In Poland, the city of Tomaszów Mazowiecki had an ageing wastewater plant that was built in the early 1970s. It required too much maintenance, consumed too much energy and by the year 2000 it had trouble continuously keeping its effluent numbers low enough. "It was technologically obsolete," says to Waldemar Debowski, the municipal plant's manager since 1993. "The aerators consumed a lot of energy and produced little oxygen. They accounted for 80% of our energy consumption. It wasn't an ideal solution.
"The city received EU funding to rebuild its plant, and by 2013 the design and construction for a new chemical and biological treatment plant were underway. The requirement for shallow (3.9 metre-deep) tanks provided a challenge in designing and building an energy-efficient aeration and mixing system. Early in the process, supplied were Grundfos pumps, dosing equipment and boosters, plus all the equipment for the bioreactors, including aeration grids, mixers and blowers. Grundfos also headed up the bioreactors' design, sub-supply and assembly. Successfully designed by Grundfos, the bioreactors are the most critical part of the plant, and it's where the nitrogen and phosphorus are removed.
It is now one of the few biological treatment plants in Poland that can lower the nitrogen level to 4-5 mg/l at the outflow and the phosphorus level to 0.4 mg/l. Plant manager Waldemar Debowski says the modernisation of blowers and aeration system alone has resulted in much lower energy consumption as well as the better parameters on treated water. After they implemented the solutions suggested by Grundfos, the wastewater plants energy consumption has dropped by 50%.
The treated outflow from the municipal plant goes into the Pilica River - one of the longest tributaries of the Vistula River in Poland. It flows some 800 metres away from the plant through a nature reserve. The parameters of the treated effluent are now better than the parameters of the river water.
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