Water and Effluent Treatment Magazine
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Nomenca is installing and testing the mechanical and electrical components of the new works Optimising energy savings through real-time control "The power generation of the AD plants is fairly stable, but the energy demand of the treatment plant varies according to the load" Garry Orford. Wessex Water success at Taunton." Following completion of the new works, the site will meet the following consent conditions: • Dry Weather Flow (DWF) 30,595m 3 /d • Sanitary parameters BOD:SS: AmmN 15:30:3mg/l In addition to the upgrade of the sewage treatment facilities, a third anaerobic digester (AD) is also being built at the Taun- ton works. "This will increase our capacity to generate renew- able energy and further reduce our electricity bill," says Orford. "The power generation of the AD plants is fairly stable, but the energy demand of the treat- ment plant varies according to the load, so there will be occa- sions where we can sell energy back to the grid, and others where we will continue to have a power requirement. It is essen- tial therefore that we use this power as efficiently as possible." Real-Time Control in indus- trial processes is commonplace. However, wastewater monitor- ing represents a greater chal- lenge because of its physical and chemical variability. Health status Historically, wastewater moni- toring technology was prone to dri' (especially galvanic dis- solved oxygen monitors) and required a high level of mainte- nance, so RTC was not feasible. However, the latest sensors offer much higher levels of reliability than was possible in the past, with substantially lower levels of maintenance and recalibration. This has been a major fac- tor in enabling the development of RTC in wastewater treatment. Also, many of the latest sensors provide a 'health status' output in addition to the readings. As a result, if any problems arise they can be quickly reme- died, and control systems can ignore data from sensors that are not performing to their tar- get specification. The capital outlay for the addition of RTC to a treatment plant is relatively small; the most significant extra cost is the requirement for extra sensors plus the RTC unit. The Taunton build includes the installation of the latest sensors for dis- solved oxygen, ammonium and turbidity, controlled by an sc1000 network, providing reli- able data on the influent, and from within the treatment process. The LDO sc dissolved oxygen sensor employs an optical lumi- nescence method for www.evoquawater.co.uk info.uk@evoqua.com © 2014 Evoqua Water Technologies Ltd Key benefits of upgrading your Activated Sludge Plant to a BioMag™ System • Simplicity and reliability • Enhanced nutrient removal (ENR) • 3X activated sludge capacity without new tankage • 5X hydraulic capacity • TN < 3.0 mg/L and TP < 0.2 mg/L embrace gravity. defy convention. The BIOMAG™ SYSTeM Increase plant throuput, eliminate clarifier bottlenecks and improve secondary effluent quality by retrofitting your Activated Sludge Plant with BioMag™ System. The BioMag™ System can double if not triple a plant's existing biological treatment capacity and achieve enhanced nutrient removal limits — all within existing tankage — and has been proven at multiple industrial and municipal facilities.