The DTSS concept uses deep tunnels to intercept the flows in existing sewers for conveyance by gravity to centralized Water Reclamation Plants (WRPs). The wet weather flows were subsequently increased to account for global climate change, which may results in an increase of storm intensities and I/I. 2017); the Southeast Collector in Toronto, Canada; the Thames Tideway Tunnel in London, England (Crawford et al. Air/water velocity ratios for ventilated sewers. DEEP TUNNEL SEWERAGE SYSTEM (DTSS - T09), PHASE 2. herrenknechtag Congratulations to Shanghai Tunnel Engineering Co. Pte Ltd, who recently completed a 3.8km long tunnel as part of the Singapore Deep Tunnel Sewerage System Phase 2. It comprises of a tunnel conveyance system of approximately 63km of Link Sewers of diameter 0.3-4m and 35km of tunnels of diameter 3-6m, adding resiliency to Phase 1 and adopting lessons learned, focusing on energy usage, operational efficiency and minimisation of land-take. Phase 2 of S$10B Deep Tunnel Sewerage System to Be Funded - Goody Feed In most near-surface sewers, the degree of communication is high, with many openings, particularly in combined systems. This cookie is set by GDPR Cookie Consent plugin. The new Tuas WRP and an advanced NEWater factory are the main elements of DTSS Phase II. Under the Deep Tunnel Sewerage System Phase 2 (DTSS2) Project, deep shaft excavations are carried out at numerous locations in the south and south-western part of Singapore. Phase 2 of DTSS will give a boost to our NEWater supply. In deep tunnels, however, the number of communication points with the atmosphere is reduced and attempts are frequently made at sealing the tunnel. Fact Sheet on Deep Tunnel Sewerage System Phase 2 & Integrated Waste Share this. For combined system storage tunnels, the main issue is the occasionally very large water inflows, which require the equal air outflow to be accommodated safely and without causing odours (Geogaki et al. DTSS Phase 2 comprises the following components: 40 kilometers of deep tunnels running largely under the Ayer Rajah Expressway, that will connect with the existing used water infrastructure to create one seamless and integrated system HERRENKNECHT Slurry TBM. The award of the tunneling contract to the Strabag team follows on the May 20 announcement that the province had awarded the tunneling contract for the Eglinton Crosstown West project to a team led by Aecon. Unlike rail or road tunnels, which can be easily accessed for inspection and maintenance, it is relatively difficult to access a sewer tunnel that is constantly conveying used-water. DTSS - Deep Tunnel Sewerage System | AcronymAttic It amounted to a total of S$3.4 billion. AECOM, together with its joint venture partner Black & Veatch, is the appointed professional engineering services consultant overseeing the development, engineering, and construction of DTSS Phase 2 which covers the Western and Southern parts of Singapore. Together with isolation roller gates, cross-connecting the DTSS 2 link sewers allows for flow bypass to perform tunnel maintenance or repairs, if ever needed, thereby preventing the potential discharge of untreated used-water, as well as the potential disruption to NEWater production. Construction on the McCook Reservoir Stage 2 is scheduled for completion in 2029. Other uncategorised cookies are those that are being analysed and have not been classified into a category as yet. 2009), physical modelling (Lyons et al. tijuana to san diego tunnel Project Details - pub singapore's national water agency The Deep Tunnel Sewerage System (DTSS) was conceptualised in the 1990s as a sustainable, cost-effective solution to meet Singapore's used water collection, treatment, reclamation and disposal needs in the long run. The latter is most important in storage tunnels. It started operating in 1993. Flow re-routing during segment isolation. DTSS Phase 2 (DTSS2) completes the DTSS by connecting the North Tunnel built under Phase 1 with a new South Tunnel and a new WRP at Tuas. The topics covered include hydraulic modelling of the entire system with the main goal of ensuring system resilience, air management to avoid odours at ground level, and isolation of tunnel section using gates for potential maintenance or repair. With Phase 1 of the project completed in 2008, Phase 2 will be delivered via a number of works packages to eventually complete 40km of deep tunnels and 60km of link sewers, along with associated hydraulic structures and air management facilities. These are part of a network of 40km of deep tunnels and 60km of link sewers for DTSS Phase 2. The ability of the vortex drop to replace the air jumpers was investigated. To meet Singapore's increasing water needs, PUB, Singapore's National Water Agency, designed a comprehensive Deep Tunnel Sewerage System (DTSS) that will meet 55% of Singapore's total water demand through reclamation of used water when complete. To maximize the potential synergies of the water-energy-waste nexus, the co-location of Tuas WRP and the Integrated Waste Management Facility (IWMF) marks Singapores first initiative to integrate used water and solid waste treatment processes. Keller was awarded subcontract work for rock fissure grouting under Ed Zublin AG for the Deep Tunnel Sewerage System Phase 2 project in Singapore. Model simulations were conducted with and without water in the tunnel section downstream of the gate. Operating the Tuas WRP Influent Pumping Station at a constant flow during dry weather was simulated. 2010; Plant et al. The same conditions as modelled with the CFD were simulated in the physical model and the results were close. The Zublin Link Sewer-S2 C2 project team has finished the connection between the DTSS link and the main sewer which was seen as a significant project milestone. Share on LinkedIn; Share on Facebook; . The governing equation for the air flow is: The above equation can be used to simulate the conditions of full ventilation (no head gradient along the sewer) by setting H/X = 0. Digging Deep in Singapore: Getting Ready for DTSS Phase II Their work will be part of a network of 40km of deep tunnels and 60km of link sewers for DTSS Phase 2. Hydraulic modelling enabled the development of feasible system operational regimes, in regards to the Tuas WRP Influent Pumping Station operation, flow controls and air flow management. Work starts on $6.5b deep underground tunnels to transport used water As no negative pressure was seen in the CFD analyses or measured in the physical model, the tunnel section after the steel lining will be lined with HDPE liner since the risk of HDPE delamination due to cavitation is small. For the DTSS project, population growth was taken into account by using population predictions for the year 2100, with sufficient flexibility to account for different possible geographical growth patterns. The hydraulic analyses undertaken during the feasibility study and preliminary design, assisted by the MIKE URBAN model of the entire system, provided critical inputs to decision-making for the development of an efficient and reliable DTSS2 design, which adds significant resilience to the overall DTSS. Validation of the 3 Water Reclamation Plants (3-WRP) concept (at Kranji, Changi and Tuas see Figure1). Examples include the Central Interceptor in Auckland, New Zealand (Grace et al. 2011), head-based modelling (Brocard et al. The drum hoist will first lift the gate to allow removal of the support beams. Phase 2 of the DTSS on the south-west side of the island comprises another planned network of deep level tunnels with another large treatment plant and outfall structure. Of particular importance was the specification of the influent flows to the system. A sample of the CFD model result is shown in Figure11. DTSS uses deep tunnels to convey used water by gravity to centralized water reclamation plants (WRPs) located at the coastal areas. Leighton Asia wins sewerage system project in Singapore 2015). Client: PUB, Singapores National Water Agency. This was the first rock fissure grouting in Singapore and was carried out with the help of our Global Product Team and prior experience in Malaysia. There. Singapore. Deep Tunnel Sewerage System, Singapore. The used water is then treated and further purified into ultra-clean, high-grade reclaimed water known as NEWater, with excess treated effluent discharged to the sea through an outfall. The good, bad and mixed on the DTSS - TunnelTalk The air pulling capacity of vortex drops has been studied in scale models conducted for other projects, from which an air to water flow ratio on the order of 1.5 was derived (Lyons & Odgaard 2010). Gate assembly at ground level via support beams. The simulation domain was discretized in a mesh of 2.3 million box-like cells 0.1 m on the side near the gate to 0.5 m farther in the tunnel. Immediately downstream of the gate stainless steel cladding will be used. In phase two, 40km of deep tunnels and 60km of link sewers will cover the western part of the island, as well as the downtown area. However, additional measures were found necessary to meet the system containment criteria set forth by Singapore National Water Agency, Public Utilities Board (PUB). When completed in 2025, Deep Tunnel Sewerage System (DTSS) Phase 2 will channel used water in the western parts of the island by gravity to a new water reclamation plant in Tuas. Diurnal flow variations were specified based on flow measurements in the system. Because of the variations in air flow requirements, two-speed fans are proposed, controlled by pressure measurements in the tunnels and link sewers. Tunnel isolation using roller gates and link sewer bypass loop. Once all the gate modules are assembled, the mobile crane will be used to place a drum hoist on top of the shaft. The resilience analyses concentrated on the system functionality in case of a failure, to ensure that used-water can be safely conveyed to a treatment plant. Metropolitan Water Reclamation District of Greater Chicago Leighton Asia delivers a full suite of engineering and construction services across the Asia region. 1998) and many more. Velocity measurements were made using Particle Image Velocimetry (PIV), a laser-based system. Hydraulic modelling was conducted using the MIKE URBAN collection system modelling software (DHI 2014). However, delays have affected the decision on which . It is scheduled for construction after 2015 - long after the current Phase 1 experiences have passed into the archive of Singapore's quite particular tunnelling history. The calculation methodology described earlier was used to develop an air management sytem for DTSS2. There are also three main focus areas for the DTSS Phase 2: Deep tunnel sewerage system, tunnel and link sewers, and Turas WRP. We also use third-party cookies that help us analyse and understand how you use this website. Resilience has been a goal of sewer system developers for a long time, resulting in systems that have operated satisfactorily for over a century in cities such as London and Paris. Air flow in sewers has been the subject of a number of studies including field measurements (Pescod & Price 1982; Witherspoon et al. Other planning objectives included cost optimization, energy and land-take minimization, ease of operation and maintainability. DTSS Home - PUB, Singapore's National Water Agency Breakthrough for DTSS - Phase 2 - Tunneling World In order to construct the Deep Tunnel Sewerage System Phase 2, Contract T-09, the 2nd TBM named Yuan Ching with a 7.56m diameter has excavated almost 60m beneath the ground on 15 January 2022. DTSS uses deep tunnels to convey used water by gravity to centralized water reclamation plants (WRPs) located at the coastal areas. Phase 1 of DTSS, which serves the eastern part of Singapore, was completed in 2008. The deep tunnels in Phase 2 will connect to the existing deep tunnels in Phase 1, which serve the northern and eastern part of Singapore to create one seamless integrated system. When completed in 2025 . The incoming used-water flow will be conveyed around the isolated section through near surface sewers built for this purpose see Figures5 and 6. The physical model covered the gate shaft and approximately 300 m of the downstream tunnel at a scale of 1 to 31.5. PDF Distinguished guests, Ladies and gentlemen, Deep Tunnel Sewerage System Phase 2 - AECOM The contract value is S$472.17 million. Nine synergies between the Tuas WRP and IWMF will maximize both energy and resource recovery. The subsequent contracts to build the rest of the deep tunnels and link sewers will be awarded from 2018. DTSS2 is the second phase of this project, comprising an approximately 30-km long South Tunnel, a 10-km long Industrial Tunnel, 60-km of Link Sewers and a new Water Reclamation Plant integrated with a NEWater facility. Deep tunnel sewerage system phase 2 - hydraulics Leighton Asia is delivering Contract T-09 of the Deep Tunnel Sewerage System Phase 2 Project, which includes design and construction of approximately 7.9km of used water tunnels, each with an internal diameter of six metres, as well as shafts, hydraulic structures and other facilities associated with the used water sewerage conveyance system. In this attenuated mode of operation, the South Tunnel would be used for storage, with its water level rising during the day and declining at night, as shown in Figure7. Deep Tunnel Sewerage System Phase 2 - Binnies Nine synergies between the Tuas WRP and IWMF will maximize both energy and resource recovery. The paper also presents several novel elements and the analyses that were conducted to develop and size them. 2016). Vortex drops naturally pull air and, if the air flow driven by the vortex is equal to or greater than the incoming air flow in the link sewers, air jumpers may not be necessary. To assess the wet weather contributions to tunnel flows, flow records at 11 pumping stations were analysed over a number of events. Provide input to the air management analyses. Wet weather flow analysis at sample pumping station. In this case, the air flow is constant with distance. Main Contractors: Kumagai. The measurements also identified a pressure drop downstream of the gate, but not to the point of having negative pressures. When completed, it will have a conveyance system that is made up of 60 km of link sewers and 40 km of deep tunnels. The different failure scenarios were simulated in the hydraulic model individually and in combination to identify the optimum suite of resilience measures. Air jumpers also have the benefit of providing flexibility relative to a fully passive approach relying on the air pulling capacity of the vortex. Full article: Geology along the Deep Tunnel Sewerage System Phase 2 The access manholes along the deep tunnels will largely be sealed but, over time, escape pathways may develop; and the link sewers upstream will offer more opportunities for air escape if pressure build-up occurs. As appropriate for open channel flow, the model was operated according to Froude scaling law. Client: Public Utilities Board Singapore Contracts: T03, T05, T06 and various link sewers. The Deep Tunnel Sewerage System Phase 2 T-11 include the design and construction of a 6km South Main Sewerage Tunnel, a 5.5km South Linkway Sewerage Tunnel, fifteen working shafts and related facilities. We focus on our core strengths by combining best practice in international project delivery with our extensive in-country local knowledge. This number is the overall used-water flow divided by the population; it therefore includes commercial and industrial contributions, as well as visitors and wet weather infiltration and inflow. Search for other works by this author on: Water Practice and Technology (2019) 14 (2): 409422. Singapore's water demand. These cookies track visitors across websites and collect information to provide customised ads. First batch of DTSS 2 contracts awarded - The Tunnelling Journal deep tunnel sewerage system phase 2, tuas water reclamation plant and integrated waste management facility to reap potential benefits from water-energy-waste nexus. Deep Tunnel Sewerage System - infrastructure.aecom.com To provide the required structural strength and facilitate deployment, stainless steel gates with guide wheels will be lowered into tracked guide channels. 2011); the North Dorchester Bay Tunnel in Boston, USA (Heath et al. Tunnel Boring Machine Launch Ceremony for Deep Tunnel Sewerage System That is more than 4,666 gallons for each person in its service area. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". And, based on a thorough review of Singapore as well as international data a per capita used-water contribution of 0.345 m3/capita/day was adopted, which is 15% above the 2013 rate. For larger events a gradual flow ramping up was tested in the hydraulic model and found to be satisfactory. These cookies ensure basic functionalities and security features of the website, anonymously. AECOM, together with its joint venture partner Black & Veatch, is the appointed professional engineering services consultant overseeing the development, engineering, and construction of DTSS Phase 2 which covers the Western and Southern parts of Singapore. The cornerstone of the WPAP - Milwaukee's Deep Tunnel System - involved 19.4 miles of Deep Tunnels dug 300 feet underground to help reduce sewer overflows and basement backups. Two 3.0m diameter slurry TBMs and three 3.3m diameter slurry TBMs. Necessary cookies are absolutely essential for the website to function properly. doi: https://doi.org/10.2166/wpt.2019.026. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. The co-location will also be the first facility of its kind in the world that was planned from the ground-up. This cookie is set by GDPR Cookie Consent plugin. The existing conventional WRPs at Ulu Pandan and Jurong, as well as intermediate pumping stations, will be progressively phased out and the land freed up for higher value development. The Deep Tunnel Sewerage System (DTSS) is aimed at providing a robust and efficient means of catering to Singapore's used-water needs. This would also require connecting the bottom of the vortex drop to the tunnel crown, to allow air passage at all times. Zblin AG. By continuing to use our website, you are agreeing to, Journal of Water, Sanitation & Hygiene for Development, Air flow in sanitary sewer conduits due to wastewater drag: a computational fluid dynamics approach, Sewer ventilation: factors affecting airflow and modeling approaches, Anticipating transient problems during the rapid filling of deep stormwater storage tunnel systems, A sewer ventilation model applying conservation of momentum, https://www.water-technology.net/projects/deep-tunnel-sewerage-system-dtss/, Republic Export Building,Units 1.04 & 1.05. This paper describes hydraulic analyses that were conducted during the feasibility study and preliminary design. Ed. Option 1 was ascertained to be most cost-effective, but tunnel isolation alone would not prevent system spillage and therefore, cross connections were added to the isolation capability (Option 2). strabag tunnelling Year 2060 dry weather flow maximum and minimum levels. In addition, the Tuas WRP will treat 800,000 cubic meters of used water per day, making it the largest membrane bioreactor facility in the world. The cookie is used to store the user consent for the cookies in the category "Analytics". A single gravity tunnel with isolation gates and additional tunnel and link sewer cross-connections optimizes system reliability and resilience from an operations perspective; and is the preferred system. 2018) and this was the case for DTSS. . Phase 2 consisting of networks of Link Sewers and Tunnels will extends the deep tunnels to serve the western part of Singapore. Emergency vents were included to cater to large wet weather events. Project PUB DTSS 2 T-11 | STECS ENSURING NEWATER SUSTAINABILITY Phase 2 of DTSS extends the existing deep tunnel system to collect used water from the western and southern parts of Singapore. Bringing international best practice and process to phase 2 of The subsequent contracts to build the rest of the deep tunnels and link sewers will be awarded from 2018. DTSS Phase 2 (DTSS2) comprises the South Tunnel which conveys domestic used water, the Industrial Tunnel for non-domestic used water, associated link sewers and the Tuas WRP. Spanning two phases over more than 20 years, Phase 1 was completed in 2008 while Phase 2 is due to be completed by 2025. For DTSS2, the head-based modelling approach was used (Brocard et al. The incoming air flows in the link sewers were estimated by assuming well-ventilated conditions, i.e. To maximize the potential synergies of the water-energy-waste nexus, the co-location of Tuas WRP and the Integrated Waste Management Facility (IWMF) marks Singapores first initiative to integrate used water and solid waste treatment processes. The DTSS Phase 2 project is making steady progress. The main objective then was the ability to cater to population growth. (Phase 1 and 2) criss-crossing Singapore with three large WRPs at the northern (Kranji), eastern (Changi) and . Implementation of the entire DTSS will result in 50% reduction in land taken up by used water infrastructure once it is fully completed, from 300 hectares in the 1990s to 150 hectares in the long terms, PUB: Consultant Safety Recognition Award, 2020. DTSS Phase 2 deep tunnels will be a showcase of cutting edge technologies and advanced smart sensors at work. The result can be expressed as: ASCE (American Society of Civil Engineers), Gravity Sanitary Sewer Design and Construction, Manuals and Reports on Engineering Practice No.60, Diagnosing Tunnel Hydraulic Behavior in San Francisco, Water Environment Federation, Collection System Conference, CIRIA (Construction Industry Research and Information Association), Design of Sewers to Control Sediment Problems, Major Infrastructure Resilience to Projected Changes to Population and Climate, Journal of Environmental Engineering and Science, Sewer Airflow Analysis: An Integral Part of Collection System Planning, Design, and Operation, London's CSO Control Improvements Programme Air Management Challenges, Auckland's Central Interceptor: Innovations From Planning Through Detailed Design, Elimination of CSO Discharges to South Boston Beaches: The MWRA North Dorchester Bay CSO Relocation Project, WEFTEC 98, Water Environment Federation, 1998, Watercare's Central Interceptor Wastewater Model Improving Accuracy by Including Seasonal Variations, Sewer Air Management in Vancouver's Kitsilano Area, Hydraulic Model Study for the City of Indianapolis Deep Rock Tunnel Connector Drop Structures, Iowa Institute of Hydraulic Research, University of Iowa, Odor Control Modeling in Sewage Drop Structures and Tunnels, Integrating Modelling for the Thames Tideway Tunnel, Water Environment Research Foundation (WERF), This site uses cookies. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. Pressure measurements were also conducted as there was a concern that the high velocities might be associated with low pressures that could pull the liner off the tunnel wall. Deep Tunnel Sewerage Phase 2 - Leighton Asia Deep tunnel sewerage system phase 2 - hydraulics Phase 1 of DTSS, which serves the eastern part of Singapore, was completed in 2008. Recently, global climate change has been another concern (Crawford et al. The existing conventional WRPs at Ulu Pandan and Jurong, as well as intermediate pumping stations, will be progressively phased out and the land freed up for higher value development. . Project Details - pub singapore's national water agency Tunnel Engineer. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. Deep tunnel sewerage system phase 2 - hydraulics DTSS2 is the second phase of this project, comprising an approximately 30-km long South Tunnel, a 10-km long Industrial Tunnel, 60-km of Link Sewers and a new Water Reclamation Plant. In total, 13 AJs and four OCFs were identified for the DTSS2 tunnel and link sewer network.
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