Wastewater Clarifier Liquid Level Sensor

chemical-feed
chemical-feed

Municipal clarifiers are basically settling tanks designed to remove particulates and suspended solids from wastewater. Prior to entering the clarifier, flocculation reagents are often added to help suspended particles clump together and be more easily removed by the process. Concentrated impurities discharged from the bottom of the tank are known as sludge, while the particles that float to the surface of the liquid are called scum. As scum builds up on the surface of the liquid, it must be periodically skimmed off and removed before it negatively effects the separation process. Here, an EchoPod ultrasonic level transmitter is installed behind the skimmer, and measures the liquid level height at the point where the wastewater transitions from the first to second clarifier. Slight changes in liquid level will indicate a problem with the gravity fed system. The non-contact sensor’s two-wire 4-20 mA signal is connected to the SCADA for level monitoring and alarms.