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Process Adaption of a Small WWTP Operated at Low Loading Conditions for Substantial Energy Savings

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Document pages: 8 pages

Abstract: The very long traditionof the activated sludge treatment model within the water industry hasdemonstrated very versatile possibilities to adopt the operation mode fordifferent enhancements. By looking into other treatment models within theactivated sludge family it is possible to find alternatives for the operation.This paper concentrates on the possibilities to improve even small WWTP withrespect to energy savings. The small plant in Northern Sweden, called RosvikWWTP, is given as an example. Some important findings related to theintermittent aeration mode may be summarized as follows: 1) An energy savingsfor the operation of the small WWTP with respect to aeration needs thatresulted in a decrease of the energy power supply by more than 35 , as comparedwith the previous operation based on continuous aeration; 2) The up to dateeffluent levels with respect to the main pollutants have remained at very goodlevels in 2020, P-level averages 0.16 mg P l versus consent level 0.5 mg P l; COD-level 40 versus 70 mg l and BOD7 9 versus 15 mg l; 3) Sometimes, also improved sludge settling characteristicshave been observed, thus providing improved discharge figures; 4) The potentialto develop an enhanced biological phosphorus removal. There are however some needed conditions to accomplish theseimprovements: 1) Reliable on-line probes for both oxygen control,SS-concentration control and optionally also for nitrogen control; 2) Aflexible automation system that allows the needed process modifications to takeplace; 3) And finally, very important dedicated and competent plant operators,with the needed curiosity for operation improvements.

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