IMPACT OF LID FACILITIES ON SEWERAGE NETWORK OVERLOAD IN HIGHLY URBANISED AREAS

2020 ◽  
Author(s):  
Jaroslav Hrudka ◽  
Stefan Stanko ◽  
Reka Wittmanova ◽  
Gergely Rozsa
Keyword(s):  
Network Overload ◽  
Sewerage Network

Solids Concentrations in a Treatment Plant Effluent

1992 ◽  
Vol 26 (9-11) ◽  
pp. 2543-2546
Author(s):  
M. Defrain ◽  
F. Schmidt
Keyword(s):  
Waste Water ◽  
Activated Sludge ◽  
Federal Republic ◽  
Treatment Plant ◽  
Analysis Procedure ◽  
Process Water ◽  
Federal Republic Of Germany ◽  
Output Variable ◽  
Sludge Treatment ◽  
Sewerage Network

In the calculations customarily used to dimension nitrification and denitrification plants in the Federal Republic of Germany, solids in the influent of the biological stage represent a significant output variable. Numerous modified methods based on nationally and internationally standardized analysis procedures are available to determine solids concentrations in waste-water. Tests showed that different values are measured depending on the method of analysis employed. Harmonization of the analysis procedure is advisable to ensure comparable conditions for the calculation of activated sludge tank volumes. The solids reaching a treatment plant originate from two main sources. Filterable materials are passed to the treatment plant via the preceding sewerage network with its industrial and commercial users, but are also carried by process water from sludge treatment. The influence of process water on wastewater composition is illustrated by reference to the Wuppertal-Buchenhofen treatment plant.

Coordination Between the Operation of the Sewerage Network and the Wastewater Treatment Plant: Demonstration of Different Strategies in Halmstad, Sweden

1993 ◽  
Vol 27 (12) ◽  
pp. 177-181
Author(s):  
Claes Hernebring ◽  
Jan Falk
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
The City ◽  
Sewerage Network

The strategies developed by the city of Halmstad, Sweden, to improve coordination between the operation of the sewerage network and the wastewater treatment plant are outlined

scholarly journals Treatment of Wastewater Containing Runway De-Icing Agents in Biofilters as a Part of Airport Environment Management System

2020 ◽  
Vol 12 (9) ◽  
pp. 3608
Author(s):  
Joanna Rodziewicz ◽  
Artur Mielcarek ◽  
Wojciech Janczukowicz ◽  
Kamil Bryszewski ◽  
Kamila Ostrowska
Keyword(s):  
Organic Compounds ◽  
Natural Waters ◽  
Treated Wastewater ◽  
Water Runoff ◽  
Simultaneous Application ◽  
Carbon And Nitrogen ◽  
Storm Water Runoff ◽  
Carbon Compounds ◽  
Airport Runway ◽  
Sewerage Network

Large volumes of pavement de-icing and anti-icing fluids, collectively termed de-icing agents, are used at airports to facilitate wintertime safe air travel. After use, most of the them get typically mixed with storm water runoff and may enter soil and waters near the airports. Wastewater resulting from airports’ winter operations is contaminated mainly with nitrogen and carbon compounds. Previous research results have shown that the use of biofilters filled with lightweight aggregates prepared from fly ash from sewage sludge thermal treatment (FASST LWA) could be an effective method for removing nitrogen and organic compounds at low temperatures, i.e., 0–8 °C. For this to be possible, it is necessary to maintain a proper ratio between the amounts of carbon and nitrogen in the treated wastewater, through the simultaneous application of de-icing agents containing urea and carbon compounds. Biofilter technology is part of the concept of sustainable development. Their filling is made of waste materials and one of the pollutants (organic compounds) present in the wastewater is used to remove other pollutants (nitrogen compounds). In this study, technological systems for the treatment of wastewater containing airport runway de-icing agents with biofilters were proposed, which allow for the treated wastewater to be discharged into natural waters, soil, and sewerage network.

scholarly journals Fuzzy ranking based non-dominated sorting genetic algorithm-II for network overload alleviation

2014 ◽  
Vol 63 (3) ◽  
pp. 367-384 ◽  
Author(s):  
K. Pandiarajan ◽  
C.K. Babulal
Keyword(s):  
Genetic Algorithm ◽  
Power Systems ◽  
Optimization Problem ◽  
Pareto Optimal ◽  
Contingency Analysis ◽  
Nsga Ii ◽  
Generation Cost ◽  
Fuzzy Ranking ◽  
Network Overload ◽  
Line Overload

Abstract This paper presents an effective method of network overload management in power systems. The three competing objectives 1) generation cost 2) transmission line overload and 3) real power loss are optimized to provide pareto-optimal solutions. A fuzzy ranking based non-dominated sorting genetic algorithm-II (NSGA-II) is used to solve this complex nonlinear optimization problem. The minimization of competing objectives is done by generation rescheduling. Fuzzy ranking method is employed to extract the best compromise solution out of the available non-dominated solutions depending upon its highest rank. N-1 contingency analysis is carried out to identify the most severe lines and those lines are selected for outage. The effectiveness of the proposed approach is demonstrated for different contingency cases in IEEE 30 and IEEE 118 bus systems with smooth cost functions and their results are compared with other single objective evolutionary algorithms like Particle swarm optimization (PSO) and Differential evolution (DE). Simulation results show the effectiveness of the proposed approach to generate well distributed pareto-optimal non-dominated solutions of multi-objective problem

A Study on Variations in Sewerage Construction Projects

2012 ◽  
Author(s):  
Mohd Azraai Kassim ◽  
Jen Loong Lee
Keyword(s):  
Construction Industry ◽  
Construction Projects ◽  
Site Conditions ◽  
Project Costs ◽  
Research Findings ◽  
Project Characteristics ◽  
Major Factors ◽  
A Company ◽  
Total Project ◽  
Sewerage Network

Perubahan dalam pembinaan telah lama menjadi isu pertikaian antara pelbagai pihak yang terlibat dalam projek pembinaan. Namun, hanya sejumlah kecil kajian yang rasmi telah dijalankan untuk menganalisis sebab-sebab dan kesan-kesannya. Kajian ini tertumpu kepada analisis kekerapan dan keterukan berbagai-bagai faktor yang mengakibatkan perubahan dalam projek pembinaan rangkaian pembetungan. Adalah penting bagi sesebuah syrikat bukan sahaja mengetahui kos perubahan, tetapi juga mengenal pasti perkara-perkara yang perlu diberi perhatian untuk mengurangkan kos-kos sedemikian dalam projek akan datang. Kesemua data dan maklumat yang diperlukan diperolehi dari fail-fail arkib bagi tiga belas projek yang disahkan melalui temubual. Data-data dikategori untuk menganalisis kekerapan dan keterukan faktor-faktor. Jadual dan carta digunakan untuk menunjukkan hasil-hasil kajian. Daripada hasil analisis, keadaan tapak yang berbeza merupakan faktor utama yang mengakibatkan perubahan. Faktor-faktor ini menyumbangkan 49.3% daripada jumlah bilangan perubahan, 56.2% daripada jumlah kos perubahan dan 3.8% daripada jumlah kos projek. Dua ciri projek, iaitu nilai anugerah kontrak dan gred pendaftaran kontraktor dengan Lembaga Pembangunan Industri Pembinaan (mewakili pengkhususan, kedudukan kewangan dan sumber-sumber lain kontraktor) menunjukkan penyebab yang tertentu dengan perubahan. Kata kunci: perubahan; kekerapan; keterukan; pembetungan; rangkaian; pengkhususan Variations in construction have long been a debatable issue among the different participants involved in construction projects. However, only a few formal studies have been carried out to analyse its couses and effects. This study is focused on the frequency and severity of various factors causing variations in sewerage networks construction projects. It is important for a company not only to know the variation costs, but also to identify the most likely areas on which to focus in order to reduce these costs for the future projects. All the necessary data and information are obtained from archival files of thirteen projects and verified through interviews. These data are categorised to analyse the frequency and severity of factors. Tables and charts are presented to show the research findings. From the analysis, differing site conditions appear to be the major factors contributing to variations. They average 49.3% of the total number of variations, 56.2% of the total variation costs and 3.8% of the total project costs. Two project characteristics i.e. contract award value and the contractor´s registration grade with the Construction Industry Development Board (which represents the contractor´s specialisation, financial and other resources standing) show certain causal relationships with variations. Key words: variation; frequency; severity; sewerage; network; specialisation

scholarly journals Variable dynamics of sewage supply to wastewater treatment plant depending on the amount of precipitation water inflowing to sewerage network

2017 ◽  
Vol 33 (1) ◽  
pp. 57-63 ◽  
Author(s):  
Piotr M. Bugajski ◽  
Grzegorz Kaczor ◽  
Krzysztof Chmielowski
Keyword(s):  
Wastewater Treatment ◽  
Water Supply ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Sewerage System ◽  
Sewage System ◽  
Treated Sewage ◽  
Precipitation Water ◽  
Sewerage Network ◽  
Maximum Design

AbstractThe paper analyzes the effect of precipitation water that inflowing to sanitary sewage system as accidental water on the changes in the total amount of treated sewage. The effects of accidental water supply on the total amount of sewage inflowing to treatment plant were analyzed based on mean daily amounts from the investigated periods and mean daily amounts from incidental supplies. The study was conducted in the years 2010–2015. Six characteristic research periods were identified (one per each calendar year), when the amount of sewage in the sanitary sewage system was greater than during dry weather. The analysis of changes in the amount of sewage supplied to the sewerage system in the six investigated periods revealed that the accidental water constituted from 26.8% to 48.4% of total sewage inflowing to the wastewater treatment plant (WWTP). In exceptional situations, during intense rains, the share of precipitation water in the sewerage system would increase up to 75%. Then, the rainwater inflowing the sewerage system caused hydraulic overloading of the WWTP by exceeding its maximum design supply.

scholarly journals Identificación de tipologías de asentamiento para el diseño de tratamiento descentralizado de aguas residuales. Caso de estudio: San Isidro de Heredia - Costa Rica

2016 ◽  
Vol 1 (56) ◽  
pp. 183
Author(s):  
Daniel Francisco Avendaño-Leadem
Keyword(s):  
Treatment Options ◽  
Public Works ◽  
The Public ◽  
Decentralized Wastewater Treatment ◽  
Decentralized Treatment ◽  
San Rafael ◽  
Treatment Alternatives ◽  
Sewerage Network ◽  
Centralized System ◽  
Selection Of

El proyecto de Saneamiento Ambiental de la Empresa de Servicios Públicos de Heredia tiene como objetivo tratar las aguas residuales que se generan en los cantones de Heredia, San Rafael y San Isidro de forma centralizada, sin embargo se ha topado con el problema de que ciertos asentamientos del cantón de San Isidro no podrán ser conectados directamente a la nueva red de alcantarillado sanitario. Partiendo de la eficiencia y la adaptabilidad de las diferentes alternativas de tratamiento, la presente investigación propone sistemas descentralizadas de tratamiento de aguas residuales para los asentamientos que lo requieran. La metodología contempla las variables de densidad y crecimiento poblacional, zonificación de uso del suelo, disponibilidad de espacio y cercanía a un cuerpo de agua. ABSTRACT The Environmental Sanitation Project of the Public Works Company of Heredia (ESPH, for its name in Spanish) aims at treating the wastewater being generated in the municipalities of Heredia, San Rafael and San Isidro in a centralized system. However, it has faced the problem that certain settlements in San Isidro cannot be connected directly to the proposed sewerage network. Based on the efficiency and adaptability of the different treatment alternatives, this research proposes decentralized wastewater treatment systems for the settlements that require them. The methodology considers the variables of population growth and density, land use zoning, spatial availability and closeness to a waterbody in order to classify the settlements into four archetypal typologies sharing similar conditions to facilitate the selection of decentralized treatment options for each settlement.

scholarly journals SARS-CoV-2 adsorption on suspended solids along a sewerage network: mathematical model formulation, sensitivity analysis, and parametric study

2021 ◽  
Author(s):  
Margaritis Kostoglou ◽  
Maria Petala ◽  
Thodoris Karapantsios ◽  
Chrysostomos Dovas ◽  
Emmanuel Roilides ◽  
...  
Keyword(s):  
Sensitivity Analysis ◽  
Spatial Distribution ◽  
Treatment Plant ◽  
Piping System ◽  
Model Formulation ◽  
Virus Shedding ◽  
Continuous Approach ◽  
Single Pipe ◽  
Sewerage Network

AbstractAccounting for SARS-CoV-2 adsorption on solids suspended in wastewater is a necessary step towards the reliable estimation of virus shedding rate in a sewerage system, based on measurements performed at a terminal collection station, i.e., at the entrance of a wastewater treatment plant. This concept is extended herein to include several measurement stations across a city to enable the estimation of spatial distribution of virus shedding rate. This study presents a pioneer general model describing the most relevant physicochemical phenomena with a special effort to reduce the complicated algebra. This is performed both in the topology regime, introducing a discrete-continuous approach, and in the domain of independent variables, introducing a monodisperse moment method to reduce the dimensionality of the resulting population balance equations. The resulting simplified model consists of a large system of ordinary differential equations. A sensitivity analysis is performed with respect to some key parameters for a single pipe topology. Specific numerical techniques are employed for the integration of the model. Finally, a parametric case study for an indicative—yet realistic—sewerage piping system is performed to show how the model is applied to SARS-CoV-2 adsorption on wastewater solids in the presence of other competing species. This is the first model of this kind appearing in scientific literature and a first step towards setting up an inverse problem to assess the spatial distribution of virus shedding rate based on its concentration in wastewater.

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