I would like to ask whether the pH value at the desalinated water outlet is adjusted?
Thread Content
I would like to ask the experts: is it necessary to adjust the pH value at the outlet of the desalinated water? Should each unit adjust the pH value to 8-9 at the desalinated water outlet, or should each facility do it on its own?
Desalination is meant to remove ions; adjusting the pH then adds ions back in, doesn’t it? Moreover, the standard pH range for desalinated water is already 6-8 – why adjust it?
I think the poster’s question relates to the operation of the reclaimed water treatment process or the chemical water treatment process. Whether to adjust the pH after desalinating the raw water or upstream feed water depends on the water quality requirements of the downstream processes. For the feedwater in drum boilers, the pH value of the incoming water is generally adjusted to a slightly alkaline level. For the makeup water in closed-loop systems, reclaimed water from wastewater treatment can be used as the makeup water; in such cases, it may also be necessary to adjust the water quality appropriately, including adjusting the pH value. The OP’s question is a bit unclear.
To adjust the pH value, you need to do so according to your needs; some desalinated water does not require such adjustment, but it is definitely necessary to adjust it when using it in boilers.