Ces contaminants peuvent être des matières dissoutes totales. Ils sont des contaminants organique et inorganique pouvant se retrouver dans l’eau de façon naturelle ou non.
Generally speaking, dissolved materials are calcium, magnesium, sodium or potassium cations. They can also be anions such as carbonate, bicarbonate, chloride, sulfate or even nitrate.
The Source
As stated above, they can be from human activity or they can be from natural sources: typically, soil erosion, runoff or decomposition of flora and fauna. In terms of human activities, road de-icing in Canada is one example of human actions that can promote the spread of TDS in Canadian waters.
Why monitor them?
Although water concentrated in total dissolved solids is not hazardous for human consumption, water highly concentrated in TDS may be an indicator of poor treatment. It is important to note that while TDS in water is not hazardous for human consumption, concentrations of 1000 mg/L and above are considered unfit for human consumption.
The World Health Organization, after various studies, has come to the conclusion that the acceptable TDS levels are as follows
Total dissolved solids in mg/L |
|
< 300 | Excellent |
300 -600 | Good |
600– 900 | All right |
900– 1200 | Poor |
>1200 | Very Poor |
To identify the amounts of dissolved solids in a sample, the easiest way is to use a total dissolved solids meter.
How to decrease the total dissolved solids in water?
L’extraction des MDT se fait relativement facilement. En fonction des types de matières dissoutes dans l’eau, les technologies comme l’osmose inversée, la nanofiltration, la distillation et la déionisation se sont prouvées efficaces pour diminuer les concentrations en matières dissoutes.