Dynamic model of a municipal wastewater stabilization pond in the Arctic
|Theme||1. Environmental protection|
|Session Name||1.8 Modelling and control of water and wastewater treatment in the Arctic conditions|
|Author(s)||Boris Tartakovsky (National Research Council Canada, Canada), Andrew Colombo (National Research Council Canada, Canada), Yehuda Kleiner (National Research Council Canada, Canada)|
Waste stabilisation ponds (WSPs) are the method of choice for sewage treatment in most Arctic communities in Canada because they can operate in extreme climate conditions, they require a relatively modest investment, they are passive and therefore easy and inexpensive to operate and maintain. However, most arctic WSPs are currently limited in their ability to remove carbonaceous biochemical oxygen demand (CBOD), total suspended solids (TSS) and ammonia-nitrogen. An arctic WSP differs from a 'southern' WSP in the way it is operated and in the conditions under which it operates. Consequently, existing WSP models cannot be used to gain better understanding of the arctic lagoon performance. This work describes an Arctic-specific WSP model. The model accounts for both aerobic and anaerobic degradation pathways of organic materials and considers the periodic nature of WSP operation as well as the partial or complete freeze of the water in the WSP during winter. A multi-layer approach was taken in the model development, which significantly simplified and expedited model solution, enabling efficient model calibration to available field data. This paper also provides an update on the ongoing effort to overcome the current dearth of data relevant to the performance of Arctic lagoons.
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