Project Appreciation and Objectives
Reliable and robust dissolved oxygen (DO) measurement is fundamental to aeration control and optimisation of the energy demands of activated sludge processes. Good DO measurement results in good aeration control leading to reliable treatment and minimised energy use. Yet, despite a genuine advance in DO sensor technology, a number of factors confound the successful and reliable application of DO monitors. Issues most commonly cited are fouling, unreliable cleaning systems, manual maintenance requirements, and conflict between specified maintenance requirements and required real-life requirements, leading to impaired instrument performance.
This project will address these issues through the most significant and comprehensive trial of wastewater DO monitors undertaken by the UK water industry for over a decade, and deliver a major resource of information to support companies in the selection and operation of wastewater DO monitors through future investment.
Business Benefits to Clients
Participants will gain the following benefits from the project:
- Fully informed instrument selection and procurement of DO monitors based on real-life costs and performance with improved cleaning and maintenance procedures.
- More reliable control of the activated sludge process with reduced risk of compliance failure, reduced energy costs, and carbon emissions.
Substantial discussions have already been held with a number of wastewater utilities
and agreement has been reached on the test site, which will include two applications in typical locations, and on the maintenance of the sensors during the trial, which will replicate as closely as possible normal practice.
- Selection of trial instruments via open invitation. Production of performance specification and supplier briefing document.
- Eight month site trial at Wanlip sewage treatment works (Severn Trent Water) on both surface aeration and fine bubble diffused aeration treatment processes.
- Analysis of performance and cost of ownership for each system.
- Production of a trial report and individual summary reports for each of the suppliers.
Project Output and Implementation
The project will deliver a major resource of independent evidence and information on selected DO monitors performance for use by companies for intelligent procurement and operation of wastewater DO monitors.
Related WRc Work
WRc provides independent testing and evaluation of instrumentation for both manufacturers and end users. Examples of wastewater testing include: ultrasonic level sensors, ammonia, phosphate and suspended solids monitors. WRc also undertakes testing of wastewater samplers, flow monitors and continuous quality monitors against MCERTS.