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IViewOps is constructed on C# and Java, currently running on .NET. It has an asset based structure, with its models and algorithms geared for troubleshooting and plant optimization. It is being applied to full scale plants, storage, distribution, collection systems in Water and Wastewater Utilities and Chemical industries. The purpose is to identify and implement strategies optimize plants to reduce operating and life cycle costs while complying with permits for nutrient removal and reuse. From an asset management standpoint, it is used to find how to invest in the correct part of the plant infrastructure at the correct time with the correct size of project to upgrade capacity or performance.

Aquifas+ is the third generation of Aquifas constructed on the IViewOps platform. It has a proprietary algorithm that solves 120+ differential equations. The speed and accuracy are designed for operations control and optimization, which exceed the requirements for design. The model includes simulation of Green House Gas (emissions). It breaks up ammonia oxidation for ammonia oxidizing bacteria (AOB) for ammonium-N to nitrite-N and nitrite oxidizing bacteria (NOB) for nitrite-N to nitrate; reduction to nitric oxide to nitrous oxide by some nitrifiers; four step denitrification by ordinary heterotrophs (OHO), polyphosphate accumulating bacteria (PAO) and methanotrophs (MHO). It has been applied to full scale plants to identify strategies to simultaneously enhance nutrient removal and reduce GHG emissions.

AquaNET (Aquifas) is the second generation model with a .NET interface developed before 2010. It can be applied for design and operation of activated sludge, membrane bioreactor (MBR), IFAS and MBBRs, trickling filters and denit filters. It can be run for steady state and dynamic simulations. Users can configure reactors, specify number of cells in series (up to 12), and amount of media in each cell. The activated sludge component implements the entire IWA ASM2d Model (Henze et al., 2000) - all 19 equations. The kinetic coefficients overcome some of the limitations in ASM2d. The biofilm component uses a combination of semi-empirical and diffusional models.

The models include Headworks, Primary Treatment and Solids handling. Headworks include equalization, recycle from solids handling, primary clarification. Solids handling includes thickening, aerobic and anaerobic sludge holding tanks and digestion, struvite and vivianite formation, and dewatering.

Both models improve accuracy of biofilm simulations by using a biofilm diffusional model that simulates substrates, electron acceptors and bacteria in multiple layers of the biofilm and a stagnant liquid layer, and connect the diffusional model to semi-empircal models. It is similar to 1 & 2D models presented by IWA Task Group on Biofilm Modeling (Wanner et al., 2006).

Aquifas+ can be applied as a plant CONTROLLER and OPTIMIZER that runs in conjunction processes, such as those for membranes or denit filters. It can be run at a process or whole plant level.

IViewOps can run with each specific equipment such as tanks and pumps, each specific hydraulic configuration based on tanks, pipes, pumps and valves in or out of service within each process in the plant. This helps understand how availability of assets affect operations. It can be run at the whole plant level to optimize operations across the primary, secondary, tertiary and solids handling systems; identify strategies to simultaneously improve operations and maintenance.

The applications and models can be used by themselves or in conjunction with other simulators to improve the accuracy of their designs. If a plant is using IViewOps for operations, the engineer can use the setup at the plant which is calibrated to the plant and replicates the asset and hydraulic network to find better ways to upgrade the plant. The design will have a much greater accuracy and reliability.    

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