Recent low-cost IoT devices such as Libelium Waspmote provide a simple and economical solution to monitor water quality characteristics. To have an understanding of water quality a number of its physical and chemical properties should be measured such as: pH, dissolved oxygen (DO), oxidation-reduction potential (ORP), conductivity (salinity), turbidity, temperature and dissolved ions (Na+, Ca+, F-, Cl-, Br-, I-, Cu2+, K+, Mg2+, NO3-).
A key test of water quality is measuring of turbidity. Turbidity is a measure of degree to which the water loses its transparency due to solid particles. Nephelometric turbidimeters measure suspended particulates by employing a light beam (source beam) and a light detector set to one side (often 90°) of the source beam. In the United States environmental monitoring the turbidity standard unit is called Nephelometric Turbidity Units (NTU)
Turbidity monitoring is important in the following scenarios:
– Urban waste water treatment
– Sanitation network
– Industrial effluent treatment
– Surface water monitoring
– Drinking water
Libelium’s Turbidity sensor was designed specifically for IoT applications and has a range from 0 to 4000 NTU (0-4500mg/l).
Generally water is potable if the measurement is lower than 1 NTU. Drinking water utilities use different filtration methods and aim to achieve 0.1 NTU.
If you have any questions about environmental monitoring, pollution measurement or just generally about IoT feel free to contact us.