastewater and pure water of reverse osmosis pure water treatment equipment. Usually, the proportion is also different according to the water source and water production. Under normal circumstances, the ratio of small household pure water machines is 3:1, that of small industrial reverse osmosis systems is 1:1, and that of large systems is 0.3:0.7. That is, the amount of pollutants produced can be processed and used through the reuse system, so the ratio of waste water and pure water is not fixed, and even zero discharge can be achieved, but the cost is relatively high, and the service life of the reverse osmosis system is high. It will certainly not be long, so under normal circumstances it is not necessary to do zero emissions.
How can different recovery rates be achieved according to the number and arrangement of reverse osmosis membranes?
1) One-stage, one-stage continuous type
After membrane treatment, the permeated water and concentrate are continuously drawn out of the system. The characteristic of this method is that the recovery rate of water is not high
2) One-stage, one-stage cycle
Part of the concentrated liquid is returned to the feed liquid storage tank to be mixed with the raw material liquid, and then separated through the reverse osmosis membrane module again. Features The water quality of the permeate has decreased
3) One-stage multi-stage continuous type
The concentrated liquid of the previous stage is used as the raw material liquid of the next two stages, and the cut permeated water is continuously discharged. The characteristics are suitable for occasions with large water treatment capacity, the recovery rate is high, the amount of concentrated liquid is reduced, but the proportion of solute in the concentrated liquid is high.
4) One-stage multi-stage circulating type
The permeated water of the next stage is used as the raw material liquid of the previous stage, and the separation is carried out. In this way, the concentrate can obtain a higher degree of concentration and is suitable for separation as the main purpose of concentration.
5) Multi-segment cone arrangement
Both in parallel within the section and in series between the sections, this can not only meet the requirements of the water recovery rate of the reverse osmosis system, but also ensure that each component in the device has roughly the same flow state. A high-pressure pump is required to prevent a drop in productivity.
6) Multistage and multistage configuration of reverse osmosis membrane module
The multi-stage and multi-stage configuration of the reverse osmosis membrane module also has a circulating type to separate the permeated water of the first stage as the feed water of the next stage, so that the permeated water of the last stage is drawn out of the system continuously. The concentrated liquid is awakened and mixed from the feed liquid of the previous stage from the latter stage, and then separated. This approach improves recovery and water quality. However, the consumption of the pump increase and the continuous type is divided.
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