LONDON, ONTARIO
The Challenge As one of the largest cities in the Canadian province of Ontario, the City of London is home to over 300,000 people. And as is the case with many of the municipalities across North America, aging infrastructure presents tremendous challenges that need to be addressed. Within the City of London, the Environmental Services Department (ESD) Wastewater Treatment Operations (WTO) Division manages six wastewater treatment plants located along the Thames River and Dingman Creek, along with 36 pumping stations. The Department takes great pride in the services they provide to the community, but the six plants (Greenway; Adelaide; Pottersburg; Vauxhall; Oxford; Southland), which collectively handle over 200,000 cubic meters of waste per day, range in age from at least 50 years old to over 100 years old. It was essential for the City of London and the ESD to continue to provide efficient and cost-effective services to their residents, and the optimization of their facilities seemed to be the key component. Instead of being overwhelmed by the challenge, they took it on as an opportunity to make their facilities and services even better than they had been historically. The Solution To begin the plant optimization process, the city researched the benefits of the Process and Systems Upgrade (PSU) program offered by Ontario Power Authority (OPA) to tap into any available funding. London started with an assessment of the Vauxhall plant, which included a detailed engineering study (funded by OPA) to identify the equipment and technology necessary to address the needs of the facility. It was determined that the PSU would address energy optimization and ultimately plant efficiency utilizing online technology. The ESD then established Adelaide as an online instrumentation pilot plant, and put out a bid to find the best supplier to partner with for the project. “YSI diligently put together a comprehensive monitoring solution that met our needs,” says Mark Spitzig, Wastewater Treatment Operations/Maintenance manager for the City of London. YSI worked closely with plant’s technical team and the local representative organization, SPD Sales Ltd., to determine the ideal instrumentation and probes to be installed in the channel and insertion mounted in key locations throughout the plant. The sensors would measure typical parameters such as dissolved oxygen, temperature, total suspended solids, sludge level, pH and ammonia. All monitoring and online process instrumentation was tied in to a YSI IQ SensorNet 2020, a universal controller, which was then tied in to the SCADA system via Profibus DP.
Objective: Plant Optimization Leads to Increased Energy Efficiency and Cost Savings
The effluent channel with effluent probes, measuring DO, pH, temperature and TSS
Acknowledgements Many thanks to Mark Spitzig for providing his experience with the IQ SensorNet system and sensors. Mark is the manager of Wastewater Treatment Operations/Maintenance for the City of London, Ontario.
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