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Restoration and Renovation of Waste Water Pumping Stations in Case of Emergency

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Restoration and Renovation of Waste Water Pumping Stations in Case of Emergency Available online at www.sciencedirect.com ScienceDirect Procedia Engineering 165 ( 2016 ) 1087 – 1091 15th International scientific conference “Underground Urbanisation as a Prerequisite for Sustainable Development” Restoration and renovation of waste water pumping stations in case of emergency Nikolay Makishaa,* aMoscow state university of civil engineering, Yaroslavskoye sh. 26, Moscow, 129337, Russia Abstract The article reveals issues of reconstruction and upgrading of pumping stations in case of emergency. The main problems to be faced with are lack of capacity, equipment wear and low treatment quality. The article focuses on methods and technologies how to perform reconstruction of pumping stations, which aimed at efficiency rise for the existing pumping stations and reduction of their reconstruction cost. Averaging of inflow in tanks combined with pumping stations is a matter of a significant interest that allows reducing of flow irregularity and furthermore rising of treatment quality on waste water treatment plants. © 20162016 The The Authors. Authors. Published Published by Elsevierby Elsevier Ltd. LtdThis. is an open access article under the CC BY-NC-ND license Peer(http://creativecommons.org/licenses/by-nc-nd/4.0/-review under responsibility of the scientific). committee of the 15th International scientific conference “Underground UrbPeer-reviewanisation under as a responsibility Prerequisite offor the Sustainable scientific committee Development of the. 15th International scientific conference “Underground Urbanisation as a Prerequisite for Sustainable Development Keywords: waste water, anaerobic treatment, biogas, methane Nomenclature WWTP waste water treatment plant Kgen general coefficient of inflow irregularity before the averaging Kreg coefficient of flow irregularity after the averaging Qmid average flow Wreg volume of averaging tank * Corresponding author. Tel.: +7-903-660-23-04; fax: +7-499-929-50-14 E-mail address: [email protected], [email protected] 1877-7058 © 2016 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer-review under responsibility of the scientific committee of the 15th International scientific conference “Underground Urbanisation as a Prerequisite for Sustainable Development doi: 10.1016/j.proeng.2016.11.823 1088 Nikolay Makisha / Procedia Engineering 165 ( 2016 ) 1087 – 1091 τreg time of averaging in averaging tank 1. Introduction Waste water pumping stations is a complex of facilities and equipment that provides sewage transportation either to WWTP or to further going gravity pipelines. If the whole sewage system is meant pumping stations have a higher dependence to any malfunction comparing with other facilities. Moreover, breakdown of pumping station operation may cause failure of the whole sewage system. [1] Type of pumping stations may be defined according to depth of inlet pipeline, type and amount of incoming waste water, hydrogeological conditions and type of pumping equipment. [2] 2. What can be done A majority of pumping stations of sewage systems in Russia were built and launched in 70s in the time of large scope dwelling construction throughout the country. Meanwhile only few of them may correspond current requirements for these facilities, the rest are totally outdated and need radical reconstruction and upgrade. [2,3] The simplest and easiest way to perform the reconstruction of pumping stations is to implement an obvious solution – replacement of existing pumps to equipment that has higher capacity and functionality. [4] However, that sort of reconstruction is not the only task to be faced if pumping station are considered. Reconstruction or restoration of pumping stations that were exposed to emergency situations that might happen has a special significance. Figures 1 and 2 show consequences of emergency situation that happened on the pumping station in the town of Domodedovo (Moscow region, Russia) due to low-quality construction works in the above and underground part of pumping station. Fig. 1. Aboveground part of pumping station after emergency situation. There were several engineering solutions and measures applied that allowed to restore the constructions and technology of sewage transportation and to relaunch pumping station in operation within possible shortest period of time. A specific configuration was applied (fig.3) according to which a receiving tank and pump room were separated from rooms of domestic and industrial purposes. There were also screens with small aperture (fig.4) installed that is not typical for pumping station. The waste of these screens is transported on a press and further to a facility of waste recycling. The rooms for staff and automation equipment were protected from emergency situation thus the risk of possible failure of pumping station was significantly reduced. [5] Nikolay Makisha / Procedia Engineering 165 ( 2016 ) 1087 – 1091 1089 Fig. 2. Underground part of pumping station after the emergency situation. Fig. 3. Pressure pipelines room after the restoration. Fig. 4. Screens with small aperture after the reconstruction. 1090 Nikolay Makisha / Procedia Engineering 165 ( 2016 ) 1087 – 1091 3. Flow regulation Regulation of flow that is transported by means of pumping station to WWTP is the method of a significant interest that allows to reduce irregularity of incoming waste water. Construction of regulated sewage system is an ideal case which is aimed to provide an equal waste water flow during the day without rises or falls. Calculation of averaging tanks can be made basing on optimal value of regulated flow of waste water which in turn chosen by means of consecutive selection of irregularity coefficient values according to the following ratios: K reg J reg (1) K gen Wreg Wreg (2) Qmid Value of τreg can be defined according to the following ratio: 2 Wreg 29.991uJ reg 60.97uJ reg 31.044 (3) The ratio between Jreg and Wreg is shown in table 1. Table 1. Jreg 1 0.95 0.9 0.85 0.8 0.75 0.67 0.65 Wreg 0 0.24 0.5 0.9 1.5 2.15 3.3 4.4 As soon as the coefficient selected it becomes possible to calculate volumes respectively of averaging tanks and tanks where the biological treatment will be performed. Volume of averaging tank can be defined as follows: Wreg Qmid uWreg (4) Fig. 5. Averaging tanks on WWTP. There were a lot of WWTP built in 1950s’ which were later taken out of service. Until now some of these tanks still out of use. In many cases volume of these tanks and their close location to pumping station affords using them as averaging tanks. [5] Nikolay Makisha / Procedia Engineering 165 ( 2016 ) 1087 – 1091 1091 Reequipment of sedimentation tanks into averaging tanks (fig.5) at WWTP of Krasnoznamensk (Moscow region, Russia) for instance helped to reduce the flow irregularity and concentration of suspended solids for 30-40%. As this solution showed its effect it was repeated in the town of Shatura, Lytkarino (both Moscow region, Russia) and some others. 4. Conclusions 1. Emergency situation at pumping station can result in failure of operation of the entire sewage system 2. Reconstruction of pumping station is a multi-optional tasks which means not only change of the equipment but also change of scheme how the it works in general and averaging of sewage flow in particular References [1] V. Scherbakov, E. Gogina, T. Schukina, N. Kuznetsova, N. Makisha, E. Poupyrev, Calculation of biogas facilities for recycling of organic sewage sludge of breeding factories, International Journal of Applied Engineering Research. 10(24) (2015) 44353-44356. [2] E. Gogina, N. Makisha, Information technologies in view of complex solution of waste water problems, Applied Mechanics and Materials. 587-589 (2014) 636-639. [3] N. Zaletova, Y. Voronov, N. Makisha, Conditions of advanced removal of phosphorus at wastewater treatment plants, International Journal of Applied Engineering Research. 10(21) (2015) 42454-42455. [4] N. Makisha, V. Scherbakov, A. Smirnov, E. Scherbina, Percolation units for waste water treatment. International, Journal of Applied Engineering Research. 10(24) (2015) 44347-44349. [5] N. Makisha, Y.Voronov, E. Poupyrev, V. Volshanik, Laboratory research of zeolite use for treatment of waste water of different origin, International Journal of Applied Engineering Research. 10(21) (2015) 41919-41922. [6] A.A. Kulakov, E.A. Lebedeva, Development of Engineering Solutions concerning Modernization of Wastewater Treatment Facilities Based on Technology Simulation, Water Treatment. 12 (2011) 10-19. [7] E. Gogina, N. Makisha, Information technologies in view of complex solution of waste water problems, Applied Mechanics and Materials. 587-589 (2014) 636-639. [8] N. Makisha, O. Yantsen, Laboratory modeling and research of waste water treatment processes in biofilters with polymer feed, Applied Mechanics and Materials. 587-589 (2014) 640-643. [9] N. Makisha, E. Gogina, Methods of biological removal of nitrogen from waste water and ways to its intensification, Applied Mechanics and Materials. 587-589 (2014) 644-647. [10] O.A. Ruzhitskaya, E.S. Gogina, Intensifying the processes of wastewater purification from phosphates and organic impurities, Advanced Materials Research. 919-921 (2014) 2141-2144. [11] E. Gogina, I. Gulshin. The single-sludge denitri-nitrification system in reconstruction of wastewater treatment plants in the Russian Federation. Applied Mechanics and Materials. 580 (2014) 2367-2369. [12] E. Gogina, O. Ruzhitskaya, One-sludge denitri-nitrification
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