A Case Study on Sewage Treatment Plant Kamothe, Panvel

Abstract

Rapid urbanization in the Navi Mumbai Panvel region, fuelled by CIDCO-led township development, the upcoming Navi Mumbai International Airport, and large-scale residential growth in nodes such as Kamothe, Kharghar and Kalamboli, has placed sustained pressure on local sewerage infrastructure. This paper presents a case study of the Sewage Treatment Plant (STP) located at Kamothe under the jurisdiction of the Panvel Municipal Corporation (PMC) and the City and Industrial Development Corporation of Maharashtra (CIDCO). The Kamothe STP, situated at approximately 19°0?48.62?N, 73°5?13.02?E, has an installed treatment capacity of 85 Million Litres per Day (MLD) and forms part of a wider network of treatment facilities serving the Panvel Municipal Corporation area, including plants at Kharghar (70 MLD), Kalamboli (50 MLD), Taloja (32 MLD), Bandar Road (14 MLD) and Kalundre (2 MLD). The study reviews the unit processes typically employed at such plants screening, grit removal, primary sedimentation, biological treatment through the Sequencing Batch Reactor (SBR) process, and chlorination/disinfection prior to discharge or reuse and examines the operational, regulatory and socio-environmental context in which the plant functions. Secondary data drawn from municipal and government sources, including the PMC Environmental Status Report and CIDCO tender and budgetary documents, is used to assess capacity utilisation, treatment technology, compliance with Central Pollution Control Board (CPCB) norms, and the scope for treated-water reuse. The paper concludes that while the SBR-based approach adopted at Kamothe offers a compact, automation-friendly solution suited to land-constrained urban nodes, sustained capacity augmentation, sludge management planning, and expansion of treated-water reuse will be necessary to keep pace with the projected population and infrastructural growth of the Panvel region.

Introduction

Sewage is composed of about 99.9% water and 0.1% solids, mainly organic waste from domestic, commercial, and institutional sources. If discharged untreated, it pollutes water bodies, depletes dissolved oxygen, harms aquatic life, produces foul odors, and spreads waterborne diseases. Therefore, sewage treatment is essential for protecting public health and the environment.

The Panvel Municipal Corporation (PMC) area, particularly Kamothe, has experienced rapid urbanization due to CIDCO's planned development, improved transportation, and the upcoming Navi Mumbai International Airport. As the population has increased, wastewater generation has also risen, making efficient sewage treatment a critical requirement. Wastewater from Kamothe is collected through an underground sewer network and treated at the Kamothe Sewage Treatment Plant (STP) before discharge or reuse for non-potable purposes such as gardening and toilet flushing.

The case study aims to:

• Examine the design, capacity, and treatment technology of the Kamothe STP.
• Understand its role within PMC's sewerage network.
• Review compliance with CPCB and MPCB standards.
• Identify operational challenges and opportunities, particularly capacity expansion and treated water reuse.

Literature Review

Previous studies show that properly designed sewage treatment plants effectively reduce pollution and protect water resources. Research highlights the advantages of the Sequencing Batch Reactor (SBR) process, including:

• High removal efficiency of BOD, COD, suspended solids, and pathogens.
• Smaller land requirement compared to conventional treatment systems.
• Suitability for rapidly urbanizing areas despite higher energy and operational costs.
• Potential for reuse of treated wastewater for irrigation, groundwater recharge, landscaping, and flushing.

Study Area

Panvel, located in Raigad district, Maharashtra, covers about 110 km² and has experienced significant population growth. The region receives 2,500–3,000 mm of annual rainfall, which increases sewer flows during the monsoon due to stormwater infiltration. Kamothe is a densely populated residential and commercial node where efficient wastewater management is essential.

Kamothe Sewage Treatment Plant

• Installed capacity: 85 MLD (Million Litres per Day), the largest STP in PMC.
• Owned by CIDCO and operated through comprehensive Operation & Maintenance contracts.
• PMC has proposed an additional 15 MLD STP to meet future demand.
• Kamothe contributes about one-third of PMC's total sewage treatment capacity (253 MLD).

Treatment Process

The plant primarily uses the Sequencing Batch Reactor (SBR) process, involving:

1. Screening of large debris.
2. Grit removal.
3. Equalization/primary treatment.
4. Biological treatment through fill, aeration, settling, and decanting.
5. Chlorination for disinfection.
6. Sludge thickening and dewatering.

Regulatory Framework

The plant operates under CPCB and MPCB standards, monitoring parameters such as:

• Biochemical Oxygen Demand (BOD)
• Chemical Oxygen Demand (COD)
• Total Suspended Solids (TSS)
• pH
• Faecal coliforms

PMC has received Water+ certification and environmental awards, reflecting its commitment to sanitation and water quality.

Results and Discussion

The study concludes that:

• The current 85 MLD capacity is nearing its limit due to rapid urban growth.
• The SBR process is well suited to Kamothe because of its compact design and high treatment efficiency, despite higher operating costs.
• Effective operation depends on strong maintenance contracts and continuous performance monitoring.
• Heavy monsoon rainfall increases hydraulic loading, highlighting the need for better stormwater management.
• Expanding treated wastewater reuse for landscaping, flushing, construction, and other non-potable purposes can reduce dependence on freshwater resources and improve sustainable water management.

Conclusion

This case study has examined the Kamothe Sewage Treatment Plant within the wider sewerage infrastructure context of the Panvel Municipal Corporation area. The 85 MLD Kamothe facility is the largest of six STPs identified within the PMC jurisdiction and employs the Sequencing Batch Reactor process, an approach well suited to land-constrained, rapidly urbanising nodes because of its compact footprint and amenability to automated, PLC-controlled operation. Drawing on documented PMC and CIDCO sources, the study finds that the existing plant capacity, while substantial, is already being supplemented through new budgetary allocations for an additional 15 MLD facility and a separate plant serving Sectors 19–21 — a clear institutional signal that sewage generation in the Kamothe node is outpacing the original design capacity of the existing infrastructure. The study further highlights three areas warranting continued attention from planners and engineers: first, the need for sustained capacity augmentation that anticipates, rather than merely reacts to, population and commercial growth; second, the importance of rigorous O&M contract monitoring to ensure that contracted private-sector operation reliably delivers CPCB-compliant effluent quality; and third, the substantial untapped potential for treated-water reuse, following precedents already established elsewhere in Navi Mumbai, to ease pressure on the region\'s freshwater supply sources. Addressing these areas would strengthen the long-term sustainability of sewage management in Kamothe and offer a transferable model for similar CIDCO-developed nodes across the Mumbai Metropolitan Region.

References

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Copyright

Copyright © 2026 Sanskruti Divte, Saurabh Gadade, Sonali Gawande, Krushna Belge. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.