Process measurement instruments for nutrient parameters are rarely employed in smaller plants (5000–20,000 pe). In general, the only instruments used are oxygen sensors for aeration control or probes for recording outflow turbidity as a measure of plant efficiency. However, small and medium sized wastewater treatment plants have to handle greater fluctuations in influent concentrations and hydraulic loading than their larger counterparts (e.g. distinctive diurnal variations, storm surges, illegal agricultural discharges etc.).

Furthermore, small plants have to function with ever fewer personnel, and as a result the case for instrumentation coupled with modern data transfer technology and, possibly,
automation technology becomes even stronger.

For the full article, please contact sarah.blayds@hach-lange.co.uk or call 0161 886 9905.