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UDC 628.3:62-192
Karmazinov F. V., PANKOVA G. A., Mikhailov D. M., IGNATCHIK V. S., Ignatchik S. Iu., Kuznetsova N. V.
Method of evaluating the amount of emergency wastewater discharges into the environment
Summary
The method of evaluating the amounts of emergency discharges of wastewater into the environment caused by the overrun of wastewater inflow over the capacity of the sewage pumping stations resulted from the emergency shutdown of pumps or inflow of off-nominal wastewater flow is presented. The results of studying failure and restoration flows of the pumping equipment in the combined sewers are presented together with the algorithms of reliability assessment by analytical method and Monte-Carlo simulation method. The use of the developed method of evaluating the amounts of emergency discharges of wastewater into the environment provides for substantiating the solutions at the stage of project documentation development that meet the requirements of the legislative and regulatory documents in the field of water supply, wastewater disposal and environmental protection. The indicators of reliability and environmental safety (probability of flooding of the sewers transporting wastewater to the pumping stations when wastewater is discharged into the environment) variate not only depending on the failure-free performance and maintainability indicators but also depending on the state of the sewage pumping station during the initial period of operation. For this reason one of the ways of improving these indicators at sewage pumping stations is timely execution capital and regular repairs of pumps.
Key words
wastewater , sewerage pumping station , reliability indices , parameters of failure flows , analytical method of reliability assessment , simulation method , density function
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UDC 628.21.62-192
GALPERIN E. M., Strelkov A. K.
The reliability of municipal sewers
Summary
The aspects of the reliability of municipal sewers are considered. The reliable transportation of raw wastewater to the treatment facilities is extremely important for the normal town-living. At present there is no authorized quantitative index of sewer reliability. Municipal sewer is a comprehensive technical system and the reliability indices shall be designated as appropriate. The use of the mathematical model of such facilities provides for determining the complex of the sewer reliability indices. The factors that affect the sewer reliability are analyzed; specific measures of its improvement are suggested.
Key words
Failure , collector , mathematical model , clogging , reliability indices , sewer
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UDC 628.1/.3.196
GALPERIN E. M., Strelkov A. K.
On the reliability of water supply and wastewater collection systems
Summary
Integrity of operation is the most important attribute of the water distribution and wastewater collection networks. However up to now the regulatory documents lack the definition of this notion. By the case studies of the water distribution network operation the great losses that the national economy incurs due to the lack of the integrity indicators in the construction rules and regulations have been demonstrated. It is noted that introducing these indicators will provide for the significant improvements in the design methods and evaluation of the operation of water and wastewater systems. A considerable number of the experts are not ready to change the conventional working arrangements ignoring the Order of the RF Ministry of Regional Development that offers the indicators that take into account the reliability of operation. The RF Ministry of Housing and Public Utilities must display insistence and perseverance in adopting a firm technical policy in relation to this issue.
Key words
efficiency , reliability indices , integrity of operation , regulatory documents , terms and definitions , regeneration processes in wastewater disposal , redundancy types
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UDC 628.152
GALPERIN E. M., Bukhman N. S.
Calculation of loop network reliability
Summary
The reliability of loop water distribution network operation has been its primary property. However, until now the regulatory documents for designing water distribution networks lack the reliability indices. There is no consensus among the experts related to these indices. Earlier proposed set of reliability indices of a loop water network is considered and one of the possible methods of their calculation is suggested. The data on the time of the water mains 325.78 km long operating in serviceable and unserviceable conditions is set by the example of the Samara municipal water network (the data for 2014). For the theoretical determination of the time of the water mains being in serviceable and unserviceable conditions Markovian model was used with discrete states and continuous time. To decrease the dimensionality of the current task all the states with equal number of isolated sections were curtailed into one state (subset). The feasibility of this solution was prompted by the practice of water network operation. The model verification by Pearson’s Chi-square criterion allows accepting the hypothesis of the theoretical results corresponding to the available experimental data.
Key words
hydraulic design , reliability indices , loop water distribution network , Chi-square (Pearson’s) , Markovian model with discrete states and continuous time
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UDC 628.292.65.011.4
Ignatchik S. Iu.
Energy conservation and reliability assurance in upgrading sewage pumping stations
Summary
The main principles of reliability and energy conservation calculation method for designing the upgrade of local sewage pumping stations that are transferring wastewater to the treatment facilities are presented. When preparing a feasibility study of the project design the technology and probability indices of reliability for each element of the process part of the pumping station together with probabilistic and individual dimension reliability are determined. The option of upgrading the process part is selected with account of the environmental requirements and investment efficiency of the project.
Key words
wastewater , power saving , operation expenditures , pumping station , calculated hydraulic model , net discounted expense , reliability indices
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