Experience in the reconstruction of the wastewater treatment facilities operated by MUE Teplovodokanal of Pushchino

Summary

In the early 1990s, after the introduction of new regulations for the quality of effluent, as well as due to a significant reduction in the available funding for water supply and wastewater disposal facilities, a tendency arose of a widespread violation of the requirements to the quality of wastewater treatment in the context of the impossibility of improving the situation. With the resumption of the economic growth at the beginning of the 21^st century, Russia began to allocate public funds for the reconstruction of large-scale treatment facilities in order to provide for the required level of wastewater treatment by way of retrofitting advanced technologies. The access to financing for the reconstruction of wastewater treatment facilities is possible on the condition that the full-fledged project documentation that has passed the state expert appraisal is available. The experience of reconstructing small-scale wastewater treatment facilities in Pushchino that failed to be included into any budget financing program, is described. With the support and recommendations of relevant organizations and specialists, a list of measures was compiled for the stage-by-stage improvement of the wastewater treatment technology, taking into account the available funding. One of the first stages while implementing the measures was the introduction of the advanced technology for the biological removal of nutrients with the allocation of anaerobic and anoxic zones in traditional aeration tanks with mechanical activated sludge mixing. Russian-made vertical hyperbolic mixers were chosen as mixing devices. After the reconstruction of the first block of aeration tanks combined with the installation of mixers directly by the equipment supplier, the first positive results were obtained, i. e., the achieved indicators for organic substances and nitrogen group compounds were better than the required ones.

Key words

energy efficiency , sewerage treatment facilities , wastewater biological treatment , best available techniques (BAT) , hyperbolic mixer