TERRATEC has announced the successful deployment of its 3.85m Diameter Rock Slurry TBM on the Mumbai Sewer Disposal Project (MSDP) Stage-II – PST1. Executed by the J. Kumar-MEPL JV, the project is a significant stride in enhancing Mumbai’s sewage infrastructure, overseen by the Brihanmumbai Municipal Corporation (BMC).
TERRATEC has secured all machines for Mumbai’s sewerage segmental tunnels, providing two TBMs for the project (packages PST-1 & PST-2). These TBMs comprise a Rock Slurry TBM and a Rock EBPM, intended for the construction of the 5.8km Mumbai Priority Sewer Tunnel (PST-1) and the 4.7km Priority Sewer Tunnel (PST-2), respectively.
Commencing excavation after a successful Site Acceptance Test, The TERRATEC 3.85m Diameter Rock Slurry TBM operates under diverse geological conditions, including weathered/fresh breccia and basalt. Starting its excavation from the Malad Shaft S07 Pumping Station in the Creek area, the Rock Slurry TBM achieves a daily excavation rate of up to 14 rings when encountering fresh rock.
The Mumbai Sewer Disposal Project is pivotal for improving the quality and reliability of wastewater collection, treatment, and disposal processes. The endeavor minimizes the environmental impact associated with wastewater, emphasizing efficient and sustainable wastewater management for a healthier and enhanced environment for Mumbai’s residents.
The TERRATEC Rock Slurry TBM features a Slurry System controlling excavation face pressure, 23 number of 15” replaceable disc cutters, a high-speed main drive capable of eight revolutions per minute, and an active articulation system accommodating a minimum curve radius of 250mR. The TBM’s hydraulic main drive, due to size constraints, includes a shield integrated man lock.
The TERRATEC Rock Slurry TBM employs a 5+1 universal type segment design, featuring reinforced concrete segments that are 200mm thick and 1200mm wide. To efficiently manage slurry removal and treatment, the TERRATEC Slurry Transportation System and Slurry Treatment Plant are utilized.
The system utilizes a Centrifugal Slurry Pump for effective slurry removal, while the Slurry Treatment Plant incorporates advanced mud treatment technology and a remote-control maintenance system. This combination ensures not only efficient excavation over long distances but also cost-effectiveness throughout the process.
The MSDP – Stage II Priority Works project includes a sewer tunnel along Link Road, connecting Don Bosco Junction to the existing Malad Pumping Station. Another branch sewer tunnel connects from the Gorai Pumping Station, and a tunnel runs from the existing Malad Pumping Station to the proposed Malad IPS at Malad WwTF. This project involves constructing shafts and upstream connections to reduce wastewater flow into existing collector sewers and decommission pumping stations.
The comprehensive project expands sewage collection networks, constructs new pumping stations, establishes wastewater treatment facilities, and implements treated effluent disposal systems. These treatment plants are projected to recycle an impressive 2,464 million liters of sewage per day, reducing water pollution levels and rejuvenating Mumbai’s Mithi and Oshiwara rivers.