The Experts below are selected from a list of 12156 Experts worldwide ranked by ideXlab platform

Siti Safirah Rashid - One of the best experts on this subject based on the ideXlab platform.

  • assessing environmental impacts of large centralized wastewater treatment plants with combined or separate Sewer Systems in dry wet seasons by using lca
    Environmental Science and Pollution Research, 2020
    Co-Authors: Siti Safirah Rashid, Yongqiang Liu
    Abstract:

    Rainfall can affect influent flow rate and compositions of wastewater, and thus further affect wastewater treatment performance and the effluent quality. This study aims to study the influence of rainfall on the environmental impacts of centralized wastewater treatment plants. The correlations between rainfall, and influent flow rate and compositions of wastewater in wet and dry seasons with two Sewer Systems, i.e. combined and separate Sewer Systems, were primarily established. Environmental impacts were assessed with life cycle assessment (LCA) to understand the temporal environmental burdens in wet and dry seasons. Functional units as per m3 treated wastewater (FU1) and as per kg PO43-eq. removed (FU2), respectively, were used to evaluate impacts of wastewater treatment to the environment. Strong correlation between rainfall and the influent flow rate was found in the wastewater treatment plants with either a combined Sewer system (with Pearson correlation coefficient r at 0.66) or a separate Sewer system (with r at 0.84), where r represents the strength of the association between two variables. The rainfall effect is more obvious on the eutrophication potential and global warming potential than on other environmental indicators while Sewer system, i.e. combined or separate, seems not important in the two cases studied. Both wastewater treatment plants (WWTPs) show a lower environmental burden in the wet season than in the dry season partially due to the dilution of wastewater by using FU1. The WWTP receiving high strength wastewater, however, demonstrates higher environmental impacts in the wet season by using FU2 than FU1, due to the less efficient treatment caused by heavy rainfall. Meanwhile, it is found that environmental impacts from the WWTP receiving low strength wastewater have no difference when using either FU1 or FU2. The results indicate that the environmental burdens particularly eutrophication and global warming caused by WWTPs are dependent on the correlations of rainfall intensity with wastewater quantity and quality instead of combined or separate Sewer system. This could be used to guide a stricter control of eutrophication in a more sensitive season in more vulnerable receiving waters.

  • Assessing environmental impacts of large centralized wastewater treatment plants with combined or separate Sewer Systems in dry/wet seasons by using LCA
    Environmental Science and Pollution Research, 2020
    Co-Authors: Siti Safirah Rashid
    Abstract:

    Rainfall can affect influent flow rate and compositions of wastewater, and thus further affect wastewater treatment performance and the effluent quality. This study aims to study the influence of rainfall on the environmental impacts of centralized wastewater treatment plants. The correlations between rainfall, and influent flow rate and compositions of wastewater in wet and dry seasons with two Sewer Systems, i.e. combined and separate Sewer Systems, were primarily established. Environmental impacts were assessed with life cycle assessment (LCA) to understand the temporal environmental burdens in wet and dry seasons. Functional units as per m^3 treated wastewater (FU1) and as per kg PO_4^3-eq. removed (FU2), respectively, were used to evaluate impacts of wastewater treatment to the environment. Strong correlation between rainfall and the influent flow rate was found in the wastewater treatment plants with either a combined Sewer system (with Pearson correlation coefficient r at 0.66) or a separate Sewer system (with r at 0.84), where r represents the strength of the association between two variables. The rainfall effect is more obvious on the eutrophication potential and global warming potential than on other environmental indicators while Sewer system, i.e. combined or separate, seems not important in the two cases studied. Both wastewater treatment plants (WWTPs) show a lower environmental burden in the wet season than in the dry season partially due to the dilution of wastewater by using FU1. The WWTP receiving high strength wastewater, however, demonstrates higher environmental impacts in the wet season by using FU2 than FU1, due to the less efficient treatment caused by heavy rainfall. Meanwhile, it is found that environmental impacts from the WWTP receiving low strength wastewater have no difference when using either FU1 or FU2. The results indicate that the environmental burdens particularly eutrophication and global warming caused by WWTPs are dependent on the correlations of rainfall intensity with wastewater quantity and quality instead of combined or separate Sewer system. This could be used to guide a stricter control of eutrophication in a more sensitive season in more vulnerable receiving waters.

Yongqiang Liu - One of the best experts on this subject based on the ideXlab platform.

  • assessing environmental impacts of large centralized wastewater treatment plants with combined or separate Sewer Systems in dry wet seasons by using lca
    Environmental Science and Pollution Research, 2020
    Co-Authors: Siti Safirah Rashid, Yongqiang Liu
    Abstract:

    Rainfall can affect influent flow rate and compositions of wastewater, and thus further affect wastewater treatment performance and the effluent quality. This study aims to study the influence of rainfall on the environmental impacts of centralized wastewater treatment plants. The correlations between rainfall, and influent flow rate and compositions of wastewater in wet and dry seasons with two Sewer Systems, i.e. combined and separate Sewer Systems, were primarily established. Environmental impacts were assessed with life cycle assessment (LCA) to understand the temporal environmental burdens in wet and dry seasons. Functional units as per m3 treated wastewater (FU1) and as per kg PO43-eq. removed (FU2), respectively, were used to evaluate impacts of wastewater treatment to the environment. Strong correlation between rainfall and the influent flow rate was found in the wastewater treatment plants with either a combined Sewer system (with Pearson correlation coefficient r at 0.66) or a separate Sewer system (with r at 0.84), where r represents the strength of the association between two variables. The rainfall effect is more obvious on the eutrophication potential and global warming potential than on other environmental indicators while Sewer system, i.e. combined or separate, seems not important in the two cases studied. Both wastewater treatment plants (WWTPs) show a lower environmental burden in the wet season than in the dry season partially due to the dilution of wastewater by using FU1. The WWTP receiving high strength wastewater, however, demonstrates higher environmental impacts in the wet season by using FU2 than FU1, due to the less efficient treatment caused by heavy rainfall. Meanwhile, it is found that environmental impacts from the WWTP receiving low strength wastewater have no difference when using either FU1 or FU2. The results indicate that the environmental burdens particularly eutrophication and global warming caused by WWTPs are dependent on the correlations of rainfall intensity with wastewater quantity and quality instead of combined or separate Sewer system. This could be used to guide a stricter control of eutrophication in a more sensitive season in more vulnerable receiving waters.

L. Corominas - One of the best experts on this subject based on the ideXlab platform.

  • Life cycle assessment of urban wastewater Systems: quantifying the relative contribution of Sewer Systems
    Water Research, 2015
    Co-Authors: E. Risch, O. Gutierrez, P. Roux, C. Boutin, L. Corominas
    Abstract:

    This study aims to propose a holistic, life cycle assessment (LCA) of urban wastewater Systems (UWS) based on a comprehensive inventory including detailed construction and operation of Sewer Systems and wastewater treatment plants (WWTPs). For the first time, the inventory of Sewers infrastructure construction includes piping materials and aggregates, manholes, connections, civil works and road rehabilitation. The operation stage comprises energy consumption in pumping stations together with air emissions of methane and hydrogen sulphide, and water emissions from Sewer leaks. Using a real case study, this LCA aims to quantify the contributions of Sewer Systems to the total environmental impacts of the UWS. The results show that the construction of Sewer infrastructures has an environmental impact (on half of the 18 studied impact categories) larger than both the construction and operation of the WWTP. This study highlights the importance of including the construction and operation of Sewer Systems in the environmental assessment of centralised versus decentralised options for UWS.

Gürkan Sin - One of the best experts on this subject based on the ideXlab platform.

  • controlling Sewer Systems a critical review based on Systems in three eu cities
    Urban Water Journal, 2017
    Co-Authors: Ane Loft Mollerup, Peter Steen Mikkelsen, Dines Thornberg, Gürkan Sin
    Abstract:

    AbstractThe term Real Time Control (RTC) is widely used to describe all types of control Systems in Sewer Systems. Today the term covers everything from the simplest to the most advanced types of control Systems, making it difficult to communicate about Sewer system control in a precise manner, as well as search and find specific types of control Systems for comparison. Through a survey of implemented control Systems in three EU cities today and with the perspectives of current research within the field of Sewer system control, the needs for a new control system design framework is identified. With the basis of existing frameworks for control system design, a new time-scale dependent framework is proposed. We believe this comprehensive time-scale dependent framework can help water utilities to retrofit and design new control solutions and facilitate knowledge sharing about existing designs.

  • a generic methodology for the optimisation of Sewer Systems using stochastic programming and self optimizing control
    Journal of Environmental Management, 2015
    Co-Authors: Miguel Mauricioiglesias, Ane Loft Mollerup, Ignacio Monterocastro, Gürkan Sin
    Abstract:

    The design of Sewer system control is a complex task given the large size of the Sewer networks, the transient dynamics of the water flow and the stochastic nature of rainfall. This contribution presents a generic methodology for the design of a self-optimising controller in Sewer Systems. Such controller is aimed at keeping the system close to the optimal performance, thanks to an optimal selection of controlled variables. The definition of an optimal performance was carried out by a two-stage optimisation (stochastic and deterministic) to take into account both the overflow during the current rain event as well as the expected overflow given the probability of a future rain event. The methodology is successfully applied to design an optimising control strategy for a subcatchment area in Copenhagen. The results are promising and expected to contribute to the advance of the operation and control problem of Sewer Systems.

J G Langeveld - One of the best experts on this subject based on the ideXlab platform.

  • searching for storm water inflows in foul Sewers using fibre optic distributed temperature sensing
    Water Science and Technology, 2013
    Co-Authors: R P S Schilperoort, Cornelis De Haan, Holger Hoppe, J G Langeveld
    Abstract:

    A major drawback of separate Sewer Systems is the occurrence of illicit connections: unintended Sewer cross-connections that connect foul water outlets from residential or industrial premises to the storm water system and/or storm water outlets to the foul Sewer system. The amount of unwanted storm water in foul Sewer Systems can be significant, resulting in a number of detrimental effects on the performance of the wastewater system. Efficient removal of storm water inflows into foul Sewers requires knowledge of the exact locations of the inflows. This paper presents the use of distributed temperature sensing (DTS) monitoring data to localize illicit storm water inflows into foul Sewer Systems. Data results from two monitoring campaigns in foul Sewer Systems in the Netherlands and Germany are presented. For both areas a number of storm water inflow locations can be derived from the data. Storm water inflow can only be detected as long as the temperature of this inflow differs from the in-Sewer temperatures prior to the event. Also, the in-Sewer propagation of storm and wastewater can be monitored, enabling a detailed view on advection.

  • searching for storm water inflows in foul Sewers using fibre optic distributed temperature sensing
    9th International Conference on Urban Drainage Modelling Belgrade Serbia 4-6 September 2012, 2012
    Co-Authors: R P S Schilperoort, Cornelis De Haan, Holger Hoppe, J G Langeveld
    Abstract:

    A major drawback of separate Sewer Systems is the occurrence of illicit connections: unintended Sewer cross-connections that connect foul water outlets from residential or industrial premises to the storm water system and/or storm water outlets to the foul Sewer system. The amount of unwanted storm water in foul Sewer Systems can be significant resulting in a number of detrimental effects on the performance of the wastewater system. Efficient removal of storm water inflows into foul Sewers requires knowledge on the exact locations of the inflows. This paper presents a monitoring technique that can be used to localize illicit storm water inflows into foul Sewer Systems: Distributed Temperature Sensing (DTS). Data results from two monitoring campaigns in foul Sewer Systems in the Netherlands and Germany show the level of detail with which in-Sewer processes can be studied. Storm water inflow can be detected as long as the temperature of this inflow differs from the in-Sewer temperatures prior to the event. Also, the inSewer propagation of storm water can be monitored, enabling a detailed view on advection-dispersion and mixing processes.