Post Water Treatment | Lime.| Chlorine | Carbon dioxide (CO2) Dosing | RO PLANT

Описание: SWRO Plant Training Series
Membrane-based Desalination Technology

What is post-treatment in Seawater RO based Desalination?
Why is Desalinated water corrosive?
What is the purpose of lime Dosing in post water treatment?
Why chlorine used in Post Treatment ?
Why Carbon dioxide ( CO2 ) Dosing done in Post Treatment ?

Post-treatment processes typically include stabilization, disinfection and corrosion control
Post treatment of permeate is required to meet the statutory product water quality requirements
The permeate from an RO plant is normally of very high quality since (almost) all potentially harmful substances such as micro-organisms and organic compounds are rejected by the membrane.

Desalinated water is very pure water, which is almost completely devoid of any dissolved salts or micro-organisms.
In addition, this desalinated water is corrosive because of its low pH and the absence of the absorption potential of carbon-based molecules that are usually found in natural water

Lime milk is required for pH control of the product water. The precise lime dose, together with the CO2 dose, will be estimated by the laboratory to control the pH and the LSI of the product water.

Re-mineralization/Stabilization Requirement for Stabilization Water produced by a reverse osmosis process

Water shall be stabilized by the addition of carbon dioxide and lime (calcium hydroxide).

The calcium is dosed via limewater, which is produced by mixing powdered hydrated lime with reverse osmosis permeate using a clarifier