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Network Control in Sewer Networks and Sewage Treatment Plants
The Aggerverband is a water resources management company in the state of North-Rhine Westphalia in West Germany. It was founded in 1943. Across a region covering more than 1,000 km2, the Aggerverband currently operates 38 sewage treatment plants, ca. 150 rainwater processing plants and 229 wastewater pumping stations.
System Concept
For process operation and monitoring, an IDS HIGH-LEIT SCADA system is installed whose structure is based on a wide-area network (via dedicated lines) run by German Telekom with a transmission rate of 64/128 kBit/sec. And 2MBit/sec., respectively. All central and decentral computer systems are connected to this WAN via router. Central components are redundant control and MMI computers for the evaluation of data and system maintenance.
Today, the complete operation and monitoring of the sewage treatment plants and sewer networks of the Aggerverband is distributed across seven control centres which are connected to the WAN via router.
The RTUs are parameterised via “down-line load”; the hardware structure and the data model of the RTU are defined completely via central parameterisation in the SCADA system. The data model of the IDS HIGH-LEIT SCADA system is designed for an ultimate scope of 700 RTUs and includes ca. 40,000 process variables.
A three-stage alarm concept was developed to support the staff on call duty.
From today’s perspective, the HIGH-LEIT SCADA system is future-proof, thanks to its modular structure.