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WATER MANAGEMENT


Inlet loading at WWTP


The output trend shown below, right. from an ASP-Con installation in 2014 indicates over-aeration of the process when ammonia loads are low, giving opportunities for aeration energy savings. Only when  are accurate and repeatable can they implement full optimisation regimes.  feed-back load measurement, reliable and accurate measurement of the critical set-points and online monitoring of bacterial measures of performance such as settlement, MLSS and SVI we can turn our attention to the integration of the instrumentation into the plant PLC-based control systems. Connectivity of instrumentation has been  protocols so the remaining challenge turns to data management and the control strategies, which can be applied. This is undoubtedly the next stage in the development of truly resilient wastewater assets. Strathkelvin Instruments is co-operating with AEMA in Spain to develop an advanced real-time control strategy based on the ASME3 model for management of the AS process due for release in Q1 2018. Current control strategies are being adapted on several of the company’s client sites to introduce decision making, variable set-points and aeration energy optimisation based on the increasingly detailed and accurate information available from the advances in instrumentation provided by the ASP-Con system. One question remains: how far can this change


     circumstances and there is a requirement to zealously manage risk to the receiving environment. On the other hand, the risk to human life is not immediate from    


Outlet load from WWTP


   of fully tapping into advanced real-time control of the activated sludge process are improvements in discharge compliance from early detection and management of upset conditions, reduction in carbon footprint due to the reduction of control system margins and direct cost savings due to energy consumption reduction.


Dissolved oxygen high point calibration curve


Applying the techniques described above and combining them with resource and energy recovery in the process could lead to wastewater treatment regularly  and costs pressures, the industry is slow to take up new technologies so it is likely to be many years before the question is fully resolved. In the mean time there are  gained from fully adopting the improvements currently available. 


Michael Dooley is managing director of Strathkelvin Instruments. www.strathkelvin.com


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