Summary

Today, the vast majority of wastewater treatment plants in Hungary operate above the dimensioning state both hydraulically and in terms of organic matter content. The outdated control of the transfer pumps does not allow for the use of systematic scaling control to adapt to new demands. In order to reduce the organic matter content, new bacteria have been created, which require a rethink of the regulation of our system for it to function effectively. Using mathematical system theory and networking as a bioreactor, our goal is to reduce the opreation of the colonies back to the dimensioning state or, if our system allows, to reduce it below.

Computer control of wastewater pumping stations is nowadays almost commonplace. Each shaft communicates with a central server. In contrast, the target functions and transmission functions used to control them are not suffiecently diverse to control the system at its optimum and treating as a system. Our goal is to develop a new control system that can make the control of sewage pumping systems systematic.

To do this, we need to use mathematical system theory, including Bellman's dynamic programming. This method enables system-wide operation because it treats the network as a coherent graph in which each point is dependent on the other. This way you can create a control that can optimize the whole system by specifying one or two input parameters. Thus, unlike before, we will not control the lifter individually, but will actually control the as a system, thus achieving the desired optimum value.

The above mathematical procedure is well applicable as a basis for computer software. The algorithms created provide the basis for the creation of a control system, which enabled the operation to be executed as imagined and implemented with the control technology used today.

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Publication

„Intensification of Dabas Wastewater Treatment Plant” R+D project (PIAC-13-1-2013-0030) – Project description

The main purpose of the R+D project „Intensification of Dabas Wastewater Treatment Plant” R+D project (PIAC-13-1-2013-0030) was to find and develop new, innovative methods for the operation of the sewage system (and the wastewater treatment facility), in order to reduce the periodically occurring hydraulic and organic material overload of the treatment plant.

The goals of the project were to find the most suitable ways to reduce the daily hydraulic load peaks (to even out the inflow rate of the wastewater arriving at the wastewater treatment plant), and to examine the pre-treatment possibilities inside the sewage network.

The novelty of the project was the new graph theory-based system approach of the operation of the sewerage network, and the development of the bioaugmentation methodology within the sewerage network (bacterial compositions propagated from a stack solution, and added into the sewage).

The aim of the hydraulic load peak reduction could be achieved by developing the systemic control program of the pumps, and the pre-treatment could be accomplished by bioaugmentation, namely a proper dosage of a bacterial additive (bacterial culture and / or enzymes) fed into the sewage system. Therefore the sewage network can be used as a bioreactor.

In order to reduce peaks of the wastewater flow (hydraulic load) following the comprehensive review of the sewage network, the old equipment was replaced and new sump pumps were installed along the network. With the coordination of the operation of the pumps, the fluctuation of the hydraulic loads can be smoothened. However, it has also required a special control program matching to the features of the network and to the local customs of the municipal water usage. Therefore, based on the examinations of the project and the graph-theory model a new, unique algorithm was made, which can operate the network in order to optimize and control the load and storage capacity.

In order to optimize the operation of the wastewater treatment plant we constructed the mathematical model of the units using a computer simulation program. The simulation results allow us to examine the changes in operation caused by the optimization.

Different compositions of bioaugmentation products, selected on the basis of efficiency, were examined under laboratory conditions to select the most suitable formulations and doses for the reduction of organic matter in the incoming wastewater. Subsequently, further experiments were carried out with the bioaugmentation products in a pilot plant scale bioreactor. In order to make the bacterial cultures adapt as much as possible to the wastewater of the treatment plant a new experimental bacterial culture was created. The activated sludge in the growth reactor (derived from the wastewater treatment plant) was inoculated by the mixture of commercially available bioaugmentation products used during the testing of the channel network, and the activity of the formed biomass was tested.

According to the results of the tests conducted with the breeding reactor, the biomass adapted to the incoming wastewater showed measurable activity in respect of organic material decomposition (cold wastewater and under-aerated conditions). In summary, it can be stated that it is possible to prepare a biomass under experimental conditions which can adapt to the wastewater collection network conditions, and is capable of effective degradation of organic matter.

Contacts

dakov

DAKÖV Dabas és Környéke Vízügyi Ltd.

Address: H-2370, Dabas, Széchenyi u. 3, Hungary
Phone: +36 29 360 323
E-mail: info@bioreaktor.hu

www.dakov.hu
www.bioreaktor.hu