Hangzhou *** Wastewater treatment plant utilizes ARTang Open channel flowmeter and ultrasonic level meter, both using AAO (Anaerobic/Anoxic Aerobic) process.

The Anaerobic/Anoxic/Aerobic (A/A/O) process is widely used in municipal wastewater treatment plants and has good nutrient removal performance.

Open channel flowmeter is a non-contact meter. Its advantages lie in the large measuring range, flow measurement is not affected by the tributary surface backwater, floating sediment in the water, air bubbles and large changes in water level, and the flow sensor will produce resistance to the water flow, simple structure, small size, easy to install. Can be applied to city water supply diversion channel, thermal power plant cooling diversion river drainage canal, sewage treatment inflow and discharge canal, enterprise wastewater discharge and water conservancy projects and agricultural irrigation with channels, etc. Open channel flowmeter with other closed full pipe flow meter is different, in the non-full pipe state or open channel measurement of free surface natural flow flow meter.