The Activated Sludge Plant Controller (ASP-CON)
Multi-parameter Probe Optimizes Activated Sludge Plant performance
Since the discovery of the activated sludge process in 1913 many analytical methods have been applied to optimize plant performance. These analytical measurements report the conditions in the lanes, but none provide data regarding the health of the plant's biomass. As a result, many plants fall victim to toxic influent, clarifier bulking, poor ammonia removal, solids carry-over, poor energy performance, over-aeration, excessive wasting, non-compliant discharge and many other conditions that result from poor sludge management.
Lab Measurements Without the Lab
Continuous sludge health monitoring is now possible thanks to the development of the ASP-CON, the world's only in-situ respirometer. Only the ASP-CON provides continuous monitoring of Oxygen Uptake Rate - as well as many other parameters - yielding trended data previously only possible through extensive laboratory analysis and yielding only a single data-point. Never-before available, continuous, trended OUR can now be provided electronically, directly to your SCADA system for unprecedented sludge plant control.
Since the ASP-CON also monitors suspended solids, the device also reports Specific Oxygen Uptake Rate (SOUR), as well as Sludge Volume Index (SVI) and Stirred Sludge Volume Index (sSVI).
Extensive software enables the ASP-CON to perform settlement tests directly in the basin, yielding MLSS data as well as predicting the TSS value of the secondary clarifier's final supernatant. All these measurements are provided from the aeration lane, before the flow enters the secondary clarifier, and many hours before clarifier discharge.
Monitoring Against Toxic Influent
Since the ASP-CON aerates it's own sample, it can be applied in anoxic zones as a toxicity monitor for early detection of toxic influent. Detecting a single toxic event can help identify up-stream sources of toxicity and may save a plant from re-seeding operations where full recovery may take weeks.
Multiple Measurements from a Single Device
The ASP-CON also provides many of the conventional measurements needed for efficient plant control, including: Dissolved Oxygen, pH, Ammonium, potassium and temperature. Respirometry data provided by the ASP-CON can be used to determine the critical oxygen points for both heterotrophs and nitrifiers, as well as to optimize a plant's F:M ratio.
Self-cleaning and Self-Calibrating
The ASP-CON is designed for minimal maintenance and is provided as a complete system, including an electric winch, a rail-mounted industrial PC, auto-clean and auto-calibration. The PC provides connectivity to SCADA through Modbus as well as complete remote monitoring and control of the system. The calibration system automatically performs scheduled calibrations in-situ and holds enough solution for over a month of hands-free operation. With every measurement cycle, the ASP-CON automatically cleans all sensor heads.
The ASP-CON is the only device available that provides continuous, trended respiration data. By combining this data with other key process-control parameters in a single instrument the ASP-CON represents a breakthrough in sludge plant control technology, performing in-situ "laboratory" measurements, reducing labor-intensive tasks and providing reliable and consistent data that results in improved automatic control of aerobic wastewater treatment plants.