The internal problems and solutions of RO reverse osmosis equipment are shared in the front. Then when RO reverse osmosis equipment encounters exterior factors of extremely low temperature environment, how can RO reverse osmosis equipment operate in low temperature environment to give full play to its reverse osmosis performance?
Raise the water temperature of raw water:
This is a simple and crude method, we know that low-temperature water is easy to freeze and expand, causing potential threats such as equipment rupture. It is a very direct way to raise the temperature of the incoming water. The common ways of raising the temperature are: heating in the pipe with plate heat exchanger or heating in the pretreatment tank with steam coil. This method is often used in equipment installation area where there is heat source.
By increasing the operating pressure of the system, the shortage of water production can be remedied.
The water flux in reverse osmosis membrane system is proportional to the operating pressure. Therefore, the water yield can be increased by increasing the operating pressure in the case of low water temperature. Frequency conversion pump can be used to achieve output balance at different temperatures.
Advantages of using frequency conversion pump: energy saving, increasing system operation flexibility and soft start of the system, etc.
Using low pressure (high flux) RO membrane elements:
Frequent use of two methods will inevitably increase the energy consumption of the system, we can also choose three options, that is, using large flux of low-pressure reverse osmosis membrane components to reduce the operating pressure of the system, so as to avoid long-term operation of the reverse osmosis system under ultra-high pressure or even extreme pressure.
It is noteworthy that the design of RO system should take into account the temperature range of system operation, and the changes of system performance at high temperature should also be taken into account when considering the low temperature factors. For example, the membrane flux (system output) of many systems will increase and the desalination rate will decrease due to the increase of water temperature in summer. At this time, the system should be adjusted according to the requirement of end-users for water quality and quantity. For example, some large-scale desalination systems choose to shield part of the membrane module to ensure high water quality at high temperature in summer.