Can the conductivity of water increase with more dry matter in the aeration tank?
The conductivity of the water at outlet of a WWTP has recently increased to above the limit of 1100 µS/cm. The only significant event over this period has been an increase in the dry matter content of the aeration tank following a centrifuge failure.
Do you think that this could be the cause of the increase in conductivity?
Conductivity is a function of the salinity of the water, i.e. the amount of dissolved salts.It is likely that if your centrifuge has stopped, some of the dry matter has partially dissolved, increasing salinity and therefore conductivity. To confirm this hypothesis, you should also measure the conductivity at plant inlet and not just at outlet. Another possibility: conductivity increases rapidly in relation to chloride content. Are you sure there was no accidental release of chloride into your WWTP? Here again, measuring the conductivity at inlet would confirm this.Finally, still on the subject of chloride, do you use either ferric chloride or aluminum chloride to neutralize phosphorus?If so, over-injection may have occurred, resulting in a too high chloride concentration.
and of the temperature
Are you by the sea? If so, there may be saltwater infiltration from the network.Also check to see if there are any industrial customers connected.