Optimization of wastewater pumping station operation

Summary

The operation of wastewater pumping stations requires attention and understanding of the life cycle of the facilities and equipment. As a rule, the facilities put into operation and designed for the calculated amount of wastewater for a long time cannot reach the rated capacity. This is due to more efficient drinking water consumption by the population, low rate of housing development and sale on the territories served by the wastewater pumping stations, reduction and even termination of wastewater discharge by the industrial enterprises. The method of studying the operation of the wastewater pumping stations, selecting the optimal parameters of the home-made pumping units is presented. The implementation of the optimized work schedule for three units with a rated capacity of 1400, 350 and 320 m³/h provided for reducing the number of turns-on of the pumping units and 23% energy saving. At the same time the changes in the work schedule of the downstream transfer wastewater pumping station and 10–12% reduction in the power consumption were registered. The actual cost payback period was less than one year.

Key words

wastewater , sewerage pumping station , power consumption , economic efficiency , method of studying

Specific features of inspecting and innovative methods of protecting sewer tunnels in operation for a long time in unstable soils under increasing technogenic impact

Summary

An important factor in ensuring the technospheric safety associated with the increasing technogenic impact with the intensive development of megalopolises is the stability of the operation of urban underground engineering infrastructure utilities. Sewer tunnels that have been in operation for a long time in unstable soils, need special protection from man-made impacts. On the basis of the study of pilot and experimental materials, the features of the operation of deep sewer tunnels under conditions of soft soils and intense technogenic impacts are analyzed. New methods of diagnostics, defect symptoms and the results of modeling the combined action of systems «sewer tunnel – enclosing geoarray», as well as the experimental data at pilot facilities are presented. Geotechnological methods have been developed to protect long-term operating sewer tunnels. A unique experience of applying the developed methods at the facilities of St. Petersburg with monitoring support is presented. The proposed special methods for assessing the integrity health, the geomonitoring system and geotechnical methods for protecting sewer tunnel structures including the technologies for structural reinforcement and rehabilitation in conditions of wastewater transportation, provide for improving the bearing capacity of structures and their operational reliability in difficult soil conditions under increasing technogenic impact.

Keywords

monitoring , method of studying , man-induced impact , sewer tunnel structures , severe engineering-geological environment , geotechnical protection measures