The field of water and wastewater treatment faces challenges such as stricter regulation, aging infrastructure, and the need for increased operational efficiency. Traditional methods of operation are no longer sufficient, and utilities must become more aggressive in applying new technologies. This trend is driving the need for information-enabled systems that help ensure better operational decisions and better management of plant assets.
To be effective, plant managers need a comprehensive understanding of all aspects of a utility's operations. At a minimum, access to relevant, timely data is required so quick and accurate decisions can be made. The use of automated systems has been a key solution for improving operational efficiency. Implementation involves computer-controlled devices and remote monitoring over a fast and reliable network, such as an Ethernet-based SCADA system.
Telephone alarms have traditionally been used to monitor remote equipment in the water and wastewater industry. However, wireless technology is evolving rapidly and provides utilities with an opportunity to improve information flow and reduce operational costs. For example, outdoor WLAN units can be designed into the monitoring network to reduce the cost of long-distance wiring between stations.
In one wastewater treatment plant, wireless technology was used to establish a simplified network structure, as shown in the diagram. Real-time monitoring was possible due to fast, reliable Ethernet between the remote control center and the different water treatment stations. At various stations, the AWK-1200-AP or AWK-1200-AC was installed, forming a wireless communication network that could deliver data synchronously or in batches. For better range and signal quality, antennas were installed at the highest point possible. No other infrastructure change was required. Since AWK-1200 products are IP68/67-certified, they can easily withstand the rough elements of outdoor environments, such as rain, dust, and extreme temperatures. With the wireless network in place, field engineers could now check the status of each station from anywhere on the plant, using their PDA or mobile phone.
Wireless systems provide significant advantages over wired systems for certain applications, particularly those involving long-distance communication. These advantages are particularly applicable to water distribution systems and wastewater collections systems. For such applications, wireless networking reduces installation costs, adds flexibility, improves data collection, and potentially improves site security.
